MACHINE SHOP TIPS #23 Internal Threading on the Lathe tubalcain

[@noneofabove5586]

This video taught me how to use my lathe to cut threads. I had owned the lathe for about 15 years and could not figure out the proper procedure. This was the beginning of my you tube learning ! Thanks Mr. Pete.

[@mrpete222]

Glad I helped

[@luv2ski80007]

If youtube had an award for giving back selflessly you would be my nominee. Thanks so much for what you do. I can tell you enjoy it and we sure do benefit from that as well.

[@EvanLightner304]

Mr. Pete thanks for the refresher. 10 years a machinist but don’t do much internal threading. Have a job today I have to thread. 12.75-8 tpi internal. Have been watching your videos since I was in high school😀

[@mrpete222]

👍👍👍

[@elliottsmock3680]

I have been watching your videos for many years. Yesterday I cut an internal thread using this video and got a great result! Thank you from the UK Lyle!

[@mrpete222]

Fantastic!

[@curtwarkentin2887]

I will admit I especially loved how you showed your hands turning the handles on the lathe as well. perfect way for me to learn. Thanks a million for the awesome videos. You truly are an excellent teacher sir. Many thanks for sharing so much of your knowledge.

[@mrpete222]

+Curt Warkentin thanks for watching--you are the first out of a quarter million to appreciate the hands!!

[@chuckthebull]

I also appreciate the hands..... it makes it all make sens, i had the ah ha moment.. When i started on my craftsman lath this was the video i learned to make my first thread and it was so satisfying and actually fun to time everything...I had no stop mechanism and i think i watched the other one you posted with the thread dial method...I concur with Curt...You are an excellent teacher and enjoyable to watch and listen too. Thanks for making these great instructional's to keep these great skills alive and passed on..

[@mrpete222]

Thanks so much for watching--glad they helped you

[@timmer9lives]

The hands on video clip brings it all together. No doubt about it.... Mr Pete’s videos are the best instructional shop videos on KZbin. Sure...once we get more skilled, other great videos show fantastic tips. But I don’t do a lot of internal threading.. And every time I need to make another nut, I come back to this video. About the third time I’ve watched it in 2 years.

[@hooligan1717]

I'm a toolmaker who's retired from the trade now but I have to say that your videos are the best I've ever seen. Other than the pattern-making and foundry work, I am very familiar with all the topics you've presented and I have to say that your explanations are excellent: clear, precise, and down-to-earth. I certainly would've appreciated that style as an apprentice!! I'm guessing that there are many college instructors who recommend your KZbin "classroom" as extra help!!

[@70CarStall]

39 year old manufacturing/fabrication experienced guy here going to school for machine tool technology. 1st year consists of manual machining where this gets me even more familiar with the techneques and operation of lathes as well as mills and other things. I just stareted on the lathe a few weeks ago and its very usefull seeing these videoes. Only thing is tubal cain? Cain is the bad guy, you seem like a good guy.

[@JMaSsA11]

Hi Tubalcain! Thank you so much for all your videos! I am a novice. I worked for a tool & die shop for two years when I was in my 20's. I really enjoyed the shop and thought I'd stay with it, but I turned to the plumbing & heating trade after the company went out of business. Now in my mid forty's and I realized how much i missed working on the Lathe and milling machines after watching your videos. you are a wonderful teacher and I have the most respect for you and your work! Your the Best! Ken

[@jimbrady1776]

Very nice, thank you. I am reminded of my metal shop teacher 40 years ago. Been a while since I did internal threading, but am about to head out to my shop and give it a refresher.

[@BazookaMoose]

Good steps, better camera placements. Thank you for showing what you do with the machine to get the cuts, it helps a lot when you want to get into Lathe work, and no schools are near you or lathes to use for practice.

