Seneca Falls Star 30 vs. Star 10 - Spindle sizes?

[PHPaul]

There's a 3 jaw and a 4 jaw chuck on Fee Bay for a Star 10. Any chance they'd fit the spindle on my 30?

 

[matthewsx]

There's a 3 jaw and a 4 jaw chuck on Fee Bay for a Star 10. Any chance they'd fit the spindle on my 30?

You need to measure your spindle. Diameter in inches / threads per inch.

Most of the chucks for these lathes will be plain back with a backing plate. Even if it’s the right size you still may need to true it up for your machine.

So, unless it’s a smoking deal you’ll probably be better off getting a backing plate and the chuck you want.

John

 

[PHPaul]

Thank you. I'm not sure what would constitute a "smoking deal" but @ $350 asking price, this probably isn't it.

 

[Martin W]

Might find some great info here.

Seneca Falls Star #30 lathe Resto-Mod

One of my buddies, and beginner machinist acquired this Seneca Falls lathe back in Sept. He was like a kid at christmas time with all the excitement of owning his first lathe. Despite the fact that it has to be 100 yrs old and in bad need of some TLC, the machine is truly very sound as far as...

www.hobby-machinist.com

Cheers
Martin

 

[projectnut]

There's a 3 jaw and a 4 jaw chuck on Fee Bay for a Star 10. Any chance they'd fit the spindle on my 30?

The spindle nose thread on a 13" machine (#60, #65, #70, or #75) is 2" in diameter and 8 TPI. The spindle nose on an 11" machine (#25, #30 #40, or #50) is 1 9/16" diameter and 10 TPI. The spindle nose on a 9" machine (#10 or #20) is 1 7/16" in diameter and 12 TPI.

So the answer is NO a chuck "back plate" for a #30 machine will not fit a #10 machine. That being said any chuck within the swing range of the lathe can be used if you make an appropriate size back plate. I have done this on a number of occasions. When adapting chucks with larger diameter screw threads I have either bored out the existing threads, made a plug, pressed and pinned it in place and cut the appropriate new threads.
If the new chuck has a considerably larger thread configuration I've made a plug with external threads to fit the back plate, and bored and threaded it to accommodate the1 7/16-12 threads on the spindle. Once it's threaded into the backplate I pin it in place.

 

[PHPaul]

Well, that's pretty definitive! Thank you!

I guess I'll pass on it, they're used and who knows in what condition. For the price I could find new.