Drill motors

[banana_man]

I would go for smaller wheels, but Im doing a Maelstrom style featherweight lifter. the wheels need to be that big. Is there a better(but still cheapish) motor and gearbox alternative for this wheel size?

[banana_man]

CAD on profile. All to scale.

[typhoon_driver]

The main problem I can see is that you are going to be overvolting the motors and running them on big wheels. There is a way around it if you are using a decent radio control system such as a dx6 or 7 spectrum. You could always just adjust the travel on the sticks so that the motors never see the full 14V and in fact may only see around 10V. They should be able to handle this far easier and it will make the machine more controllable as such a high speed in the wheels will result in the machine being hard to steer

Its one of those cases where it is borderline and I am never a fan of borderline when it comes to my own machines as I have learned from many a blown up speedo or nackered set of batteries.

The good thing about drills is that they are that cheap that you could experiment and see if it works out.

nice CAD btw

(Message edited by typhoon_driver on December 05, 200

[banana_man]

thanks Gary. I do have a spektrum DX6 and that sounds like a great idea. The only reason I use 14.4 is for simplicity. I had 2 7.2v packs so I thought id use them.
Tanks about the CAD

[Gaseraki]

I do like the look of donnar what you have called you feather
Makes me want to eat a kebab.
I think your going to be putting a lot of strain on those drills if you set them up like that.
Not only are they going to have to shift a large amount of weight from the back, you will virtually have no torque.
You are going to hit some one and stop.
I was able to get away with my setup because
1. The wheels were in the middle of the robot
2. The robot weighed about 6.5 kg

It might work but I recorn you will break drill motors like no tomorrow.
I suggest maybe stepper pulley from the drills to the wheels? Also try putting as much weight away from the front end.

Hope that helps

[john_frizell]

If you have 19 cm wheels there is no need to overvolt your motors - you will be going fast enough as is. I have a 12 kg feather that uses 9.6 volt drills driving 18 cm wheels and have had no problems with it.

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[aero_storm]

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