Drills

[wardy]

Drills

thanks for the advice guys, i think ill get a pinion puller, seems the best bet; not got much in the way of workshop accessories for preparing metal etc. Next silly question then, whats the best way to keep it on the model cars shaft....

http://robotwars.00server.comhttp://robotwars.00server.com

[Guest]

Drills

thats simple. you can press the pinion on the shaft easily by using a vise. the shaft normally comes out a little on the rear side. all shafts of this 540 or 550 series have a diameter of 3,17 mm (must be some odd inch unit) and the same fixing holes. For more security you can add a drop of loctite (if you want to remove the pinon after glueing, you have to warm up the pinon with a lighter or so).

regards
Helmut

[glen]

Drills

have many people had problems in the UK with the pinions in the gearboxes shearing and the gears shredding?? ive had really bad experiences with drills honestly.

also helmut, could you provide some more info on how you made that gear puller?

[wardy]

Drills

Thanks Helmut, just lookin for the right type of drills and Ill be sorted.

Thanks for you advice and have a merry xmas.

[jamesb]

Drills

You could always buy just the drill type motor and make a gearbox.

thats what I did.

Glen, sounds like your gears werent correctly meshed. They tear up real quick if even 1mm out.

If anyone gets sick and tired of drills, let me know on info@jamesbaker.f9.co.uk and Ill tell you how much my custom made gearboxes cost. They are not as cheap as drills can be, but they are supplied with motors and ready to bolt in. Choice of ratios and module. I can even do a double trouble gearbox which uses 2 motors to turn 1 output shaft. Quite neat.

[glen]

Drills

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

[robotic_ants]

Drills

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

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

[glen]

Drills

30-35:1

[team_ireland]

Drills

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]

Drills

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??

[maddox]

Drills

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.

[team_ireland]

Drills

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]

Drills

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.

[stu]

Drills

Thats what most people already do Ian mate.

Mr Stu

[glen]

Drills

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....