Replies

1. 
   TKanzler | Jul 02, 2002 05:10am | #1

   I use arbor attachments on a motor for wire wheel and polishing applications.  Others have posted recently about using a mandrel for the same thing.  But do remember that there are no guards like a real grinder.

   Check out this recent thread.  http://forums.taunton.com/tp-knots/messages?msg=6688.1

    

   Be seeing you...

2. 
   jhweeks | Jul 03, 2002 01:01am | #2

   I'd want to keep the motor itself a bit further away from the grinding, as these motors typically aren't well sealed. Get a couple of pillow blocks with bearings, a shaft to go through them (cold rolled steel is fine) and a pulley for the motor and one for the shaft. If you want the grinder at 1725, use pulleys the same size.

   Mount the pulley between the pillow blocks and the grinding/buffing wheels, etc on the ends outside the blcoks.

   JW

3. 
   DelDollens | Jul 03, 2002 07:32am | #3

   Chris,

   I have recently made a slow speed grinder using a purchased mandrel from Grizzly Imports (http://www.grizzlyimports.com).  Ironically, it is one of the few things they sell that is Made in the USA.  The mandrel consists of a common shaft, threaded on both end to make the arbors, two pillow block bearings, and a sheave/pulley.  I also purchased another pulley of the same diameter for the motor itself, making the grinding wheel RPM 1725 also.  I mounted two 6" X 1-1/2" aluminum-oxide grinding wheels (180 and 320 grit) to the arbors and 'Viola!!' I have a slow speed grinder.  I got the wheels at Grizzly also.  One thing I would do differently would be the shaft size of the mandrel.  The hole size in the wheel was spec'ed at 1/2".  However, when I received them I found out they had inserts in the holes that allowed them to be 1/2" or 5/8", maybe even 3/4".  Grizzly offers two shaft diameters on their mandrels - 1/2 and 5/8.  I would order the 5/8 shaft if I were to do it all over again.  Why?  Because bigger is better, right?  It's not as though I have problems with the 1/2" shaft, either.  Another thing I would do differently would be to remove the pulley from the mandrel and put it on the motor.  then, I would buy a larger diameter pulley for the mandrel.  Ideally, I would want a grinding speed of 1200 RPM, or 188 fpm on the face of the wheel.  I'm sure other have different ideals, but this works for me.  If you have problems finding them on the website, let me know and I will get you the catalog numbers for the mandrel(s) and the wheels.

   -Del