Well after a lazy start to a rainy morning, I was about to get up. However another coffee and staying in bed watching another Stefan video seems like a good idea. I love retirement.
Me too, just made my morning coffee and went back to bed to drink it and saw a new Stefan was up, my day can properly start later. Being fully retired now my life consists of youtube and shopping for food to feed my badgers,😂
I used to make those for my scanning tunneling microscope in the 80's . That wire is a complete pita to mess with. I used electro etching in sodium hydroxide (drano) to make them atomically sharp.
@@mackenziehaines1976 would it be rotating the whole time then? And wouldn’t the surface tension of the acid make it cling to the rotating needle as it comes out, ruining the sharpening effect?
@@cwmd7651 I had a circular graphite electrode at the top of the container and the meniscus of the sodium hydroxide touched it. The needle was placed in the center. It etched a concave profile into the wire until the submerged part fell off. The end was atomically sharp.
This makes you fully realise the mad machining skills of Doc Brown in his wooden barn. No wonder it took him 30yrs from conception of the idea to the finished product.
Stephen you come up against some of the weirdest problems and then come up some pretty interesting solutions. Its an honor to watch your genius at work. In one word"SURGICAL".
I made something very similar but it was in inconel and had a flat on the cone portion. It was 2mm diameter, so a lot easier. The client acted like it was some hassle to get them made but other than finding the stock it was just another day in the shop. I like reading the old shop books and machinist manuals for the tips and tricks. It’s surprising how technically adept they were in the early 1900’s even. I had guessed you’d heat it, but the stretching and twisting in the lathe was a nice surprise and very clever.
the best books are the old books... if its about engineering in any shape or form... i GRAB it. then read it cover to cover. then add to the collection in the toilet. can open them anywhere and have a good read for a few minutes... THEN try to put some of those ideas into practice. that doesnt always work out so well. lol. but yeah, other than a few channels... youtube is a depressing place of stupidity and ignorance, perpetuating itself. always learn something from THIS guys videos :)
I can't imagine when I might ever have a need to straighten and/or sharpen a coil of thin tungsten wire, but now I know the proper processes to do so. Always learning something neat and obscure on YT. Thanks Stefan. 🙂
Very similar in size and shape to the electrodes in a fiber optic fusion splicer. They run at about 20 milliamps to melt the glass fibers together. Now I know how to make replacements for my ancient fusion splicer if I ever need to.
The Micro Fine Sanding Film that I have was made by Albion Alloys Precision Abrasives of Canada. I learned about it on a clock repair course. You can buy sample packs with up to 60000 grit easily in the UK hope that helps viewers source some for themselves 😀
Decades ago I had to make tungsten filaments which were essentially like little coil springs the wire size was very similar to what you have and I did it by putting current through the wire and wrapping it around a mandrel the mandrel of course was connected to 1 pole of the electrical source I used a very high current transformer that was only a few volts. I was able to essentially bend the wire red hot and it went very easily and worked very well. The today to get a transformer that would do that you could start with a microwave oven transformer hacksaw out all the high voltage windings and put a couple turns of very heavy gage wire in as a as a low voltage secondary that could produce substantial current probably more than enough to heat your tungsten wire. Another possibility for a high current transformer would be a spot welder or possibly even a weller soldering gun depends on how much power you need. Interesting job great video as usual thanks
Stefan, thanks for taking the shortest route possible in the process while explaining the orders of operation and getting to the POINT promptly. LOL Could not resist. Cheers from the U.S.!
Thank you Stefan, interesting and instructional, a good lesson today. It is very weird stuff, and I expect it is very hard as well. Fascinating insight into bespoke machining and small shop production for what must be some very niche technologies.
You can also make a point on the wire using a solution of KOH in water and passing electricity through it (using a separate W electrode as a counter electrode)
Yup, tungsten electrodes have a long history of use in neuroscience so there are standard protocols for making lots of these kinds of sharp needles. Here is an example paper: www.ncbi.nlm.nih.gov/pmc/articles/PMC4927710/
The super finishing film is also used in woodworking for sharpening. I get mine in sheets of various micron sizes from Dictum in Germany or Wood Workers Workshop in the UK
I used to manage processes in a tool steel wire drawing/rolling shop that worked with austenitic alloy steels for cutting edges. One tungsten/cobalt/moly grade had 1.3%C (HS10-4-3-10?) which caused all kinds of problems. When we tried to put too much work into the wire, we'd get those longitudinal cracks, I think because pulling larger wire through a smaller hole without heat creates longitudinal tensile stresses in the core balanced by compressive stresses around the circumference - usually you'd get a point tensile fracture in the dead centre, but other times the stresses from the cast (where you laterally offset the die from the capstan that pulls the wire to put that curve you show at 3:40 so it sits nicely on the spool without tangling, a bit like curling paper ribbons over the edge of a scissor-blade) make the stress fracture run along the length of the wire with a characteristic step. I wonder if that's what you're seeing. Looks like tungsten is drawn with heat (it's only ductile above room temp), and perhaps the stresses are set into the metal, at least making it brittle fracture predictably. I imagine the twist you put in allows the residual cast stresses to distribute around the wire (maybe it has a very slight spiral?). We used to make some wire for ICE injector needles, straight wire could be the biggest challenge!
