Finishing the Compound Acme Lead Screw
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- čas přidán 8. 09. 2024
- We will finish the machining on the new acme lead screw for the American Pacemaker lathe, in the video focusing on the two keyways that need to be milled in it, one being a Woodruff keyways. I'll share some info on Woodruff keys and how to gather technical info on them. This will finish up the new lead screw and from here we'll move over to the new acme nut that needs to be machined to match the new screw.
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Its funny I used to look forward to regular shows on the TV. Haven’t watched television in many years now I look forward to Abom79, Keith Rucker, Blondehack, etc.
I have 336 channels subbed.👍
Blondihacks posting every Saturday is sooooo good, I’m always looking forwards to her next video lol
I am in same boat, might watch a race or record 1 show. Have you watched cutting edge engineering?
You are not the only one man , I love this machinist master ! 🇵🇹🇵🇹👍✌
Same
My great uncle became a tool and die maker after he returned from WWI. Even though he never smoked there were always cigarette rolling papers in his toolboxes. Apparently they're 0.001" and that's what he would use to set tolerances. So that paper trick brought back some cool memories.
It's awesome that after all these years, Adam still takes the time to explain the basics for newbies, new viewers, etc. Dedication to the art of teaching, as well as that of machining.
Cant just have people cracking on and intimidating the newbies! If people are wanting to get into this then they will need help with it
It's amazing that all the calculations in that book were done with a slide rule or by hand before computers.
Not to mention half of the USA was engineered with them.
I really appreciate you getting the machinists handbook and walking us thru the process. I learn so much more when you do that. Thanks
I don't own any of these machines, maybe never will. Never seen anything more than a drill press in person, but after all these years I still enjoy your videos, Adam.
CZcams is funny like that. I also like to watch people digging with heavy equipment as well as people unblocking clogged storm drains.
You're 110% correct about still using variations of the paper method on cnc's lol if it works... it works.
Beautiful work! You were talking about old school ways of doing things, I'm actually an electrician and took a job at a machine shop with a major pay cut all to learn from a 79 year old master machinist. So worth it, that old man has shown me more in a year than I would have learned from others in several years.
We are indeed still using the paper method on CNCs. I do this every time I setup a new job and have to teach a tool zero in X and Z on a lathe (with the spindle off though), just moving the paper back and forth until it snags. Also, I find that when I mic printer paper, it's typically .004 thick, whereas notebook paper is typically .003 thick, and notepads vary from .003-.005.
And the cigarette paper we used in machine shop in the '70s was ~.001-.002. ;)
You are an incredible wealth of information. A real connection to the old school. This is a critical link you are providing for society. Thank you sir!
I been operating this kind of machine for 12years but sudenly stop and now become a gardener...but every time saw your vedios..i remember all my experiences before..i miss this machine man...God bless
I remember an incident that happened back in the mid-70s. Holy hell broke loose when the plant superintendent where I was working found Zig Zag cigarette papers in a couple of guys toolbox’s, turned out they were using them to set up the machinery they were running. I guess he never attended shop class
Adam, I used that paper method for 30 years as a toolmaker. A fellow toolmaker told me to use the plastic wrap on a cigarette pack, it was only two thousandths thick. Worked great for me for years. Thanks for the videos.
So excited to see the compound nearing completion. 😎😎😎
I gotta dig out my old Machinery Handbook... No idea what revision it is but I bought it in 1975. I was never a machinist, nor did I ever play one on TV. But the book is so full of standard dimensions that anyone who does any precision work at all really should have it.
As all great craftsmen do, you make it look easy, Adam! Great job and neat video!
They are available free in PDF form if you can live with the digital form!
I love this content. Seeing how parts are machined one-by-one. I worked in the Oldsmobile factory, using a power press, to shape cold sheet steel. My future wife worked in the Engine Building. Our buildings shared a wall. It was amazing to see the machines which cut metal like Adam does. Grinding castings into crankshafts and camshafts. This factory made 560,000 engines in one year. That is _not_ an exaggeration ! Management posted the numbers on a huge sign on the wall. GM was making one engine ever 40 seconds in that factory. So seeing Adam work is just a wonderful contrast to my memories.
It's a genuine pleasure to watch an artisan at work. Thanks for the great explanations.
Really grateful for your instructional patience. My father left me boxes filled with end mills, most of which I had no clue on their uses. Thanks to you I am slowly learning. Much obliged
I'm mostly running a '97 cnc 3 axis vertical mill. I have used the paper touch off to set up a quick repair.
