[TheForge] OT -12v motors

[Grover.Richardson at gtri.gatech.edu]

Yes, dragging the motor down is the real "work issue."  Note that many of the ac motors have a cyntrifical (spelling, I know I can't get it close enough for spell check to even give me a suggestion<G>) speed drop out that clicks out the starter winding when the motor is moving fast enough.  The starter winding is only designed for intermittent use.  If the motor is dragged down sufficiently for the starter to kick in often enough the motor will have a short life.

I use a lot of Harbor Freight stuff.  Chinese motors have a locked rotor rating many times.  So I just push into the wheel until I hear the motor slow down a bit and keep the piece at that level of work.

-----Original Message-----
From: theforge-bounces at mailman.qth.net [mailto:theforge-bounces at mailman.qth.net] On Behalf Of Jerry Frost
Sent: Monday, June 20, 2011 9:17 PM
To: Blacksmithing List Sponsored by ABANA
Subject: Re: [TheForge] OT -12v motors

I don't know how one would work as I don't know how much power is needed for 
the buff, etc. A buff can drag a motor right down if used with a heavy hand 
say needing to get to the bottom of a longitudinal feature like a flute, 
etc. Also, as I recall electric auto fans don't turn very fast but that's 
just an eyeball perception from me when I wasn't interested enough to try 
estimating RPM. They are more torquey compared to a heater blower motor 
though. It's still an idea well worth trying if the opportunity arises.

Jer
----- 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 6:32 AM
Subject: Re: [TheForge] OT -12v motors


> What about a radiator fan motor Jerry?
> Or a small starter with the extra stuff removed ?
>
>
> On Jun 19, 2011, at 5:06 PM, Jerry Frost wrote:
>
>> I don't think so but maybe, if you got one off a bus or similar large rig
>> that needed to move a lot of air over a large space. It might be worth
>> checking around but just following James' suggestion to but from a 
>> surplus
>> outfit would be more certain.
>>
>> Jer

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