cyberslick18
Plastic
- Joined
- Sep 14, 2015
Okay, so we are changing the wheel on this large surface grinder.
We have always had a certain RPM set on the machine and it never changes. I think we can do better by adjusting for wheel wear etc.
So, right on the very face of the machine in large print is "CAUTION: MIN SFPM 8125", and elsewhere maximum 9750.
Easy enough.
The machine is fit for a 16" diameter wheel, the max for the wheel.
The formula for SFPM is (diameter x pi x RPM) / 12, and online calculators from Norton confirm this.
Therefore, for a 16" wheel the spindle RPM should be around 1940 RPM.
The problem? Our spindle speed adjustment goes from 0 to 2400 RPM, and right out of the gate on a brand new wheel its almost topped out. As the wheel decreases in diameter from where we actually can't spin it fast enough to maintain the safe minimum SFPM.
Another problem? Right on the side our of brand new wheel is a message saying do not exceed 2030RPM, which is very close to the RPM needed to maintain the minimum SFPM.
What am I missing here? Are the tolerances really that close? Within a few weeks of heavy grinding we'd have to either run under the min SFPM or exceed the RPM rating of the wheel.
Any help or resources would be great.
We have always had a certain RPM set on the machine and it never changes. I think we can do better by adjusting for wheel wear etc.
So, right on the very face of the machine in large print is "CAUTION: MIN SFPM 8125", and elsewhere maximum 9750.
Easy enough.
The machine is fit for a 16" diameter wheel, the max for the wheel.
The formula for SFPM is (diameter x pi x RPM) / 12, and online calculators from Norton confirm this.
Therefore, for a 16" wheel the spindle RPM should be around 1940 RPM.
The problem? Our spindle speed adjustment goes from 0 to 2400 RPM, and right out of the gate on a brand new wheel its almost topped out. As the wheel decreases in diameter from where we actually can't spin it fast enough to maintain the safe minimum SFPM.
Another problem? Right on the side our of brand new wheel is a message saying do not exceed 2030RPM, which is very close to the RPM needed to maintain the minimum SFPM.
What am I missing here? Are the tolerances really that close? Within a few weeks of heavy grinding we'd have to either run under the min SFPM or exceed the RPM rating of the wheel.
Any help or resources would be great.