Last time I showed the process for lapping the faces of the chisels. Here is the back of the 1/4” chisel.
In the next phase of chisel sharpening we learned to hone the bevels. In order to more easily hone the chisel by hand we ground a double bevel.
For the purpose of the class we used a Tormek Super Grinder, however the same can be accomplished with a bench grinder and more care to not burn your steel.
Here is a chisel that has been hollow ground…
Hollow ground chisels provide two surfaces for you to rest the chisel upon, which makes it easier to maintain the chisels on the stone.
One interesting aside on the use of mechanical sharpeners: in order to square the tip of the chisel to its edge, you may have to shim the back of the chisel. I don’t have a clear picture of this, but it involves slipping a piece of paper or tape in between the back of the chisel and the honing guide on the long side of the chisel. This helps to roll the chisel and create an even and square edge. It is a finesse thing.
Here is my 1/4” chisel before hollow grinding and covered in paste wax.
After grinding on the wet grinder. Notice the hollow area.
Starting at 1000 grit on t the waterstone, we honed by setting the heel of the bevel and then “clicking” down the tip. Then pushing the chisel backwards. This is the biggest tip I can offer as learned in the class: Think of the move as pushing the chisel instead of pulling it.
We hone just long enough to create the bevel. Due to the hollow grind, you can see flat areas at the tip and heel of the bevel.
Honing on 4000 is to remove the 1000 stones marks. It is critical to flatten the stones often.
Moving up to 8000 grit erases the 4000 marks and moves towards polishing the bevel.
I also removed the wire edge / burr on the back by gently lapping the other side (face) on the 8000. For some chisels you have to chase the wire edge back and forth from the face to the back. But working gently seems to remove it without pushing it back over.
Finally I polished the chisel on a leather strop with honing compound.
Here is the finished chisel. it is razor sharp and easily cuts hair.
Next time: Card Scapers.
-- -John "Do I have to keep typing a smiley? Just assume it's a joke." www.flickr.com/photos/gizmodyne