[modeleng] Re: Vari-speed motors
- From: Marian Lynch <sb286643@xxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Wed, 14 Sep 2005 17:17:04 +0200
Hi,
The solution is simple:
Every AC motor (even triphase)can be made to vary its RPM, with some
electronics.
If you take a motor (AC) that has carbon brushes (like a power dril, a
hoover etc)
you can make a simple electronic PC board, that varies the RPM.
If you are an electronic novice, "Veleman kit sel a kit, wich is simple
to make an can take
motors up to 1500 watts, I think it cost no more than 25 GBP
Patrick
Flanders
Allen Messer wrote:
>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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>>
>>
>
>
>
>
>
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