External Threading - A Beginners Guide

How to grind an Acme threading tool. How to cut 60 degree left hand and right hand threads. How to cut acme threads.

[@swarfrat311]

A great job, Prof. Halligan! I have seen a jillion threading videos, but no one has to taken the time to explain the "hows" and "whys" of threading. Being an analytical person, I thrive on knowledge. The more info I can glean as to the how and why, the happier I am! Grey areas make me a little crazy! But in simple, easy to understand instruction you covered all the bases in my book! It's like you are inside my head tell me what to do next. Thanks a million! I can hardly wait until the next video! Thanks, Greg! Have a good one! Dave

[@Halligan142]

Swarf Rat Thanks!

[@machinists-shortcuts]

Hi, you can try keepign the compound set at zero, parallel to the bed and advance the compound half the depth of cut for each pass. By moving the compound and also the cross slide this closely simulates the 30 degree angle. This method also helps with the depth of the thread as the depth is directly on the cross slide dial ( dro ). The tool load is split 87/13 so the trailing edge skims the right hand flank and the leading edge does the majority of the cutting. It's usually best to remove the peaks of the threads before trying the nut, if you get the nut to fit without removing the burrs then it will be loose when you do remove them. Having sharp peaks running on the root radius of the female thread can cause galling and prevents the thread flanks from engaging. When cutting the left hand thread in the video. Instead of plunging in with the cross slide you could still use the compound slide at the same angle as for right hand threads. Feeding in as before for right hand threads but this time the tool will cut on the trailing edge. This will work out just fine and reduce the tool load as before.

[@oppanheimer]

The best thread cutting video I have seen. You're the best man, thanks.

[@tomv.v.5155]

Well explained, thank you. A real time saver in comparison to other "teachers".

[@tessagagnon9690]

best first timing threading video ever man, i learned so much

[@OldObDoc]

best demonstration of lathe work I have ever watched. Practical in the extreme. Thanks for the good work.

[@ClownWhisper]

Thank you for you videos. I have worked my entire life, being productive and industrious. Now I find myself sick, and likely dying. I have Bèen trying to find some sort of hobby that does not take a lot of physical strength. I hafe been a wood worker my whole life but can't do it any more I bought a mini lathe and have been tinkering with it slowly when health permits The mini lathe are very toy like and limited but I have been able to make some small brass canon for fun. And my friend does hobby rockets so I made him a rocket engine tapered form for packing home made rocket engines. I rally Ned to learn threading for some personal items that I need and your videos are helping. You'll never know how important it is for humans to be productive until that is taken away from you! Even if ts just small accomplishments, it's so very important. I used to do lost wax casting precious metals but that is too demanding, Doing this has helped me mentally quite a lot. Basically I need to learn how to thread aluminium threaded caps into bored out bars about one inch diameter I'll keep watching thank you

[@mayarapena1492]

Perfect and very simple, you made it easy to understand, especially for someone who is coming from the CNC world to the manual machining. A lot to learn ... Thank you ...

[@w056007568]

Excellent intro - I like the humour. Great video< I will have to watch it again to catch it all as I found it a great tutorial.

[@ronaldgraziano5170]

Thanks for all your hard work. You simplified the threading process.

[@DaleDirt]

thanks for the info. I am truly a beginner and everything you said helped a lot .

[@KatyLynnWinery]

I am new to machining and just made my first bushing. Your video has been very helpful. Greatly appreciated and Merry Christmas to you and family.

[@billrichardson4873]

great video, cleared up a lot of things, especially why you set compound at an angle.... Thanks so much, also you cleared up the thread dial.....

[@doorguru168888]

Thank You! Getting ready to cut my first thread! You explained it pretty straight forward.

[@keithnoneya]

Thanks for the video. I'm learning to cut threads, I did it once like 15 years ago and It turned out good. This last time I suck, I ended up with lopsided triangle threads. I plunged rather using the top cross slide at 30 degrees. So my next attempt will be your method to see if that will help. Good thing I have extra material I screwed that part up good. Thanks for sharing. Best Wishes & Blessings. Keith Noneya.