Hi Stefan, at the tip-polishign step, 21:44 , the velocity of the tip (against the polishing stick) is zero. The wear-rate of the tip too is near-zero, as evident from the "residue" left on the polisher. Would it be worthwhile, instead to have e.g. a Dremel-wheel (polisher with paste) with its axis orthogonal to the lathe-axis, and with some offset, of course.. Would this allow a tip-radius finer than the ~5-10um as you show?
Sharp thinking, great result! There are straight pre cut annealed stress relived pieces of thin W wire available in similar dimensions. If the application is not very high temp perhaps tougher alloyed material that is machinable could be used. I have used W alloys for small high density weights in micro mechanical applications, was fairly easy to machine,
I found superfine Teflon lapping film in a scalemodeling shop, that goes up to 60.000 grit, i use it for polishing titanium parts giving it a mirror finish
Thanks for the video. The wire straighting bit will come in handy for me in a few weeks as I have to straighten some tantalum wire. I'm not sure how it's going to behave yet but your technics will certainly be tried. Awesome vid once again for us machining nerd folks.
That looked quite difficult, lot of steps to go through. I imagine a very steep learning curve and not exactly cheap to 'play' with I'm glad I don't make tiny parts like that from 'exotic' materials Good video showing how it's done
Today in making acupuncture needles for wolverine! Interesting subject Stefan. Definitely will store these techniques in the back of the brain if the need arrises. I have a feeling the method would work even with other types of wire.
A few years back I wondered how they wind Tungsten filaments. IIRC the trick discovered way back was to alloy the Tungsten with Sodium to make it malleable. Then once coiled it was heated to evaporate off the Sodium. What was not clear is how you alloy Tungsten and Sodium. My guess was to dissolve powdered Tungsten into the Sodium melt.
You can get very fine diamond paste but the grit tends to tear rather than polish. You may want to try something like Cerium oxide even though the the grit is lower it may end up giving you a finer finish. The tungsten reminds me of the problems I have had with diamond paste on old 1800's steel. Without regard to how fine the mesh it just tears the old steels rather then smoothing them. and then again I could be completely wrong. :) .... Things I learned restoring old straight razors.
Years ago I used to atomically sharpen tungsten wire to make probes for manipulating single crystals in chemical microscopy. We made a bolus of sodium nitrate in a test tube, then broke the test tube and mounted the sodium nitrate on a cork. The wire was heated white hot with a torch, then drawn across the sodium nitrate as many times as needed to make it sharp.
If I did this process of straightening tungsten wire a lot I would probably run a high current of electricity through it instead of using the flame. Interesting problems with interesting solutions! Cheers!
Thanks for another great video. I learn something new each time. There is an old-school jewellers' method of straightening wire. It might work on Tungsten. Bang a row of nails into a board in a straight line, with short distances between them - I would guess 15-20mm for wire that thin. Thread the beginning of the spool left-right-left-right through the nails, then grasp the free end in a wire-pulling pliers (or use a wire pulling bench) and pull the rest through. Amazingly, being pulled through such a "slalom" actually straightens the wire, as the bends tend to cancel each other out. Might be worth a try if you have too much wire and some nails. The reference for this technique can be found in "Metalwork and Enamelling", by Herbert Maryon, who was once curator of jewellery at the British Museum.
This only works if the wire is ductile. The ductile-brittle transition temperature (DBTT) of tungsten is usually above room temperature, typically around 200°C. Below that temperature it will simply crack and split like Stefan demonstrated in the beginning. EDIT: If you can somehow keep the whole setup above the DBTT, then it could be a good option if large quantities of wire need to be straightened.
