Beer Buggy: Sprocket to me.....

Ok to add drive to the wheels from the motors I have (see the electric bike blog) I could either go for direct drive, belt drive, chain drive or friction drive.

Friction was going to be it, but I eventually changed my mind and went for chain...

So, sprocket ordered, biggest I could find and thankfully smaller than the wheel...

Now the centre hoole of the sprocket was too small for the bearing to go through, need widening out, the original hole was 24mm, hole required is 38, so another 14mm, or 7mm in radius terms...

Now the maths is done we just mark the hole 7mm larger, align the ruler with opposing teeth on the sprocket, add 7mm, make a dot, join the dots, this is not precision engineering, but its accurate to a mm and that's more than needed for a floppy chain drive...

Nothing in my tool box to cut that with so its the trusty hand drill, and ever increasing circles....

Once its all cut then its time to knock it out with the screwdriver...

Issue then is its a bit rough... no problem if you have a drum sander...

If you dont then its no problem if you have sandpaper electrical tape and a drill..

In no time at all, well about 15 minutes, we have a very good fit to the wheel

Now its time for some motor work....

The motor is from a peugeot 406 radiator I think, there about 200watts at 13.5v, common size for a few cars, I did try another car first and it had smaller motors, will keep them for something else.

It has an issue....

The washer there for scale and size is a 100 ID washer, so as you can see the output shaft of the motor is only about 10mm across and about 10mm high, not much to work with...

So, trial connection number one in a hopefully short run of trial and error is this...

Its a 10mm nut from something, dont where i have got it from, so if something falls off something else then i'll guess thats where it should have been fitted....