Re: [CAD_CAM_EDM_DRO] Converting a Bridgeport Clone

At full pressure, that will lift 250lb (114kg)

On 19 April 2011 14:59, wotisname <wotisname@...> wrote:

>
>
> Hi Roland,
>
> This alters the problem but I have just bought off Ebay and air ram of 1.5"
> diameter but with 300mm of movement, maximum working pressure 150 psi. I
> assume this will reduce the size of stepper needed?
>
> Regards, Terry
>
>
> >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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