Re: Transformers

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "apaulsalerno" <apaulsalerno@y...>
wrote:

>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "cnc_4_me" <cnc4me@g...> wrote:
> >
> > > > This is for a Bridgy Series l conversion using 110volt treadmill
> > motors as 100 volt servos.
>
>
> Is it really that simple? I can get Treadmill motors for 10.00 each.
> Just put an encoder on the back of it?

Yes.

The problem with treadmill motor is they coinme in vastly different characteristis.

I have a nice 2-1/2hp that has cogging, you can feel the bumps as you spin it slowly.
Very poor for CNC

It seems that the lower voltage units are better.

Another thing, the ouput shoaft is 17mm so you need to pull the motor apart and turn it
down to 1/2 inch or some such.

Do try to get motors with a rear shaft. teh motor shafts are not hardened so you can
easily score them. Really a bag thing is that to drill the back of the shaft, you would
normally put the reah part of the shaft on a steadyrest. The soft metal can score very
easily, AND the rear bearings on the 2 I pulled apart have both been needle bearings on
the shaft. That meand the soft shaft is also a bearing surface.

You can get by that by making a new motor end, that is if you are any good at making an
end and the brushes holders.

And, of course, the motors are long. and your encoder adds length.

I bored the read of one and reamed it to 1/4 inch to fit an encoder, then use locktite
bearing stuff to set it.

The cheap purchase can be a lot of work.

Dave