Lathe Chucks

[rcplaneguy]

I bought the G3 shopsmith bundle from amazon. Works great, very pleased. Good price too!

[thunderbirdbat]

I have inherited a SS Mark V and am researching chucks for small bowl & plate turning. The Nova G3 Chuck 30th Anniversary bundle looks like a good deal, but is this particular chuck adaptable to the SS? I’m a little confused about insert and reversible chucks. Is this bundle only for Nova lathes?

From looking at the description for the Anniversary bundle it is not compatible with the SS. The one in the bundle is threaded, the SS needs a 5/8" plain bore to fit on the quill.

[JPG]

The 'shopsmith adapter' converts from 1 x 8 TPI to 5/8 smooth bore.

[thunderbirdbat]

The 'shopsmith adapter' converts from 1 x 8 TPI to 5/8 smooth bore.

JPG, what adapter are you talking about? The Nova adapter I have for my G3 chuck is 1 5/16", I am not sure about the TPI but it may be 8. I know the description for the Anniversary bundle that I found online at Rockler states: " Though designed for the Nova Comet II Midi Lathe (#46457, sold separately), it can be used on any lathe with a 1'' x 8 TPI thread. This is not an insert style chuck. Cannot use an insert/adapter to change the threading."

[JPG]

The 'shopsmith adapter' converts from 1 x 8 TPI to 5/8 smooth bore.

JPG, what adapter are you talking about? The Nova adapter I have for my G3 chuck is 1 5/16", I am not sure about the TPI but it may be 8. I know the description for the Anniversary bundle that I found online at Rockler states: " Though designed for the Nova Comet II Midi Lathe (#46457, sold separately), it can be used on any lathe with a 1'' x 8 TPI thread. This is not an insert style chuck. Cannot use an insert/adapter to change the threading."

IIUC ISNS

NOVA SS ADAPTER.jpg (79.67 KiB) Viewed 21470 times

A 1" x 8 TPI thread is on the outside that mates to the chuck internal thread.

That seems to contradict the later 'cannot' sentence.

[thunderbirdbat]

The ISNS adapter would be too large to fit the chuck in the anniversary bundle. I measured my ISNS insert threaded end at 1 5/16" with maybe 8 TPI as I did not measure the threads, hence why they state it cannot be used with this chuck. There may be some other company that makes an insert 5/8" plain bore to 1" 8 TPI but I do not know.

[rpd]

As Brenda said, there are three different versions of the G3 chuck, one direct threaded 1"x8TPI, one direct threaded M33, and one that takes inserts.
https://www.teknatool.com/product-category/chucks/

[dusty]

https://www.shopsmith.com/ss_forum/view ... va#p249282

[thunderbirdbat]

As Brenda said, there are three different versions of the G3 chuck, one direct threaded 1"x8TPI, one direct threaded M33, and one that takes inserts.
https://www.teknatool.com/product-category/chucks/

Interesting as 1 5/16 converts to about 33 mm, that may be the insert size and I was slightly off on my measurement as my ruler was in 32nds. 1 5/16" = 33.3375 mm 1 19/64" = 33.29921 mm 1 9/32" = 32.5438 mm The brochure/manual for the G3 also lists a 3/4" 16 TPI direct thread option for the G3 chuck.

[geocaljr]

Thanks for everyone's input. I'm surmising that the 30th Anniversary bundle is NOT appropriate for the SS and that I would require an insert type G3 with the 5/8" ISNS adaptor.