9100
Diamond
- Joined
- Nov 1, 2004
- Location
- Webster Groves, MO
What I have-
A Cincinnati cylindrical grinder that uses 16" wheels, up to 2" thick. They are driven by a 5 hp motor through flat belts with no provision for changing speed. It has two contactors for forward and reverse controlled by a simple switch, forward, off, reverse. No start and stop buttons. The problem is that the wheels cost several hundred dollars and the customer naturally wants to get maximum life. As they wear down, the surface speed and stock removal rate drop, making the job take longer.
We have a Mitsubishi 10 hp drive, overkill, but we already have it. It has an internal braking resistor and an analog output for frequency. The setup would have the on-off switch, a speed control pot, and a red LED digital panel meter showing speed. We have one of the Mitsubishi remote controls with an LCD display on another grinder and the operator doesn't like it, too hard to read. The owner feels strongly that the control and display should be easily read and the speed set so the operator doesn't need to bend over or step away from the main controls. I agree.
With the amount of inertia in a 16" wheel, braking is highly desirable. On another smaller grinder that many people use, they have had trouble with them pushing the stop button and waking away, leaving the drives lit up indefinitley. On it, I put a timer on the contactor so that it keeps the power on during the braking cycle and then shuts down with no further action on the part of the operator. I'm not sure that would be the best idea here. The grinder has a limited number of operators and a noisy fan on the electrical compartment that reminds them to turn off the disconnect.
I'm open to suggestions.
Bill
A Cincinnati cylindrical grinder that uses 16" wheels, up to 2" thick. They are driven by a 5 hp motor through flat belts with no provision for changing speed. It has two contactors for forward and reverse controlled by a simple switch, forward, off, reverse. No start and stop buttons. The problem is that the wheels cost several hundred dollars and the customer naturally wants to get maximum life. As they wear down, the surface speed and stock removal rate drop, making the job take longer.
We have a Mitsubishi 10 hp drive, overkill, but we already have it. It has an internal braking resistor and an analog output for frequency. The setup would have the on-off switch, a speed control pot, and a red LED digital panel meter showing speed. We have one of the Mitsubishi remote controls with an LCD display on another grinder and the operator doesn't like it, too hard to read. The owner feels strongly that the control and display should be easily read and the speed set so the operator doesn't need to bend over or step away from the main controls. I agree.
With the amount of inertia in a 16" wheel, braking is highly desirable. On another smaller grinder that many people use, they have had trouble with them pushing the stop button and waking away, leaving the drives lit up indefinitley. On it, I put a timer on the contactor so that it keeps the power on during the braking cycle and then shuts down with no further action on the part of the operator. I'm not sure that would be the best idea here. The grinder has a limited number of operators and a noisy fan on the electrical compartment that reminds them to turn off the disconnect.
I'm open to suggestions.
Bill