1: adversely like on our ID grinder or od grinder, what are the effects of turning the workpiece faster/slower....as the wheel speed doesn't change (although diameter does...so keep that in mind)
The grains in a grinding wheel are teeth or flutes in your milling cutter.
Difference being that if you can get the dull grains to go away sharp ones will take on the job.
It is load per grain that makes a wheel act soft or hard. Sometimes called "unit loading".
Not enough load and they dull down instead of leaving the wheel, now their neighbors get in on the action reducing the load per guy even farther.
Soon everybody is in the cut and there is not enough oomph on anyone to persuade even the very dull guys to leave. Now the part burns.
Keep everything else equal and speed up the wheel the "chip load per tooth" decreases and the the wheel acts harder.
Speed up the table traverse or rotation speed and you increase the chip load making the wheel act softer.
A very slow dress leaves more grains flat to the world and acts hard.
A real fast dress pass leaves a phonograph pattern. Few grains sticking out top doing the work and acts a lot softer, cuts like crazy until the pattern goes away.
Many tricks to make this happen, lots of ways to do it.
This is why grinding is considered by many as an "art". You develop methods that work for you using the wheels, speeds, feeds, coolant that you like to run.
The wheels that I use might not work for others. I'd never recommend a grade unless all the other parameters were in the ballpark with mine.
Bob
