Re: [CAD_CAM_EDM_DRO] Re: BANDIT controls - recommendations?

Wally, The Bridgeport I use originally had steppers. It was pathetically slow and unreliable with the original AB drives. Some are using the new micrstepping drives with the old steppers and getting better results. If I had a choice, it would definitely be servos. Mine runs reliably at 120 ipm and would go faster if it had a higher voltage power supply. Usually run it at 100 ipm and that is fast enough. A stepper for driving the knee is inadequate. It requires gas springs, counterweights etc. I get rapids of 60 ipm on the knee with no assistance at all. And the system never loses steps. I changed over to servos and it was like night and day difference.

Ron

cnc_4_me <cnc4me@...> wrote:

> The existing steppers work awesome, you'd think it was a servo it is
> so smooth (but being steppers, the top speed maxes out at 2 inch/sec
> on each axis).

2 in/sec is 120 ipm, sounds fairly fast to me. Do you find this to
be a limiting factor?

I am still on the fence about steppers or servos, i have both motors
sitting here, could use either one. Just need to buy drivers.

Do you have experiance with both, your steppers sound like they are
working fine....


Wally





--- In CAD_CAM_EDM_DRO@yahoogroups.com, Doug Fortune

wrote:

>
> mpictor wrote:
> >It looks like I'm about to buy a machine with a Bandit control.

It

> >works, but I plan on replacing it. Can anyone give me any idea

about

> >how much would have to be replaced, if I'm to use it with EMC?
> >
> >I.e. are the drives any good? are the motors any good? power

supply

> >reliable? ... etc.
>
> My cnc SuperMax mill came with a Bandit control, driving nema42

sized

> 1100 oz*in steppers on 5 TPI ballscrews.
>
> The Bandit power supply put out 40VDC, I scrapped the whole

controller

> (anyone want to buy it?), and went with Gecko G201's and my own

72VDC

> 14 amp power supply.
>
> The existing steppers work awesome, you'd think it was a servo it is
> so smooth (but being steppers, the top speed maxes out at 2 inch/sec
> on each axis).
>
> cheers
> Doug Fortune
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