Questions on grinding knives

Z

zaco519

Joined
Nov 4, 2011
Messages
84
I just started FFGs but I have some questions
First on my 2x42 craftsman 1/3 Hp sander it heats the metal up extremely fast why is that how cani prevent this
Second what belts should I get and where ( for best deal) silicon carbide belts good and a zirconium alumina belts good

at the tip of my reverse tanto knife the tip is ground more than the rest it's alway convexed

When I do FFGs but chisel ground how much should grind to then put my primary edge on
 
sharp belts grind cooler. Are you grining hardened steel? Finer grits also tend to heat up quicker. For final grinding, I like to go to .007"-.010" before the final edge, but finer than that is fine too.


-X
 
For one, the Craftsman runs fast. Not much you can do about that. For two, I bet you are using some dull belts. That heats up the work quite a bit. Especially use sharp belts for grinding bevels and other flats, when they dull some use them for profiling and rougher jobs. Keep a water bucket and a drying rag by the grinder.

For 2x42 belts, Trugrit.com has the best selection I'm aware of, and the prices are not bad.

Zirconia Alumina is a good choice for rough grinding, lasts OK and the price is usually moderate. Ceramic belts last longer and cost more- totally worth it, IMO. Go for Blaze ceramic belts in lower grits, or Norton 977 or 967F belts. Use other types such as aluminum oxide roughing belts or J-flexes for handle materials, and belts like Trizacts and Trizact CF "Gators" for blade finishing.

Here is a link to my site, the pages on grinding... read up some, there is a lot good on BF about it as well. Use your search function and read the stickies.
https://sites.google.com/site/vorpalcustomknives/shop-techniques-3/grinding-tips
 
I get my 2x42 belts from Trugrit.com and supergrit.com . I have found that I really like the Norton Blaze belts and that new belts really do an all around better job ( who would have thought ). The craftsman does run a little fast but if you practice and work on it a little bit and cool of your blades more, it will do pretty much all the flat grinding you need.

I find that a flat platen plate is a must for my craftsman and helps keep the grinding even compared to just using the plain platen.
 
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