Variable Speed Grinder

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Forum topic by jimnohair posted 04-15-2012 11:51 PM 1260 views 0 times favorited 8 replies Add to Favorites Watch
View jimnohair's profile


2 posts in 2257 days

04-15-2012 11:51 PM

Topic tags/keywords: grinder variable sharpening lathe

Greetings fellow woodworkers,

I will be upgrading soon to a Jet1642 lathe as my current Jet 1236 lathe is no longer sufficient for my needs. I am seriously thinking of taking the motor/gearbox/headstock assembly off of my 1236 and making it into a variable speed grinding system.

My question is this:

The 1236 has a 1”x8 TPI spindle. I need to buy a adaptor to convert this to a 5/8” or 3/4” keyed shaft. Where do I purchase a 1”x8 TPI female to shaft adaptor?

I’ve tried the industrial supply catalogs but could not find anything. Don’t know if this would be a custome made adaptor I should go to a local machine shop to get fabricated.

Thanks in advance for any direction this forum can provide!


8 replies so far

View Fred Hargis's profile

Fred Hargis

4999 posts in 2518 days

#1 posted 04-16-2012 01:14 PM

Having one made might be the easiest…not sure what that would cost. Doesn’t it also have a #2 MT? Maybe you can find something that fits it…

-- Our village hasn't lost it's idiot, he was elected to congress.

View Bill White's profile

Bill White

4948 posts in 3985 days

#2 posted 04-16-2012 02:21 PM

Jim, you have a machine shop contact in your future. My crystal ball never fails. Shouldn’t be too expensive.
Call the folks at Highland Woodworking or Redmond (in ATL). They might give ya a contact.


View RussellAP's profile


3104 posts in 2311 days

#3 posted 04-16-2012 03:29 PM

Google TPI Adaptor.

-- A positive attitude will take you much further than positive thinking ever will.

View TopamaxSurvivor's profile


18288 posts in 3700 days

#4 posted 04-16-2012 05:40 PM

mount it on a bolt and chuck it up.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View moke's profile


1181 posts in 2801 days

#5 posted 04-18-2012 05:01 PM

I believe Beall Buff has an adapter that fits into a MT2…I have used it for buffing wheels, it works good

-- Mike

View jimnohair's profile


2 posts in 2257 days

#6 posted 04-18-2012 11:58 PM


This was exactly what I was looking for.
I will not have to get a custom piece fabricated.


View moke's profile


1181 posts in 2801 days

#7 posted 04-21-2012 05:04 PM

You may want to seat in with a light tap from a dead blow hammer then use….good luck

-- Mike

View Bluepine38's profile


3379 posts in 3110 days

#8 posted 04-21-2012 06:15 PM

I do not know if this method will be steady enough for you, but I use it for my knife sharpening jigs. The
1” 8 TPI is a standard thread, and I have bought 1” 8 TPI coupling nuts and threaded 1” althread into
them using loctite stud and bearing mount to lock the all thread in, then drilled a 1/4” hole through the
diameter of the nut and used a 1/4” tension pin to make the joint permanent. I left about 2” of
allthread setting out the one end of the coupling nut and set the other end of the allthread back
far enough in the nut so the coupling nut would thread onto the drive end of the lathe. I use a
Scotchbrite wheel which has a 1” diameter hole for putting a polished edge on my lathe tools and
carving knives and other cutting instruments. I also made a 8” diameter wood wheel and glued a
leather belt on in to make a strop wheel. There are plenty of grinding wheels/discs available with
1” diameter mounting holes in various grits that you could mount. I have a 10” X 2” wide wet & dry
slow speed grinding wheel that I use for grinding, so I have not used the lathe for grinding. If you
do this, just remember to use a large snug fitting washer on each side of the wheels you use so
you can clamp them securely without damaging the wheels.

-- As ever, Gus-the 79 yr young apprentice carpenter

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