[modeleng] Re: Vari-speed motors
- From: Allen Messer <al_messer@xxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Sat, 10 Sep 2005 06:26:47 -0700 (PDT)
Hubert, being totlly ignorant of vari-speed motors, I
would consider using a single pully on the lathe
spindle, and vary the speed with a Jackshaft
arrangement either behind or underneath with three or
possible even four speed change pulleys. I'll be
perfectly honest, if I understand you correctly, this
lathe is to be used exclusively for thread cutting?
If so, you won't need a lot of different speeds for
threading, maybe two at the most.
Al
--- shep <shep.28@xxxxxxxxxxxx> wrote:
> Hi all!
> Sorry to rabbit on and on about my construction of
> this little lathe.
>
> Now that various kind and clever friends have given
> me a variety of ideas regarding the boring of the
> headstock of this little lathe, I am able to proceed
> with detailed design. I notice that a variety of
> small lathes and milling machines are now offered
> with vari-speed motors. If I could use one of
> these, it would simplify the headstock design, as I
> could then have just one pulley instead of a cone of
> pulleys. This single pulley could perhaps be
> designed for use with a tooth belt.
>
> I am totally ignorant in the world of these
> vari-speed fractional hp motors (mine would be quite
> small - say 1/10 hp). In the old days, you had to
> use a DC motor, or a three-phase motor to be able to
> vary the speed. But I believe that in the brave
> new world of electronics, an ordinary AC motor can
> be adapted to vari-speed without losing torque at
> the lower speeds.
>
> Any ideas? Thank you in advance!
>
> Cheers! Hubert
>
>
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