[@ch408w1]

I learned a valuable lesson tonight on my new 13x40 Enco.... had a PVC like you have there and wanted to practice on imternal threading.... I set my stop....didn't realize that it wouldn't stop the clutch and first pass when it hit the stop, it broke the shear pin in the threading shaft.... enough for one night... I know next time to not go all the way to my stop with the half nut engaged.... nothing is more valuable than experience !!!!! Thanks again for all the tips and lessons !!

[@jessehart05]

Wow. I have had a lathe for about 5 years now and never knew the right way to thread parts. This is very helpful and I will now be able to make the parts that I need. Its really hard to find guys like you that have so much know how and information. Do you mind if I call you the Grandpa I never had? lol. Thanks

[@josephpetito9718]

Gotta do this today, starting with pvc like you did (will need to make some mistakes!) and then go to the real deal. Need to make a pulley with internal threads and a keyway, with a threaded setscrew. It will be for one of the large old Grizzly belt/disc sanders. If I put in a work order for the school district guys to fix it, they'll put a BER (beyond economic repair) tag on the thing and then haul it away. Thanks for keeping the older videos accessible! The next one I'll watch is making a keyway on the lathe! Joe.

[@HDakash]

Sir, your videos just get to us. They are amazing. First of all the kind of detail that you provide is simply great. Secondly whilst watching a video on KZbin the only problem that arises is the doubts that remain unresolved. But the way you explain each and every thing with patience and diligence, their can be only one word for you "RESPECT" !

[@BigAgitator]

Back when I was learning single point threading, I practiced a lot on PVC pipe. I got pretty good at it. Once, I was rough turning under power feed. At the end of the pass, I disengaged the feed and the carriage took off towards the chuck, crashing the lathe almost instantaneously. I reacted quickly & nothing was damaged. Turns out the round nose tool dug into the plastic so ferociously that it drove the carriage towards the chuck, all the while, cutting a corkscrew pattern into the pipe.

[@ginsboy2003]

Awesome job on the video, I need to watch the rest that you have. I'm self taught for what little I know and have yet to cut a thread. I have made a bullet mold though and have videos on that.

[@AkGrayWolf]

Thanks again for your videos, they have been invaluable to me since I never had the opportunity to take classes. I love your new camera, it makes your videos even better. Thanks.

[@rollerco]

I really appreciate all the effort that you do to make these videos. It really has helped me a lot in developing my own skills. Once again thanks

[@tynado1173]

This video was just the right amount of "dumbed down" for me. Thank you for your knowledge

[@FraktalsFestiVids]

Great video mrpete222 I had some questions about internal threading and this cleared up most of the process in a single video. I'm still foggy, but this definitely helped.

[@reconteamohio]

Really loved this because of the hands. It communicates the actions needed in a very clear fashion. It was if I was one of your students right there in the shop class! awesome job, and thank you so much for making and posting these videos! BTW the red dye works very well on my old eyes!

[@mrpete222]

Thanks for watching

[@47marwynne]

Thanks for the video. Have done some simple projects first one with the internal threads. Thanks from a retired electrician.

[@mrpete222]

+marwynne kuhn Thanks again

[@matt4925]

Once again , a very informative and well shot video. I really like the new hd camera. Please keep all these wonderful instructional videos coming. The test segment of your last video was really a good idea. Please feel free to work quizzes into any of your upcoming videos...Thanks..Matt

[@Brute4rce1111]

this was extremely helpful, I screwed up my first piece but after watching this, I know now what I was doing wrong. Thanks!

[@toddclites]

I researched the Harbor freight model I bought and it got pretty good reviews so I can only assume it was machined properlyMy tool are high end ones I bought from a machine shop.I did watch your centering video but I still need to purchase a piece of good round stock to go through the process. Thank you for replying.

[@rickhelsel5355]

Nice job . Instructions simple and to the point. Will see more of you. Tks

[@DejaveauxSteve]

Great info! I just got my Atlas Craftsman 12" up and running and look forward to watching more videos.

