Replies

1. 
   Tinkerer3 | Dec 01, 2009 07:33am | #1

   Would you consider just changing the bearings or making repairs on the old one?

1. 
   JayS | Dec 01, 2009 08:27pm | #3

   I've already replaced the motor, and I think the whole thing is ready to retire. 

   Jay

2. 
   RalphBarker | Dec 01, 2009 08:05pm | #2

   Although I have no science behind my opinion, 3500 RPM also strikes me as too fast for a general-purpose disk sander. But, the high speed might be an advantage for production work on soft woods, I suppose.

1. 
   Tinkerer3 | Dec 04, 2009 12:22am | #6

   I have the Delta 12 inch which runs at 1725.  I like it a lot and wouldn't want it to run any faster.  It is a disk only without a belt.  I think the bigger the disk, the slower it should run to keep the linear speed more nearly constant.

1. 
   TomHigby | Dec 26, 2009 07:57pm | #10

   I agree that high speed is no advantage. I use my lathe for disk sanding, usually at its lowest speed. With the lathe one has a variable speed disk sander. I have built a table that fits on the lathe bed. A good set-up!

   Tom

3. 
   philip | Dec 02, 2009 11:13am | #4

   Sounds potentially tragic that you are not able to resuscitate the old machine-is it a Delta?
   I must add that that 3500rpm is a hell of a speed even for a small diameter disc sander and will result in lots of burnt wood. Without any knowledge of the two Grizzly models I would advise the slower one. Do they have both have the same diameter disc?

   Philip Marcou
1. 
   JayS | Dec 02, 2009 05:33pm | #5

   The old one is a "Toolkraft" that was passed down to me by my father in law as surplus from his machine shop.  Not really sure how old it is.  It worked but was never very precise.  The disc on it is 9 inches.  The new one I was looking at has a 12 inch disc.

   Jay

1. 
   salamfam | Dec 27, 2009 09:33am | #11

   Hi Jay,

   You answered the question about speed. The fact that it came from a machine shop would indicate that it was likely fitted with emery and higher speeds would have been correct for metal grinding, but not woodworking.

4. 
   mike4244 | Dec 04, 2009 02:36am | #7

   I have the slower 1725 rpm disc sander and like it. I used to run a homemade 3450 rpm sander that I thought was okay until I got the Grizzly sander. I retired the old shop made sander. You are correct in assuming the fast speed will burn your stock, also wears the paper out prematurely.

   mike

1. 
   QCInspector | Dec 05, 2009 05:20am | #8

   I bought the slower speed Grizzly and it is living up to my expectations. I haven't used a 3600 rpm type and can't give a comparison.

5. 
   jsr55 | Dec 05, 2009 08:11am | #9

   The slower speed model is best for woodworking.  I have an older Jet 20" disc sander that is 1800 rpm and it is too fast for a 20".  I ended up putting it on a variable frequency drive and typically run it about 750 rpm which is about right.

6. 
   kathy456 | Mar 24, 2018 01:17am | #12

   Grizzly is a great brand. I love 1725 RPM disc sander. The machine is quiet and sanding is smooth. The only downside to this tool is the dust collection. More dust ended up on the top of the spindle table than in the dust port. 

   If you want to know about the best disc sanders go to the website.....

   Best Disc Sanders In 2018

   I think it can help you to find out the best Disc/Belt Sanders.