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Topic: extreem slow/percise stepper control (Read 698 times) previous topic - next topic

ralphnev


i would like to drive a stepper on the order of 1000's (5000-10000?) steps per 1/3 of a revolution
(a 400 step / rev .. 1.8deg/step will not work ...)

how easy is it to attach a stepper to attach a stepper to a worm/planetary gearbox ?

or is there a source of dc motors that could be driven at ~ .1 -0.05 RPM  (600sec/rev - 1200sec/rev)


ReggieTheDog



i would like to drive a stepper on the order of 1000's (5000-10000?) steps per 1/3 of a revolution
(a 400 step / rev .. 1.8deg/step will not work ...)
how easy is it to attach a stepper to attach a stepper to a worm/planetary gearbox ?
or is there a source of dc motors that could be driven at ~ .1 -0.05 RPM  (600sec/rev - 1200sec/rev)


Wow that's pretty demanding. To answer your question try this site http://en.nanotec.com/steppermotor_lowcost.html. The alternative is a something like a telescope taracker motor or is your demads are not heavy you might want to look at an egg turner motor that does 1 revolution every 2 hours.

ralphnev

hmmm .. nice ones --
a bit more serching has brought me to
www.servocity.com which has 
Worm Drive Gearbox (Vertical Shaft) Product # WDG30P
used with a
1 RPM Gear Motor Product # RZ12-3000-1RPM
gets me down to 30min/Rev which is roughly where i want to be ...
(they also have a 0.5 rpm .. 1hour /rev .... might be too long ...
not inexpencive & i'm worried about vibration but may have to try it ....

MarkT

For that resolution you may have issues with backlash - do you need to change direction ever?  If so
then a low- or zero-backlash geartrain will be needed.
[ I won't respond to messages, use the forum please ]

ralphnev

only need to change direction at the end of a run (1/3 of a revolution,10min or so)

I'm mostly conserned about vibration/ this mech. will be holding optics 

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