How to hand scrape metal for flatness
ฝัง
- เผยแพร่เมื่อ 22 พ.ย. 2018
- How to scrape metal with hand tools is a skill all machinist need to learn. In this video I give a step by step process to the art of scraping
Tee Spring teespring.com/stores/build-so...
Email .............. Dale@metaltipsandtricks.com
Instagram....... / metal_tips_tricks
Facebook........ / dale.derry
coreprintcastings.com (This Link might be down. Try the other one)
coreprintpatterns.com
![จังหวะนี้ - เม้ก อภิสิทธิ์ [ Official MV ] จอนนี่มิวสิค](http://i.ytimg.com/vi/4gQRZCkRyiU/mqdefault.jpg)
That looks like it took a heck of a lot of work, blood, sweat, tears and editing!
This was the toughest video I have ever done, I was working with a new mic that was horrible. I did discover how bad it was until I started editing 😳😳, but thanks for the comment 😀😀
Ayee the tot'ster!
Build Something Cool I agree with Tony! I appreciate the hard work you put into your videos, Dale. And it tells. I will say though you seemed rushed in this one. Perhaps in the future try breaking the process up into two or three days ? It can be a long process to get good results. Me personally I would prefer waiting longer on a video to publish than rush one out to catch up. Just my two cents. I love your content.
Hey scaliwag put my comment in your next video so everyone can know that youre a scaliwag btw my cats not working he only poops 1/4" -20 fasteners
Can you counter this video? Maybe another technique?
Wow, this takes me back 40 years to when I was an apprentice Fitter and Turner. In our apprentice school we all were given a cast iron table 6" square. We had to hand chisel it, then file it, then draw file it and then scrape it until it was over 90% flat (using bluing). One of our first projects and we used that flat edge throughout our apprenticeship..
I too am a fitter machinist and back in 70s did scrape cast iron block. What a dated technique, surface grinding was more than enough, and sure did a lot of surface grinding. Only ever did to scrape a press crank bearings. Patience is a gift as it took me a long time to get them blue up and running,and also tapered keys, did a few of them. All done to fit correctly on the job. Most time I think its not worth bothering with unless you are a tradesman and then only very rarely
My friends always wonder how I know so much about random shit. Well this is how...
Internet for good.
Unbelievably awesome. I had never heard of this and wouldn’t have believed it if someone told me about it. Makes perfect sense how this works. Thanks so much for making this 😀
Absolutely fascinating. Seriously couldn't turn it off. I've heard of scraping ways before but never truly knew what it was. Your patience is second to none!
Seen a hand full of scraping videos including one at Vintage Machines and Ox tools Thank you for going through the thinking of what when. and not using a power scraper.
True old school work that requires a lot of time and patience but the presentation was very well done. Truly a skill of its own.
Thanks for teaching me many things I did not know.
I also appreciate those who contribute to refined and further knowledge in the comment section. This holds true to many videos.
I’m about to buy a CNC lathe with hand scraped ways, and I found this very interesting! Thank you!
You've probably already figured it out, but the audio is dipping because the plosives are triggering a compressor and the compressor has too long of a release. Use a low cut filter to get the plosives out, and possibly raise the compressor threshold a bit so it's not so pumpy.
I kinda can't believe I watched this whole video. I just started getting interested in machining and don't really know where to start and this just excited my love for tedium. It's the little scrapes I like the best.
Dale thanks for taking time and effort on something others charge a lot of money for. It helped me tremendously and I have learned a lot. God bless.
I like the fast pace and density of this video, Dale. Lot of info. Keep it up !
Thanks for your positive comment ❤️
I spent hours learning and practicing hand scraping, have scraped machine beds, adjustment keys, surface plates etc.....thanks for posting.
I was surprised to read a lot of (what looked like to me) criticism of this video in the comments.
I'm actually in the middle of scraping in a small Chinese milling machine & scraping in my own
straight edges. I thought Dale did a very good job on this video. I felt he should know I liked it.
Good job Dale. Keep them coming.
Thanks for your support 😀😀
If your not actually doing it, I suppose a scraping video is probably the equivalent to watching grass grow.
To the ones doing it (especially if you don't have a lot of experience) they are very interesting.
It's always good to have someone else's take on it.
