Internal Threading

So I've had some viewer request to film some of my internal threading, and I had some come up recently that I thought I would share.

[buddylineman]

Nice work, I like watching your video's, I can tell you take a lot of pride in your work. I am a journeyman lineman and have a small home shop with a 12x36 lathe and a old Tree milling machine and I make things for the guys at work ( tractor parts lawnmower parts or what ever ) and I often watch video's like your to learn how to do things the right way. Thanks for taking the time to post your video's

[klmartin]

I love watching a true professional work. You are an artist with these machines, Adam. Thank you for sharing, and letting us see the quality that these machines can accomplish in the hands of a true artisan.

[danspratt]

I'm going to be getting my first small (7x14) lathe soon, and im watching loads of your videos to learn as much as I can. This is great stuff!

[Abom]

Hi Lenni. On the piston, I wasnt quite the required depth and new that just a spring pass wouldnt be enough, so I fed in another thou on the dial to take a little more. But it turned out just where I need it. When you do enough of this stuff, you start to get a good feel of what works and what doesnt. Also, sometimes spring passes will start to cause chatter problems.

[floridawind]

Wow Adam, another great video. Your threading skills are second to none, thanks for sharing.

[Abom]

Thanks Dan. On even threads you can catch any line on the thread dial. On odd number threads you have to catch every other line, pitches with a 1/2 its only two lines 180 degrees apart, and really odd fractions like 5/8, well you better just catch the same line everytime. Hope that helps, let me know.

[Abom]

Yes I do use the thread chasing dial. When using a 4-jaw chuck, you have to indicate the part true with an indicator. I use a 1' dial indicator mounted on a Noga holder. Indicating is a must learn job for machinists. I show it a few times in some of my other videos.

[PacoOtis]

Dude! You are an excellent instructor! Thanks for the video.

[Abom]

Another good video idea Mark. I've had a fair share of left hand threading in my job shop.

[notfastuc]

Good camera shots I like seeing the big stuff done It really lets you see the detail That threaded test plug you made would make a Nice paper weight for the desk Maybe a future video on who has the biggest threaded test plug

[Buckrun]

This was a great video. I have been going back through OxTool's videos and started going back through yours. I have a little home shop and trying to learn how to do this kind of stuff. I have never turned inside threads and want to learn. This machining is tough to learn on your own. Expecially when you are an old guy with no training since high school and very little then. But I am having a ball! lol

[Abom]

I normally cut with the compound set to the right. Its what I have done for years and has always given me good results. The text books tell you to set it to the left though. I did it that way for a while, then tried it set to the right and it always worked well. Some may say "your doing it wrong" but it works, and provides good end results. I stick to what works for me.
Yes if would have chucked the rod up closer the chatter may have been minimized.

[BJohn]

You made the process look alot easier than it is Adam - Thanks for the videos

[raycurren]

Hi atom,
Great vids. you seem to love your work. I'm trying to learn also. My father in law gave me a south bend lathe and a Bridgeport mill this summer. Everything I know is from u-tube. I find it relaxing. I bought a tig welder also. Wow is that hard! But thank god for guys like you and oxtool and Keith fenner.. Keep them coming.

[MINDSEYE]

Thanks again Adam, and thanks to the higher ups for letting you film at work.
We are the beneficiaries yet again!

Paul

[tylercunningham]

There is a round dial with numbers on the right hand side of the carriage. I forget how many #'s but I think most are like 1-8 or some are 1, A, 2, B, 3, C, 4, D. For an even # thread such as one half 12 you can engage at 2, 4, 6 or 8 odds are the opposite, there is a stationary line on the apron. I hope this makes sense.

[Abom]

I was threading at 300 RPM, the standard for me. When I slowed down I went to 110 rpm. The first pass or two I normally take .020 on the compound, then back off with each remaining pass.

[GusBird]

Enjoyed watching this. I had always thought the purpose of the compound feed was so the leading edge of the 60 degree tool would take the force and make the cut (compound angled to the left for internal, etc.). A few old-timers used say that one final "clean-up" pass (like a .001 or less/same 0 on dial) using just main cross slide will kind of evenly clean/polish the final thread.

[Abom]

Yes chuck, reading a dial clock to zero is easy "for me" to see the zero point then watching the digital readout.
The thread pitch was 12, so I can hit any number on the dial. Even numbers makes that easy.
I've always practiced setting the compound to the right side, but the "technically correct" way of doing an internal is having the compound swung to the left side. Its always worked good for me, and anyone can do it there own way.

[Abom]

I rarely feed the cross slide in past my zero point when cutting 60 degree threads. Some people like doing it because they say it cleans up the entire thread. I do that sometimes when i'm "chasing" a bad thread and want to clean them up because of galling. But normal thread cutting, its not required. But like I said, you do what works best for you.