Recent content by bike_electric

Not sure on the weight of the bike but it's pretty heavy as the my1020 motors weigh a fair bit. The reason the whole reduction system is mounted so high is because of the width of the thing, it would hit the pedal arms if mounted any lower so would make pedalling impossible. I agree the...

Hi everyone just a couple of pics of my built bicycle. It achieves around 25mph using 4, Turnigy 11.1v 2200mAh batteries in series to give 44.4v or 48v+ hot off the charger. The only problem is they run out too quick as my 48v 1000w electric scooter controller must have a cut off at 42v...

Ok will have a look round at others projects and see where they have positioned things. Just that if mounted where i wanted it, in the middle of the frame the motor may extrude out either side of the pedal assembl,y and therefore would make pedaling or infact just using the pedals as foot rests...

Have just drawn up the reduction system based on the one i found on this forum earlier in my topic. The funny looking part on the right hand side of the jack shaft is a bicycles rear wheel hub cut in half and the freewheel adaptor part is retained so that a bmx freewheel sprocket will screw on...

Thanks for the link, yeah i could use that but since i've just butchered a bicycle hub and got the cassette freewheel holder part i will try and use this. Basically i just cut the actual wheel hub in half and the internal diameter just need boring a little to fit my 20mm jack shaft. Only...

Right, i thought that bmx freewheels on the rear wheel hub were left handed threads. But when you take a cassette of a mountain bikes rear wheel hub you have to unscrew it counter clockwise so therefore the thread is the other way round to that of a bmx's hub i thought, but as you just checked...

Thanks for the info. Just out of interest do you have any pictures of your assembly. I'm not sure if a bmx freewheel will screw onto the cassette type freewheel adaptor hub part as the cassette screws on clockwise whereas bmx freewheels are left handed threads, so would this mean i need a bmx...

Yeah i mean the threaded part which the cassette screws onto on say a mountain bike. What i was going to use it for is to secure a freewheel onto the motors reduction systems jackshaft by building/constructing a part to weld or secure on somehow to the freewheel adapter using the side where the...

Thanks for the help Bandaro, so what i'll do is take the complete shaft out of the motor and then have both of the steps machined down to accept an 8mm or so thread (same as the original thread but just longer) to hold the pulley on properly. Failing this, i thought i could machine out one end...

I've got my belt with pulleys and a bicycle pitched sprocket to mount to the jackshaft but have come to a problem. The problem is that the smallest pulley which attaches to the motor will not be able to fit to the motors shaft properly. This is because there is only a small amount of thread from...

Thanks for the heads up. I'll be using a bicycle chain as the sprockets on the freewheel crank are the 1/2" pitch which i think bicycle chains are? When i get it all assembled i will see whats what and go from there if anything needs altering. Evan.

No worries, yeah crank part with the pedals, thought i was doing something wrong for a minute, as it took me a while to figure out the crank rpm calculations :D Will post up some pics when i've got the reduction system constructed and the parts arrive. Evan.

The reason for choosing the 24:1 reduction ratio to the crank is so that i can get a crank rpm of around 125, usually people on here are trying to achieve a crank rpm in the region of 80-120rpm. I am intending on using the unite MY1020 motor for a while and then when funds allow go for an RC...

Pareabellum: thats a shame to hear that, hope you get it sorted soon. I've decided to go for a 12 toothed pully to a 72 tooth for the reduction (from motor) then from this i will run a 12 tooth sprocket down to a 48 tooth freewheel crank assembly. This should give me an overall reduction of...

That looks great, how is the motor connected inside to the clutch housing part? I don't suppose you have used the dirt bike/mini moto centrifugal clutch attached to the motors shaft? I thought those gearboxes have cogs inside as i've taken them apart before, unless i'm mistaken, maybe i could...