Help with gearing

[brian]

Hello Martin,

The axle may be hard to saw but I would not have thought it would be made out of stainless steel.

This is a comparitively expensive engineering material and holds no real merits for a nearly totaly enclosed axle.  A magnet might prove the point.

But anyway, that does not answer the question posed:-

I am not familiar with your setup as I have used wheel chair motors similar to the ones supplied by Richard of Toylander, but I would have thought that provided the cutting is done in short runs and the temperature of the diff. oil is felt to make sure there is no sign of overheating, then this should result in an amputated lump of whatever metal.

I would make sure that the hacksaw blade is new and tightened up well and try an 18tooth blade as a starter, be carefull as the blade bites deep, as cut might grab the blade and these motors have a fair amount of torque which could do you some serious damage under a worse case scenario.


No loose clothing and some one adjacent to switch off while you are doing it please, just in case.

Regards,

Brian

[multisync]

Hi Martin
The axle may be very hard but I don't think trying to cut it when it is spinning will be very successful. I have tried this in the lathe (against advice) and found the cutting rate quite slow. An angle grinder may be the best bet if you protect the moto/diff against grinding waste.
Be careful
Walter

[martin]

I might be late to this thread, but I found this following link very helpful with figuring out gearing:

http://www.diygokarts.com/speed-calculator.html

[steve]

In case anyone is interested I went down the option of 2 24v wheelchair motors mounted to a home made frame below the vehicle,  The wheels are toylander , but the bearings have been removed and a boss turned up and fitted so the wheel is direct to the motor gearbox . as the motor is braked there is no need for brake pedal which has proved invaluable when the vehicle is bieng driven by young persons who are not fully competent drivers . I have been running this setup for about 2 years now, having previously had a single 24v motor unit which gave me many problems over a period of about 6 years.

[tomo256]

Hi Steve.
I also have a pair of 24 volt wheelchair motors with magnetic brakes that i was considering using, but decided not to because they only do 113 rpm which is quite slow, but wheelchairs tend to be slow by design, and i thought that by gearing them up to do 4 mph i may lose a lot of torque which i need as i live in Pembrokeshire which is quite hilly. This however still remains an option if my scooter axle does not work properly.  Can you tell me if your motors have the rpm stamped on them and what speed you are getting out of them.

Regards Martin

[steve]

Rpm not sure so will go and have a look later, but when holding a gps the speed is 4.1 mph