RE: [CAD_CAM_EDM_DRO] Re: What kind of motor should I use?

I have not seen a 7 inch pulley come apart, but I have been up close and
personal with a fly wheel on a 327 Chevy motor that let go, it was somewhat
akin to being next to a grenade when it explodes. Fortunately the scatter
shield kept the pieces from coming up on the drivers side of the car, but
the mess it made out of the floor, dash, windshield and body work on the
right side was very awakening!

John Guenther

> -----Original Message-----
> From: Dan Mauch [mailto:dmauch@...]
> Sent: Tuesday, February 05, 2002 8:53 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: RE: [CAD_CAM_EDM_DRO] Re: What kind of motor should I use?
>
>
> Good points and one other problem is most people don't consider when
> running spindles at much higher speeds than designed is the significant
> safety factor problem of running a large pulley that was designed to run
> at 1/4 that speed. Have you ever seen a 7"D pulley come apart? I would
> think the centrifugal forces would be enormous. I have not seen one do
> this either but would not want to be in the general area when it did
> come apart.
> Dan
>
> -----Original Message-----
> From: Peter Seddon [mailto:peter@...]
> Sent: Tuesday, February 05, 2002 2:14 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Re: What kind of motor should I use?
>
> The thought of running a motor rated at 3000rev/min at 14,400rev/min is
> terrifying:
> 1. Bearing capability
> 2. Rotor integrity and possible bursting
> 3. Out of balance problems
> 4. Overal efficiency and heating problems
>
> Stick with motors designed for the task and go for longevity of your own
> life !!
>
> Regards Peter
>
>
>
>
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