Re: [CAD_CAM_EDM_DRO] B: Brushless motor

Tim,
It just happens that Sherline (direct) has these on special discount this month
and a dealer may offer more discount to boot :-))
RichD

Tim Goldstein wrote:

>
> I am trying to remember correctly, but I believe you were using the
> Proxxon tool as your spindle and that is the DC motor we are talking
> about?? If so it is no wonder you are burning them out. It is a nice
> tool, but it was never intended to run for hours straight. Yes a
> brushless motor would be an major improvement, but as you said they are
> expensive and beyond your budget. We are trying to point you to
> solutions that will give you reliability at a cost you can afford. If
> all you want is a brushless than go get the money and be happy.
>
> Now if you are willing to compromise there are lots of other solutions.
> First question is if you are dumping the Proxxon tools as your
> spindle/motor what are you going to use for a spindle? You keep saying
> you want a brushless motor, but you have not talked about how you are
> going to connect it to a tool bit.
>
> If I were you and I needed a motor and spindle that would be reliable
> and reasonably priced I would either go with a Sherline headstock with
> motor and controller set up for 10K rpm. It is a straight bolt on and
> ready to run unit including a VERY sturdy spindle. It is not cheap at
> about $290 at discount in the USA, but it solves your problem as soon as
> it arrives and it will run all day long. The new Sherline motors have
> externally replaceable brushes so if they do burn out you can have it
> fixed and ready to go in about 5 minutes. Now if you do have a spindle
> already then just get the Sherline motor and speed control. It will save
> you about $100 without the spindle.
>
> Tim
> [Denver, CO]
>
> > -----Original Message-----
> >
> > Well,
> >
> > I'm sure I ran the motors longer then they were intented to,
> > and that's why they melted down. I did'nt use any of them for
> > more then 10 hours, before they died. Granted, the first one
> > died because the endmill got stuck, and I did'nt notice till
> > it had been hold tight for around one hour. The other, the
> > bearings died. It's still running, but very slow and noisy.
> >
> > So I was thinking that a used brushless would help me.
> >
> > --Michael
>
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