HF Slow Wet 8"
This is a a pretty good Slow/Wet Grinder I picked up at Harbor Freight for $49, the large 10" wheel spins at 200 RPMs and the small 6" at 3400 RPMs..
Te tool rest I made at work on my break and modeled it some what after the LeeValley Veritas tool rest.. It's great for grinding a chipped really bad iron on a plane blade, especially with the amount of poorly sharpened irons I need to do each month, Power is the way to go.
HF Grinder I bought for $49 in pictures below..
They have had sales with price as low as $39 2003
Here you see loaded a Stanley 750 Chisel that I am sharpening a 25 degree primary angle..
Next step is to hone on bench stones the secondary angle form 27-30
View of the profile I milled clamp block.
I hope to be changing this set up soon and remove the 3/8" bar and make it easier for free hand use...
I had time to use this machine much more than when I first wrote it..
The wet wheel is very light on power and will work fine but you must use the high speed wheel to rough the blade first.. I made the tool rest below and I found I was over heating the bearing of the slow wheel by adding to much presure becuse I was not using the high speed wheel.. All in all I would use hand stones after sharpening and came to the conclusion that I had might as well bought a bench grinder...
Bench Grinder is a Must !
After the Primary Edge is roughed on the Iron (Blade) with either a Wet Slow Speed Grinder or The Sharp Sharp Method Below, I think use several different Bench Stones to Hone the Edge to a razors edge. If you don't have a Wet Slow Grinder the next best grinder is a Slow Speed Bench Grinder or a Variable Speed Grinder Like the WC Slow Speed 8" or if you do a lot of grinding a HF 10" even a HF 6" is better then none at all
If you have a standard bench grinder you will have to be extra careful not to let the chisel or iron get to hot and turn blue.. Keep a plastic container of water near by to cool the what ever you are grinning. With the Standard Speed 3400 RPM grinder I would stay away from grinding the very edge of the cutting tool by at the least 1/32" if you try to grind to the very edge 9 out of 10 times the steel with turn blue and you will lose the temper (hardness).. What I would do is if I will hone the secondary angle at 30° I would power grind the primary angle to 25° and then hone on a bench stone the final 30°
I also bought a Jet 10" Slow Wet Grinder when they first where introduced and feel unless your using it for Lathe Tool sharpening you only need a bech grinder with the WC 8" Slow Speed Grinder would be my first choice if I had to do it over again..
Make sure you check out my MK III Sharpening Machine