Interesting solution to the straightening. I think your way was nice and controlled, but you could have used your TIG welder and foot pedal to introduce the current to heat it as one. Downside would have been a more complex electrical connection with potential issues of damage to your lathe bearings from arcing.
not long ago at work I made a Tungsten Beamstop for an X-Ray beam. to keep a low profile it was very thin walled, it randomly broke mid machining twice. The cracks went completely arbitary, not related to either clamping direction, nor any way of working direction. it is indeed a difficult material to work with
Tungsten: yes weird stuff .I built a helix winding machine (for TWTs) keeping the wire from fracturing was a major problem even with annealed wire. BTW is the Rapunzel look a wall climbing aid ?
What would be a great video would be you sharpening a TIG welding electrode with this method and compare the arc shape versus a "normal" method of sharpening an electrode. To see if the arc shape and density is greatly affected.
Lapping film can also used for sharpening woodworking tools. I have purchased adhesive backed sheets from Dieter Schmidt Fine Tools in Germany, and from Workshop Heaven in the UK. I prefer the 3M film.
Fascinating as always. Can you share the manufacture's name and part number for the polishing wood? I can understand that non-disclosure agreements may prevent this.
Nice and instructive job as usual. As a chemist I know that tungstene is prone to oxydisation (it begins at about 600 °C). So using a reducing flame should be better to decrease the amount of scales?. Thanks a lot for showing this stunning part of a flux capacitor👍🖖👌
Stefan is that damn flux capacitor ever gonna be finished.😂😂😂😂 Seriously I don’t think you have posted a video I have seen that I don’t learn from. Don’t stop
Hello Stefan, interesting to see how you straightened the tungsten wire. Although not knowing the application, you might want to consider grinding/polishing axial (along the tungsten rod) instead of along its circumference. I wouldn't be surprised, if your customer will ask for that :) Greetings from Badsichen, Stefan.
One does not simply watch a few minutes and save the rest for lunch break. Thanks Bud, there goes my morning productivity.
Well after a lazy start to a rainy morning, I was about to get up. However another coffee and staying in bed watching another Stefan video seems like a good idea. I love retirement.
Lucky bugger. I am supposed to be retired as well but all I can't get past the tired bit. 😌
Me too 73 and still at it
@@Agnemons To be honest I'm still doing odds and sods and getting into my workshop.
Retirement is a great thing
Me too, just made my morning coffee and went back to bed to drink it and saw a new Stefan was up, my day can properly start later. Being fully retired now my life consists of youtube and shopping for food to feed my badgers,😂
I used to make those for my scanning tunneling microscope in the 80's . That wire is a complete pita to mess with. I used electro etching in sodium hydroxide (drano) to make them atomically sharp.
How did your electro etching setup make them sharp? Wouldn’t it etch everything evenly?
@@cwmd7651not if you dip the part in at the angle needed to erode the tip sharp
@@mackenziehaines1976 would it be rotating the whole time then? And wouldn’t the surface tension of the acid make it cling to the rotating needle as it comes out, ruining the sharpening effect?
@@cwmd7651 I had a circular graphite electrode at the top of the container and the meniscus of the sodium hydroxide touched it. The needle was placed in the center. It etched a concave profile into the wire until the submerged part fell off. The end was atomically sharp.
@@chopper3lw oh interesting, to be clear, the meniscus was creating the curved profile in the needle? That’s so cool!
This makes you fully realise the mad machining skills of Doc Brown in his wooden barn. No wonder it took him 30yrs from conception of the idea to the finished product.
The superfinishing paper I get from Otto Frei and Gesswein here in the U.S.. Wonderful abrasives!
Now I know how to repair a hair follicle on a bees knee, thank you Stefan. Awesome camera work thank you for the extra extra effort.
Thank you for re-writing the 1939 paper on how to straighten tungsten wire!
It’s always a pleasure to watch you solve rarer problems, whether it be odd features, strange materials, or both.
Stephen you come up against some of the weirdest problems and then come up some pretty interesting solutions. Its an honor to watch your genius at work. In one word"SURGICAL".
Everthing gets weird when youre small.
Dont as me how I know.. >_>
I made something very similar but it was in inconel and had a flat on the cone portion. It was 2mm diameter, so a lot easier. The client acted like it was some hassle to get them made but other than finding the stock it was just another day in the shop. I like reading the old shop books and machinist manuals for the tips and tricks. It’s surprising how technically adept they were in the early 1900’s even. I had guessed you’d heat it, but the stretching and twisting in the lathe was a nice surprise and very clever.
the best books are the old books... if its about engineering in any shape or form... i GRAB it. then read it cover to cover. then add to the collection in the toilet. can open them anywhere and have a good read for a few minutes...
