|Project by dgom||posted 02-09-2014 08:17 PM||9341 views||34 times favorited||10 comments|
Since I have had the dia. 250 mm (10”) stone laying around unused for about twentyfive years now and there was a need to be able to sharpen the blades of all my old wooden hand planes, chisels, etc., I realised that it was time to make some use of the stone. I got inspired when I saw Bob Rozaieski's wooden wet grinder and decided to do something similar from birch plywood.
The arbor is just a piece of 1/2” steel tube, glued with epoxy squarely through the wheel’s arbor hole. The arbor spins in a pair of home made flanged sleeve bearings (made from copper tube) greased with copper paste. Initially the grinder was set up to be hand cranked, but after sharpening a half dozen plane blades I realized that I needed to upgrade the rig with a motor.
That was then I started to study how Tormek solved the motor drive of their products and stumbled upon their rolling friction drive which was so ingeniously simple and easy to implement. Hence I turned the honing wheel/friction disc on the lathe from MDF. I covered the friction drive surface with a strip of bicycle inner tube and the larger honing surface with a piece of leather from an old belt. I then had to add another piece of birch plywood (fastened to the original base with flat irons screwed from below) to prolong the base to be able to support the motor housing and the prolonged arbor. The motor was reclaimed from an at least 40 years old electrical typewriter. I just had to find a suitable bushing to fit on the motor axle to get the desired rotation speed of the stone of about 180 r.p.m..
Using the wet grinder together with the original tool rest revealed limitations of the system and I realized I needed something better. I found that Tormeks universal tool rest seemed simple and versatile and decided to fabricate a similar solution and at the same time also made a gouge jig and a square edge jig. The nice thing is that I can use any of Tormeks original jigs since the dimensions of the tool rest are identical with the original.
The set of profiled honing wheels is a later addition turned from MDF.
I’m satisfied with the grinder and think it suits my needs well. However after some extensive use I have noticed that the stone needs to be trued so I will have to make a jig to be able to fix that.
I also made another universal tool rest holder for the bench grinder to be able to rough sharpen if necessary before bringing the tools to the wet grinder.