Thinking of a grinding rig.

S

Sword and Shield

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Apr 3, 2004
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I was pondering my grinder today- a Delta 1x42- and had an idea.

I would like my primary edge angle to be 30*. Could I not take a piece of 2x4, cut a bias of 15* on it, and affix the blank to it?

It sounds like a reliable way to keep the angle constant and ensure a good grind. Am I just nuts?
 
As long as you've got a 90 deg angle between your tooling plate & platen, it should work.

If you've got access to a miter saw you may want to cut a few blocks with different angles and start with a steeper angle and work your way down to 15deg.
 
My belt plate and platen are at 90* exactly with the set screw, so that's a given.

I don't have a miter box, but my table saw can do angles just as easily. Same idea.

What would be a good progression, say 60-45-30-15? start with 75?
 
The only difficulty will be where the blade curves to the tip. These type of jigs work great on straight edges. Maybe some wharcliff style blades. I made a few blocks like the ones you're describing, and had a really difficult time making it work well. I finally spent the time and learned to do it free hand. I don't know that I could hit exactly a 15 degree grind per side, but I mostly just go by feel instead. You could make or use a protractor with a 30 degree angle set in it and just compare the blade to the protractor as you go so you'll know if you're hitting the angles.

--nathan
 
Careful, those 1X42s run FAST for sharpening. You could overheat a blade edge or tip really quickly. We are talking sharpening here, correct?

If you are talking primary bevel grinding, the angle will be more dependant on your pre-HT edge thickness and the height of the blade.
 
We're talking straight grinding. Full flat grind, applied with a 60-grit belt.

Any tips on doing the curve? I'm thinking a sodbuster-esque point would be a good utility blade.
 
Put two round rods on either side of the belt and as you draw you wood across it then let the tang end drop to give you an angle for the tip. Should work for either side for them to stay the same.
 
argel55 said:
Put two round rods on either side of the belt and as you draw you wood across it then let the tang end drop to give you an angle for the tip. Should work for either side for them to stay the same.
Click to expand...

I'm trying to picture this. Do you have the rods parallel to the belt, or perpendicular like rollers?
 
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