[@jeffdeluca1153]

Good tutorial and takes me back to machining days - need to find a good little lathe

[@Iam8ight]

This was excellent! Thanks for including so much detail, not to mention all of your experienced input. Best vid in it's category.

[@calevel]

very unique and creative way to produce tutorial. Thumbs way up!

[@goptools]

Hi Greg, Nice video! Very instructive and well done! Thanks! -mike

[@antman3869]

Great instruction! Many thanks for the video!

[@hjohn61251]

Great tutorial! Very informative. Thanks.

[@OlukayodeOkunowo]

Thank for this work, it is highly educative. I will sure put it into practice.

[@belletebellete8473]

Just easy to follow the entire process. thank you!!

[@k6eep593]

Best threading video I have seen. Nice job!

[@Plagerz89]

awsome video, brings back memories of my old vocational school days. might have to go dig out some of my old tool steel. our company spoils us with tooling and inserts haven't had to grind a bit since school days haha.

[@Halligan142]

yeah. I need to pick up some threading inserts and a holder. A little on the expensive side but we'll worth it.

[@davidreaid5700]

Great, informative video for all of us just getting started. Thanks for all your teachings and hard work putting this together. David

[@Halligan142]

David Reaid Thanks!

[@hamadal-shuaili9909]

Thank you for the clear explanation. Great work.

[@bestbuildpc]

Thanks for sharing this. I love to learn. Amazing job!!! I foud it very interesting!!

[@josepharmstrong8005]

awsome learning video's, love the humour too. much appreciated Thanks.

[@Halligan142]

+Joseph Armstrong Thanks!

[@krazziee2000]

Very good video. Swarf Rat said it all for me. Thanks for the video. Richard

[@jamiebuckley1769]

thanks 4 doing this video as im new to threading on the lathe. got a new 14-40 lathe 2 months ago. thanks for your knowlage.

[@dougankrum3328]

...Nice video....many channels here on cutting threads...but most don't address the actual movement of the compound at 30 degrees....Thanks..

[@ChrisWojnarski]

Very helpful and easy to understand thanks for the great video 👍

[@dean3919]

thats a beautiful southbound ! I have the same one. not as nice but pretty nice ...I like these videos because u use the same lathe and I can really learn a lot better thanks for the great video

[@Towertrip]

dude. this did the trick! thanks! great explanation!

[@Okie-Tom]

Very good video Sir. The one main reason I would rather use single point threading instead of a die is it is very easy to get the die to run the thread a little bit crooked and not straight with the lathe. Been there and done that! Tom

[@dimitrismargaritis7113]

The intro is one of the best!

[@ek6065]

... ways to waste your time

[@madeddiesman-stylemonsterm6662]

Great information. Thank you!

[@martinholloway7694]

This is one of the most helpful videos I’ve ever seen on KZbin. Thanks for taking the time to make it. Much appreciated.

[@stormyeffects4795]

Best intro ever

[@brendanhearne9260]

Thank you for this excellent video.

[@2001himax]

What a great video. Easy to understand. Thanks so much. Norman P.S. Your cat is a good actor !

[@Halligan142]

she gets paid in treats.

[@georgespangler1517]

Well explained,,, l just bought my first lathe,,, 12 x 36 atlas,,,been a home builder all my life but buy and restore classic cars now,,,but now I can't get away from my lathe,,lol

[@stephendaniels363]

Thanks Greg for the threading lesson. And tell that kitty to own up.lol

[@ronsites2694]

Very good instructional video!!

