13" South Bend Lathe Quick Change

Old Iron · Jan 4, 2010

I'm thinking about changing the QC on my 1949 13" lathe to the newer style. What I'm wondering is what else would need to be changed and would what would be the benefits if any?

I know it would give me more threading options,I really don't see any other reason other that it mite be easier to use.

Thanks Paul

Gillm · Jan 4, 2010

Hey Paul,
I've never run a single lever before and don't know what the differences are between the single lever and the double lever QC gear boxes as far as fit is concerned.
Ryan (Grey Rider) has a lot of 13" info on his site that might help- http://home.roadrunner.com/~rcbattelle/lathe.html
I'm just getting my 13" dialed in, if you need any specific measurements let me know- http://picasaweb.google.com/GillsAlbum1/13SouthBend#
Gill

Old Iron · Jan 4, 2010

Thanks Gill I have Ryan's site in my favorites also wells site. You have a nice 13" there. I'm taking mine all the way down fot cleanup,Paint and repair.

So I figured if-n I was going to change it that would be the time.

Thanks
Paul

Gillm · Jan 5, 2010

I've got a 13" turret and a little toolin to go with it under my bench if your need'n such a critter :-)
Gill

eng4turns · Jan 5, 2010

Paul;

I don't know what else would have to be changed to swap from a single-tumbler to a double-tumbler gear box but it wouldn't surprise me if you had to change the end gears on the banjo to get the correct shaft speed for the gearbox input.

I've got a 1946 13 with a single-tumbler and a 9 inch with a double-tumbler.

Frankly, I kinda like the single-tumbler better simply because you can get three speeds with the flick of the lever whereas the double-tumbler is slighly more cumbersome to change speeds.

If the double-tumbler possesses any significant advantage, I haven't figured out what it might be that would justify the time and cost of the modification.

Ed in Florida

maynah · Jan 5, 2010

I asked that same question about a 16".
Good answers here. http://www.practicalmachinist.com/vb/showthread.php/16-single-double-tumbler-168968.html?t=168968

wessvic · Oct 7, 2020

13" Single tumbler QCGB

I recently got a 1931 single tumbler 13 inch lathe and started to rebuild the gearbox. I believe Im missing a gear but cant find any info on what gears are suppose to be in the gearbox. My questions are this if anybody has answers I would be very thankful.

How many change gears are there?

How many teeth on each one and the diametral pitch?

What is the bore of each change gear? (From what I measured 13/16 inch is the bore.

I know that is a lot and sounds if I am lazy but I need a base point to figure what route Im going to finish my rebuild.

Here is my lathe info

S/N: 50,601

Model #: 1#186-B

C.F. Gear: STD

R.P. Gear: 6

Lathe Size: 13.25" x 5ft

johnoder · Oct 7, 2020

Maybe useful to you in sorting out

wessvic said:
I recently got a 1931 single tumbler 13 inch lathe and started to rebuild the gearbox. I believe Im missing a gear but cant find any info on what gears are suppose to be in the gearbox. My questions are this if anybody has answers I would be very thankful.

How many change gears are there?

How many teeth on each one and the diametral pitch?

What is the bore of each change gear? (From what I measured 13/16 inch is the bore.

I know that is a lot and sounds if I am lazy but I need a base point to figure what route Im going to finish my rebuild.

Here is my lathe info

S/N: 50,601

Model #: 1#186-B

C.F. Gear: STD

R.P. Gear: 6

Lathe Size: 13.25" x 5ft

kbonk · Oct 15, 2020

I have a 13" DBL lever, haven't threaded with it for ages. I tried some 28tpi today and found out it was cutting 14tpi on the 28tpi setting. I had a work around by using the 56tpi setting, but now I am trying to figure out what's wrong or incorrect. Any thoughts? thanks in advance K

johnoder · Oct 15, 2020

I am trying to figure out what's wrong or incorrect.

See page 7 of 35 here. Though not listed on the QC box, if you have the 48T stud gear installed (instead of the 24), it will definitely cut 14 in the 28 position

http://vintagemachinery.org/pubs/1617/17727.pdf

have fun

SLK001 · Oct 15, 2020

I would also say it is your stud gear that is the problem.

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13" South Bend Lathe Quick Change

Old Iron

Hot Rolled

Gillm

Cast Iron

Old Iron

Hot Rolled

Gillm

Cast Iron

eng4turns

Aluminum

maynah

Stainless

wessvic

Plastic

johnoder

Diamond

kbonk

Plastic

johnoder

Diamond

SLK001

Stainless

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