Re: Specs on Sigma Stepper for Series I Bridgeport?

Hi Les,
I sold off my original steppers, wish I could try that( your
suggested ) combo again. Is yours a series I or II? table weight may
be the difference. Tahnks I'll file that info my stepper archive
stuff.

-Lee

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Les Newell <les@l...> wrote:
> Hi Mike,
>
> I experimented with the Sigma motors on my Bridgeport and found the
best
> overall performance was by just using 2 coils:
> 2 connected to phase A+
> 8 connected to phase A-
> 1 connected to phase B+
> 6 connected to phase B-
> The other terminals are left unconnected.
>
> With Geckos set to full current and with a 75V supply I get
reliable
> 2.4m/min (96IPM) rapids and plenty of torque.
>
> My power supply is based on the original 110V transformer. If the
> transformer is rewired to twice it's supply voltage (in my case
460V on
> a 230V supply) then the output will be 55V. When rectified and
smoothed
> the result is 75VDC. The rectifier and smoothing caps are rescued
from
> the control cabinet.
>
> Les
> >>
> >>For the Sigma motors:
> >>(identified by 8 terminals in pairs with a plastic partition
> >>between the terminals of each pair)
> >>
> >>To connect the phase windings in series and set the controller to
max
> >>amps ( GECKO wiring recommended for orig BP type
steppers*********)
> >>terminals:
> >>6 jumpered to 5
> >>3 connected to phase A+
> >>1 connected to phase A-
> >>
> >>8 jumpered to 7
> >>4 connected to phase B+
> >>2 connected to phase B-
> >>
> >>
> >>