Lathe Back Gear Question

[Greg Hudgins]

Jim, thank you for that information. I was not sure, but now I am.

Ken, that now makes sense. This was already broke when I bought it. I only paid $300 for it with some tooling, a total of 3 chucks, the steady rest and follow rest, face plate and it was/is running. I still think that I made out okay on this purchase.

I will find out more on Monday about getting the gear welded up.

On a side note, as far as new 10" type lathes, what are the better/best options? I would like to not spend more than $2000 on the machine. I was looking at the Grizzle G0602 and the G0752. Any thoughts on either of these?

Again, thank you all for your thoughts and input.

 

[janvanruth]

if boston gears got the right gears, which i doubt, i suggest you buy them
you dont have to bore up the small gear as you can turn down the existing shaft
1 inch will be quite strong enough
you just have to make bushings for the excentrics

 

[chevydyl]

Why not spend that 2000 on a well taken care of used bigger, quality machine
But I think pm or Mathews is another brand, maybe seig as well

 

[BarnyardEngineering]

No, the back gear would no longer work if you grind off the small gear.

When in back gear, the power flow is from the pulley to the left small gear, to the large gear, to the small gear on the right, then to the large gear on the right which is coupled to the spindle.

The back gear would no longer work, but the lathe would still work in direct drive.

 

[Greg Hudgins]

It looks like I am going to try the welding route and see how it comes out. I will post pictures when the work starts.
So, for the time being, I will just leave the back gear out of the machine and continue to clean it up and maybe use it.

chevydyl, I am looking at all my options, but I can not really go bigger due to the foot print of the machine, I am already tight on the current machine.

Thanks again to everyone for your input.

 

[Wobbles]

Some thoughts....

• Actually, it's the larger gear that's most probably pressed onto the shaft.
• If you could find a replacement for the smaller gear, the broken one could be cut off and new one pressed on, but then you'd probably need to weld it in place with a skip weld.
• A straight-cut gear would work as long as the mate was also replaced. But then the remaining helical gear would generate back gear side-thrust, which may or may not be acceptable. (Note that the 2 helical sets point in opposite directions to eliminate thrust in the stock setup.)

All things considered, I'd be looking for a stock replacement !

 

[DAT510]

Hi All,

I'm a bit late to this tread, but I didn't see a final solution. I recently acquired a Jet 1024 Lathe. In my search for a manual, I found my Jet Lathe also produced under a number of other names, one of them being the LAM-350b. In researching the LAM-350b, I found mentioned that the Grizzly 12x37 lathe is also the same, with the exception to the Swing and Bed Length. The good news here is Grizzly still sells parts for it. I purchased some treading gears and other small parts that were missing from my lathe and they all fit.

Though I don't have access to a LAM-350b to verify, I'm hopeful the Grizzly parts would also fit the LAM.

Since I'm new to the forum I can't yet post links. So if you Google "Grizzly G9249 12 x 37 Lathe", you will find the Grizzly page for it.

Though the lathe is no longer sold, the "Purchase Parts" button, below the image of the lathe, will give you parts diagrams, with links to the actual parts, with pricing and availability.

BTW the Back Gear is available for $102.

Hope this helps,

Chris

 

[brino]

Hi Chris,

Welcome to the site!

If you didn't find it, there is a manual for the Jet 1024 Lathe here:
http://www.hobby-machinist.com/resources/jet-1024p-s-1236p-s-pdf.2746/

-brino

 

[DAT510]

Thanks Brino

Chris

 

[markba633csi]

There's also Al Meekins back east (www.gearsmade.com) who can make a gear for you, either just the small gear or the whole shaft- I don't know if it would be worth the price though...
Mark S.