[TheForge] OT -12v motors

[CraigSchaefer]

always wear a buffing and grinding helmet. 





CraigS 
Gresham, OR 
----- Original Message ----- 
From: "peter fels" <artgawk at thegrid.net> 
To: "Blacksmithing List Sponsored by ABANA" <theforge at mailman.qth.net> 
Sent: Monday, June 20, 2011 12:12:52 PM 
Subject: Re: [TheForge] OT -12v motors 

I see a lot of folks using an unshielded buffing wheel or wire brush, and it's threatening...especially in larger wheels! 
A minimum, easily added safety measure, 
is a stout, adjustable, back bar, that blocks ( hopefully) loose objects snagged in the wheel , 
from coming full circle and embedding in your face. 
It's not really adequate, but it's quick and better than nothing. 

On Jun 20, 2011, at 11:55 AM, Andrew Vida wrote: 

> On 6/20/2011 8:22 AM, Grover.Richardson at gtri.gatech.edu wrote: 
>> The question is how much HP does a normal 110 V motor have, the one 
> used on the buffing wheel that you wish to replicate.  Find a dc motor 
> of equivalent horsepower and you will have a pretty much equivalent 
> grinder.  The dc motor will have different characteristics under load 
> (shunt or series fed (bunches of gobbledegook that is not that important 
> to someone who just wants to use it<G>), but overall should provide you 
> with a pleasurable tool. 
>> 
> 
> My small buffer, 1800 rpm, is 1/2 hp.  It will hurt you if you do not 
> show the proper care, but my 3600 rpm 3/4 hp is monster enough to kill 
> you fast and ugly.  You don't need more power for anything of moderate 
> size.    Those large spindle, high hp industrial buffers such as the 
> ones GE made ages ago have their places, but  only for substantially 
> larger work.  I'd call 1/2 hp good for most tasks.  A lower spindle 
> speed is definitely desirable from both the safety standpoint as well as 
> that of not cutting your surfaces.  3600 rpm motors will allow you to 
> cut very deeply into your work far faster than many people would 
> initially think possible.  The difference between 1800 and 3600 is 
> remarkable. 
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