[@jonathanr7436]

Very useful video nice job guy

[@muhaahaloa941]

Nice video thank you keep up the good work

[@crookedriver2079]

at 9:22 I do a lot of model engineering, and what's nice about the Little Machine Shop chart is that it lists a column for 50% thread engagement. There's not tons of force of model engineering fasteners as a rule of thumb, like on an full size automobile. Using 50% thread engagement saves wear on your taps (all my taps are German and Japanese so they ain't cheap). Plus many people don't realize that to go from 70% thread engagement to 95% TRIPLES the force requires to drive the tap, *_but only gives a 5% increase in holding power !!_* . So you break your tap for essentially to no gain!! Something to think about. Incidental notes: generally first four threads carry almost all the load, every thread after progressively does very little as far as load carrying ability - to get full load carrying ability use length of thread equal to one diameter, and you're basically there - just a generalized rule of thumb that covers a myriad of cases.

[@Samy-hh1wn]

I love you. Best video ever about threading

[@matthomer8350]

Great beginners vid..thanks

[@jessestrum]

thanks for posting great job

[@MegaCountach]

Great video! Thanks

[@jster1963]

Great info!

[@user-mk5yx4nw5b]

ขอบคุณครับ ที่แบ่งปันความรู้

[@ChrisBrown-dy8ts]

Good video, I’ve never rotated the compound slide for screw cutting just always keep it on the “0” degree , and whenever I do acme /Trap. Threads, single /multi start I always use a thinner ground tool then side cut until it fits the mating piece,

[@jcknives4162]

Very instructive. thanks. Wish I could see the finished acme thread... just for confidence. Thank you!!

[@Halligan142]

Jeff Conti I have the one from the large dial conversion kzbin.info/www/bejne/eHLchpmGo5eVmc0

[@jcknives4162]

Perfect. thanks!!

[@Brummiejohn200]

Great video, atb John

[@zacnatili9271]

Awesome stuff

[@jensonrozario]

super video man

[@JustMeNoOther]

I have the same grinder! Excellent choice ;) Great video.

[@Halligan142]

JustMeNoOther Hasn't let me down yet and for the price it's a nice little grinder. The new ones are neon Green though. Not a fan of that

[@GNU_Linux_for_good]

That was interesting. Thanks.

[@juanrivero8]

Very nice video. Only criticism is that you didn't cover setting up the gears. This is lathe-dependent, but still essential. Keep 'em coming. Good tip on keeping crosslide horizontal, full turn every time. If yiu really want to go full depth on compound you can use D/cosine(offset angle). = infeed on compound.

[@1990charade]

Very good video

[@BillyTpower]

wicked good, demonstration than you Greg

[@AmarChauhan]

Awesome Video... thank's..

[@STPhilips6453]

damn helpful. thank you

[@johncoscia5258]

Clever cat in the introduction , but I couldn't distinguish who is the brains behind the operation? Lol

[@Halligan142]

Definitely the cat. She can wake me up in the morning to get fed and I’ll do it. My wife can’t even do that.

[@johncoscia5258]

@@Halligan142 AH HA, you love the cat you big softy. She reminded me of my little fluffy friend for 14 years . Yea , he just died 2 weeks gone and l am not ashamed to admit , I really miss him and see his memory too often. So you and the Mrs enjoy the little empress and you really made my day bothering to respond somehow . All the very best mate.

[@erlingweiseth2774]

Great guide! Thanks for sharing! ;)

[@denismorissette419]

Tank's a lot!! I have question that will look strange for you. Do you remember what is the title of the music played while you were grinding. I love it!!

[@paulmanhart4481]

Excellent video (even with the cat). Is he your foreman? Thanks for sharing.

[@RickRose]

Awesome--Thanks! I see you've got the same two trolls visiting with the thumbs down. Daryll and Daryll?

[@Halligan142]

Rick Rose Larry has joined them

[@jma8352]

thanks, i have a nice model c but dont have the attachment hole for the dial. can i drill and tap to get a threading dial for the model c South Bend Lathe?

[@howardtoob]

Great video. That lathe is way too clean but, then again, I am a slob and my shop looks like an OSHA "before" picture. Four thumbs up - I'm using both hands :)

[@Halligan142]

+howardtoob Ha! Thanks!