Dale I normally really like your videos. The audio speeding up and slowing down makes this almost unwatchable.
Yeah its like watching a late night ad selling a cheese grater where they throw in steak knives.
At first I thought he hat auto tune on
I had to stop watching because it drive me so crazy!
Got to agree..Not liking it at all. Would rather watch a longer video
agree, very annoying
Great information. Excellent video. Thanks for keeping up a fast pace as well. Much appreciated!
This is a great video, answered a lot of the questions I came up with my first scrape attempt!
Hi Sr, my name is Luciano from south Brasil I liked so much your work. I have a very old machine and I trying to give her some precision, You gave me inspiration, thank you.
I just caught this video. I still have my scraper. I was taught flaking, blue it, until all the material matches. Naturally the final step flake it in. It is a ART until you really learn it. Nice 👌
Great video! I've been working on my first real scraping project for my local high school robotics team. It's always great to hear someone else explain it in their own words. A few more concepts clicked in my head. Keep up the great videos.
Tim Mallard what are you building that needs scraping?
@@RandomNumber141 repairing a worn old milling machine
Hey Dale, you put a lot of time into this one. Great info, thanks for sharing!
I have done hand scraping when I was younger and I found grinding flat and grinding lubrication grooves in the work was the way to go.
If the work is too large to grind, I send it out to a shop with a larger grinder. I like hardened and ground ways.
By the way I did thumbs up this video.
This is an incredible process. I never knew until seeing this that this was a thing. It’s incredible how precise you can get it by scraping. I appreciate the knowledge. Thanks for sharing.
Dale, I always appreciate watching someone with more expert knowledge and more experience than I have doing a job like this. That said - and in the spirit of constructive feedback - I found this video very difficult to follow for 3 reasons.
The first was that your narration was racing along at high speed, while your camera was mainly focused on you, and on the actions you were performing mostly from a distance. When you did show those, the actual viewing of the action was very brief, and it almost looked as if you'd sped up the video. It would, perhaps, be easier for viewers who are learning to see longer close-ups of your hands and the tool on the workpiece, and possibly even with some of that slowed down during editing. What is obvious to you, with more experience, is not as easy for someone with less knowledge to understand.
Second point: you mentioned briefly at the beginning using yellow as a "highlighter." However, I really was not able to get a clear understanding of a) how, when and where to apply the yellow, b) what I should do to the yellow surface (or not do), and c) where in the overall process it comes in.
I was taught scraping using only two edges - one similar to your "60" and the other about 1/2-1/3 that size. The machinist who taught me used a very thin coat of oil-based marking blue (artist's paint, I believe), well rolled in. However, he taught me _not_ to attack the surface in long, deep gouges, but rather to start out with what would resemble a checkerboard of scraped & non-scraped areas. Then successive passes progressively reduced the size of the "squares," working to produce even patterns of high and low spots. With each overall pass, the "grid" would be finer, and the "spots" or "points" smaller.
Now, that may be a very old fashioned technique, and possibly the method you show is faster, or more effective - I'm not clear on that point. Where the Yellow comes in, and what part the yellow plays in your scraping technique was not clear to me as a viewer/student.
Finally, I realize that this is a long lesson, with many steps. That being the case, might it be presented in two parts perhaps? If you were speaking more slowly first as you describe in general what you're about to do, and then with your voice-over describing exactly what we're looking at close in on the tool and workpiece, at a regular or slow speed, ?
Although I have an engineering background and a good deal of practical workshop time, including having learned basic hand-scraping, I recognize that there is much more to learn about what can be done and how to do it - which brings me to the final point.
In editing this video, there is much "popping in and out" at various points in the process. The way in which this is done in editing is visually distracting. It also makes the "what is the proper sequence of events?" a little more confusing.
I appreciate your hard work and the large amount of time you spend in doing a video like this very much - I know it takes much longer to demonstrate something and make a video of it than to just do it. I offer these thoughts as a semi-skilled student, and in the hope that some feedback may be of use to you in making future videos. I thank you for sharing your time and considerable knowledge.
