Re: Sync motor(s)

["acmnovak" <acmnovak-at-msn-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Thanks for the advice everyone (especially sundog).
I'll go and get myself a angle grinder tomorrow after work... This should
prove to be quite interesting seeing as I've never used an angle grinder
before. Maybe I'll practice on my cat first (just joking btw...)         :)
Yeah, my armature measures about 1.59inches in diameter (39.7mm). How deep
should the flats be on the 1/4hp motor? the 1/15?
I might take my 1/4hp motor to my school metals class so that I can have my
teacher grind *perfect* flats in it. I really don't want to screw that up
because motors are not easy to find around here....
Thanks again,
-Michael

> Michael,
>
> I don't use the dead pole method when I modify my motors,
> but it might be OK.  Your armature is probably very small in
> diameter, maybe 1.85" or so.  So if 1.5cms is about 1/3rd of
> that diameter, that seems reasonable.  I usually make the
> flats 1/3rd the diameter of the armature for an 1800 rpm motor
> which gets 4 flats.  The 3600 rpm motor gets only two flats.
> I've only modified one 3600 rpm motor, and I made the flats
> more than 1/2 the diameter of the rotor, but it worked fine
> anyway because it's just not that critical to start with.
>
> The flats don't have to be perfectly smooth, but you can easily
> smooth them with a file after you're done using the angle grinder.
> It makes it easier to measure them and make sure they're the
> same sized and distance from each other if their smooth and
> regular in size.  If the motor vibrates too much when you're done,
> then you know they're not evenly sized or spaced, and that the
> motor is unbalanced.  You can balance the rotor by placing
> the shaft ends on two razor blades on edge, to see if the rotor
> rotates to a heavy spot.  remove some metal from teh heavy
> spot until the armature no longer rotates "falls" to the heavy
> spot, etc.  It's easy to remove enough material, esp with a small
> motor.  Even with the large motor, you can do the job with a large
> file which is what I often do.
>
> John Freau
>
>
> >  Thanks
> >  -Michael
>
>
>
>