[@terrymoorecnc]

Internal threads on an engine lathe are normally cut from inside to outside with the spindle running in reverse and the compound set in the direction of the cut. In the case of a CNC turning center where you can thread from the inside to outside and stop precisely it is normal to thread so that the spindle doesn't reverse when other ops are machined.

[@randr10]

Some of these shots are awesome. I was paying attention on your last pass and I could see the lock lever on the Aloris moving up and down ever so slightly as the chuck jaws swung past the tool bit. Kind of wild that there's that much movement even with something that cuts as light as PVC. That Clausing lathe is no lightweight like an Atlas either.

[@mrpete222]

Thank you for the ENCOURAGEMENT.

[@turbinedoctor]

Great videos and like others have said I like the quiz on the last one. I have heard single point method used many times, are there other methods? Please keep the videos coming.

[@Metalunique]

Wow, nothin' like learning old school. Thanx for sharing!!

[@schoonymopar]

another method for cutting id threads. the only thing you change from cutting external threads is the tool is upside down and you cut on the back side of the hole.this makes it easier to see the tool cutting and it moves you hand away from the cut. the same method works for cutting tappers that need to match perfect just cut the ex. change to a boring tool and cut the int. with out changing anything else.plus you find cutting on the back side keeps the tool loaded and cutting better.

[@trailbusterbrute]

Your videos are awesome. Ever heard of a wobble broach for making square holes on a lathe? There was a guy who made one from plans in Model Engineer magazine (British publication) but the article is nowhere to be found. I'd love to see you make one of those!

[@darthcollosus]

I am an electrician and do mostly industrial work so I'm threading conduit all the time and we use npt and they are tapered threads. But maybe some of the stuff isn't tapered but I was aware of it

[@johnstrange6799]

Lots of great basics here to review. Thank you as always.

[@mrpete222]

Thank you for watching

[@mwroush]

Nice Job! Hiram Abif would be happy with your mastery!

[@jamiebuckley1769]

that was a great video but i wish you would have shown us how to determine depth of cut. some formula or where to find it in the machinery handbook.

[@BisdremisKostas]

lathe work looks so much fun

[@fordescort1800]

thats a very complex machine all those different mesurements to remember as well cant wait untill i get a lathe but perhaps ile get a beginers lathe thanks for the vid

[@rufusleers]

I recently made an edger shaft on my craftsman 12x36 lathe.

[@dduff9478]

Love your videos, many thanks. I have to do a internal 7/8 14 thread, about 3/4" long, but it needs to be down to the end of the hole - similar to what you would do with a bottom tap. My question is wouldn't it be better to run the lathe in reverse and thread out, with a LH boring bar? My Cincinnati lathe has a taper chuck mount so the chuck won't unscrew!

[@Disneymkvii]

Great vids! Can you explain why the compound needs to be set at 29 degrees?

[@m_a_s6069]

11-1/2 is a very common thread pitch, so many lathes have this setting. Mainly because 1", 1-1/4", 1-1/2", and 2" NPT threads have this pitch.

[@mrpete222]

Thank you, never thought of that

[@mrpete222]

If the lathe was machined inaccurately at the factory, there's probably little you can do. Did you alighn the centers as shown in one of my videos? Ther must be no wobble, slop, or looseness in any of the parts. Are your tools good & sharp?

[@drakkorvladimir4012]

GReat video, just not sure why the compound must be at an angle?

[@MrBobbyd45]

I would say sir that you have mastered the lathe.Did you work as a machinist for many years? I always enjoy your videos.

[@nerdyrcdriver]

I don't know if he was ever a machinist, but he mentions in some of his other videos that he use to teach a machine shop class at a high school.

[@mdlee1958]

I have found that on these import lathes the gibbs on both cross slide and compound come "pre-bent/pre-warped" (a thank you for your money from China). I solved the problem by removing both gibbs and peaning flat with a brass mallet and checking on a flat plate, then lapping the gibbs on a flat plate using 440 grit wet and dry with water and re-installing. Seemed to remove "most" of the slop and now can turn to withins +/- .0002".

