Finishing the Compound Acme Lead Screw

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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[@transmaster]

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.

[@tomahoks]

I have 336 channels subbed.👍

[@marioghioneto1275]

Blondihacks posting every Saturday is sooooo good, I’m always looking forwards to her next video lol

[@paulmitchell6710]

I am in same boat, might watch a race or record 1 show. Have you watched cutting edge engineering?

[@tiagopires1419]

You are not the only one man , I love this machinist master ! 🇵🇹🇵🇹👍✌

[@chadwilcox1077]

Same

[@DavidHerscher]

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.

[@connahjones8178]

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

[@mungtor]

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.

[@paulkelly1702]

It's amazing that all the calculations in that book were done with a slide rule or by hand before computers.

[@Garth2011]

Not to mention half of the USA was engineered with them.

[@rexmyers991]

I really appreciate you getting the machinists handbook and walking us thru the process. I learn so much more when you do that. Thanks

[@Sizukun1]

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.

[@hgbugalou]

KZbin is funny like that. I also like to watch people digging with heavy equipment as well as people unblocking clogged storm drains.

[@dayanangarden5065]

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

[@pacificnorthwest9416]

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!

[@SteveInPalmSprings]

It's a genuine pleasure to watch an artisan at work. Thanks for the great explanations.

[@bobbyvance6622]

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.

[@tomoakhill8825]

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.

[@joezaloga]

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

[@peterhodgkins6985]

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!

[@paulcopeland9035]

They are available free in PDF form if you can live with the digital form!

[@GrassBuffalo]

So excited to see the compound nearing completion. 😎😎😎

[@unpob]

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

[@brandenbenevides304]

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.

[@apistosig4173]

Old school paper trick? = old school brilliance! Those old timers knew far more than we know today!

[@garbo8962]

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.

[@bulletproofpepper2]

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”

[@bobastill8538]

its great to see your videos back to what you do best

[@joshwelch8288]

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 😍!

[@1Handedlevel100]

I absolutely used paper every time I was setting offsets on a cnc.

[@paulhunt598]

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.

[@russellstarr9111]

The original lead screw was square thread. The new one is acme thread. That is why he hand fitted it.

[@paulhunt598]

@@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.

[@russellstarr9111]

@@paulhunt598 Acme is stronger and easier to machine.

[@smc4229]

I appreciate the thoroughness, where you took time to explain the whole process, including from the Machinist's handbook

[@JayKayKay7]

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. 🖖

[@Ddabig40mac]

I'm mostly running a '97 cnc 3 axis vertical mill. I have used the paper touch off to set up a quick repair.

[@Garth2011]

Who came up with the idea that was "dangerous" ? Surely not a machine user, maybe OSHA newbie.

[@k4x4map46]

Ain't nothing like a Monday morning Booth machinery lesson...yall take 'notes' this guy is the real McCoy

[@nashguy207]

Adam you did a great job of explaining how and what you were doing in this video. Love your channel!!

[@Copenhayden]

I run several large CNC mills and I still touch off with paper in some situations instead of using the probe.

[@commonsense7924]

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

[@PhilG999]

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).

[@commonsense7924]

Rite on there is hope.

[@patrickcolahan7499]

Great looking part Adam. Always enjoy watching you work and your sharing of the tricks. Thanks very much for sharing.

[@from-the-land-of-noah]

Adam - That shaft is Metal Jewelry for sure. Well done!

[@MichaelJohnson-jt5cu]

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.

[@a.bakker64]

I used to to use a cigaret paper to get the cutter close to the material. 👍🏻

[@angelramos-2005]

Great close up views.Thank you.

[@ronnydowdy7432]

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.

[@ellieprice363]

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.

[@DisVietVetUSA]

Bravo Keyway

[@johnferguson2728]

Nicely done Adam! I appreciate the level of detail you include in your explanations.

[@billabernathy1541]

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.

[@nancyp3949]

Oh yeah. Can’t wait to see that nut machined and seeing the whole compound reassembled. Love this content.

[@MrBillUp]

Agreed. Hurry the fuck up Adam 😁😊

[@RichlundTube]

Beeing from Sweden I'm happy to see two other swedes in your video!

[@b-lazr5126]

Thankful for videos like these, Adam gives a thorough explanation of the process at hand.

[@tomcarlson3244]

I will never have chance to use any of this knowledge you are sharing but it sure is fascinating

[@fyrman9092]

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.

[@hanscarlson2199]

Beautiful! First class job again Adam.

[@jasonconley2310]

Happy Independence Day!

[@ponga782]

Great job Adam! Another satisfied customer!

[@Airtight215]

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.)😁

[@tonyc.4528]

You're right at the same spot in that rebuild where I'm stuck at the moment! Beautiful threading!

[@felixar90]

The paper trick is what I was taught in school, in 2018. We only had manual machines

[@frollard]

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.

[@jamesorear819]

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!

