Using gold motors

[glen]

hello,

i have been using 12v drills at 24v on 95mm wheels in my current thwackbot featherweight and am really not pleased with the performance (and the reliabilty of drills in general).

so im looking at stepping up to gold motors and was wondering what advice people could offer in regards to their use? (what is the best way to attach pulleys to them etc).

could anyone also comment on their performance in comparison to say drill motors? and would would it be possible to gear them to about 20mph top speed?

btw - im looking at using the 12v version at 24v with approximately 95mm wheels.

any help appreciated,
Regards Glen

Wooo,
First problem you had was probably running 12v drills on 24v....that€™s why they were unreliable. Don€™t make the same mistake with your gold€™s. The most you would want to over volt a 12v gold to is 14.4v. As ploughbot runs his 12v motor on 24v in his lifter and after about 4 lifts its red hot. If you must use 24v go for the 24v version of the gold motor....However remember you may need some serious size battery€™s as these motors are known as being un-reliable, good luck!

Regards
Dave moulds
Team Turbine/PLF

[blazerbotics]

ive used golds for just under a year, i have done very well. I have burnt two sets out, this is due to me thrashing them (if there not running full speed then there stalled!) You can get 20mph out of them, but will increase acceleration time. I run 24vs at 24volts, with 15amp CPU electronize controllers with 24v 3Ah NiCads.

The motors are well built, and are very powerful. The only problem is with heat, as the are totaly sealed, they get hot very quickly. Im drilling air holes in the next pair (Unless i move onto bigger motors).

[nemisis]

i think he mentioned a 4:1 ratio and it doing about 20mph, cant be certain though

Does any one know what gears would be best?

I have thought about Mod 1s but they seem to have a 6mm bore for the 8mm shaft of a gold. Any Surgestions?

Regards
Ian Mc

[stu]

Kittys used the Gold motors since - hmm well Gold motors came out - Kitty was the first to use em, and has not burnt a set out, damaged a set or anything.
24v gold Motors running on 14.4v - decent speed with 8:1 reduction and 150mm diamter wheels. 2 Stage reduction is the key to why things work decently. They dont event get warm on 14.4v and with decent bearings, higher voltages welcome
Oh we have holes drilling in Kittys gold motors, not to keep em cool (but it must be helping) but to lose weight, hehe we lost about 300g from drilling holes in them.

Mod 1 seem a decent gear size to use. have a 6mm bore? for a 8mm shaft of the gold - hmmm drill it out bigger?

Mr Stu

[fwsorg]

MOD1 is enormous for feathers. Heavies use MOD1! MOD 0.5 or 0.7(for dedicated push bots) are fine. MOD1 will just use up unecessary space and weight.

i use mod1s in alpha, not due to the power, but it means they can wiggle more, hence less accuracy needed, good job with me! I have machined abit off the gears but not much as weight isnt much of a problem

[geoff]

I think I have to go along with eddy on this one, MOD1 is a shade OTT on a feather, we have used MOD1.5(HD) on a heavy with Bosch 750s overvolted @ 36V and even that was probably more than was needed!
On Scopion Jr we use a pair of gold 24Vs @ 24V with a ratio of 4.5:1 through 2.5mm pitch, 10mm wide timming belts with 125 dia. wheels, as far as top speed goes Im not sure what it is, but anyone who has seen it drive knows it can take off across the arena like a scalded cat!
On the down side, as Alan rightly says they do run bloody hot!! and Im not convinced that drilling holes in them is the answer. I think the only way to keep them at reasonable temp. is to up the ratio to around 8 or 10:1 and make them work less hard!..down side of course is a serious reduction in speed, but this is in part compensated for by a proportional increase in torque. So at the end of the day, as with most things, you have to find a compromise that works for your machine!
On the other hand, if you want the ultimate soloution to your drive problems... http://www.robotcombat.com/marketplace_motors.htmlhttp://www.robotcombat.com/marketplace_motors.html
and check out the Thin Gap Motors