05-27-2017, 08:15 AM
Jan,
The variable speed motor from Penn State Industries I installed with my Viel belt grinder seems to be working. I believe it is a DC motor and it has brushes. What puzzles me are the tachometer readings. The readings range from 2975RPM on full to 1246RPM on minimum. They are consistent, and the same with two tachometers of different design. What puzzles me is that the motor label states it is 1700RPM.
The motor controller supposedly has three potentiometers which can be adjusted. The motor is actually designed for mini lathes used in pen making. It claims to be a half horsepower, although that may be a sleight of hand "developed horsepower rating", the kind favored by marketing departments.
The Viel is direct drive. The fixed speed of the former quarter horse power motor, presumably 1725RPM, was plenty fast. I realize the Surface Feet per Minute varies with the pulley diameter.
I have contacted the support group at Penn State Industries for more detailed information. No response yet.
The belt grinder works very well with the new motor. I sharpened a set of garden loppers. The operation was very controlled and quite satisfactory. I just wish I understood the motor process better.
I appreciate your expertise.
Ken
The variable speed motor from Penn State Industries I installed with my Viel belt grinder seems to be working. I believe it is a DC motor and it has brushes. What puzzles me are the tachometer readings. The readings range from 2975RPM on full to 1246RPM on minimum. They are consistent, and the same with two tachometers of different design. What puzzles me is that the motor label states it is 1700RPM.
The motor controller supposedly has three potentiometers which can be adjusted. The motor is actually designed for mini lathes used in pen making. It claims to be a half horsepower, although that may be a sleight of hand "developed horsepower rating", the kind favored by marketing departments.
The Viel is direct drive. The fixed speed of the former quarter horse power motor, presumably 1725RPM, was plenty fast. I realize the Surface Feet per Minute varies with the pulley diameter.
I have contacted the support group at Penn State Industries for more detailed information. No response yet.
The belt grinder works very well with the new motor. I sharpened a set of garden loppers. The operation was very controlled and quite satisfactory. I just wish I understood the motor process better.
I appreciate your expertise.
Ken