Homemade grinder vid

I was questioning the integrity of the wheels. I mean when you have then spinning at how many thousands of rpms will they stand up???? Hmmmmm solid aluminum/steel vs plywood????

I am in the process of making my own grinder but I think for my safety and peace of mind I will be avoiding the wooden wheels.

BTW the second vid of the stainless grinder in that thread is pretty awesome.
 
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