1 1/2" x 8 TPI Chuck threads???????????

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Forum topic by Nubsnstubs posted 11-06-2016 03:09 PM 835 views 0 times favorited 6 replies Add to Favorites Watch
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1414 posts in 1906 days

11-06-2016 03:09 PM

Why are chucks threaded at 1 1/2”x 8 TPI and lathes have a 1 1/4” spindle????? Jerry (in Tucson)

-- Jerry (in Tucson)

6 replies so far

View LeeMills's profile


610 posts in 1477 days

#1 posted 11-06-2016 03:15 PM

I assume it is because they can be used with an insert. Lathes also have 1 1/8, 1, 3/4 and many other sizes.
If not used with an insert then stores would have to carry chucks with each spindle size. Nova alone has about 15 different size inserts so for their three different chucks the store would need to stock 45 just to have a selection of one each.

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

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3036 posts in 2348 days

#2 posted 11-06-2016 03:16 PM

x1 Leeills

-- Bruce, Boise, ID

View Woodknack's profile


12401 posts in 2556 days

#3 posted 11-06-2016 04:50 PM

I assume they were designed as a universal accessory but I don’t know anything about the history of scroll chucks.

-- Rick M,

View Wildwood's profile


2450 posts in 2310 days

#4 posted 11-06-2016 05:13 PM

Only lathe around today that I know with a 1 1/2” x 8 TPI spindle is PM90 and outboard spindle thread 1 1/8”. Since came with an outboard faceplate/hand wheel just assume those are left hand threads.

Catalogs and other web sites used to list lathe names & spindle sizes for faceplates and chuck threaded inserts.

-- Bill

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Leo Van Der Loo

45 posts in 934 days

#5 posted 11-06-2016 05:31 PM

Of course The Oneway is NOT threaded, and has a taper where the insert fits in, much better system, more accurate than thread that has to have clearances for the threads to fit between male and female threads.

And yes a 1 1/4 insert needs more of a difference than a 1/8” for the tread to be tapped into, male and female.

-- Have fun and take care

View Roy Turbett's profile

Roy Turbett

168 posts in 3756 days

#6 posted 11-06-2016 10:11 PM

What brand of chuck are you referring to? VicMarc, Oneway and Hurricane all have inserts that are designed to be matched with your lathe.

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