[@davidrice9995]

+Halligan142 Thank you for this informative video. I was wondering when you are engaging the half nut on the predetermined number or line you aren't stopping the lathe. Is that because it doesn't need to be precise in order to cut the thread (if it is in the correct general area it is fine)? Or are you experienced so you know precisely when to engage the half nut on the line? I don't know if I can do that. It moves pretty quickly. I like your method, it is much faster than mine. I have to stop the lathe, start and stop till it is on the line I want and then engage. If I don't have to do that, it would be awesome and way faster. Also, what speed are you cutting the thread at? Thank you for any help.

[@Halligan142]

It needs to be right on the line. You can easily feel it when you close the nuts. If you are a little off it will ride the screw then the nut will drop in. Go at whatever speed you feel comfortable with. Usually the finer the screw pitch the faster you can go because the carriage is moving slower and you will be taking less of a cut.

[@toddz8579]

Could you please run this video through the YT closed captioning process? It'd be a great help for those of us who can't hear. Thanks!

[@paulleslie2315]

Damn good video, very informative - not overly keen on the cat thing though :)

[@ronbianca9722]

Hi Halligan, Enjoyed your videos very much. Tell me where to find the was it FPI thread pitch gauge 1404-3 15 leaf ? Thanks and stay healthy my friend!

[@Zorgoban]

Great video, thanks! What would happen if you would feed the left-hand thread the same way as the right-hand thread?

[@Halligan142]

Zorgoban you'd end up with a right hand thread

[@justinking6690]

If you needed more room for the left hand thread could you not use a longer stock, and the tailstock to manage runout?

[@NSTRAPPERHUNTER]

I don't have a threading dial for my lathe and I don't think I can even find one. I have an R. McDougall lathe and I can find little info. about it. I can thread by marking the chuck,screw and carriage position Great stuff and thanks for sharing.....Barry

[@jeffdeluca1153]

Excellent excellent video! I was wondering how you do the left hand threads and BAM, there you go! Do you do work for the general youtube community? I have a 1" shaft I need threaded LH on the one end and RH on the other. Building a buffer. Thx

[@Robbieburnett1]

awesome video, so much info. just one question does the speed that the lathe is turning dictate how fast the slider should move to cut the thread? if so how do you find this? thanks anyways Robbie

[@Halligan142]

Robbie Burnett The movement of the carriage is tied to the spindle speed. The faster you turn your spindle the faster your carriage moves, but the rate at which it moves stays constant because your gearbox is labled in feed rate per revolution of the spindle. In other words if you have your feed rate set at .005 per revolution then for every 1 revolution of your spindle your carriage advances .005 no matter the actual RPM speed of the spindle. So if you have your gearbox or gears set to cut a 12TPI thread you will always cut at 12 TPI whether your spindle turns at 1 RPM or 1000 Rpm

[@tashachamp]

thank you great

[@gangleweed]

You "could" cut a taper thread if you mount the pipe piece between centres with the tailstock or an adaptor in the tailstock set over in the conventional way, so don't state it can't be done without a taper turning attachment etc. I have tapped taper threads for pipe fitting with taper taps and you have to go to a specific depth as required.

[@randyfrancisco3009]

Thank you for your great vidio and pls make a internal thread vidio.

[@Halligan142]

Already have kzbin.info/www/bejne/kKWkk5yXbq-qaqc

[@landyman33]

If you put you cutting tool in upside down and thread in reverse you don’t need to worry about stopping at the relief cut at all

[@carryitaround]

Very good. Are you going to do internal??? That's what I'm most interested in. Thanks in advance.

[@ronbianca9722]

Very good Halligan! I found it very informative. It seems like people with those mini-lathes are not able to do threading. Are you a machinist by trade? Take care and stay healthy my friend!

[@1970chevelle396]

Great Video. I cant wait to get my lathe working and start turning threads. I never got to thread anything on a lathe before.

[@xenolard]

Great video thanks. How do you set the cross slide angle in relation to the work? There's a scale on mine but it seems a bit vague?

[@Halligan142]

xenolard There's an angle scale on the compound with a 0 or line marked on the crosslide. Loosen whatever hold down your lathe has for the compound (mine has 2 allens that engage a dovetail) and rotate the compound so that the angle number you want lines up with the 0 or line on the compound.

