Overvolt drillmotors

Im not sure if I agree with the great Mr Stu (Sorry Stu!)on this one. You need to off set the extra weight of another speed controler against a simple on/off switch. He is quite correct about a momentery dead short (although its not a true dead short as the motor does have an inpeadence all be it a low one and the load reduces very rapidly as soon as the motor starts to turn) We have tried it both ways and experience shows that an on/off switch wins every time. We pull (in theory) around 110A on start up but that is for less that 1/4 second and if you do the maths that produces so little extra heat as to make no diference over all. What does matter is how hard the motor has to work to keep it all spinning. That of course is down to things like gear ratio, bearing and drive train resistance and overall motor power.(make sure your motor is powerfull enough for what you want it to do)
A speed controler will be a little kinder to your motor, but you will increase the spin-up time and you have the extra weight of the controler. So you need to ballence all this against a faster spin-up time and a hot motor!
Your choice!

The weight of a speed controller of 200g aint that much. LOL. But fair play to be honest. But like you said, its nicer on the motor after all.

But i thought once the thing is spinning - it needs effortless amount of power from the motor to keep it there. yeah true the motor is not in dead short, but it may as well be. LOL. Poor thing.

But also drill motors get mega hot anywya Glen, nothing too much to worry about though mate.

Mr Stu

But i thought once the thing is spinning - it needs effortless amount of power from the motor to keep it there.

Stu thats true in a well engineered bot where everything is on bearings etc but if its just metal on metal then it will take alot more to keep it up there.

Regards
Ian

Just an amusing thought....If you can engineer a bot with no bearing or drive train resistace...patent it quick, then retire on the proceeds!!!

Sounds like a job for mag lev bearings! :proud:

or a pure magnetic motor :D :D

http://www.perendev-power.com/http://www.perendev-power.com/

Back on subject :proud:...

Is there much interest in DeWalt drill motors for featherweights here? I think I may have found a reasonably cheap UK supplier of the motors and gearboxes (although some people might want to make their own geabox(s))

any one know any good drills that i can buy and have very good performance that are cheap and can work at 24v

Ali Team BYTE

Yes, DeWalts, but by cheap, I dont know what you mean.

NO i mean any drills in general i really wanted to get the woolworths 18v ones at 9.99 but they seemed to be completely sold out eveywhere ihave phoned if any one knows any good drills that arr cheap and i can overvolt to 24v please post here

Heres a few price quotes Ive got for DeWalts:
(which include the VAT but exclude P&P)

12v Motor (DW927K-2) - 28.00
12v All Metal 2 speed Gearbox (DW927K-2) - 32.00
18v Motor (DC759KA) - 30.00
18v All Metal 2 speed Gearbox (DC759KA) - 50.00
14.4v Motor (DW928K-2) - 28.00
14.4v All Metal 2 speed Gearbox (DW928K-2) - 32.00

Some of these prices seem really quite large (especially the 18v gearbox), does anyone else have any ideas on where to find reasonably priced DeWalts?

http://www.robotcombat.comwww.robotcombat.com is the only place i know of, but you have to add shipping and import taxes onto the price.

http://www.robotcombat.com/marketplace_dewalt.htmlhttp://www.robotcombat.com/marketplace_dewalt.html

I dont know about spare parts, but Grainger is well priced for tools. http://www.grainger.com/Grainger/wwg/homepage.jsphttp://www.grainger.com/Grainger/wwg/homepage.jsp

RS would have to be our UK equivelent of Grainger although the prices are probably quite different.

Speaking of magnetic bearings:

http://www.skf.com/portal/skf_revhttp://www.skf.com/portal/skf_rev