Re: Brushless Motor Spindle with CNC desktop machine

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "pydick" <rondick@p...> wrote:

> The problem with these types if motors is that they were not
> designed to take the side loads we apply in a milling situation. I
> would not expect them to last long unless you were milling something
> very soft, at very slow feed speeds.
>
> Ron

The toy car motors have roller ball bearings. but at $65 a pop, they
better !

Mine is mounted in line with the spindle. Not to the side with a belt.

I am using an E-Bay special for the speed contorller, just got it all
soldered up, now I need to connect it to a PC powr supply for the 12
supply. I hope the amps are there : )

There seem to be lots of speed controllers on e-bay, so finding one
should not be any problem.

Dave

>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "baccus61" <richmcm@a...>
> wrote:
> > hey everyone,
> > I am building a small desktop 3D milling machine and needed a
> > brushless motor for the main spindle. I got sick up and fed of
> > changing brushes on the prototype I built, and a brushless motor
> will
> > also be much quieter for indoor use and last a whole lot longer.
> > I purchased a model aeroplane motor - AXi 2826/10 motor (rotating
> > outer housing for better torque and the rotor doesn't throw off
> it's
> > windings) with an "easy 25" 25amp controller and I need to know how
> > the controller signals are sent from the RF module to the controler
> > and the type of pulses. In the "easy 25" instructions it lists
> > positive pulses at 1.5 ms with a period of 10 - 30 ms. What voltage
> > would these be. "3v - 5v"? and are they continuous pulses. If this
> is
> > the case then I think it would (maybe)be a case of programming the
> > software to use the 4th axis as the speed controller and inputing
> the
> > appropriate commands into the G-Code
> > These motors spin around the 10K-20K revs at 12V(and faster) and
> pull
> > up to 40 amps so the power is there for a small Miller but I am not
> > sure how they would react to a filtered DC power supply with the
> BEC
> > (Battery Economiser Circuit).
> > The best case scenario would be to just have a switch to turn the
> > thing on and off and if anyone out there has a way of doing this
> > (small circuit board with a pulse module?) then that would be
> great if
> > they could contact me about doing this or better still post here.
> > If anyone else has any ideas Idea about controlling a brushless
> motor
> > with a CNC spindle then I will be forever, eternally greatful if
> you
> > could let me know how you can do this.
> > I haven't found anyone else doing this sort of thing with radio
> > controlled stuff on CNC machines so maybe this will be a first and
> if
> > it works the we can tell all the other CNC people out there how to
> do
> > it and I know they will be greatful as brushed motors just aren't
> > cutting it when it comes to running a CNC/engraving job for 9
> hours at
> > a time. The brushes wear out after a very short period of time and
> > usually halfway through a job and I know you can all sympathise
> with this.
> > Please help.
> > Warm regards
> > Richard.