In the uk we do it slightly different tend to use curl strokes and put the blue on using felt pads spent 50 years building high precision thread grinding machines a lot of scraping for flatness and alignments. Hard work especially columating machine bases
Tool maker here. Very cool video, I think I'll try this when I buy some old equipment for my garage. I've used yellow for tempered/discolored steel, but I've never seen using yellow to contrast the blue. Very cool
I just watched a 30 minutes video of a guy scraping a piece of metal. Quarantine is really messing with me.
No if your country arent familiar with scraping you could learn and make money and charge higher reasonably for sacrity of this type of work untill you have people getting into this industry.
Thanks Dale, it is good you are back into the show & teach mode again.
Thanks
OMG!!! WOW, Best machinist videoeo EVER!!!! Thank you you are amazing! I loved watching this!!!!! You are the King!!!!!
A great video, very educational. As a dentist we use the same technique when adjusting the occlusion of people's teeth after a restoration or crown is placed. The dark spots with the light centers we call a "donuts" and checking, cutting, rechecking for new donuts I call chasing the dots. As with what you are doing eventually we get to even contacts, we then polish the surfaces and call it done. Again a very clear demonstration.
Cheese and crackers, just the thought of a dentist with those scrappers
Hi Dale, you really make some great damn videos! Always very informative and educational with a hint of comedy. I really like the sped up format of this particular video. Thank you for the time you spend putting these videos together for us. I really enjoy chilling out at the end of a hard day learning stuff from your videos. If you would only move once a year, you could probably make a lot more videos - ha ha. All thumbs up for your videos 👍🏽👍🏽👍🏽👍🏽👍🏽
Excellent, thanks. Took me back to my apprenticeship days - a long time ago.
What a smooth video. Very straight forward.
Thanks for the video, very useful and informative.
Great video. Admittedly not a skill I'll probably ever use but appreciate knowing the concepts!
Give your fireball tool guy a heads up. I was against buying their product but after your endorsement on the phone I decided to give them a try!
Great video. Thanks for your efforts!
Hi, I'm from Brasil. Your videos are an inspiration to me because here in Brasil we don't have tradition in scraping and because that is dificult to find tools and instruments to do it. Thank you, Luciano.
Thanks for your your kind words
Informative I use Prussian blue to mark and I've had a small tube for years it goes along way, even got my old scraper that i made from a file when I was an aprentice, I've used the yellow making grease for checking contact areas on gears I'll give it a try. I've got a new mini cnc mill to give all the ways a scrape to reduce sticktation and maximise lubrication of the ways.
Hello, I did a lot of scraping in my day. Worked in a overhaul shop reconditioning #2 Brown & Sharp OD grinders. we scrapped in everything. Main travel table and swivel table, Grind wheel stack also. Learned right away to hip scrape a med. pass on flat side first to stress relieve before any bluing. You didn't talk about hip scrapers but you were working on a smaller piece. Also you didn't cover flaking for oil retention. We cut rolled crescents rather than straight cuts. It was a lot of work but once you got started and saw how you could move and split high spots and spread out the pattern and points, that made it interesting. We usually had two machines in the shop at a time and three men scraping. That was in the 70s.
For reference, could you break these two points down? And note if my guesses are on point?
> pass on flat side first to stress relieve before any bluing
Rub the piece to be finished on a reference to relieve stress on the piece?
> how you could move and split high spots and spread out the pattern and points
Control on dot counts/patterns?
Seen you on Abom79's video on the Good of the Land Festival and then this video showed up on my suggested videos. Always nice to find a new channel with interesting content.
As far as I know blue was initially used when prussian blue was discovered as a synthetic pigment that had an exceptionally strong color and a extremely fine particle size. As far as I know it's still the pigment used to this day in most if not all spotting blues.
I worked with machinist who scrape a machine bed to get oil.pockets to ride the moving bed on. He just did a cross scrape only . I like the way you showed this.
Keith Lewis , he flaked the ways or surface. Different operation
It looks cool after scraping. The glimmer it gives off is nice
Have you come from a tool and die background? Your skill is rare nowadays. Excellent content---Thank you for sharing this!
so very valuable! tyvm for a wonderful intro to this skill/art!
Blue was specifically Prussian blue (iron ferrocyanide), which is both very fine and very intensely colored.
I'm reading Foundations of Mechanical Accuracy and I had some trouble visualizing this process until I saw this video. Great job.
