Re: [CAD_CAM_EDM_DRO] Converting a Bridgeport Clone

Hi,

I just converted my bp clone and put dmm technology high torque servos on xyz. Completely satisfied with their product. My knee is still manual.

They're bigger servos than what your looking at with 14 bit (16k 'step' magnetic encoders). So that much of a reduction wouldn't be necessary.

Hope it helps


Rob

On Apr 19, 2011, at 7:38 AM, "Dan Mauch" <dmauch@...> wrote:

> I retrofitted my enco knee mill with a Ametek 600 oz in peak servo motor on
> the knee. Continuous torque is about 120 oz in if that. I am using a 2.5:1
> timing belt drive to the existing hand shaft. It's been running for about 10
> years maybe longer. I don't have a counterbalance gas spring on the knee so
> my speed in rapid moves is only 15 IPm which is fine for the parts that I
> manufacture. I see mno heating of the motor.
> In a stepper motor the faster it turns the less torque it has.
> You generally don't need a lot of speed on the Z axis . Most guys would go
> with 650Ncm motor.
> Dan Mauch
> www.camtronics-cnc.com
>
> On 19 April 2011 14:06, wotisname <wotisname@...> wrote:
>
> >
> >
> > It has been a long time since I posted on this group and I notice there is
> > not so much activity these days. Anyway on to my question:
> >
> > I have a Bridgeport clone and want to fit a stepper to the knee and I am
> > unsure of the size of stepper motor to do the job properly. I was thinking
> > of buying the motors from Arc Euro Trade here in the UK along with their
> > drivers:
> >
> > http://www.arceurotrade.co.uk/Catalogue/Stepper-Motors/Stepper-Motors
> >
> > If it takes 11.5 foot lbs of force to lift the knee and there are
> > 135.581795 newtons centimetre to one foot/pound, and I am thinking of a
> 6:1
> > reduction ratio on a toothed belt, what size motor would I need for
> reliable
> > operation? I am confused about holding torque and moving force.
> >
> > Would I need the stepper 160-010-00500 @ 4.2A 650Ncm or will 160-010-00450
> > @ 4.2A 350Ncm do the job?
> >
> > Regards, Terry
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>
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