[@mdvener]

Very nicely done with all the information. Thanks as always.

[@viscache1]

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!

[@carldawson5069]

I have used machined parts for years. Having takened geometry, i now "see" how things became since the 60's of my work life.

[@billboy7390]

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.

[@cozmium]

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.

[@jakejones9502]

Nice job on that lead screw. I would say that might work better than factory.

[@rodneywroten2994]

fantastic work Adam

[@irishpotatogamer1850]

Lovely part Adam, looks fantastic.

[@djdawso]

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.

[@paulcopeland9035]

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.

[@djdawso]

@@paulcopeland9035 Thanks for the info - I'll check it out.

[@heardashot]

Very well done. Wears his passion on his sleeve. Thouraghly enjoyable.

[@toms.3977]

You and yours have a great 4th, Adam! Super nice threading on the lead screw. I've never seen better.

[@ÁREAJ27]

Trabalho incrível!!! Abraço do Brasil a todos aí!

[@PhilG999]

Back in the '70s in machine shop we used a cigarette paper! ;)

[@geoffreywheatley7711]

I do The exact same trick with the paper when I operate our old flatbed router.

[@davesdrone3125]

I still do it on my CNC on occasion. More often than not.

[@lumotroph]

No views! That’s cool. I thought you were so famous that uploads got 1000 views immediately on principle 😁

[@CraigLYoung]

Thanks for sharing and Happy 4th!

[@johnrummel6154]

Who came in the shop during the last video!?!?!?!

[@tomnugent845]

Adam, thanks for the detailed instructions. You and Abby have a happy fourth.

[@iceowl]

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.

[@seancollins9745]

Yes, use paper trick on CNC

[@rogerscottcathey]

That handbook represents a ton of history and work. Wonder what a first edition is like compared to the latest.

[@jimliechty2983]

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!

[@paulcopeland9035]

While you're at the price lists, how much is an old Pacemaker lathe that might need this?

[@lokkie67theshed82]

Nice job Adam, looks great that woodruff key job

[@joewhitney4097]

Lookin good Adam.

[@SirFlibbertyJibbit]

i still use paper on cncs to touch off one tool. I'll only use a tool setter or indicator If im using multiple.

[@Rheasound]

I can wat h for hours your job and really appreciate the time you take for explanations. Thanks for sharing.

[@anthonymarino4260]

Now I understand thanks

[@robertconklin3322]

I started watching this video within an hour of its release. By the end of the video the view count had over doubled. You've sure come a long way since the hand held camera videos at Motion. As always, Super enjoy your productions Adam. You have a huge fan in Huntspatch AL. Cheers & happy 4th.

[@romankoldeway5221]

When I just don't feel like grinding off the scale on my metal to get my probe to ignite I'll use some paper. Love the vid.

[@ferrumignis]

Happy Independence day Adam. Looking forward to seeing the Acme nut being machined, it's a job I've been putting off for a while on my lathe.

[@Jameson4327]

Thanks for the video.

[@kateristrobel2022]

My husband that is originally from the DR always tell me that big guys can"t be careful, so I use your example for him to learn being careful and organize. Yes big guys can be careful too. Thank for your Videos.

[@kevindavis6042]

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

[@slypig24]

21st Edition has info on different pages to both your book and Adams book.

[@kevindavis6042]

@@slypig24 obviously a difference between editions They either added or subtracted information

[@Garth2011]

Machinery’s Handbook, 31st Edition is the latest

[@gentharris]

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......

[@MF175mp]

Also can calculate it with the calculator app on the phone if there's no cad handy

[@catfishgray3696]

GREAT VIDEO...

[@MastGunWorks]

That’s exactly how I did it on my Tormach before I had a Hymer

[@mikepayne5032]

Have a good fourth of July hope you are doing some grilling

[@passenger6735]

I made it 3 thou too deep, but who cares. That was a very good looking part Adam.

[@Narwaro]

Yes, I sometimes use the paper trick on CNC but with 0.1mm brass

[@michaelweatherhead9470]

Thanks Adam great video.

[@can5projects563]

You are like a book of knowledge I Love your Videos

[@weijingburr2392]

The cutter chart is on pg 869 and the Keyseat chart is on 2496 in the 30th Ed. Handbook.

[@wolfhausindustries]

You're 110% correct about still using variations of the paper method on cnc's lol if it works... it works.

[@johnz8210]

That came out great. Thanks for the videos.

[@KG4JYS]

You should consider getting a cheap 10x microscope. I have one for electronics work, but they would work perfectly to show fine stuff on video such as how nice those threads came out. Since you wouldn't need to actually work under the microscope you could probably get a suitable monocular scope for like $30 or so on amazon.

[@brandonvarney7258]

It would be really cool if you could use gauge blocks or a calibration fixture and check the " Actual " movement of the lead screw. Once you get it back together. Most acme "precision" lead screw i buy is .001" a foot.