re:Re: maxnc/sherline

Well Dan is very knowledgable. You probally can not go wrong
folowing his advice. Make sure you get the correct voltage xformer
and properly rated diodes and capacitor. If you dont know what to
get ask Dan. Remember the DC voltage you get out of the unregulated
supply is 1.414 X the xformer voltage (assuming using bridge rectifer
and not using center tap of transformer). So a 24Vac transformer
gives you about 33.9VDC. So i would use a CAP rated at least 50VDC
and Dan could probally recomend the minimum microfared rating you
should use. I always build in a safty factor so i would use a bridge
rated 15 to 20 amps.

--- In CAD_CAM_EDM_DRO@egroups.com, "tauseef " <alieron@h...> wrote:
> hi
> I don't really have a setup yet so things are still "changable." I
am
> thinking of buying the camtronics 3 axis 2 amp bipolar board and
> using 3 180 oz/in 2 amp 2.1 volt bipolar steppers on my sherline.
Dan
> at camtronics suggested, if I understood him right, to get a 10 amp
> transformer and use that as the power supply which would be around
> $40. I would use a bridge and capacitor on it of course. Is this
> fine? Is there a better "resonably" priced 3 axis 2 amp bipolar
board
> I can get?
> thanks again
> taus
>
>
> --- In CAD_CAM_EDM_DRO@egroups.com, cnc4me@u... wrote:
> > What kind of drives are you using. Bipolar chopper drives should
> > have a current limit set. Also what kind of power supply.
> Regulated
> > supplies make bad chopper drive supplies because they dont have a
> big
> > enough capasiter in the output....Why dont you give a little more
> > info about your setup. Also guage of wire to drive and lenght of
> run
> > from power supply.
> >
> >
> > --- In CAD_CAM_EDM_DRO@egroups.com, "tauseef " <alieron@h...>
wrote:
> > > hey guys! thank you for the wonderful welcomes and its GREAT to
> be
> > a
> > > part of this wonderful group!!
> > >
> > > Thanks for the tips and suggestons Ballendo and Tim (and
others).
> > >
> > > I am not using the locking nut on the z-axis and have put the
> > motors
> > > on just as the instructions from sherline say, so that can't be
> the
> > > prob heheee. I tried last night to move the XYZ axis by hand
and
> > they
> > > are smooth as silk :) I adjusted the Z axis also as suggested
by
> > > sherline and everthing works well. The motors are very new, my
> > > brother bought them about 2 years ago in hopes to make a light
> > > drill/engraving machine but never found the time to. Now that I
> > have
> > > the mill he "gave" me the motors to try. I just think they just
> are
> > > not strong enough.
> > >
> > > I am plannig right now to counterbalance the z axis as you guys
> > have
> > > mentioned. I always wondered about all that weight up front but
> did
> > > not want to "modifly" my new machine. Now that I have seen some
> > pics
> > > of it, its much eaiser :) I like the idea of putting the motor
> > behine
> > > the z-axis and then maybe I will add spings later. I can send
> pics
> > > but can someone tell me how I send them to the "file" folder?
> > >
> > > You mentioned that the 2amp power supply maybe buring out my
1amp
> > > motors? Don't the motors draw as much amps as they need even if
> you
> > > give them a more amp power supply. If stalled will they not
draw
> > MAX
> > > amps regardless of the powersupply?
> > >
> > > I spoke with Dan at camtronics and he suggested I use a 10 amp
> > > powersupply for the 180 oz/in 2 amp motors I plan to use. Will
> this
> > > not cause the same problem? I do not doubt what Dan has said
but
> am
> > > wondering.
> > >
> > > thanks again guys!
> > > taus