South Bend Lathe Restoration, Part 17, Threading Dial: Making & Theory

[@mftmachining]

Very good video of a very rarely reviewed subject. Thanks for sharing, Kevin.

[@KevinToppenberg]

Thanks. It a confusing topic at best. Hope I could shed a little bit of light on the subject!

[@normanthompson4729]

At 19:07 I noticed your spindle oilers are empty and shut off , I have the same identical Lathe 15"" model N serail # 58530. I love my Lathe the only thing it does not have, and I wish it did, is a chip catch pan built on it. Watched almost all your videos, pick up some in site on my machine. You show the history of your machine, I went to school in Bridgeport Ct . at Bullard-Havens Tech high school it was named after Bullard Machine tool co in Bridgeport. We had machines donated from Bullard machine tool Co.and Bridgeport machine tool. Keep up the Good work and Thank you for the video content.

[@KevinToppenberg]

You are not the first to notice that my oilers were empty. For the life of me, I can't remember to shut them off when I am done with the lathe. So I fill them up, and then come back and find them empty. And *then* I remember to shut them off. :-( It is so cool that you went to HS in Bridgeport. I bet you have some amazing stories. Best wishes. KT

[@normanthompson4729]

@@KevinToppenberg I forget mine all the time too. Wish there was a better way to do it.

[@craigtate5930]

Looks great....love the dots on the face of the dial

[@KevinToppenberg]

Thanks. I came up with the idea when I didn't think I could stamp numbers on it neatly!

[@jdmccorful]

Ditto on original comment.

[@petemclinc]

I never gave the threading dial much thought until now, great explanation and visual computer modeling. You must be an engineer. This was an interesting project with 3D printed prototypes and final machining of the assembly.

[@KevinToppenberg]

Thank you for the kind words! I actually work in healthcare, but have always loved figuring out how things work. 3D printing is great, but it never has the strength I want. And it turned out to be the "gateway drug" that got me into machining. Ha! Thanks for watching.

[@christinepryor5893]

I believe you did a nice job with your machine and with this series here. If not already, you’ll be thankful you documented and presented all that dedicated work. I look forward to your next series on whatever future project tickles your fancy!

[@KevinToppenberg]

Thanks! It was certainly a long and bumpy journey. Thanks for following along!

[@thumper4121]

I'll be waiting for the next video. I enjoy your series. Sorry if that was my mower. You need a light on the outside of your shop that says, "ON THE AIR". lol😀

[@KevinToppenberg]

LOL, no it wasn't you. I should know better than to video outside during lawn season! Thanks for everything!

[@anissawood4882]

Woot! Thanks for the "epilogue"

[@KevinToppenberg]

And the ant on the forehead was a special something extra! Ha! You did great to muscle through all these videos. It was a long series. Thank you so much for your feedback. :-)

[@anissawood4882]

@@KevinToppenberg I enjoy them! Keep it up!

[@sacriptex5870]

i have an Joinville Lathe, a South Bend 9 Clone from Brazil, mine uses 8tpi lead screw i have downloaded a Longan Lathe dial from Printables, who are 8tpi too! lets see if works!!! Amazing Video! God Bless you and your Family! Greetings from Brazil!

[@KevinToppenberg]

@@sacriptex5870 this sounds amazing! Do you know roughly what year yours was made? Good luck and getting it going!

[@sacriptex5870]

@@KevinToppenberg it was made in 1975, Joinville and Sanches Blanes were the two Brazilian clones of South Bend.

[@KevinToppenberg]

@@sacriptex5870 Excellent! Best wishes on the threading dial. 🙂

[@huibhoogendoorn503]

Nice work Kevin.👍

[@KevinToppenberg]

Thank you! Cheers!

[@mainstreetmachineworks651]

Kevin, loving the series man. I binged it all and love the details! That fix on that cross slide leadscrew was genius. I’m sure it’ll work great! I’m in Bristol, have a SB10L 1939 vintage and a SB13 1976 vintage with all the addons. Nice to see a fellow tradesman in the state, around me in the Eastern part there isn’t many people into machining. Looking forward to more vids Cheers Terence

[@KevinToppenberg]

Wow. It is great that we have similar equipment and interests! We ought to get together sometime. Are there any machining events up in Bristol that you know of?

