On March 20, 1982, at the age of 20, I was a new machinist (2 months) operating a manual 36" Bullard VTL, after having operated a large manual hydraulic drill press for the previous year+. I worked for a small company that remanufactured wellhead equipment, but we also made new wellhead articles from forgings. That day, I was making my second pass (maybe 0.020" depth) at cutting threads (8/inch API) in the bore of a 7 1/16th" 15,000 lb.-rated wellhead flange, that I had already machined from a near-net-finish forging on the back side, when something caused a chip in the cutting edge of the threading tool (maybe hit an inclusion and chipped?). The shavings went from forming a harmless ribbon ball in the center to a jagged, deformed shaving that shot straight out between the jaws and slapped me harmlessly in the hip. Because it was a manual machine and the threading tool was traversing down toward the table in the vertical turret at 1/8" per revolution, I stepped back and grabbed the lever to disconnect the traverse and keep that vertical turret from engaging violently with the spinning table. Unfortunately, the shaving string extended farther out and, luckily dropped lower than my hip (or waist or thigh) and snagged my pants behind my left knee and cut through my peroneal nerve, which operates the muscles opposite the calf and provides feeling in the skin on the top of the foot out to the toes and up the lateral side of the shin. I went by ambulance to a nearby small hospital, where the doctors started discussing a surgery, but my brother-in-law arranged for me to be transferred to Hermann Hospital (now Memorial Hermann), in Houston's Medical Center. That evening, I underwent surgery to repair the cut and reattach the nerve. The neuro surgeon was Dr. Michael Minor. The orthopedic surgeon was Dr. James "Red" Duke, a well known Houston E.R. surgeon. Dr. Duke was in the E.R. as a Resident Surgeon on 11/22/1963, with Kennedy and Texas Governor Connally (generally credited with saved Connally's life). In subsequent years, he was frequently called on to give medical commentary to Houston media. Later, in 1987-88, a TV show, based on Dr. Duke, called "Buck James" and starring Dennis Weaver, ran for 2 seasons. It was about a West Texas doctor working in a NYC hospital. My brother-in-law was able to get me to Dr. Duke because he had previously been a paramedic in Houston's Fifth Ward for over 8 years and had brought many E.R. patients to Dr. Duke and that relationship got me on Dr. Duke's agenda that evening. It took about 18 months, but I did regain a bit of function from the shin muscles and have since only had a modest limp, not usually noticeable to others unless I'm tired or stumble. I saw Dr. Duke a handful of times after my treatment ended. He had an apartment in the hospital and I ran into him there several times when I was there. A couple of those times was when my daughter was there to give birth to one of her 4 children. A couple of those times, I reintroduced myself to him and gave him the 15-second version of our initial meeting and he said he remembered me (probably primarily remembered my brother-in-law). The last time I saw him was in 2014, when he was ~86 years old and sitting alone at a table in a Thai restaurant in Houston’s Rice University Village. As I was leaving, I reintroduced myself to him and gave the 15-second version of our initial meeting and he, again, said he remembered me. I noticed he was reading book published in 2014 and entitled “The Bonobo and the Atheist: In Search of Humanism Among the Primates.” He said it was very interesting and very thought-provoking, which I found interesting, coming from a man that had a divinity degree from a Baptist college. He struck me as a wise and sober man with a gentle and contemplative mind. I wish that I had stayed longer to chat about the book and what he took from it, but I was reluctant to intrude any further on his privacy. He died less than a year later, in 2015. If you read to the end and enjoyed it, check back with me, if you want to read more of my stories.
I ran a cnc Bullard with a 56" table and a Fanuc control for 7 years and made all sorts of things from a controllable pitch propeller hub to pulleys for arresting cables on air craft carriers to water jet parts. It was the best and most interesting 7 years in my 45 years as a machinist / tool maker.
I was a machinist with Michelin for 11 yrs after 4 in the Navy, I operated various machines but mostly the VTL’s , made tons of chips. Spent the next 20 yrs in maintenance at the tire mill.
Was a machinist for over 20 years, had to medically retire because of spinal injuries, i miss it so much! I was mostly a turning center and VTL/VTC operator, the only thing i don’t miss is the lifting and straining.
