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ATM [Fwd: BOUNCE atm@shore.net: Non-member submission from ["Archer Sully" <archer@theo.meer.net>]]

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>From atm-owner  Sun Jul  6 18:48:35 1997
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From: "Archer Sully" <archer@theo.meer.net>
Message-Id: <9707061550.ZM736@theo.meer.net>
Date: Sun, 6 Jul 1997 15:50:32 -0700
In-Reply-To: owner-atm@shore.net (atm-digest)
        "atm-digest V1 #784" (Jul  6, 12:42am)
References: <199707060442.AAA08488@aquarium.shore.net>
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To: atm@shore.net
Subject: ATM Questions on computerized alt-az
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I'm getting ready to computerize my alt-az scope per Mel's excellent
system, and I have a couple questions:

1.  It is intimated that half-stepping results in excess vibration (which
    I can easily believe), but I was wondering if this is due to the nature
    of half-stepping or the size and frequency of the steps when moving
    the telescope.  Could a stepper with a sufficient number of steps
    be used in half-step mode without causing problems?

2.  Some of the devices that I would like to use to control the scope
    do not have parallel ports.  Are there any cheap microstepping
    controllers with the option of serial control?  Has anyone
    successfully implemented such a control?  There was a mention of
    such a device on the stepper motor forum at eio.com, but no
    part numbers or specific web pages.

3.  (Not a stepper question per se):  Mechanically, I'm basically an
    ignoramous, and I don't fully understand the drive mechanism in
    azimuth in Mel's scope.  Does the conical portion of the drive
    shaft simply press against the edge of the azimuth disk, and drive
    it purely with friction?

Thanks for any information, etc...

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