Wrinkled blade

C

Cooter DeGraw

Joined
Jan 13, 2005
Messages
44
Finally got my new KMG grinder jump started--was trying to finish grind a blade and was getting (for lack of a better discription) "wrinkles" in the blade running length wise --was using a "limp" 120 belt at the time--in my determination to beat this grimlin have almost ground myself a steel toothpick. HELP Cooter
 
"Wrinkles" or grooves in the blade running length wise, are usually caused by something on the platen, under the belt. And or, using a dull belt running too fast while applying too much pressure.

Make sure your plating in clean, smooth and flat. Use a fresh belt that cuts with little pressure and slow that machine down :)
 
Thanks Don---new machine--platen slick as glass--was using 120 belts at "middle" speed on 3-speed pulley setup--will slow down---use a new belt and attempt not to make another "toothpick"---Thanks Cooter
 
The platen can be slick as glass, but often has 2 bolts holding it on. Those bolts can leave snail trails or worms when using lighter weight belts. Some neoceram or ptroceram glued to the platen stops that. It's high temp ceramic glass.

Gene
 
Hey guys --appreciate the advice--read in one of the verbal/ visual tutorials and the author mentioned gluing a piece of leather to the platen to absorbed the "bumps " from the really flexible belts--going to fab a couple of platens this weekend and try everything--you know, I hate to admit it but most of my problems are lack of practice--have been working so many hours on my day job that i haven't touched that new grinder for a "year". I know it, I deserve a beating. Cooter
 
I had the same exact issue and found I was overusing the finer grits with waaaaaay too much pressure. If you use leather you will get a very slight convex (or more if you press too hard). I have a ceramic platen and a lighter touch solved the issue. My motor is not variable, so I don't have that option. I also found it is much more pronounced in the J-weight belts because they seem to load up faster than the X-weight or stiffer. Hope this helps....
 
on my 1x42 i used to have a soft platen (2 layers bluejeans and i got a nice satin finish with most belts

now with a real grinder and gator belts i dont worry much no belt splice bump on the gator belts that ive ever felt i hog with 50-60 and clean A300-A45 then cork if need be
 
Cooter
I tried the leather and it works FABULOUS! BUt only for about two blades and then it wears out. Bought the ceramic platen from Ellis and it too was great but a little more "bumpy". When I placed new piece of leather under the ceramic platen, that was perfection. But now like Butcher block said... I just use Gators.
Matt
 
Alright thanks for all the help--I gotta try the the leather/glass/gator combo when I can round up all the pieces and parts cooter
 
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