Almost looks like the process for the mrap turret bearing. Miss running an old Olympia. Nice looking finish, it soooo shinnney lol. Keep them chips flyin brother
Brings back memories of retaining rings we would swap out on the end windings of generators .... power plant size generators. Heat those things up to 600*c to get 0.04" growth for a shrink fit.... memories 🤔
Makes me remember back in the 1970's as an apprentice. I got put on a 120" Webster and Bennet vertical boring machine to machine some castings, it scared the f***ing c**p outer me..lol.
My first venture into programming a CNC machine tool was on a Webster & Bennet vertical turret lathe. We used it to machine overhead crane pulley wheels from a forged ring of material. Happy days.
Bosted Tap were small and a 90 gallon container stuffed with aluminum chips gets heavy every week. Better than 180 gallons of birds nest and wasted space 🤔
So, for the drilling, I'm assuming it's only X and Z travel, and uses rotation of table for "Y" positioning? Also, how many different tools can the machine hold? Can it do milling, or only drilling/tapping?
It can hold 16 tools, 8 for turning and 8 for milling. Yes, it can do milling, drilling, and tapping just like any milling machine. th-cam.com/video/eTRhjyn2KXg/w-d-xo.html
Enjoy your videos very much. I get the impression that you are located in Poland or some other part of eastern Europe. Why do you use imperial measurements instead of metric?
I haven't seen any videos on how to use this type of jaws, do you just manually open and close them with a wrench to center part then torque them all tight? If so, how many ft.-lb. are you tightening them at?
Ok, Chris good but I would like to ask did you put an indicator on your finish part before you release the jaws how much movement on the materials. Because if the indicator gave readings then the dimension changes once you remove the finish part on the machine.
How close are your tolerances and do you maintain good concentricity with this retainer ring. I use to make parts like that on a manual kick Bullard. Putting in a large radius was always tricky but a kick Bullard allows you to control your RPM's.
The tolerances were not that critical +/- 0.002" ,but I got it done within 0.001" on flatness and circularity (roundness) just have to be really careful how much pressure you put on your jaws.
First CNC lathe I ran was a Seiki VTL with a 60” diameter table. This machine looks almost exactly like the vertical I learned on. The chip bed and everything looks the same. I’m interested to know if it is. Honor Seiki VL-160CM was the model I learned on!
I only made one piece and I don't remember exactly how long it took. I'm a one guy do it all, setup, get the right tools, programming and machining and we are a repair machine shop so nobody is watching you with a stopwatch just to save couple of minutes.
@@ChrisMaj Thanks for the answer. I just wanted to know how long the whole process from blank to finished part takes? Approximately. ;-) Such videos are very interesting, but I can't imagine how long it will take. Greetings.
Hi Chris what is the size of your vnmg 400 or 500 series and the brand is mitsubishi i think.and finally i just received my gv-1200 the thaiwan guy moint it actually and every time i ear la dance des canard je ris.bonne journée.
6:42 looks like built up edge, maybe spindle speed too low? Doing the math is 31 m/min, more like HSS speed than carbide speed... I guess it's for tool life but it may chip the insert sooner. But for sure it has worked fine. Nice job!
Several years ago, in a shop outside of Chicago, an operator got caught up in the clamps holding down a large valve body on a 6' diameter VTL. It's a big shop with lots of distance between machines. Nobody noticed right away, he must have been too surprised and dead too soon to call out. Never defeat the safety interlocks on your machines, ever.
All of the Cnc lathes where I work are 3 jaw, I’m sure they can change over to a 4 jaw chuck, but what is the point of having more jaws? More accurate? Is that why you are using the indicator? Just curious. Beginner Cnc operator.
A los 18 años trabajaba en un torno vertical shibaura máquinas rodetes para turbinas, carcasas para bombas , tazones, chumaceras, impulsores, cabezas de compresores, camisas, poleas , después de eso e trabajado en muchas máquinas CNC de varias marcas tornos , centros de máquinados, mandriladoras etc.y fabricado infinidad de piezas de todos tamaños y me quedo con mis primeros años donde empecé de cero donde me enseñaron a programar y donde me dieron la confianza
Yes the machine I ran had an adjustable hydraulic 4 jaw chuck and using a dial indicator to sweep the part being careful not to over tighten and distort the part.
@@ChrisMaj Very good answer. After roughing and part has cooled and ready for finishing you will see how much it sprung when you indicate it for concentricity and flatness.