Who came up with the idea that was "dangerous" ? Surely not a machine user, maybe OSHA newbie.
Looking forward to some heavy turning on the pacemaker!
I absolutely used paper every time I was setting offsets on a cnc.
I run several large CNC mills and I still touch off with paper in some situations instead of using the probe.
its great to see your videos back to what you do best
Being a 22 year old home machinist, the paper trick is one that my shop teacher showed me in high school and I use it almost every time I’m on the mill. Nice seeing other people using the same old school methods.
Thanks for sharing! I could see the spiral cutting looked very very smooth and very even, and the lathe sounded very happy with the camera mounted to the cross-slide it’s like a stethoscope. We can hear things you can’t, well until you watch it too. You were trilled and excited and I was on the edge of my seat “just a little more to go!” “Don’t grab and rollover”
Love these types of videos that you make when You reference the machinery hand book and go through your process and show us exactly how you accomplish what your doing, it helps us new comers out so much. Thanks again for another great video, leadscrew is beautiful 😍!
Years ago I was vacationing on Long Beach Island, NJ and spoke with a surf fisherman. He turned out to be the SKF president. I had relied on SKF for years along with other quality bearing brands. I felt honored to chat with someone that knew the bearing industry and regularly supplied parts for my daily machinery repair work.
Adam is taking us on a rebuild journey that meets the requirements of the American Pacemaker rebuild, but is not ultimate for drive train accuracy. I will be interested in his final assembled backlash result. I expect minimal backlash.
In a manual machine, backlash is compensated by loading the drive train in the same direction as cutting pressure. Manual machine application of this design can tolerate a shocking amount of backlash. 6200 series bearings are not precision and provide minimal thrust load compared to other bearing designs, but is completely sufficient for this application.
I am interested in the nut fabrication process. As a repairman, I simply relied on OEM replacement parts for this type of repair as our production shop couldn't/wouldn't justify shop time to machine this screw and nut. Our Clausing Colchester lathes used a split nut that allowed screw/nut backlash control. Adam's AP design relies solely on machining tolerance for controlling drive train backlash.
Even with a split nut design, I was surprised to see how fast the steel lead screw wore compared to the soft lead screw nut. Screw/nut backlash control was limited after the screw wore. Wear is always more in the center of lead screw travel. When I started machine repair in 1982 you could expect Clausing Colchester to supply you a replacement but or screw. Later, they would only supply the lead screw and nut as an assembly, even when the design included the adjustable split nut design.
In the production shop environment, machine downtime for repair justified OEM replacement parts and premium parts cost. Adam is taking us on a journey that our shop rarely attempted. We production machined to much closer tolerances than this AP repair requires, so capability wasn't the repair primary driving force. In my retirement hobby shop, I expect to do more of this type of repair work than I did in my production repair career. I can't justify OEM parts expenses and I want to use my repair demands to give opportunity to refine and hone my lacking machining skills.
In the production shop, every day long repair shut down three production shifts and tied up another machine to fabricate a replacement part. These factors made OEM parts replacement viable and relied on the manufacturer to meet manufacturing tolerance specs. Kudos to Adam for attempting to make these parts. He probably has little manufacturer specifications information on the old AP. I don't even know if OEM or equivalent parts are even available. I have repair skills, but lack required machine skills. This content increases my learning curve.
The original lead screw was square thread. The new one is acme thread. That is why he hand fitted it.
@@russellstarr9111 Gotcha! I don't know advantages of either of these threads over the other. I probably don't even distinguish between them and call them both acme.
@@paulhunt598 Acme is stronger and easier to machine.
It is difficult to quantify just how much this retired EE enjoys this channel. In the early days of my 35 year career we had a machine shop on site. Having the need to visit that shop was always a highlight for me. They were always willing to knock out a one off tool that made our jobs in the lab a bit easier.
I'm a retired sparky but find his vids very interesting and he never cuts corners. Worked in a 65 man maintenance shop that doubt if more then 5 of the guys could cut wood ruff keys 180 degrees apart on one of the two horizontal mills they had. Did a lot of electrical work in machine & tool & die shops and he has more tools & accessories then 3 to 5 man shops. He's doing a terrific job on setting up his new shop.
Only a machinist understands how Adam gets so exited about a thread, just happy it worked so well on the second attempt.
I appreciate the thoroughness, where you took time to explain the whole process, including from the Machinist's handbook
Can confirm I am still touching off tools with paper on our older CNC lathe without a probe
The finish on that is amazing.
