hollow grinding on a bench grinder! / ?

B

bartblade

Joined
Nov 4, 2002
Messages
344
ok i know ill be ridiculed but i did it really!
i was
trying to hog off some steel on my xmas gift for my families present draw. i started and after a few dips in the water to cool off the blade i noticed i was getting the radious of the wheel into the steel so i went with it and kept doing what i was doing and when i was done on that side i ended up with a hollow ground.

switched the wheel to the other side of the grinder and repeted and reproduced the same effect.

looking at the wheel i can see it has a slight angle on the face id say about 5 to 10 degrees. using the highest point is how i did this

so what do you guys think
 
I did my first on a bench grinder too. Found it super difficult to keep the grind even along the blade length because the grindstone gets smaller as you grind. It's definitely possible, but after now grinding on a belt grinder I would never go back to the bench grinder :-) Good work though!!
 
ya but how much is that kmg

and ray to get it even i just wobble the blade as i move it along the length
 
bartblade said:
ya but how much is that kmg

and ray to get it even i just wobble the blade as i move it along the length
Click to expand...

Yeah I came to that conclusion too, but still I wouldn't go back now after using a belt grinder. I have the grizzly model because I couldn't afford more right now. You can get it for just under $500. I sold some random stuff around the house on ebay to get the money :D Even though most consider it bottom of the line for belt grinders it works pretty good for me.
 
I spent 15 years doing my flat grinding on a cheap 1 x 30 and my hollow grinds on a 6" stone wheel bench grinder. It can be done.

I now have the KMG, and I don't expect to use the other two very often. I may actually unbolt them from the work bench and create more work space.

Ickie
 
I've made more knives on 8" benchgrinders than I have on my Coote so far. The coote might be faster and more versatile, but that doesn't mean you have to have one to make knives.

Wheel wear shouldn't be fast enough to bother you over the course of one knife. I usually did batches of 2 or 3 and wouldn't notice any difference until I went to grind the heat treat scale away. Even then it was very minimal and didn't effect the bevel/hollows at all. The trick is to keep the wheels dressed nice and flat, and don't try to grind with the edges of them. I generally lightly dressed the wheels on my grinder every other knife or so to keep them nice and flat, they also cut faster because you've exposed fresh abrasive.


Here's a few knives that I did on benchgrinders:
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They're not perfect by any means, but nobody ever questioned what machine they were ground on....
 
bartblade said:
ya but how much is that kmg

and ray to get it even i just wobble the blade as i move it along the length
Click to expand...

here is the list of prices, but for something that robust it is about the same as a machine shop price. and there are KMGs popping up on ebay of the for sale area of BF.
 
Use what you have at your disposal. If it works for you and your happy with the results
thats all that matters. You certainly do not need any fancy tools to make a knife you just need the will to do it.
 
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