Re: Brushless Motor Spindle with CNC desktop machine

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