Oops wrong spindle thread!

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Forum topic by REO posted 11-18-2014 12:53 AM 870 views 0 times favorited 3 replies Add to Favorites Watch
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928 posts in 2043 days

11-18-2014 12:53 AM

I decided to modify my lathe. I wanted to adapt is so that it would be easier to do rosettes and flat work rather than bending over the lathe all the time. I use a duplication system now and wanted the template in the same axis. In order to do this i needed to mount a headstock at 90 degrees to the bed and make a “T” lathe. I found an atlas 6” headstock on ebay for 80.00 and a scroll chuck setup for another 139.00. I thought the spindle would be 1”-8. WRONG! the spindle is 1”-10 kind of an odd thread. I drew up a cross section of both threads and superimposed them on one another. It looks like I still have 80% of the 70% original thread or about 56% thread in contact. So I was thinking of running a 1”-10 tap through the 1”-8 chuck. Better ideas?

3 replies so far

View LeeMills's profile


522 posts in 1270 days

#1 posted 11-18-2014 01:13 AM

What brand chuck do you have? Most of the better ones have inserts instead of direct threaded. I am most familiar with Teknatool (Nova). They have two 8X10 and the Insert C is the R hand. I think you will be better of to return the chuck and swap it for an insert style.
If you scroll down on the link there is a full listing of available inserts.
You can get the Nova G3 for about the same price. If you ever want to move it to a different lathe, maybe one with an 1.25X8 spindle, all you need to do is buy the different insert.
I would think there are at least 4-5 brands that have inserts available in that size.
It may not happen but I think you may be stuck with excessive run out trying to re-thread your chuck.
My second option would be to try and find an adapter to go from the X10 to the X8.

Also I believe the Shopsmith has a 5/8 spindle. If there is enough meat you may be able to drill out and rethread this insert to you 1X10.

-- We cannot solve our problems with the same thinking we used when we created them. Albert Einstein

View Woodknack's profile


11491 posts in 2349 days

#2 posted 11-18-2014 02:19 AM

Oneway sells adapters for pretty much every spindle size there ever was.

-- Rick M,

View REO's profile


928 posts in 2043 days

#3 posted 11-18-2014 03:05 AM

Well, I wanted to stay away from an adapter if I could I thought there was greater oportunity for runout with one of those. this particular chuck came with an insert for a 3/4” thread to 1”-8 and since the thread is already1” it is the correct OD so there is no room for an insert. There is room to bore and thread the inner for 1 1/2-8 like the rest of my lathes I suppose. I had planned on leaving the setup in tact and just moving it back from the bed to use the lathe conventionally. Thanks for the input ! I’ll have to muse over it a bit.

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