Greetings, can you please send me your tapping program, I operated CNC vertical lathe so I would like help with cancelling instructions for drilling and tapping program
هده الآلة خراطة أفقية.ليس مهم نوعية و البرنامج اشغلت في ماكينات مختلفة و برمجتها مختلفة.لكنهم تقريبا يتشابهون .الفيديو يريك تقنيات العمل . كيفية تحكيم القطعة.
the perfect amount of time spent on each step and no mind numbing music. thank you..
The whistling even went well with the video 😂
On March 20, 1982, at the age of 20, I was a new machinist (2 months) operating a manual 36" Bullard VTL, after having operated a large manual hydraulic drill press for the previous year+. I worked for a small company that remanufactured wellhead equipment, but we also made new wellhead articles from forgings.
That day, I was making my second pass (maybe 0.020" depth) at cutting threads (8/inch API) in the bore of a 7 1/16th" 15,000 lb.-rated wellhead flange, that I had already machined from a near-net-finish forging on the back side, when something caused a chip in the cutting edge of the threading tool (maybe hit an inclusion and chipped?). The shavings went from forming a harmless ribbon ball in the center to a jagged, deformed shaving that shot straight out between the jaws and slapped me harmlessly in the hip. Because it was a manual machine and the threading tool was traversing down toward the table in the vertical turret at 1/8" per revolution, I stepped back and grabbed the lever to disconnect the traverse and keep that vertical turret from engaging violently with the spinning table. Unfortunately, the shaving string extended farther out and, luckily dropped lower than my hip (or waist or thigh) and snagged my pants behind my left knee and cut through my peroneal nerve, which operates the muscles opposite the calf and provides feeling in the skin on the top of the foot out to the toes and up the lateral side of the shin.
I went by ambulance to a nearby small hospital, where the doctors started discussing a surgery, but my brother-in-law arranged for me to be transferred to Hermann Hospital (now Memorial Hermann), in Houston's Medical Center. That evening, I underwent surgery to repair the cut and reattach the nerve. The neuro surgeon was Dr. Michael Minor.
The orthopedic surgeon was Dr. James "Red" Duke, a well known Houston E.R. surgeon. Dr. Duke was in the E.R. as a Resident Surgeon on 11/22/1963, with Kennedy and Texas Governor Connally (generally credited with saved Connally's life). In subsequent years, he was frequently called on to give medical commentary to Houston media. Later, in 1987-88, a TV show, based on Dr. Duke, called "Buck James" and starring Dennis Weaver, ran for 2 seasons. It was about a West Texas doctor working in a NYC hospital.
My brother-in-law was able to get me to Dr. Duke because he had previously been a paramedic in Houston's Fifth Ward for over 8 years and had brought many E.R. patients to Dr. Duke and that relationship got me on Dr. Duke's agenda that evening.
It took about 18 months, but I did regain a bit of function from the shin muscles and have since only had a modest limp, not usually noticeable to others unless I'm tired or stumble.
I saw Dr. Duke a handful of times after my treatment ended. He had an apartment in the hospital and I ran into him there several times when I was there. A couple of those times was when my daughter was there to give birth to one of her 4 children. A couple of those times, I reintroduced myself to him and gave him the 15-second version of our initial meeting and he said he remembered me (probably primarily remembered my brother-in-law).
The last time I saw him was in 2014, when he was ~86 years old and sitting alone at a table in a Thai restaurant in Houston’s Rice University Village. As I was leaving, I reintroduced myself to him and gave the 15-second version of our initial meeting and he, again, said he remembered me. I noticed he was reading book published in 2014 and entitled “The Bonobo and the Atheist: In Search of Humanism Among the Primates.” He said it was very interesting and very thought-provoking, which I found interesting, coming from a man that had a divinity degree from a Baptist college. He struck me as a wise and sober man with a gentle and contemplative mind. I wish that I had stayed longer to chat about the book and what he took from it, but I was reluctant to intrude any further on his privacy. He died less than a year later, in 2015.
If you read to the end and enjoyed it, check back with me, if you want to read more of my stories.
Brings back memories, I can smell the coolant and hot chips.
For me too. We had a 120” King where I worked. Used to really setting it up and running it.
O
I can still hear the old man yelling because we can't cut metal any faster.
Me too, And the hot chip that gets your lip !
I ran a cnc Bullard with a 56" table and a Fanuc control for 7 years and made all sorts of things from a controllable pitch propeller hub to pulleys for arresting cables on air craft carriers to water jet parts. It was the best and most interesting 7 years in my 45 years as a machinist / tool maker.