[@mainstreetmachineworks651]

@@KevinToppenberg for sure! I have my own show up here, do mostly fabrication work, with some small production CNC runs. I love the manual side though. Nothing like using the brain to figure out how to setup a job to get it completed. As far as shows….none that I’m aware of. I’ve been in the trade for 12+ years and have heard of zero gatherings anywhere close in that time. I wish there was more. Seems like Knoxville would have some though…I’m surprised UTK doesn’t host any to get more people engaged in the trade. If your email is is your bio I’ll shoot you an email with my contact info for sure! Terence

[@KevinToppenberg]

@@mainstreetmachineworks651 I'll have to come by sometime if I'm up your way. My email is kdtop3 at gmail dot com.

[@mainstreetmachineworks651]

@@KevinToppenberg I was gonna tell you I have some tools I’m looking to get rid of….I didn’t find your email. If you drop your email we can get in touch. I’d be glad to donate to the channel.

[@KevinToppenberg]

@@mainstreetmachineworks651 kdtop3 at gmail dot com Would love to hear from you. 🙂

[@johntryner7513]

Do you still have way oil in the spindle reservoirs? Saw that in a video from a few months ago. I have read that will ruin the bearings. Should be spindle oil or non detergent motor oil. Great series!!

[@KevinToppenberg]

I got the proper oil for the the spindle bearings, and put them in labeled containers. I got Mobile Velocite #10 for the spindle. I noticed in the video, as I was editing it, that my reservoirs were almost empty. I have a hard time remembering to turn the drip regulator on and off, and sometimes I come back to a puddle on the floor! I got the oiling chart for the lathe, and there are Type A, B & C oil, in addition to the way oil. I thought about making a video about it, but ended up deciding it wasn't unique enough.

[@jeremylastname873]

If using old rod, you can stick it to the surface and let it heat the flux a bit to dry it out. Then break it free and get after the welding.

[@KevinToppenberg]

I will have to remember that for next time. Since doing that welding, I think I saw a welder comment that old rod can cause inclusions. So maybe that contributed to the inclusions I had? Maybe the old flux doesn't aerosolize like it should? Thanks again for the tip.

[@MyLilMule]

The chart for the threading dial chart will be different depending on the ratio of gear teeth to lead screw TPI. For my 13" SBL (6 TPI / 24 tooth gear) the threading chart looks like this: Even numbered threads: Any line on the dial Odd numbered threads: Any NUMBERED line on the dial Threads with 1/2 thread counts (i.e. 11-1/2) Any ODD NUMBERED line on the dial For 1/4 or 1/8 threads Use the same line every time

[@KevinToppenberg]

This seems right and consistent with what mine will be also. Thanks for watching!

[@lesthompson5907]

Ok did you know this point. before we had the led screw that drives the dial som lathe had that shaft on your lath without threads on it but it still cut threads By the ues of the Rack gear . & the timing was set on the wheel shaft . My old Colchester , {Master & greduwat } lath as such a system & that how i cut treds on it it will cut fin there & fast cores threads to fit my spindle. i had thor of making a siston that would allow a rotating sleeve of treds & a standard thread gage . Interesting stuff . my lath as 6 yards to the inch.

[@KevinToppenberg]

I did no know that. I think the history of all this stuff is so cool! Thanks for watching!

[@Expedient_Mensch]

I think it's because of the linear advance of the spur gear along the rotating shaft, if the carriage was stationary, the tooth count would match as you expect.

[@KevinToppenberg]

You must be right. Sure has had me confused! 🙂 Thanks for watching

[@robertpeters9438]

Threads per inch on the linear shaft must match the pitch of the gear's circumfrence. Remember pi.

[@KevinToppenberg]

Mmmmm..... blueberry pie! LOL. Thanks for the comment and for watching.

[@keithbaker8212]

We all leave the key in the chuck i did it today also yes I have key in chuck syndrome lol

[@KevinToppenberg]

I hope you haven't launched one across the shop like I did once. Yikes! Thanks for watching. :-)