Re: bipolar o unipolar stepper ?

Hi Jan,

More than once, I have had Yahoo mess up and trash my post.

I found that once it does that, I copy to WORD and paste it, spell
check it, then when I can paste it over and over until yahoo will
accept it.

as for the www.geckodrive.com link, I think it may be in the links
section of the on-line CCED site.

Tim also has a copy of Mariss's post about the difference between
Steppers and Servo's.

Dave

--- In CAD_CAM_EDM_DRO@yahoogroups.com, JanRwl@A... wrote:
> Emme: I had already written a reply to every line of your inquiry (below),
> and when I tried to SEND, my stupid computer "locked up" and NOTHING could get
> things going again but "RESET"! So, I will try again, this time SAVING after
> every line!
> Which kind of motor do you prefer ? Unipolar o Bipolar steppers ?<<
> Bipolar, without hesitation! I would use Unipolar motors ONLY for
> replacement, where working driver-electronics were OK, and it was a simple "swap it out"
> situation!
> I'm designing a cnc table of 100x150 cm x 50cm height useful with
> mobile bridge (table fixed).<<
> This is called a "moveable gantry" design.
> Which motor power for the stepper do you think I need ? I like to use
> this machine to cut and engraving wood of 3 cm of thickness....<<
> You might be OK with "3-stack" bipolar Size-34 "high torque" (the new, square
> kind, "KML-" if Superior Electric make. You MAY need Size-42 bipolar for
> the longer axis, but that is difficult to guess, not knowing your precise needs
> nor machining-skills, etc.
> I hope to reach a tollerance of 0,1 mm for the machine.<<
> This is completely reasonable, even with 20 mm/turn ball-screws. I managed
> this with 25 mm/turn ball-screws in a 1.5 x 3 meter X-Y router nearly twenty
> years back with HUGH unipolar motors.
> What do you tink about ? It's a dream ? :-) ?<<
> No! If you have the components and/or money, and reasonable
> machining-skills, this is readily attainable for a clever person! If I could do it, surely
> ANYone can do it!
>
> I just tried to put a Gecko link here, and my system locked-up again! So,
> there's a "bug" in there, so I will just send this without the Gecko link, and
> hope Mariss or whoever will send you that, separately. Meantime, I hope to
> TRY to fix this dang mess here!
>
> Lotsa luck! Jan Rowland
> Texas!!!
>
>
> [Non-text portions of this message have been removed]