Old school paper trick? = old school brilliance! Those old timers knew far more than we know today!
I used to to use a cigaret paper to get the cutter close to the material. 👍🏻
Speaking of old school, I would love to see some pictures and hear some stories of your Grandpa and Dad from their work back in the say. Stuff like cool projects they worked on, worst accident they had or saw, or any memories of the past.
I really like your videography and explanations.
Be safe. Live long and Prosper. 🖖
Adam you did a great job of explaining how and what you were doing in this video. Love your channel!!
Great close up views.Thank you.
Ain't nothing like a Monday morning Booth machinery lesson...yall take 'notes' this guy is the real McCoy
The Machinery's Handbook is what we called the bible in the tool and die industry.
Glad you are almost finished with this part of the repair. Have a great 4th of July. I am going to put something on the grill when it cools down some.
Thanks Adam. Really enjoy your videos. I just turned 64 and just started a couple of years ago trying to learn some machining skills after retiring from my electrical contracting business of 42 years. Those who say you can't teach an old dog new tricks, I hope is not true. Again thanks for all the learning tips. Chet
I turn 64 in November! This old dog learns new tricks all the time! To add to my collection of tricks from HS shop all the way through a 40+ year career as a Mechanical Engineer (with a LOT of automotive fun along the way).
Rite on there is hope.
Great looking part Adam. Always enjoy watching you work and your sharing of the tricks. Thanks very much for sharing.
A very good video with lots of detail and excellent lighting. I especially appreciate the close up still photos at the end. A big Happy 4th. to you and Abby from N.C.
I want to thank you for all the videos you have recently produced. I always find your videos very interesting and sometimes timely. Being a hobby machinist I'm always learning. It's great to have a Professor like you. KOKO!
The lead screw looks great. I am looking forward to the lead screw nut build using the multi-stage tap on the flex-arm. Thanks for sharing.
Nice job. I'm not a precision professional machinist but when I did make my cross slide screw and nut for a South Bend I restored I left it just a bit on the tight side and then lapped the screw and nut in with fine valve grinding compound and polish for a couple or 3 thousands backlash. I do that on many of my threading jobs that I want smooth action even with standard clearances.
Oh yeah. Can’t wait to see that nut machined and seeing the whole compound reassembled. Love this content.
Agreed. Hurry the fuck up Adam 😁😊
Adam - That shaft is Metal Jewelry for sure. Well done!
Nicely done Adam! I appreciate the level of detail you include in your explanations.
I will never have chance to use any of this knowledge you are sharing but it sure is fascinating
Great how you pulled the whole machining process together with the specifications out of the machinist handbook. Most videos will skip over those small details that are vital in machining components to industry standards.
I'm looking forward to seeing the American Pacemaker making chips!
It's interesting how this component is turning into its own video series like the shaper.
Then again, this is the piece that principally contributes to all of the lathe work, so it has to be right and precise.
Beeing from Sweden I'm happy to see two other swedes in your video!
Thankful for videos like these, Adam gives a thorough explanation of the process at hand.
I use the paper trick every time i print a part on a 3d printer to calibrate the deck - though I use tracing paper which is around 0.04mm/1.57 thousandths. Works great.
Adam: “Hopefully you’ll be back for some more content”.
Me: “Pfft, hope you won’t keep us waiting”. (I’m not saying we wait long for your content. I reserve those type comments for @This Old Tony.)😁
Beautiful! First class job again Adam.
Thanks to the man with the biggest SMILE on youtube...Loved the video....Shoe🇺🇸
You're right at the same spot in that rebuild where I'm stuck at the moment! Beautiful threading!
I'll just start by saying I'm not a machinist and I don't have a Machinery's Handbook, but my B.S. is in math so I was comfortable following the various computations. From Adam's Post-It note at 16:38 in the video it looks like the actual tolerance for the key height is +/- 0.005, not +0.005/-0.000, and that seems to be what page 1000 of his handbook also shows (it's a little blurry in the video). So, the measured key height would appear to only be 0.001 below spec, not 0.006. For this application that certainly seems like an acceptable result.
Also, I think I understand why an initial flat is cut before cutting the slot, since I'm guessing it's a more reliable reference for the measuring the final depth, but it made me curious about just how much of a difference there is from that flat to the original diameter of the part. Some quick math using the dimensions mentioned by Adam (it's just the Pythagorean Formula based on the thickness of the cutter and the diameter of the shaft) says that cutting the flat perfectly would have removed right about 0.011 of material from the shaft. Given the tolerances involved I just have to assume the Machinery's Handbook factors in this sort of thing in their various tables, since that's partly why it would be such a useful reference.
