Destroying a grinding wheel with a high speed motor - GIF

**Altair** · Dec 3, 2023, 08:13 PM

Destroying a grinding wheel with a high speed motor.

Previously:

Grinder disc lodged in safety glasses - GIF
Grinder cutting disc shoots into man's stomach - GIF
Exploding disc brake GIF

**Frank S** · Dec 4, 2023, 07:59 AM

Since the grinding wheel was obviously new with the label still in place. A data plate can be seen on top of the motor which most probably has its RPM listed. Only a moron would ignore the RPMs of the two if the one on the motor was higher than the wheel. Or this was purposely staged for either click bait or educational purposes. Which I think may have been the latter, due to the mounted positioning of the camera. In which case due to the unpredictability of when a wheel would fail it may have been drilled or struck a few times on the back side to guarantee it would shatter in a timely manner.

I wonder which was the case.

**TrickieDickie** · Dec 4, 2023, 06:31 PM

Kitchen is a strange place for a destructive video of a grinding stone.

**hemmjo** · Dec 4, 2023, 06:33 PM

I had a friend that was a drag racer. He had a nice looking hot road with a small block chevy in an Anglia body for A/Gas back in the early 1970's. I have no idea what the red line was on the small block chevy, but is was way higher than the cast iron flywheel was rated for. I met him shortly after the incident but did get to see what remained of the car. It was cut almost in half right in front of where the pedals were. He was lucky the driver seat had been mounted further back. He was not in line of all the shrapnel. LOTS of energy stored up in rotating objects.

We actually became good friends as I helped him put together a new race car. He was best man at my wedding 47 years ago. Unfortunately he crashed his Harley a few years ago. But lots of good memories.

**nova_robotics** · Dec 4, 2023, 07:34 PM

Originally Posted by hemmjo

I had a friend that was a drag racer. He had a nice looking hot road with a small block chevy in an Anglia body for A/Gas back in the early 1970's. I have no idea what the red line was on the small block chevy, but is was way higher than the cast iron flywheel was rated for. I met him shortly after the incident but did get to see what remained of the car. It was cut almost in half right in front of where the pedals were. He was lucky the driver seat had been mounted further back. He was not in line of all the shrapnel. LOTS of energy stored up in rotating objects.

When I was in high school there was one of those little Honda Civic wankers that did that with a clutch. I feel like there's a heck of a lot more rotating mass in that flywheel though.

**hemmjo** · Dec 5, 2023, 05:05 AM

Originally Posted by TrickieDickie

Kitchen is a strange place for a destructive video of a grinding stone.

He must not be married. If he was, not anymore.

**Hoosiersmoker** · Dec 5, 2023, 07:55 AM

His wife probably told him to do it in the kitchen because she wanted new appliances, and lights, and glassware, and flooring, and rug... Some of them women is pretty clever, the guy not so much!

**Christophe Mineau** · Dec 8, 2023, 05:15 PM

It's a washing machine universal motor, I 'm not even sure it was intentional, he probably hoped to refurbish the motor.
But these motors need a regulation, on open loop they tend to climb up to infinite speed until destruction (in theory)
I suppose the wheel was well balanced, and friction low enough to put it in that scenario....