Home made motor run in tool

[PaulRotheram]

Hi all, me again, no come back dont run away :D

after discovering most people run there motors in (most meaning top boys) i thought id try and buy one from a store, like most do. but after seeing the prices on these (stupidly expensive) i thought id make one my self and share it with you :?

the design is very simple, basically its a box with a heatsink on it, 4 wires, amount of cells you wish to run your motors in with bearing in mind each cell is 1.2 volt i have been told the norm is 5 volt, but a few others think its too high,soon find out?? a pair of croc clips and two corrallys.

basically found the centre of the box, marked it up and drilled two holes for the screws. i tapped the holes out and then screwed on the heatsink

http://i3.photobucket.com/albums/y99/paulrotheram/STA40172.jpg

Then added some wireing loom:
http://i3.photobucket.com/albums/y99/paulrotheram/STA40179.jpg
two corrallys are used to charge the cells up via charger and two other wires connect to the motor

battery placement:
http://i3.photobucket.com/albums/y99/paulrotheram/STA40175.jpg

final produce:
http://i3.photobucket.com/albums/y99/paulrotheram/STA40173.jpg

the heatsink is used to keep the motor in place whilst the motor is spinning, and also acts as a cooler to keep heat and wear away from the motor whilst its being ran in!

simple, and cost bugger all to make cause i had all that in my pitbox!

bored you all enough now i suppose hehe.

[DCM]

Paul, thats a cool idea.

[Southwell]

Thanks, it was a cool idea of mine :P

[jimmy]

now you just need a way of varying the voltage!
anyone ?

[SimonW]

variable pot style resistor from RS they cost about 50p

[Southwell]

Indeed but if you run v2's then 4.8v is fine for it!

[DCM]

variable pot style resistor from RS they cost about 50p

don't think so, remember, yo uare going to be putting a lot more power than the 50p Variable Resistor should be asked to cope with.

Could always get a heavy duty multi pole switch, so you can switch between off/2/3/4cells?

[jimmy]

i suggested a tamiya 3 step speed controller but not sure how hot it would get

[DCM]

Only trouble with using any sort of resistor Jim, is that it is an extra drain on the cells thats where a decent switch would be good, as it is purely on and off not balancing power by allowing it to convert the unwanted stuff into heat.

Something like this http://www.maplin.co.uk/Module.aspx?ModuleNo=2343&TabID=1&WorldID=&doy=10m1

[PaulRotheram]

nice to see some nice feedback about it, and yes ian said he might make a jig for this useage.. but he hasent got off his lazy arse and done it, so i did so ner http://i3.photobucket.com/albums/y99/paulrotheram/slap.gif

i wanted to try find somthing that could limit the voltage if i ever needed to, but as DCM said it would need to be fairly decent to hold the current.

any one know of a decent diode to smooth out the current? when using it its obvious the current is varying slightly as the motor rpm drops a little every now and then during the run in period, i want it to be as consistant as possible.

[DCM]

Thats the motor not the power supply allowing little dips, yo uwould be best putting a pair of cells in parrallel, so it got more 'capacity' to see paul.