Drills

[glen]

ill give you a quick email within the next day or two

What is the average gear ratio for a cordless drill ...?

Chris - http://www.featherweights.org/forum

[glen]

30-35:1

Problem.

I need to mount my wheels onto my drills but my wheels have a 12mm bore and my drill has only a 3/8th inch shaft. How am I going to get the wheels onto the drills? I have the chucks so can use them if needs be

Regards
Ian Mc Donald

[glen]

there are a ton of ways to do it,

so to determine which way, a few questions -
1) can you put a shallow groove in the hub of the wheels? or are they plastic. if so try the method i described earlier, works 100%

2) how wide are the wheels? - if they are thin. try putting the wheel on the shaft, then the chuck over it and tighten it up, there *may* be some slippage but it shouldnt come off.

if you get a bit restless with other methods you can buy 95mm wheels that will screw straight on the shaft with no trouble at all.

you may be able to make a plug to go inside the wheel??

Thanks to Stu I know that drillmotors and gearboxes arnt a bad way, especialy with custom gearboxes, way smaller and stronger than the original plastic housing.
But latest discoveries(and I guess James did that aserious wile ago) let us think about mini gearboxes like Kos made for the heavies.
The KOSboxes, all of them are still functioning, some even after a serious mistreatment(Gravities for example)without any serious damage.
So RC motors are easier applicable in the feathers.

Hi

I found a cheep and relatively easy way of mounthing my wheels.

1. Take the wheel and put a M10 bolt through it. Secure it in place with e-poxy resin (If the hold is bigger than 10mm then use some packing to make it smaller. I used some 1mm H.I.P. that i had lying around. Is working well)

2. Cut the bolt to size.

3. Place the bolt into the chuck and tighten it by hand or by key as much as possible.

4. Take some duct tape or simular and wrap it around the chuck to provent it from opening.

5. Mount your drills in the usual way.

This was has worked well so far for me. I will report if it fails.

Regards
Ian Mc Donald

[glen]

if you want ian i can send you a photo were a saw has just clipped the wheels and taken them straight off,

you should be able to get away with it for a demo bot though, thats about it.

Thats what most people already do Ian mate.

Mr Stu

[glen]

back from australias first public event and ill say just this regarding drills.

you can use 12v drills at 24v. we had about 4 robots doing it and not one suffered a broken gearbox or burnout. they also have awesome power and speed, my 9.6v drills at 12v on 150mm wheels were quite pathetic in comparison.

just if you decide to use this setup use wheels smaller than 100mm and use a PWM speed controller, this helps alot in not breaking gearboxes.

i know what ill be doing next time....