[@MadmanDKDK]

Gotta say I like your videos, you're very informative and you give only the necessary details, I'm not a machinist but I'm still curious. On the thread dial - why do you have to engage the half-nut on specific numbers / lines depending on the thread you want to cut ? Why not just use any random line, and engage the half-nut on that line on every pass ?

[@mrpete222]

+Nicki Hansen That would work too. But a waste of time for the line to come completely around

[@MadmanDKDK]

I see, thank you. :)

[@qzorn4440]

sweet video... gee how can you do this without huge numerical computer? you make it look so simple while explaining the detailed moves... now to check the the thread table... thanks a lot...:)

[@mrpete222]

👍👍

[@bravotwoforty7434]

I purchased a used HB 7x10..yes I know its not the best or even close but I live on a very small Military disability and I buy what I can afford. I need to tune it up I have problems with it tappering when Im turning anything. I have wobble in the carrige.I either over tighten or its to loose. Oh should mention I'd never even seen a lathe until I bought this. Anoth proble I can figure out is how to get the woblle out of my material(mostly aluminum) I hope you can help get me straight,thank you!

[@tomherd4179]

I think I understand why the compound is moved to the left; so that as the thread is cut deeper the tool is pulled outward cutting on the tools leading edge. I think. I have seen youtube videos where the compound is set 30 to the right and internal threads cut. They appeared to be ok as well. Is this just 2 ways to do the same job, or is one much better that the other?

[@schoonymopar]

yes it works very well my lathe is a 1930's model. it's a pratt & whitney

[@danbreyfogle8486]

Another suggestion by You Tube and another interesting video. I am going to look for Tips #1 in honor to your Tips #1000 that will be coming up.

[@mrpete222]

I appreciate it. Thanks for watching.

[@hydropro76]

Great videos! I've learned alot from them. Thanks for sharing your skills.

[@rickymizell5137]

Thanks Mr Pete

[@_P0tat07_]

Why set the compound to the left? I cut my first internal thread this morning with the compound swung to the right at 29.5°, and it worked amazing.

[@4GSR]

You can do that on larger lathes. Get on a smaller lathe like a 9" or 10" lathe, the carriage will follow the previous cut and not necessarily cut the flank of one side of the thread, instead will be cutting off of both flanks of the thread. I generally keep my left hand on the carriage hand wheel and create a little bit of tension. This will keep the half nuts bearing against the flank of the leading thread on the lead screw. It'll keep the half nuts from "floating" on the lead screw when you don't have the compound turned correctly when feeding "IN" on the thread being cut. You have a lot to learn about cutting threads on a lathe. Listen to the shop teacher here! Also, I've been cutting threads on the lathe for over a half century. KenS.

[@_P0tat07_]

4GSR I’ve only cut 4-5 threads on a lathe as a student machinist. I’m getting there. I’ve only ever botched one thread because the threading lever wouldn’t disengage.

[@4GSR]

@@_P0tat07_ Don't feel bad, I've messed up my share of threads over the years, too. You're not learning if you don't mess up once in a while. Keep up with the good work. Ken.

[@_P0tat07_]

4GSR thanks bud!

[@Altcapball]

you said not to attempt internal threading of diameters less than an inch, but you didn't really mention what alternative one might have. I have some stainless steel rod I need to thread some half inch holes down the center, but since the rod is round its very hard to keep it held in place, nor can i find the strength to turn the thing as I get deeper if i can stop it from spinning in the vise. I've managed a work around for the time being but long term for my project I want to find an automated manner to thread these. Buying a lathe sounded perferable to me than buying a dedicated threading machine that only does one job.

[@mrpete222]

Are you using a tap? You need to use a very small boring bar to thread small holes. They always flex & are troublesome.

[@poolfool31021]

Sir, What do I need to ask for to get the threading and centering gauges from Starrett? How many in a set? Amazing instruction....looks like you just couldn't help teaching after school.