I'll write out the relevant part of the book for any interested readers. They say the first thing you need for mechanical accuracy is "flat master plane" which you achieve with three 4ft x 4ft cast iron plates that you use this bluing process to get flat. You mate two of them together and find the high points to work them down. But if you only did this with two plates, you could end up with a ball and socket scenario where one is concave and once is convex. So you need the third plate to reference both of those to which will keep them all honest. And they said each plate and it's built-in rib supports weighs 2000 lbs. Pretty wild and brilliant stuff. Cheers
Thank you for an interesting book reference on topic, those are always great.
Excellent video good fast pace there is a lot of information to pass and you did it.
Really nice video sir... Keeping sharing such cool stuff
Thank you in particular for the segment where you talk about how much material is being removed from each scrape. I did a pretty good search online and couldn't find anyone that talked about this to the depth I needed. (Pun intended) You busted out the dial indicator and measured the depth of cut and that is exactly what I was looking for.
I'm actually surprised it removes a quarter to a half a thousandth, I was expecting much much less.
I actually had a job doing this back in 89 !!! I was very surprised to see this video !!! Very difficult to get good/fast at doing this !!!
Hole subject gone 30min and didn't even think fast forwarding.
You didn't go too deep in the subject and that IS GOOD.
Really enjoyed tour of it.
Thanks👍
I had an antique lath bed hand scraped, very expensive but works like a new one, holds super close tolerances.
Very cool
Great video but an audio fudge? Video at 1.5 speed? If not, stop buying the four packs of Red Bull!
I agree, it's something like 1.25x video with the "maintain audio pitch" sadly that really amplifies the pops in the audio.
I watched it @ .75 speed and it is much better. It also loses that 'caffeine' effect! 😛
Sounds like too many adobe audio presets slapped on like a piss in the wind or duct tape weld. Or crap equipment/bad file management causing downsampling somewhere along the way. Man is an excellent machinist non the less
@@maxpert9 It's crazy. It's like he doesn't care to spend his life learning about audio, and got it good enough so 99% are fine with it. Not sure what he should do differently.
In editing, detach the audio. Speed up the video as you wish, run the audio at correct speed. Cut to match length.
I find it fascinating to learn from old school machinists. Will I ever use scraping? Probably not, but it would be a nice skill to have.
This is the first time I saw or heard of some scraping metal. Interesting.
Good idea to flip your work end for end every scrape to average out .... also be careful not to press down when rubbing that causes pressure points and false reading.... when I was 17 and poor I would hand scrape engine heads that's easier because all you're doing is matching it to the block.... and also you need to intentionally leave slight high points around each cylinder and other strategic points to create better seals with the gaskets filling the voids
Prussian blue was the first artificial blue pigment which had also a uniform particle size due to the fact that the powder itself is the result of chemical reaction and not of grinding some solid object. That was a property that led to use of it as scraping dye. Before that blue pigment was rare and expensive, (most expensive, I dare to say) and, as every ground powder consisted of particles of uneven size making it inappropriate to use as scraping paint.
Search TH-cam for “the invention of blue” for more details on theme.
I'm going to look that up
I looked up "Prussian blue" and found a lot of interesting information which agrees with what you wrote here. Thanks for letting us know about this.
WOW Dale you have got a difficult crowd to please! Never the less good video, thank you
Thanks for the support 😀😀
@@BuildSomthingCool... agreed, thanks for doing this, i learnt something new. appreciated.
Great Tutorial. Job welllllll done!!!
We use files for Kirksite. We would take the file blades off with a bench grinder, then get them precision ground in as flat as possible, and got the edges at 90°. Then we would take them and work and shape them from there with bench grinders to make radiuses or even venturing into hand shaping.
Talking of ink I've been at art school nothing into machining or so, and this process tho I kinda knew of it it's fascinating! Mesmerizing to see close like those lathe's videos.
I've been a machine tool fitter for 50 years and always use high spot micrometer blue, i'v never seen scraping done for size, it's always done to get the surface flat and feathering to get a bearing finish, i spent many years scraping bearings just as laborious as flat bed scraping but got more satisfaction from doing it.
Very professional ie. TV show quality video nice work thanks for sharing your knowledge
Wow, this was very informative.
Awesome channel, I just found it!!!
