Lathe Chucks

[JPG]

OK! I assume the 'insert/adapter version has a threaded body that is NOT 1 x 8? If not, what is the insert outer thread size?

[thunderbirdbat]

OK! I assume the 'insert/adapter version has a threaded body that is NOT 1 x 8? If not, what is the insert outer thread size?

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.

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.

[dusty]

https://www.rockler.com/nova-chuck-inse ... gJZKPD_BwE

[Mike907]

Shopsmith sells the Nova G3 chuck with the adapter and a set of pin, or tower jaws.

Shopsmith used to sell the Oneway Talon chuck with the appropriate adapter. I think that most users who have tried both, prefer the Talon chuck, which is available elsewhere.

https://www.shopsmith.com/ownersite/catalog/nova_g3.htm

Mike

[JPG]

PSI makes a 5/8" plain bore to 1 x 8 tpi adapter. That is what I have been thinking about all this time.

Any reason it will not work?

[ChrisNeilan]

PSI makes a 5/8" plain bore to 1 x 8 tpi adapter. That is what I have been thinking about all this time.

Any reason it will not work?

I have that adaptor and itis well made and balanced. The problem I have is that if I use it to hold a chuck onto the shopsmith, when I turn off the machine the chuck wants to unscrew and spin off. There is no grub screw. If you switch to the correct insert(yes an additional step), it will stay put. I now have a dedicated chuck for the Shopsmith as well as others for my delta and powermatic.

[beeg]

PSI makes a 5/8" plain bore to 1 x 8 tpi adapter. That is what I have been thinking about all this time.

Any reason it will not work?

The problem I have is that if I use it to hold a chuck onto the shopsmith, when I turn off the machine the chuck wants to unscrew and spin off. There is no grub screw. If you switch to the correct insert(yes an additional step), it will stay put. I now have a dedicated chuck for the Shopsmith as well as others for my delta and powermatic.

There are adapters out there that are 5/8 bore, BUT they don't have the 3° screw hole. That's why Chris's will try to unscrew. I forget the adapters number, but it's something like ISNF

[ChrisNeilan]

PSI makes a 5/8" plain bore to 1 x 8 tpi adapter. That is what I have been thinking about all this time.

Any reason it will not work?

The problem I have is that if I use it to hold a chuck onto the shopsmith, when I turn off the machine the chuck wants to unscrew and spin off. There is no grub screw. If you switch to the correct insert(yes an additional step), it will stay put. I now have a dedicated chuck for the Shopsmith as well as others for my delta and powermatic.

There are adapters out there that are 5/8 bore, BUT they don't have the 3° screw hole. That's why Chris's will try to unscrew. I forget the adapters number, but it's something like ISNF

No, that is not what I wrote. The adapter stays on the spindle. It does have a set screw. The chuck spins off the adapter. With a bowl blank on, there is much inertia. The headstock stops fairly quickly and the chuck comes loose. I think Beeg is thinking of the chuck insert...
Now, I do have the correct insert for the Oneway Talon Chuck. That chuck never spins off the spindle.

[JPG]

Notice it HAS a grub screw!!!

NOVA G3 ANNIVERSARY SPECIAL WITH PSI ADAPTER(1X8 TO .625 PLAIN).jpg (183.77 KiB) Viewed 22746 times

Yes it all arrived Wed.

[dusty]

Why is the fact that it has a grub screw being mentioned (highlighted)?