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