[Jewelry making - Article 00032] - Re: [Orchid] Speed Control

[jesse brennan]

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    Single phase AC  110 0r 220 volt induction motors  are not adaptable
    for variable speed  operation period.   3 phase AC motors can use a
    technique  called VFD or variable frequency drive  and can be
    operated  with  a single phase input.   A good example of this is
    sold by Rio Grande  as part of a very versatile lapidary unit. Item
    203-003    page 374  --2004 tool catalog.. The cost here is for a
    whole package  and it is not inexpensive.   A drive system with the
    proper components is not  unreasonable though. 

    Another approach is to use a 90-130 volt DC  motor with a Pulse
    Width Modulation DC control . These are also   fairly inexpensive  (
    particularly with new surplus components) and give excellent speed
    range adjustment  and good low speed torque.   Current brush type
    motors on portable power tools are probably using this technique. I
    have used this on a number of lapidary and shop machines  using
    industrial surplus components. They work very well. 

    It takes more than normal  ( I think)  technical  skills to chose
    the components  and get them working-- but it is not really
    difficult. 

    I usually  buy from: http://surpluscenter.com/ get the catalog and
    find local help if you need it.   You can find a lot of information
    on the web about both techniques. jesse


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