[@harleyghost]

Mr. Pete, Do you turn the compound feed to equal the thread depth of the pitch or do you need to calculate for the 30 degree angle?

[@bigblue1402]

Hi Pete. A quick question. How would you go about cutting a 5tpi thread internally. I'm thinking there must be a opposite tool as a 60 degree tip will only cut the female. Have a think and let me know . Cheers Dave in the uk

[@KatyLynnWinery]

I am wanting to buy a boring bar for threading. On the end that you secure to your tool holder should it have a flat surface to tighten better or can you tighten a round and it work fine? I see them made both ways. Thanks in advance. Truly enjoy your videos.

[@mrpete222]

The round will work fine

[@Jegan1984in]

Hello Sir, Reg. drilling a 30mm hole using a lathe tail stock. I would like to know whether a pre drill for a 30mm hole is must. FYI, it is a thru hole for depth 55mm and material is Mild steel and it is a mass production job. And also let me know the size of pre drill required. Thanks, Jegan

[@mrpete222]

@monstercatambush Thank you very much--comments like yours make it worth it all.

[@k1mgy]

After the first pass, how do you get the tool to meet the starting position of the thread for the next pass? This seems like a bit of precision that must sync up the rotation of the part quite precisely.

[@clintonmagee417]

Thanks for the video. It is helping me get my mind around a project I'm about to start. Can this same method be used for Glass or Stone? I'm sure you would need different boring tools for glass, I'm just wondering if this is possible. Thanks.

[@mrpete222]

I would say no

[@sammorgan31]

"screwed" lol, I know im not the first one to catch that pun in 8 months. Grind up a boring tool from an HSS blank to make the part. A little trick I like to use is to put the tool facing the back of the bore instead of the front. Run the machine in reverse and it will feed away from the headtsock, reducing crash risk. Of course infeed will be the same as cutting external threads as well. DO NOT DO THIS ON A MACHINE WITH A THREADED SPINDLE NOSE. This could unscrew your chuck.

[@2aklamath]

My smallest is 10-24 acme dual pitch for the Stuart Triple

[@mrpete222]

👍👍

[@mdeasy]

Great example! And very safe too.

[@WhidbeyOne011]

@70CarStall Not Tubal Cain - Tubalcain. Tubalcain was the guy who invented writing (or so it is said)!

[@PayneKiller23]

Hi, tubalcain, i have a question, if i am making a metric thread on the lathe do i need a thread chasing dial? or is there a different method?

[@MordecaiV]

Why does it matter if the compound is set forward or backward the 29 degrees? Isn't the cutter that you show able to cut on either face?

[@david667766]

You sound like James Whitmore! Great Videos!

[@mtnviper1963]

why do you advise not thread any internal thread smaller than 1 inch? Just use appropriate sized threading tool. Hi-Micro Tool corp. makes some very nice solid carbide internal threading tools. I would recommend a 45 deg. chamfer .015 over the major thread diameter before the threading operation and that would eliminate the nasty burr on the front of the thread. Also, it is not necessary to set the compound at 29.5 deg, as long as your tool it accurately ground to 60 deg.

[@MegaChekov]

it sure was helpful thanks again From John In Texas

[@waynebundza4019]

I could have read your written instructions, if I would have taken a picture of them and looked at my camera. how fast do you think you can read? Wayne

[@Just_D.I.Y.]

+Wayne Bundza I do believe that is a good use for the pause button, I appreciate that the video isn't stopped at the written instructions for any long length of time for those who don't need to read them and generally speeds up the video.

[@MrUbiquitousTech]

+Bob Sawatsky Exactly.

[@ch408w1]

I guess what I am asking is there a certain amount of thousands that you normally remove ???

[@mrpete222]

@CRF450Rider585 You can probably do it. But your boring bar & to0l must be pretty small.

[@ShaiHulud1982]

excellent information, as always!

[@mrpete222]

@PayneKiller23 Yes--you need one.