THEN try to put some of those ideas into practice. that doesnt always work out so well. lol.
but yeah, other than a few channels... youtube is a depressing place of stupidity and ignorance, perpetuating itself.
always learn something from THIS guys videos :)
I can't imagine when I might ever have a need to straighten and/or sharpen a coil of thin tungsten wire, but now I know the proper processes to do so. Always learning something neat and obscure on YT. Thanks Stefan. 🙂
Cousins UK, a watchmaking supply store, sells 3M micro-finishing film in A4 sheets of all different grits.
Real nice macro filming on this one. I bet the camera work was nearly as difficult as the job itself. Well done.
"with pin point accuracy" 👍
Too many channels waffle on. I like how Stefan keeps to the point.
Very similar in size and shape to the electrodes in a fiber optic fusion splicer. They run at about 20 milliamps to melt the glass fibers together. Now I know how to make replacements for my ancient fusion splicer if I ever need to.
That hair is getting to look fabulous
Geiger-Müller tubes are also used in UV Flame detection sensors/instruments for large furnaces in power plants etc.
The Micro Fine Sanding Film that I have was made by Albion Alloys Precision Abrasives of Canada. I learned about it on a clock repair course. You can buy sample packs with up to 60000 grit easily in the UK hope that helps viewers source some for themselves 😀
Thanks for the info, useful.
Cool technique for straightening that wire, old school magic👍👌🇦🇺
Decades ago I had to make tungsten filaments which were essentially like little coil springs the wire size was very similar to what you have and I did it by putting current through the wire and wrapping it around a mandrel the mandrel of course was connected to 1 pole of the electrical source I used a very high current transformer that was only a few volts. I was able to essentially bend the wire red hot and it went very easily and worked very well. The today to get a transformer that would do that you could start with a microwave oven transformer hacksaw out all the high voltage windings and put a couple turns of very heavy gage wire in as a as a low voltage secondary that could produce substantial current probably more than enough to heat your tungsten wire. Another possibility for a high current transformer would be a spot welder or possibly even a weller soldering gun depends on how much power you need. Interesting job great video as usual thanks
What a glorious mane, and a lovely way to start the week.
Stefan, thanks for taking the shortest route possible in the process while explaining the orders of operation and getting to the POINT promptly. LOL Could not resist. Cheers from the U.S.!
Thank you Stefan, interesting and instructional, a good lesson today. It is very weird stuff, and I expect it is very hard as well. Fascinating insight into bespoke machining and small shop production for what must be some very niche technologies.
You can also make a point on the wire using a solution of KOH in water and passing electricity through it (using a separate W electrode as a counter electrode)
Yup, tungsten electrodes have a long history of use in neuroscience so there are standard protocols for making lots of these kinds of sharp needles. Here is an example paper: www.ncbi.nlm.nih.gov/pmc/articles/PMC4927710/
I am always impressed with your dedication to perfection in everything that you do. I always enjoy your videos. Keep them coming.
Really enjoying watching your problem solving.
Wonderful to watch you at work as always Stefan.
That was probably more fun to watch than it was to make them. Thanks for sharing! Hope all is well there. - TZ
very good job stefan..thanks for your time
Such fine work! 👍The heat treating process was very novel.
you are an extremely patient man. nice job!
The super finishing film is also used in woodworking for sharpening. I get mine in sheets of various micron sizes from Dictum in Germany or Wood Workers Workshop in the UK
Your ingenuity is inspiring. Thank you for sharing this.
Beautiful close-up shots. Your camera work just keeps getting better!
It's like it's Wolfram!
The chemical symbol for tungsten is W. Guess where that came from. ;)
I used to manage processes in a tool steel wire drawing/rolling shop that worked with austenitic alloy steels for cutting edges. One tungsten/cobalt/moly grade had 1.3%C (HS10-4-3-10?) which caused all kinds of problems. When we tried to put too much work into the wire, we'd get those longitudinal cracks, I think because pulling larger wire through a smaller hole without heat creates longitudinal tensile stresses in the core balanced by compressive stresses around the circumference - usually you'd get a point tensile fracture in the dead centre, but other times the stresses from the cast (where you laterally offset the die from the capstan that pulls the wire to put that curve you show at 3:40 so it sits nicely on the spool without tangling, a bit like curling paper ribbons over the edge of a scissor-blade) make the stress fracture run along the length of the wire with a characteristic step. I wonder if that's what you're seeing. Looks like tungsten is drawn with heat (it's only ductile above room temp), and perhaps the stresses are set into the metal, at least making it brittle fracture predictably. I imagine the twist you put in allows the residual cast stresses to distribute around the wire (maybe it has a very slight spiral?). We used to make some wire for ICE injector needles, straight wire could be the biggest challenge!
