I'm thinking of making a mount to use my Foredom rotary tool with the collet hand piece as a tool post grinder. All commercially made grinders are belt drive. Is there a reason for this?
John
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I'm thinking of making a mount to use my Foredom rotary tool with the collet hand piece as a tool post grinder. All commercially made grinders are belt drive. Is there a reason for this?
John
Cost. A powered spindle suitable for use a a grinder would be $$$$$$$$$$.
Bill
They're belt driven to make it easy to change pulleys and speed, and still get full power.
Two reasons:
1. You can change speeds by changing the belt pulley ratio(s).
2. Vibration isolation. There are two reasons to be using a toolpost grinder: the first is to hit a very specific size, and the second is to obtain a good to very good finish.
Biggest reason is so the motor is not in the way....
Most are single phase so the belt drive helps smooth out the pulses which can be visible in the work.
Bil lD
Also to get the motor drive out of the way and provide space.
My unit is direct drive. No belt...
John, you can use the Foredom if your work is small and needs are infrequent. I have used my Foredom on my Sherline lathe as a grinder and it was fine. But the work was very small. I can't remember where I got the holder for the Foredom but I didn't make it. here's an ebay link for one.