36:1 - 24:1 Drill gearbox Conversion

**PJ-27** · 20th March 2013, 14:33

Cheers!

**typhoon_driver** · 20th March 2013, 14:37

I've always used copper grease. Two reasons,

1) It's good at high temperature applications and if your gearboxes get stressed that could be the case
2) I always have it in the garage for working on the car

**RogueTwoRobots** · 20th March 2013, 18:10

That CV Lithium grease Ellis posted can be bought at your local Halfords for a few quid. Got myself a tub of it the other day, don't see me running out for a few years yet!

**Ellis** · 20th March 2013, 19:02

I believe Halfords is where we got ours.

**Bodge Job** · 20th March 2013, 19:43

i use lithium based grease as well. but regarding the gearboxes im doing it but i would be cautious about it, there will be a load of more strain on the motor. Wouldn't suggest anyone with 2 motors to do it, and those with 4 wheel drive should still be careful about it.

I plan to test them at many events before I go to the champs, as I can imagine motors going up at the champs so I want to see if its worth it before actually competing with it. And those who are doing it, good luck! would be cool to see how it goes though. But i wouldn't suggest blocking tho motor vents like some people do, as i think that would be the last straw for the motors. And heat sinks would probably go down well.

**Ellis** · 20th March 2013, 19:54

I don't think it's going to be an issue. Our robot is in no way struggling to move around, it's virtually the same as it was before in terms of grunt, which leads me to believe the motors can happily handle it.

Two-speed cordless drills with 550 motors go to at least 24:1 as they often have a 900rpm option, and they're commercially designed to take the stresses of years of drilling. Plus many people use the 16:1 Banebots gearboxes without issue, which is even more extreme.

I'm open to it being a problem but I don't think it will be.

**RogueTwoRobots** · 20th March 2013, 20:17

Only just remembered that the old Kaizer Mk.3 version ran 24:1 gearboxes onto 100mm wheels at Rebel Robots and the UK champs in 2009. It flew all over the place, and would powerslide nicely in the larger Rebel Robots arena. Shame it wasn't the easiest to control. The motors were 16.8V ones running on 24V and we never had a problem.

**Liftoff** · 21st March 2013, 11:30

Had a go at the makita motors I have on Liftoff and took the gearbox apart - it does not look anything like the GR02 gearbox though!

Its got 3 stages instead of 2, and the ratio is 48:1! No wonder why its so slow... :| Apart from that compared to the GR02 both motor and gearbox are enormous and weigh a tonne!!

**daveimi** · 25th March 2013, 19:55

I was reading through this and it struck me...rather than mess about with stripping down old stuff would it just be easier to spend thirty quid on some fresh Gimson's?