Fascinating. Thanks for sharing!
Now I know how they made my air brush needles , thanks Stefan
Good stuff Stefan!
ATB, Robin
Very interesting process. Thanks
Thanks Stefan, straight to the point, helps a lot!
Next week he puts a thread on the other end and drills a hole down the centre. :)
I’ll watch that!
And than a thread in the hole
Excellent Stefan . Thanks 🇬🇧
More masterful machining. Take care Stefan. Mike in Canada
The secret mission to produce TIG welding tips for the mice?
ants - tig welding tips for ants - more realistically, the look like probe tips for wafer probing in semiconductor testing / manufacturing
Hi Stefan, at the tip-polishign step, 21:44 , the velocity of the tip (against the polishing stick) is zero. The wear-rate of the tip too is near-zero, as evident from the "residue" left on the polisher. Would it be worthwhile, instead to have e.g. a Dremel-wheel (polisher with paste) with its axis orthogonal to the lathe-axis, and with some offset, of course.. Would this allow a tip-radius finer than the ~5-10um as you show?
Absolutely brilliant work! It initially acted as if it was case hardened.
That's amazing Stefan. Thank you
It took me only, like 10 years to figure out Flux capacitor story. Smart, very, very smart.
great video and excellent filming with different angles - using a pin vise greatly adds to the process during grinding
Very interesting Stefan.Thank you.
Your work is always fascinating.
A lot of new stuff, many thanks for sharing.
And quite stressful too, when you were twisting that thing on the lathe.....
cheers
thanos
I was affraid for you just watching. So sharp!
Very interesting, educational and entertaining, thanks for sharing your work.
Sharp thinking, great result!
There are straight pre cut annealed stress relived pieces of thin W wire available in similar dimensions.
If the application is not very high temp perhaps tougher alloyed material that is machinable could be used.
I have used W alloys for small high density weights in micro mechanical applications, was fairly easy to machine,
I don't always use my tailstock, but when I do, its for straightening tungsten wire with a torch!
I found superfine Teflon lapping film in a scalemodeling shop, that goes up to 60.000 grit, i use it for polishing titanium parts giving it a mirror finish
Thanks for the video. The wire straighting bit will come in handy for me in a few weeks as I have to straighten some tantalum wire. I'm not sure how it's going to behave yet but your technics will certainly be tried. Awesome vid once again for us machining nerd folks.
That looked quite difficult, lot of steps to go through.
I imagine a very steep learning curve and not exactly cheap to 'play' with
I'm glad I don't make tiny parts like that from 'exotic' materials
Good video showing how it's done
Very creative. Excellent thanks.
Gotta love those flux capacitors.
Today in making acupuncture needles for wolverine! Interesting subject Stefan. Definitely will store these techniques in the back of the brain if the need arrises. I have a feeling the method would work even with other types of wire.
These needles look exactly like the ones used for the Lampert PUK welder we used in jewellery school!
Excellent work!
Amazing work yet again Stefan!
that flux capacitor is going to run really smooth with those needles!
ahhh... you are making
"Needle Bearings" !!
~grin
The coolest element name of all. I found that cutting it on a drill press was very similar to cast iron.
A few years back I wondered how they wind Tungsten filaments. IIRC the trick discovered way back was to alloy the Tungsten with Sodium to make it malleable. Then once coiled it was heated to evaporate off the Sodium. What was not clear is how you alloy Tungsten and Sodium. My guess was to dissolve powdered Tungsten into the Sodium melt.
Always entertaining AND educational. 👍
Nice job.
You can get very fine diamond paste but the grit tends to tear rather than polish. You may want to try something like Cerium oxide even though the the grit is lower it may end up giving you a finer finish. The tungsten reminds me of the problems I have had with diamond paste on old 1800's steel. Without regard to how fine the mesh it just tears the old steels rather then smoothing them. and then again I could be completely wrong. :) .... Things I learned restoring old straight razors.
Years ago I used to atomically sharpen tungsten wire to make probes for manipulating single crystals in chemical microscopy. We made a bolus of sodium nitrate in a test tube, then broke the test tube and mounted the sodium nitrate on a cork. The wire was heated white hot with a torch, then drawn across the sodium nitrate as many times as needed to make it sharp.