Thanks for showing us how you determine the various values you use in your work, Adam! It gives me a much better appreciation of the challenges of accurate machining, and occasionally makes me dust the cobwebs off my old math brain.
didawso....For what it is worth and if you are really that interested, the Machinery's Handbook is available online in a free PDF format.
@@paulcopeland9035 Thanks for the info - I'll check it out.
Thank you as always for sharing.
I'm just learning (again, and again)...and walking up to the lathe/mill feels like I've been there before just because of all the stuff you've shown. Gotta make a pulley for a sewing machine and it feels ...easy. Big machine to be respected but not feared.
Bravo Keyway
The paper trick is what I was taught in school, in 2018. We only had manual machines
Thanks for the reference to the tables, that will help down the road. I enjoy watching your videos then going to machinery class and connecting what I saw with what I can do. Thanks!
Happy Independence Day!
I work @ SFK I really Appreciate you showing the boxes they came in
He used SKF, not SFK typo ?? :-)
You work there and don’t know the name of the company?
We use large onion skins as dead mic ‘paper’, it’s one less thing to waste that we already have on hand here on our little farm.
You should make a collet block set for a channel give away. One of those tools, like a good m,aching vise that never falls into budget.
By the way-our shop lathe that we bought a few years back is that same PM lathe! It is affordable and perfect for a small farm keeping very old machinery running!
I do The exact same trick with the paper when I operate our old flatbed router.
i still use paper on cncs to touch off one tool. I'll only use a tool setter or indicator If im using multiple.
I still do it on my CNC on occasion. More often than not.
Very nicely done with all the information. Thanks as always.
Back in the '70s in machine shop we used a cigarette paper! ;)
Great job Adam! Another satisfied customer!
Nice job on that lead screw. I would say that might work better than factory.
Great to see a plan coming together like this! Thanks Adam!
Trabalho incrível!!!
Abraço do Brasil a todos aí!
Good stuff
I have used machined parts for years. Having takened geometry, i now "see" how things became since the 60's of my work life.
Very well done. Wears his passion on his sleeve. Thouraghly enjoyable.
Yes, use paper trick on CNC
Now I understand thanks
I'm no machinist but you're just fun to watch. I am learning so much and one day I will own a few machines.
Thanks for sharing and Happy 4th!
fantastic work Adam
Lovely part Adam, looks fantastic.
I have to try that paper thing next time. I used feeler gauge but can see how that would not be as accurate. But then i'm a hobby machinist too.
Just remember use a long piece of paper and TURN IT LOOSE...
You an easily CAD up the distance from touch to flat, this is useful for lots of things!
Woodruff cutters, in my experience measure and cut larger than advertised diameter......
Also can calculate it with the calculator app on the phone if there's no cad handy
Have a good fourth of July hope you are doing some grilling
Very big variation of the page numbers between editions
My book is the 22nd edition and I am showing 1615 and 880
For the same information
Good call Adam
21st Edition has info on different pages to both your book and Adams book.
@@slypig24 obviously a difference between editions
They either added or subtracted information
Machinery’s Handbook, 31st Edition is the latest
i don't think i've seen anyone else use the paper method of finding zero since i was in the tool and die program at Algonquin College in 2007, with Jim Standing, who had learned machining there, became a career machinist, and then went back to teach machining, became head of the program.
Great job on the screw and features Adam. Since this has turned into a fairly lengthy project, it may be a good time to discuss other options for viewers that are not setup with your machines and experience. I notice that Roton has 3/4 -5 left hand lead screws for $14.00 per foot, and a 3/4 -5 left hand bronze nut that could be bored and pinned in place, for $36.00 . It seems as a good viable option for us less fortunate!
While you're at the price lists, how much is an old Pacemaker lathe that might need this?
That handbook represents a ton of history and work. Wonder what a first edition is like compared to the latest.
You and yours have a great 4th, Adam! Super nice threading on the lead screw. I've never seen better.
Yes, I sometimes use the paper trick on CNC but with 0.1mm brass
Thanks for the video.
Lookin good Adam.
Adam, thanks for the detailed instructions. You and Abby have a happy fourth.
GREAT VIDEO...
Awesome.. Must feel good to have that job done. Looks like the PM lathe is going to be an awesome work horse !