Might not want to forget the rules of straight scraping: 1. Individual scrape marks or points 2. Individual scrape lines (meaning the spacing from the line above and below the one
your scraping can not touch the line before or after, if they touch you will get long openings or ruts). 3. Depth of the scrape mark or cut. You went from high in the middle to a hole, that wouldn't be my goal, maybe should measure first to see how far you need to go before taking off in that direction.
don't mean to sound grumpy but I did a four year machine tool fitter apprenticeship and the men who taught us had a life time of mastery. Having someone with no clue giving a tutorial on my trade gets to me . RK would probably also agree with me
chris0tube q
@@chris0tube Did I endorse anything? I tried to offer "kind, positive, constructive, criticism" I would not give Dale's technique shown here a very high score myself as I think he seems to forget a lot of Richards instruction. Of course I am no expert in scraping. Someday I likely will do some scraping on video then everyone can critique it too. lol
@@chris0tube Until I get my granite reference surface checked no need in messing a bunch of stuff up by scraping it to a bad master!! Also scraping jobs for me are non paying so they go on the back burner. :-) I have 2 big cast iron plates and 6 straight edges that all likely need attention so plenty to do!!
@@chris0tube 'everyone is scraping everything' ;-) Perhaps I should be glad that my trade is now trendy like knife making or whatever is next!
Very detailed and interesting. Might I ask what type of grinding wheel do you use to grind your stones flat?
Look, a lot of comments getting into the weeds (and in a way, I guess precision machining is *all weeds*) about the lack of subtlety, but as a demonstration of the concept, an intro, this video serves the purpose very well.
Apart from some audio issues - I really enjoyed it! Nice work Dale!
Thanks for your comment. I’m getting a new mic😀
edi malinaric
Aged engineer here.
That radius gauge that you are using has a 1" x 1" hole in the middle but the radii on the sides will be in mm not cm - a 10x difference.
Thanks for showing that slide hammer scraper. I hope you won't mind if I make one.
Happy Xmas to all - cheers edi
As audio technician, I want to give you some feedback on your lav-mic placement. Always place the microphone to the side of your mouth, pointing directly at it. Never directly in front of your mouth or you'll get excessive plosives as you have here. Place the mic such that it's not being hit or ruffled by any clothing directly to it's casing, in this case it would have been best to put it on your collar. :)
Thanks for sharing. Heard about using slips blocks and feeler gauges, and turning the bar 180, like setting a spirit level, to get an area flat? Or use of a camel backed straight edge? Or using an electric scraper?
Very cool stuff.
There is something so cool about scraping... Why is it making a flat piece so obsessive?
Do I need to mention that I cant wait for my scraper and a surface plate to come home :)
Thanks for a well made video!
Hey Buddy, very informative video. I've got a few observations/questions. #1, how flat is your granite surface plate? One place I worked for, when it didn't feel right when I slid the height gage across it, I put a .0001 indicator on the height gage and slid it around the surface plate itself, it was about .004 out of flat. 4 thousandths. They had been using it for sanding parts for years, and the abrasives just rubbed a big low spot on it. Most of the plate was less than .002, but this wasn't the most accurate way to check it. Now, ours get checked and calibrated every other year by the Standridge guys. And nobody sands on the plate (we're a defense contractor, close tolerance work) anymore. Also, I've seen videos where a guy says he got his mill table within .0006 over 36 inches. My first thought was, how are you checking it? I seriously doubt if you've gotten within
.0006, especially over 36 inches and even more doubtful, in your garage at your house, unless you've got a very large, calibrated plate. Next question. How do you know how parallel your are when you do the opposite side, and then how perpendicular you are to the first 2 sides?
Great work. Thanks
In an older video you made, "The Cutting Edge", about making a shearing bead rolling die, you showed a pre-drilled blank, bought from a Big R store.
You mentioned turning profiles on them. In the video, you ran a bead of weld around the material, then ground it with your post grinder to get the cutting edge.
I'd like to pick up a couple of those blanks, but don't know what to call them. What does Big R sell them as?
They're about 50 minutes away, and I'm not good at 'phone charades', trying to describe things. Like to verify they have them in stock..
Thanks for the info, and thanks for sharing your skills and knowledge in your vids.