I was a machinist with Michelin for 11 yrs after 4 in the Navy, I operated various machines but mostly the VTL’s , made tons of chips. Spent the next 20 yrs in maintenance at the tire mill.
There is a job by me hiring this for 42$ hour ! Do i need school for this or can i learn on the job ?
What a superb machine and an equally good movie to go with it!
as a civil engineer with mutiple construction/machinery related interest, this really soothes me
Was a machinist for over 20 years, had to medically retire because of spinal injuries, i miss it so much! I was mostly a turning center and VTL/VTC operator, the only thing i don’t miss is the lifting and straining.
I think the same , I miss turning and threading but no the lifting and straining .
There is a job hiring near me for good money doing this can i learn this on jobsite ?
Love it, as a Machinist my self I appreciate your work
Thanks man
I never had much luck with Spade drills, but you did very good.
Always worth watching! Thanks, Chris.
Chris another great video of your fine turning skillz. Your channel is starting to take off like a rocket. Keep them videos coming.
Thanks man. WESOŁYCH ŚWIĄT, SZCZĘŚLIWEGO NOWEGO ROKU, co by się biznes rozrastał.
@@ChrisMaj hi sir
I want a job, I have 5 years experience and now in my country i am jobless
Even now at 72 yrsold i still use a 72 inch webster n bennett machining large stainless forgings here in uk
Yu should be well retired mate get a life and relax walk on a beach. Give the youngsters a chance!!
Stop being greedy!!!!
Wonderful video showing depth of cut and feed rates.
That was long time ago. I was just kind of posting some work I did. Lately my channel picked up more interest so I'm trying to post more often now,
@@ChrisMaj Love VBM’s especially when they’re equipped with a live spindle. One of these days we’ll see some Y-axis VBM’s hitting the market.
the feet per minute is unreal! awesome
8:30 Someone's whistling the dance of little ducks. :-))
Almost looks like the process for the mrap turret bearing. Miss running an old Olympia. Nice looking finish, it soooo shinnney lol. Keep them chips flyin brother
Beautiful finish
Brings back memories of retaining rings we would swap out on the end windings of generators .... power plant size generators.
Heat those things up to 600*c to get 0.04" growth for a shrink fit.... memories 🤔
At work we just bought a new 12' bed Toshiba and it is one hell of a machine
Chennai toshiba-va??
Youji vtl??
UR name??
Nice work!! Thanks for sharing
Thank you! Cheers!
World class work.
vtl's are amazing, the temps run the 10,000 part jobs and the real machinest run the vtl
Makes me remember back in the 1970's as an apprentice. I got put on a 120" Webster and Bennet vertical boring machine to machine some castings, it scared the f***ing c**p outer me..lol.
My first venture into programming a CNC machine tool was on a Webster & Bennet vertical turret lathe. We used it to machine overhead crane pulley wheels from a forged ring of material. Happy days.
I have a conventional 1 metre VTL. Runs superb.
I used to run a VTL OM 80 inch chuck. Kinda fun to play with.
Besser geht es nicht mehr Perfekt, absolut perfekt! BRAVO !!!
So satisfying to watch..
Very impressive machining, difficult to visualise the actual size, even though you list the material and drill dimensions.
Thanks for sharing.
Banana for scale 😉
@@ChrisMaj 🍌🍌. This size 🤗. Showing the chips being carted away would scare some people though, serious metal removal.
Great videos. Regards John.
@@bostedtap8399 Thank you sir.
Bosted Tap were small and a 90 gallon container stuffed with aluminum chips gets heavy every week. Better than 180 gallons of birds nest and wasted space 🤔
I am impressed good work
These videos are so relaxing
So, for the drilling, I'm assuming it's only X and Z travel, and uses rotation of table for "Y" positioning? Also, how many different tools can the machine hold? Can it do milling, or only drilling/tapping?
It can hold 16 tools, 8 for turning and 8 for milling. Yes, it can do milling, drilling, and tapping just like any milling machine. th-cam.com/video/eTRhjyn2KXg/w-d-xo.html
Enjoy your videos very much. I get the impression that you are located in Poland or some other part of eastern Europe. Why do you use imperial measurements instead of metric?
Well actually I'm Polish and Poland is all metric, but I work in the US.
