Thanks to all for Grinder speed info(however)

[Frontier Forge]

Yhanks to all especially Rob.(buy the way great grinder only had it 4 or 5 days) Heres the problem I bought a 3450rpm motor 2hp I rigged it to the grinder with a 2 in pulley on the motor and 4 in on the grinder( is it true im only benifiting from 1/2 the motors hp potential) Now if i were to use step pulleys could I get away with adding a 5,4,3,2 in step just to the motor? Hey rob did Koval tell you that my grinder shipment was damaged(the box) A bunch of kmg parts fell out of the box, Koval is sending replacments but it will probably take forever.....Next and final qust to any one....Im wainting for a hollow grinding jig(the one from Koval) If anyone has experience or helpfull info that would be great. Thanks in advance..Bob M of Frontier Forge Works

 

[rfrink]

Bob,
There is nothing wrong with that motor....it sounds great! With that motor it is very easy to get the high speed range but a little tougher to get the grinder slowed down for finishing...not impossible or over challenging though. The 5,4,3,2 on the motor would be good....however I doubt that you'll ever need the 5" position. Also in the 2" postion, the grinder will still be fast if you keep the 4" pulley on the grinder...for finishing. Ideal finishing speed would be to run the grinder drive shaft at about 800 or so. That would require something like an 8" pulley on the grinder and the 2" position on your motor. But heck, just use it like it is and change it only if/when you need too.

Yep, I was at Koval's this morning and got the order for your replacements. I learned that the parcel carriers (UPS) tend to tumble these heavy packages rather than picking them up. I'm mean end over end ...c-bang! c-bang! :grumpy:

I played around with one of those hollow grinding fixtures a few years ago:

I borrowed it from Koval to mount on a KMG1. Played with it for a few hours. Not sure if I liked it or not....but I'm not a maker and never ground a blade with it. Very well made!

Take care,
Rob

 

[fitzo]

i bought one of those jigs trying to cut the learning curve for my student. very tough to set up right. have to change alot for every thickness of steel. worst of all, the dang thing was dangerous...more than once the blade, ground edge-down, jammed in between the jig and blade. grinder comes to halt and blade ruined. well made, yes, but definitely not a turnkey approach to grinding. while this may work well for someonne else, i have an expensive lesson sitting useless under my bench. no substitute for learning to grind freehand!

 

[Mike Hull]

Like Mike Fitzgerald said,"no substitute for learning to grind freehand"! He is absolutely right, and the longer you use a crutch, the longer it will take you to learn proper grinding techniques.
I think you would be better off spending the $$ on more belts and steel to practice on.