problems grinding on my grizzly g1015

G

Geerup61

Joined
Mar 23, 2014
Messages
8
I am very new to the knife making world. I bought a Grizzly g1015 sander buffer. I profiled a few knives with 36 and 60 grit belts and havent had any problems. Until I Switch to a higher grit belt 100,120,220,320. the knife will hop or chatter on the contact wheel.
The same thing happens when I try to hollow grind. No problems with the 36 or 60 grit belts, just the finer grit belts.
What am I missing here?
1. Is it the seam in the belt? they are all brand new.
2. Is it my 8" contact wheel? It doesnt seem to have any bumps on it. Do i need a serrated wheel? maybe a soft wheel.
Like i said i am new to this and enjoy the craft so far. any help, suggestions, pointers, would be greatly appreciated.
I also know i went with the cheap grinder. this is what i can afford for right now.
 
I'm guessing that your coarse belts are an x weight (stiff) belt and the finer grit belts are J-flex. This can lend itself to some hop if the belt tension isn't high enough. One problem with the Grizzly grinder is that the belt tension spring isn't strong enough by itself to give you the proper belt tension. Adjust the tension so that the spring is fully compressed. This should cure your problems.

Gary
 
^^^^ That. Plus, make sure your belts are fresh and sharp. Because the belt tension is a problem with the Grizzly I would suggest developing a lighter touch. You can hog a lot of material off with the coarse belts but when you start moving higher in the grits lighten up the pressure and let the belt do the work. It may take more passes but you will get better results. What can sometimes happen, especially on a machine with inadequate belt tension, is that when you press hard against the belt the belt can ripple up or bunch up at the leading edge causing poor grinds and hopping or chatter. By using lighter pressure the belt will pass the blade flatter giving you less chatter and flatter grinds. This will be more apparent with the thinner and more flexible belts. And keep an eye on platen wear. If the platen starts getting grooves in it re-surface it flat.
 
I compressed the spring as much as i could and have the same results.I not putting a lot of pressurre on it either.
either way i really appreciate your yime
 
I think that you'll find that you will have more control if you set up the grinder in a vertical configuration.

Gary
 
thats not how i normally do it, it was down cause i was working on it.i didnt have any control cause i was filming with my other hand. i was wondering if anyone could see or hear the hop.
 
I was wondering what brand belts you are using. When I use "no name" belts on my Grizz, I get a bad splice bump. As I change from different grits & brands, I have to keep "tuning" my Grizz. I just have learned to live with the adjustments, until I can upgrade to a real grinder.
 
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