Belt Grinder Performance Testing

I had to test all the belt grinders in my shop to see how well they performed. I only had two choices. A 4" grinder I bought from Harbor Freight and a grinder that I made from a table saw. As a bonus I got Alec Steele and Abom79 to show us how their grinders perform. All you do is grab a 1/2'' bar, measure it, grind as much as you can in one minute, then you measure it to see whats left. If you perform the test on your grinder please post your results. Make sure to post your specs of your grinder as well. Thank you for watching.
US Store:
fireballtool.com/
EU Store:
fireballeu.com/
EU Store:
fireballeu.com/
Surface Speed Calculator:
www.carbidedepot.com/formulas-...