Re: Brushless Motor Spindle with CNC desktop machine

I agree, cooling will be very important with these types of motors.

However, Did you ever consider making your own brushless motor to
suit your needs? Larger diameter for higher torque for instance. The
R/C aircraft folks have a whole group who assemble & wind their own
motors. It's really very simple. And, since we are all CNC types, it
is even easier.... Cad design the armature plates, CNC mill them,
turn the end bell to fit a standard steel tube, glue in super
magnets, add a bearing housing & yer done. Not a bad project to fool
with. (The DIY Brushless motor activity started with R/Cer's
rewinding CD Rom motors to suit their needs.) The motor controller
you could buy, or some EE out there could whip them up, and Viola! A
whole new cottage industry is launched.

CSS
--- In CAD_CAM_EDM_DRO@yahoogroups.com, "baccus61" <richmcm@a...>
wrote:

> Hey Dave,
> Heating will be an issue with these motors but I intend to supply

a

> cooling fan to it or even the exhaust from the vacuum cleaner from

the

> dust extractor (which may also be a little hotter than needed)
> The AXi motor I purchased has a 3 bearing spindle with 5mm

hardened

> shaft so that should be quite sufficient. The outside end of the
> housing has 3 bolt holes that could be used for a BALANCED fan also

to

> draw air through the motor with maybe a small coweling surrounding

the

> whole affair, controller included as this will also get hot. I

really

> like these motors and I noticed on their website that they are now
> producing a 53xx series at 85Amps. One hell of a small motor with
> price tag to suit! All up, the cost of my setup will be about the

same

> as the Makita trimmer I purchased 4 months ago.....$242Au. Once you
> have stuffed up about 3 x 5-8 hour jobs with the cuts almost 3/4 of
> the way through, then the brushless motors look a pretty darn good
> option. :)
> RM.
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "David Bloomfield"
> <davidbloomfield@g...> wrote:
> > Many of you are looking at the power figures for these brushless
> > motors and you must keep in mind that these ratings are with the

motor

> > sitting in a blast of air from the prop. If you plan on using

them in

> > a router/engraver, then a large heatsink and fan must be used to

keep

> > temperatures under control. Also, I would only look at the larger
> > motors. The small 20mm motors like those on ebay have a tiny

bearing

> > and shaft so you would need to drive a seperate spindle to get any
> > sort of stiffness and longevity. Check out some of the motors on

the

> > link below.
> >
> > http://www.nesail.com/categories.php?subcatID=40