GeoD
Great video! Can you make a video on making your own surface plate
So, you just popped in to Keith's place in S Georgia from San Francisco? Love your show! Thanks Dale.
Heck, I’d travel across the country to work in Kieths shop too! His shop is just that good! I bet he was in Georgia for other reasons. Chris
@@shadowdog500 - oh hell YES!
Well explained and nicely paced. See you at the Bar Z ?
Great video and accurate, I am a tool maker and had to hand scrape 2 bearing surfaces that were 6 by 6 feet, this method is insanely accurate but my gosh does it suck balls lol it is tedious and will see your fans hand and arm out, and hand scrapers are by far superior to air powered or electric, the more high spots you see with high spot blue the better, good rule of thumb is 50 spots per square inch
Veel bijgeleerd. Goede uitleg
Really interesting. Thanks for the video! By the way, what kind of roller was that you were using to spread out the ink?
Rubber roller
I was taught this 10 years ago from a ole timer not many people doing this anymore 👍
If surface grinder wheel doesnt deal with the wear problem scraping is still important
I like surface grinding the best. If you need surface lubrication grind in criss-cross fine grooves in the surface. This could be more automated with a Graver Meister type reciprocating machine.
thanks for the information
Hi dale your gave approxments of the number of scrapings per scraper size. How much time did you have in scraping the one side that you were working on in this vid to the 20 point and then the 40 pt.? A subscriber and follower. Keep them coming .
Your energy is incredible.
The haters are insecure.
Orange is the opposite of blue. Red, Blue, Yellow are pigment primaries. Purple, Orange and green are secondary (mixed) colors on the opposite side of the color wheel.
Great video, Dale.
Cheers, Gary
Thanks Gary
If I scraped a piece of metal I would need to take it back to the surface grinder to get it flat again.
it's not for nothing, we would have nothing without it.
Very informative 👍
very professional
Great knowledge source. I'm not an expert whatsoever, but I plan to build my own precision shop for hobby. I see you do the straight scraping, but in Moore's "Foundations of Mechanical Accuracy" I saw "half-moon" strokes as the only one used. Do you have any experience with that?
New sub here. Just found your channel. I look forward to watching and learning more from your channel. Thanks for sharing your skills and knowledge with us.
I have several hand scrapers and a few practice pieces to work on including: a 6" dia.x 0.5" chunk of Dura-Bar and a high-quality, machined 18" cast iron straight edge made by Dennis Foster in WA. This will be my winter project for when it is crumby and cold outside.
After I practice on the pieces that I have, I then plan on scraping in the mill and lathe ways on my machines. I'll probably end up scraping everything in sight eventually. LOL
It's too bad that the Biax power scrapers are so expensive. I am really hoping to nab one of them at a decent price someday
Where can I find that yellow dye? I have the blue but haven't located the yellow yet.
People use blue and red,
Personally I use Stuart's micrometer engineers marking blue, comes in a little tin and o go through many!
I also take two inch wide rag, roll it up tight and put loads tape around it so only one end is showing, then that's what I apply and spread the blue with, we would of been strung up as apprentices for using a roller, but like you said every one has their own method!
Very nice video. Thanks
The patience is remarkable. Question, do most guys make thier own surface plates or can you buy them perfectly flat already? I dont need one but im fascinated by the precision. How much would a perfect plate cost to buy on average?
There are several grades of surface plates and the cost reflects the flatness. Cheap grade B (toolroom grade) plates are good for sharpening tools will sand paper and doing rough layout. Grade A (inspection grade) and grade AA (laboratory grade). There is an even crumbier grade, but it would be almost useless for scraping work.
The grade AA plate has a flatness of (40 + diagonal (inches) of surface plate squared / 25) x 0.000001″. The grade A is half that and grade B half again. Too much information? 😀
You can pick up a decent black granite grade A surface plate 12" x 16" x 3" for around $160. This stone will weigh in at around 80 pounds. You likely will not be moving it around much 😀The surface plate that I got came with an inspection diagram showing the flatness of the stone.
I read that good rule of thumb is to buy the largest sized grade A plate that you can afford if you plan any serious use. You probably don't need to go to grade AA, but it would be pretty cool.
There are also cast iron surface plates and even glass. Bring your checkbook.
the OG machinist technique
You are the best