Homebrew_PCBs

I just had a look at the website of a model shop and voila they have
speed 600 motors at reasonable prices. While rc car motors are
incredibly expensive the cheaper motors can be found in the rc plane
section. Speed ratings differ from model to model but are roughly
between 12 and 18 k rpm. I think I'll get one of those.

Regards
Martin




--- In Homebrew_PCBs@yahoogroups.com, Stefan Trethan
<stefan_trethan@g...> wrote:

> On Thu, 22 Jul 2004 13:36:25 -0000, cruizzer77 <atlantis7@g...>

wrote:

>
> > Yes that's it! The 3-hole version works basically. I actually did
> > angle the holes a bit and at 7'000 rpm the water splashed out of

the

> > holes up to about 5 cm from the bottom. The drill I used to drive
> > cannot spin faster, so it seems as if I needed a high speed

motor.

> > Once this is done I will probably also try a base plate with only
> > one hole in the middle. Does someone have an idea from what kind
> > of "everyday device" a motor with a speed range up to 10'000 to
> > 12'000 rpm could be salvaged? I think not even a vacuum cleaner
> > spins that fast, apart from the fact that those motors are
> > considerably large. Another problem will be that my bearings in

the

> > condition being will not withstand those high rpms.
> >
> > Regards
> > Martin
> >
>
> smaller DC motors (like for model building) are build to spin that

fast.

> For higher
> power look at grinders, angle grinders and straight grinders that

is.

> You have good chances a "universal motor" (the kind with carbon

brushes)

> is that fast,
> where a "squirrel cage" motor without brushes is surely not.
> You can also buy a $10 "dremel clone" they have a 12k or so 100W

motor on

> ball bearings,
> basically nothing else.
> Model building motors (which in fact are simply small industrial

permanent

> dc motors
> like Johnson and mabuchi makes) can obviously be bought in model

building

> shops.
> (look for "speed" 550 or 600). You can find a 550 or 600 in every

battery

> handheld
> vacuum cleaner.
> I'm not sure about other universal motors like big vacuums, or

power

> drills without
> the gearing, but looking at a power drill output and contemplating
> the gearing ratio it might well be enough on the motor.
>
> ST