[Jewelry making - Article 00158] - Re: [Orchid] Building servo driver

[Ian W. Wright]

========[ Invite a Friend - http://www.ganoksin.com/invite.htm  ]========

    Thanks for the replies. Terry, The only reason that I was thinking of
    a 24volt supply is that the motor I have which I was intending to
    start with is rated at 24volts. I already have a small 4-axis cnc
    milling machine which I built from scratch but which is driven by
    stepper motors. For most things is is OK if a bit slow but I now
    want to be able to use it to cut threads and do rigid tapping and the
    existing rotary axis is just too slow to get a good finish. So I am
    intending to mount a watchmakers lathe on the machine table and
    drive the lathe spindle with a servo motor to get smoother and faster
    rotation. Ultimately I'll probably replace all the motors with
    servos but I have a severe limitation on funds for the project -
    hence the surplus motor and 'build-it-yourself' electronics. Looking
    at the spec for the 7805 it seems to indicate that it is good for up
    to a 35volt input - with decent heat sinking. Now I realise that I
    hadn't looked carefully enough at the schematic and the 7805 is
    working 'the wrong way round' - i.e. not as I had assumed left in,
    right out, it all makes sense. I think I'll have to take my brain out
    and polish it!!! The zener you mention is a 27volt one and all the
    FETs (1N530 and 1N9531) are 60-100volt (none of the ones specified in
    the schematic were available over here so I have had to look for
    equivalents), perhaps I could change the zener for a 35 volt one
    without upsetting things too much as it is only for transient
    suppression. However, I will try 15 volts as the supply to start with
    and see if the servo has enough power for my needs. 

Best wishes,
Ian
Ian W. Wright
Sheffield UK
____________________________________________________________________
T h e   O r c h i d   L i s t
Open Electronic Forum for Jewelry Manufacturing Methods and Procedures
____________________________________________________________________
Orchid FAQ:
~ http://www.ganoksin.com/orchid/faq.htm
Orchid Archives:
~ http://www.ganoksin.com/orchid/archive
Orchid Galleries:
~ http://www.ganoksin.com/orchid/gallery.htm
Invite a Friend:
~ http://www.ganoksin.com/invite.htm
____________________________________________________________________
Tips From The Jeweler's Bench - Article Archive
~ http://www.ganoksin.com/borisat/tip_sear.htm
The Jeweler's Selected Bibliography List
~ http://www.ganoksin.com/jewelry-books
Buy Orchid Jewelry:
~ http://www.ganoksin.com/shop
____________________________________________________________________
-Unsubscribe:
-Email: orchid-request AT ganoksin.com Body=unsubscribe subject=blank
____________________________________________________________________