Re: Treadmill motors as Servos

Hi Les,

I'm not sure HOW to calculate it on this machine I'm making.
I'm not after great speed...80 IPM would be plenty good.
It's only about half done. That's why I got interested
in using servos before I made all the brackets & hardware.

It uses 1/2-10 acme for a screw. I want it to cut 3/4" thick MDF
shapes. It'll have a cutting area of 28" x 32".

I'll rig it it to use a router or an R8 spindle, so the speeds
will vary between 1000 to 30,000 rpm. The reason for that is the
spindle is quieter and generates much less airborn dust. It's
an experimental thing to try out before welding up a good single
purpose production machine.

John





--- In CAD_CAM_EDM_DRO@yahoogroups.com, Leslie Newell <lesnewell@...>
wrote:

>
> Those pulleys are a lot cheaper than I can get them here in the UK.
> Shaftloc or other taper fittings are good. Apart from being a pain to
> make, traditional keyways have a tendency to come loose and wear. One
> machine I repaired a while back had a key that had worn nearly round.
> The keyway was a horrible mess as well.
>
> Have you actually calculated the reduction ratio you need? My mill
> worked out 4:1 but your machine may be different. What type of machine
> have you got and what materials are you cutting? What is the maximum
> rapid speed you want? Also what is your ballscrew pitch?
>
> Les
>
>
> kz1927 wrote:
> > Hi Les,
> >
> > Your consideration and experience is Greatly simplifying what
> > could be an expensive and frustrating, trial & error experience
> > for me.
> >
> > I am as grateful as a person can be.
> >
> > I'll go with the surpluscenter encoders...they're proven to work
> > on your setup. Plus I'll have a few spare motors for (something)?
> >
> > I'm looking at these pulleys
> >
> > http://www.sdp-si.com/estore/CoverPg/Shaftloc/HTD5_Pulley.htm
> >
> > I'd get a 20 and an 80 for 4:1 reduction.
> > I think I've got that right.
> >
> > John
> >
> >
>