[@xenolard]

Ahh ok. That's what I thought. Thank you very much. I love your videos. Are you going to do any more "day in the life of an HVAC tech" videos? I really enjoyed them. Cheers

[@georgespangler1517]

Can you cut right hand treads starting from left in reverse and run it out and not have to stop so sudden?

[@DrFiero]

What are your thoughts on tool height? Should the tip of the tool be dead center on the work? Slightly below? I've used the technique of sticking a steel ruler in between, then adjusting until the ruler is vertical. Is there a better way? Thanks for the informative videos!

[@Halligan142]

DrFiero Tip should be on center. Only time I'd go slightly above is when boring to give a clearance. The ruler works. You can also stick a center in your tailstock and use the point of that. You could turn a centerpoint in the lathe and measure from a point on your carriage to the center point and use that measurement to set the height. You could also make a tool like I did in a previous video.

[@NotSoDumb]

Very informational video. One question if I may. You didn't talk about the thread helix when you were grinding your cutting tool. Is this something that only needs to be considered when cutting deeper threads?

[@Halligan142]

+NotSoDumb The side clearance on the grind takes care of that and ensures you won't be running into the thread further down on your tool. I've cut 8 TPI with this same tool

[@NotSoDumb]

Awesome, thanks for the tip. Really appreciate your work. Have leaned a lot from you.

[@anilvarma808]

Awesome

[@lesthompson5907]

time think for you to cover the new choices of mill Threading on a engine lath see Stefan's video, tack on the subject i fawn it most interning as my old English school lath has no led screw. & relies on the rack to cut thread's . no thread cutting dial . needed on a mill threading operation . i found to be to my advantage as with no lead screw i have no diel to time my cut I would like to see your version of the same idea , say cutting a course spindle Nose thread to mount a chuck . ? are you up to the challenge son ? Les England I dont do video or id have a go .

[@hustlerkc11]

So anytime I need to learn anything on my south bend 9" I watch your videos.. they're awesome and you really do make it easy to understand. I do have a question, so with threading did you have to change any gears on the gear train or should I say what gears are being used? And the other is i belie e you made 2 different tools for the regular thread and the acme thread.. correct? Thanks again in advance.

[@Halligan142]

If you have a model c or B that does not have a gearbox follow the chart on the gear train cover. It will show you the configuration of the change gears for a given thread. If you have a gearbox the only thing you will need to change is the stud gear for some of the coarser threads otherwise it's all the handle positions. All that info will be on the gearbox chart. A standard thread tool will have a 60° included angle and the acme tool will be 29° angle with a flat on the tip of varying sizes depending on TPI. You'll need an acme thread gauge for that.

[@hustlerkc11]

@@Halligan142 thanks so much for the reply, I should have mentioned I have a model 9A just wasn't sure if there was a gear that needed to be changed even with the gear box. So ill just follow the chart on the gearbox . Thanks again

[@Halligan142]

@@hustlerkc11 Look on the left side of the chart. There’s a column that says stud. That’s the stud gear used for the given row. The top row uses the 40 tooth heat the rest should use a 20. Stud gear is the gear in the middle of the reversing lever that meshes with the banjo gears.

[@jheurtin1120]

Nice intro

[@yanwo2359]

Did you have the camera tripod sitting on the table when you were showing thread types? There was considerable shaking.

[@Halligan142]

Yan Wo it's strapped to my bench

[@Tbvck]

Thank you sir, I appreciate your video. I have learned a lot, I will be referring back your video to refresh my skills, after I get my little old craftsman lathe repaired, or get a replacement. You have a nice lathe. What brand is it? I like your cat and intro too. Anyway thanks and "Happy New Year!

[@Halligan142]

+Tbvck It is a 1950 Southbend model A

[@Tbvck]

+Halligan142 Thank you

[@lacaver64]

I like cut treads but most like me the tread rolling machine that make the piece most better