platen

J

Jim R. Glines

Joined
Nov 2, 2005
Messages
7
Hi all, can anyone tell me what I can put on my grinders platen to stop the chatter when I use fine belts? when I use 60 or 80 grit it fine, but when I get to the 200 and300 grit belts I get some chater marks. This seem to come from the glue joint of the belt. Thanks in advance for the help.
Jim
 
There is no "magic bullet" for this problem as far as I know.
You can try to use graphite tape but you'll need to replace it often as it deforms quicky.

Try to use Rotary attachment if your financial situation allows.

Alex
 
I have the tempered glass from Ellis on two platens.
The ONLY! way to go.
The graphite stuff is a waste of money. Been there - done that.
 
I like the temperd glass or ceramic ideas for long life of the platen, but there will still be a bump from the joint. Lapp joint are the worst about this. Micron belts show a ripple effect in the steel. Loveless had me go to j-flex in 320,400,600,and 800-p belts. adn the 500 norton. These are low tech, old school belts. but are softer than the micron belts and have nice soft butt splice joints that make this problem much less troublesome. the norton trizac belts have a slightly thicker backing than the 3-m belts which help somewhat as well. mike
 
Norax belts help that problem a great deal. They have a nice thick but very flexible backing. 3M "gator" belts would help with that, too.
 
You need an additional softer platen. For example, I glued 1/4" polyurethane
rubber on one of my platens, followed by a strip of graphite tape.

You'd be amazed at how smooth the grinding will become.

Of course this is not for hogging, but for finess cutting, at higher
grits. In any event you will see that graphite tape (sold by a number
of knife shops) lasts quite a while. I've done may be 20 knifes on mine
and it is still going strong. Dirt cheap and won't take you more than 30
secs to replace it when it wears of.

No chatter, very smooth and even grind, no belt joint jumping either
 
Stop using lap joint belts. As you keep working at it you will come to find that the good belts like the ceramics and structured abrasives are the best and cheapest way to go. I still use AlO belts, like Hermes for the woodworking, but for all the steel work I use the Trizact CF and Norax or Trizact structured abrasives. The A300 CF, or Gator is equivalent to 80 grit and will hog with any other 60 grit belt and last longer.
 
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