Nice work. Are those threaded holes blind? You should use a spiral flute tap in that case. To pull the chips out the top instead of pushing them down.
How long did the job take ?
If you want to try a different tapping oil , try mixing soluble oil with white lead if you have it .
Karl's banana unit of measurement,Curtis is going to be jealous
Those are perfect chips coming off.
Can you explain as to why you centered drilled before using those large drills? Those large drills don't need to be centered drilled.
Show the tool changes more. That's a cool feature I've never really seen on a video before. What machine is that?
Vertical Turning Machine, Yama Seiki GV-1600m
Nice work 👌🏻
I caught that whistled rendition of The Chicken Dance. :)
That's a good workable piece of the big vertical.
Wow!
How many tools and how long did it take for the whole process?
That's just awesome machining work!!!! Od and ID. Question... did y'all make those tool blocks?
If by tool blocks you mean the tool holders where you clamp the tools than no ,they came with the machine.
Awesome
Chris Great work 👍Can you show fixturing closely?
I haven't seen any videos on how to use this type of jaws, do you just manually open and close them with a wrench to center part then torque them all tight? If so, how many ft.-lb. are you tightening them at?
Manual tighten..tighten all you can...use cheater bar..
Almost same machine i used to handle when i was working in Dubai Uae before,Cnc vertical lathe machine VTC .
Perfecto mi amigo Chris ver esto me emociona Saludos desde Torreón Coahuila México 👍👍
Ok, Chris good but I would like to ask did you put an indicator on your finish part before you release the jaws how much movement on the materials. Because if the indicator gave readings then the dimension changes once you remove the finish part on the machine.
Saludos al de Torreón soy lagunero también maneje ese torno si no me equivoco es un Honor y creo que es fresador tambien
How close are your tolerances and do you maintain good concentricity with this retainer ring. I use to make parts like that on a manual kick Bullard. Putting in a large radius was always tricky but a kick Bullard allows you to control your RPM's.
The tolerances were not that critical +/- 0.002" ,but I got it done within 0.001" on flatness and circularity (roundness) just have to be really careful how much pressure you put on your jaws.
First CNC lathe I ran was a Seiki VTL with a 60” diameter table. This machine looks almost exactly like the vertical I learned on. The chip bed and everything looks the same. I’m interested to know if it is. Honor Seiki VL-160CM was the model I learned on!
It's a GOODWAY Yama Seiki GV-1600m 63" table.
8:23 :) whistling
Nice Job Man! Thanks for this Video.
How long did the whole process take?
I only made one piece and I don't remember exactly how long it took. I'm a one guy do it all, setup, get the right tools, programming and machining and we are a repair machine shop so nobody is watching you with a stopwatch just to save couple of minutes.
@@ChrisMaj
Thanks for the answer.
I just wanted to know how long the whole process from blank to finished part takes? Approximately. ;-)
Such videos are very interesting, but I can't imagine how long it will take.
Greetings.
Hi Chris what is the size of your vnmg 400 or 500 series and the brand is mitsubishi i think.and finally i just received my gv-1200 the thaiwan guy moint it actually and every time i ear la dance des canard je ris.bonne journée.
It's a VNMG400 and the brand is KORLOY .
6:42 looks like built up edge, maybe spindle speed too low? Doing the math is 31 m/min, more like HSS speed than carbide speed... I guess it's for tool life but it may chip the insert sooner.
But for sure it has worked fine. Nice job!
Yea wouldn't it be nice if you couldn't go too slow, but you can, and I didn't know this until recently
How do you get the job where you go around and change all the inserts?
Fond memories of working a 48" NC Webster Bennett many years ago.
Which material is there you were machine ?
please tell me how to write tapping program. I don't know how to use it. I've searched alot. I've machining center kitamura my center.
It appears to me that VTLs are mostly used for large diameter short pieces.
But I wonder, can they turn long pieces of work?
On that VTL I can turn up to 51.18" ( 1,300 mm )
@@ChrisMaj that's quite respectable, thanks for the info.
Several years ago, in a shop outside of Chicago, an operator got caught up in the clamps holding down a large valve body on a 6' diameter VTL.
It's a big shop with lots of distance between machines.
Nobody noticed right away, he must have been too surprised and dead too soon to call out.
Never defeat the safety interlocks on your machines, ever.
So, you can reach table in z? How come my company bought youji machine that won't reach table?