[@sriniification]

thank you.very useful for my exams

[@tomherd4179]

If you were doing Left Handed Threads would it be the same procedure except cutting from the chuck toward the tail stock? I have a SD 10K with a screw on chuck so I don't really want to run the lathe backwards, as a number of videos show with the tool upside down.

[@mrpete222]

Yes--from headstock toward the tailstock. watch this video---MACHINE SHOP TIPS #16 Clausing Lathe LH threading tubalcain

[@tomherd4179]

I went out in the shop Sunday and tried it with success, did both internal and external, on plastic as well. Thanks for your videos. I think I may like the Clausing more than my SB.

[@ch408w1]

How do you know how deep to cut the threads...internal and external ??? Thanks

[@mahocnc]

Nice...11-1/2 tpi is not odd ball, very common in pipe threads, [NPT] 1-1/4", 1-1/2" 1-1/2" and 2" inch have 11-1/2 tpi.

[@joesosnowski7568]

tubalcain, i want to internally thread aluminum tube with an id of 1.259 @ 24 tpi. what size do i need to turn down my solid round stock to in order to thread it externally for an end cap?

[@martyshrekster]

Which one do you need, internal or external threads?

[@poozor]

@bl0bl1bl4 I think he was watching the "thread chasing dial" which is shown at 6:48

[@venom5610]

Do all clausings have the stop feed function?

[@mrpete222]

I do not know

[@jbrunson1949]

Great videos, I have something maybe you or some that reads this can help with,, I have a Grizzly G4000, and want the thread a backplate to mount on it, it has M39x4 thread config. [ these are the lathe specs. for threading = Number of metric threads: 11,, Range of metric threads: 0.5-3.0mm] can you tell me if this g4000 will thread this backplate.. thanks

[@mrpete222]

+jbrunson1949 Thanks for watching--I'm going to leave that for someone esle to comment, I'm not familiar with it

[@michaeldoudjr6321]

jbrunson1949 this is probably a year to late but the short answer is no it won't. metric thread is really pretty simple. the first number 39 is the diameter. 39 mm. the next number is the peak to peak of the threads. so in your example 4mm from the peak of one thread to the peak of the next. Your lathe will cut threads from .5mm peak to peak all the way to 3mm peak to peak but not beyond. I hope that makes sense even if like I said it's. year to late.

[@CRF450Rider585]

Don't thread id smaller than 1 inch? i need a 14 mm LHT soulder nut....no one has it, so am i screwed or what?

[@MordecaiV]

@harleyghost just for the sake of clarity, Mr. Pete responded that it needs to be calculated, (but it wasn't a "reply" so it kinda got separated)

[@Krzys_D]

how would the half nut lever work with metric threads?

[@scotttipps8155]

Why do you set the compound to the left when threading internally?

[@MRmwr2452]

because internal threads are actually cut OPPOSITE of external threads. Think of it as a mirror image.

[@rajshah6429]

hi, how did cut the"figur eight" lubrication grooves in bronze bush in lath machine send me video please the figure eight may be reqired to distribute grease,send me method to maching to fiure eight

[@jimm2442]

Thanks again for a great video and my knowledge gained.

[@mrpete222]

Thank you for watching

[@jerrypeal653]

GooD material to practice on .

[@rodjava]

Hi mrpete At about 2:45 you mention a chart. Can you refer me to a similar chart that is online? I need to internal thread tubing 1.50 to 1.750 dia and need a reference guide showing major and minor diameters. Thank you in advance

[@TheDefeatest]

I'm confused as to why the compound has to be at 29degrees? and to the left?

[@larrymunday7519]

You are creating a merchant coupling, a true pipe thread is tapered in order to seal properly.

[@barrycass2820]

How many tractors do you own. Just wondering I know you one in you garage a long time ago. Thank for your time.

[@mrpete222]

2

[@sharky322]

i was working on lathe for 3 years. i find this work so boring :D but its useful