Re: [CAD_CAM_EDM_DRO] Converting a Bridgeport Clone

I would seriously look at assisting the knee before attaching motors. You
want to perform a milling operation, not a hoisting exercise. An air
cylinder either side of the column, hooked to an air tank, and fed with
regulated air gives an adjustable solution.

Gas struts are OK too, but matching the weight might be a problem, and they
are a bitch to compress if a bit too long to install. Counterweights would
work too, but they add too much to the moving mass.

Regards
Roland

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
>
>
>


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