RE: [CAD_CAM_EDM_DRO] Converting a Bridgeport Clone

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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