moving the flats up

J

jasperdog032469

Joined
Mar 14, 2007
Messages
115
I've been trying to grind my own blades for a while now, and just sent my first miserable batch out for heat treat.:barf: When I look at alot of the blades on here I dont see a flat above your grind lines. How do you do that? Are you taking the grind all the way to the top? I tried that, but got indetiontions from the grind when you look down on the top of the spine.

Hope to post my first one on here soon so that you can pick it apart.

One more thing while I'm on here. I know everyone has there own way of doing things, but when you grind your blades do you take the hollow all the way down to 400, or do you preferr to let it go to HT with a 150 belt and then go the rest of the way down after HT.

Thanks,

Dave
 
As for the grind, you can take a full flat grind all the way up to the spine slowly and carefully. I tend to get the indentions at the spine as well, but if you stop short of the spine and move to progressively higher belts, you can gently ease the line all the way up to the spine with a high grit belt. Probably do this after heat treat so that if you have decarb to remove or discoloration to deal with, you'll be able to carefully finish the grind up to the spine as you work. Carefull not to over heat with plenty dips in a bucket of water.

--nathan
 
What silver_pilate said above is pretty much it. Just be careful. Now, if you DO "notch" the top of your spine, you can fix it by carefully holding the blade vertically on your platen (use a magnet to hold onto) and CAREFULLY grinding the ricasso/spine back down.

-d
 
deker said:
What silver_pilate said above is pretty much it. Just be careful. Now, if you DO "notch" the top of your spine, you can fix it by carefully holding the blade vertically on your platen (use a magnet to hold onto) and CAREFULLY grinding the ricasso/spine back down.

-d
Click to expand...

Just make sure you don't eat a divot inot the blade with the small wheels. You can also do it to an annealed balde with coarse grind sandpaper wrapped around something hard and flat like a bar of steel or brass.
 
Screw ups at the spine? That's what false edges are for...
 
Nice thin blade for slicing ability with a super heavy duty extra thick ricasso for strength. It's the best of both worlds.:D

If you only go a little bit too far you can take the ricasso down to match with some 220 grit sandpaper on a flat surface. Much less likely to screw it up than with the grinder.
 
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