Where can I buy the newest model of that machine? Do they make a larger one?
Yes they make them bigger. Check out Yama Seiki vertical turning.
@@ChrisMaj thx
Please tell me how is supplier for inserts? and which geometry you are using?
I’ve been running dorries st250 for 2 years similar to this muchine with Siemens sinumerik 840D controller on it and it was great
When to use coolant or not?
All of the Cnc lathes where I work are 3 jaw, I’m sure they can change over to a 4 jaw chuck, but what is the point of having more jaws? More accurate? Is that why you are using the indicator? Just curious. Beginner Cnc operator.
Yes they are more accurate and you can do some odd shapes th-cam.com/video/eC7c4SJkzzQ/w-d-xo.html
He he ja to bym musiał ten pierscień na dwóch maszynach robić .
A los 18 años trabajaba en un torno vertical shibaura máquinas rodetes para turbinas, carcasas para bombas , tazones, chumaceras, impulsores, cabezas de compresores, camisas, poleas , después de eso e trabajado en muchas máquinas CNC de varias marcas tornos , centros de máquinados, mandriladoras etc.y fabricado infinidad de piezas de todos tamaños y me quedo con mis primeros años donde empecé de cero donde me enseñaron a programar y donde me dieron la confianza
R the cutters w/o coolant being sprayed on the cut cooled at all? Considering what a big cut they r taking it seems like they would overheat.
I did use coolant, I'm just trying not to use it while recording.
Not always necessary with steel, depending on workpiece tolerance.
Is it possible to mill contours with that machine?
Yes th-cam.com/video/Z2J7yW0WqEk/w-d-xo.html
Fun to watch👍👍👍👍👍👍👏🏻👏🏻
Looks like a retainer ring from a pressure seal valve 🤔
Awesome stuff! I imagine you must be careful to not overtighten jaws on a job like this?
For rough turning I use little bit more strength, for finishing I'll go easy on the jaws.
Yes the machine I ran had an adjustable hydraulic 4 jaw chuck and using a dial indicator to sweep the part being careful not to over tighten and distort the part.
@@ChrisMaj Very good answer. After roughing and part has cooled and ready for finishing you will see how much it sprung when you indicate it for concentricity and flatness.
Quick spindle speed, or optical illusion?
Which cutting data you are used for this application?
Sir can you please make a video how to bearing outer side true on table 3600 please please sir
@2:20 TURN THE COOLANT ON!
I did use coolant. I'm just trying not to use it while recording the video or I'll get all wet.
@@ChrisMaj
You didn't get any 'chatter' in the finish?
@@stanervin6108 No
I like engendering work
Enduring*
Looks like GE segment ring that i used to machine
Hey guys how are you. Where are you from
Greetings, can you please send me your tapping program, I operated CNC vertical lathe so I would like help with cancelling instructions for drilling and tapping program
👍👍👍👍
Thats fast cutting speed....big time!
Whoops...i took 10 mm to much off the the job....
Sir please can you halp me how to create vtl turning program
The drill rpm can increase ?
How long it took to be finished?
IMO about 20 hrs.
I work with a VTL too, with a 4 meter plate
i run is vmc mahcine 1600 mm×800mm fanuc control
What is it for? Tank turret?
Like the big stuff good vid
Unbelievable!
Did that kind of work for 20 years and trying to find out if there are any positions in ct that are interested in hiring me
I would just be thinking what happens if tap breaks in last hole.
Something that big and time consuming probably spark erode it out
مشكورين .. لكن !!؟؟ ماالفائدة من تركيز الصورة على المشغولة فقط ؟ نريد ان نتعرف على الآلة ونوعيتها والمعايرة وطريقة العمل ....
هده الآلة خراطة أفقية.ليس مهم نوعية و البرنامج اشغلت في ماكينات مختلفة و برمجتها مختلفة.لكنهم تقريبا يتشابهون .الفيديو يريك تقنيات العمل . كيفية تحكيم القطعة.
I have observed vtl in industries . But willing to do it myself.
What brand and model of the machine is this Chris?
Yama Seiki GV-1600M
I have a job I rigid tap a 1-8 tap, what Ø do you drill the hole?
7/8” or .875 inch.
After breaking a few large taps in my career I'm literally scared of rigid taping.
Don’t check a tap drill chart, whatever you do.
Nice but I think it is more depth at roughing possible.
i love big toy,s