If I did this process of straightening tungsten wire a lot I would probably run a high current of electricity through it instead of using the flame. Interesting problems with interesting solutions! Cheers!
Thanks for another great video. I learn something new each time.
There is an old-school jewellers' method of straightening wire. It might work on Tungsten.
Bang a row of nails into a board in a straight line, with short distances between them - I would guess 15-20mm for wire that thin. Thread the beginning of the spool left-right-left-right through the nails, then grasp the free end in a wire-pulling pliers (or use a wire pulling bench) and pull the rest through. Amazingly, being pulled through such a "slalom" actually straightens the wire, as the bends tend to cancel each other out.
Might be worth a try if you have too much wire and some nails.
The reference for this technique can be found in "Metalwork and Enamelling", by Herbert Maryon, who was once curator of jewellery at the British Museum.
That process works on electrical wire as well.
This only works if the wire is ductile. The ductile-brittle transition temperature (DBTT) of tungsten is usually above room temperature, typically around 200°C. Below that temperature it will simply crack and split like Stefan demonstrated in the beginning.
EDIT: If you can somehow keep the whole setup above the DBTT, then it could be a good option if large quantities of wire need to be straightened.
Interesting solution to the straightening. I think your way was nice and controlled, but you could have used your TIG welder and foot pedal to introduce the current to heat it as one. Downside would have been a more complex electrical connection with potential issues of damage to your lathe bearings from arcing.
With a grind that fine it might actually be a nice Tig electrode even with the radial grinding direction. Very nice
not long ago at work I made a Tungsten Beamstop for an X-Ray beam. to keep a low profile it was very thin walled, it randomly broke mid machining twice. The cracks went completely arbitary, not related to either clamping direction, nor any way of working direction. it is indeed a difficult material to work with
I don't know when I'll need to straighten tungsten, so I was reluctant to click on the video, but gahhhhhh I also can't stop watching.....
Nice problem solving skills!
was very interrested in the red box on the table in the first shot. was kinda hopeing we would get to see and hear about it as well in the video
It was literally the pincushion for the parts he made.
@@raualjohnson1739 i ment the red measureing box behind
The red box is a Mahr millitron or Mahr Feinprüfgerät an electronic micrometer
@@joehoandroid thanks. was woundering exactly what it's name
In the past I have used a welder as a high current power supply where I needed around 40A.
Great video, thank you. I wonder though, how do they coil the wire in the first place?
Tungsten: yes weird stuff .I built a helix winding machine (for TWTs) keeping the wire from fracturing was a major problem even with annealed wire. BTW is the Rapunzel look a wall climbing aid ?
What would be a great video would be you sharpening a TIG welding electrode with this method and compare the arc shape versus a "normal" method of sharpening an electrode. To see if the arc shape and density is greatly affected.
One simply does not have the memes right on point....well within a few microns. Excellent video, as always.
Genius......................Cheers, Davo Australia
Lapping film can also used for sharpening woodworking tools. I have purchased adhesive backed sheets from Dieter Schmidt Fine Tools in Germany, and from Workshop Heaven in the UK. I prefer the 3M film.
Ahhh... the air hose holder finds a new role in life. 😉
Interesting. Nice video
Fascinating as always. Can you share the manufacture's name and part number for the polishing wood? I can understand that non-disclosure agreements may prevent this.
😉
What a glorious head of hair!
Gut gemacht 🙌
yeah buddy! hair's lookin fabulous
That was great!
For the polishing film in the USA or Canada try Goodson. They supply abrasives to engine builders
Nice and instructive job as usual. As a chemist I know that tungstene is prone to oxydisation (it begins at about 600 °C). So using a reducing flame should be better to decrease the amount of scales?.
Thanks a lot for showing this stunning part of a flux capacitor👍🖖👌
Stefan is that damn flux capacitor ever gonna be finished.😂😂😂😂
Seriously I don’t think you have posted a video I have seen that I don’t learn from. Don’t stop
It's an older meme, sir. But it checks out
Did you say i am old? 😁
Kids these days don't understand what the internet was like back then.
If the Delorean fits...
Hello Stefan, interesting to see how you straightened the tungsten wire. Although not knowing the application, you might want to consider grinding/polishing axial (along the tungsten rod) instead of along its circumference. I wouldn't be surprised, if your customer will ask for that :) Greetings from Badsichen, Stefan.