Ok I found out that th 50cc Rotomax has 28poles. That would be max 2860rpm for the X8M06-c controllers
I would have to rewind them to 57KV :lol: Guess i'll stick to the dual N6354 solution, it's cheapest, most simple and most lightweight and will still run almost silent. Any thoughts here?
went further with the CAD design and renamed the thread to "Coaxial-BB-Jackshaft Middrive with TGY Rotomax 80cc Build/Design". It's still the thing with counter rotating Jackshaft, a bit like the Panasonic drive (view
http://endless-sphere.com/w/index.php/EBike_Motors_Middrive#Panasonic_Configuration)
There is a detailed pic of the BB-coaxial-Jackshaft-Hub, that I can fabricate with home tools and off the shelf parts - just like I always do...
The bearings will be aligned axially by locktite, also the freewheel will be screwed on the BB-Cup with locktite, since there will be only 5 thread turns engaged to it.
Metal plus Metal Glue has proven to be a bomb proof combination. Just watch Doctorbass test videos!
How I will machine the assembly:
For machining the sprocket adapter, i will make a plate with 150mm outer dia and a 16mm bore, since the 95T 6mm sprocket that comes from maedler has a 16mm bore. This way I can match the connecting holes so that the sprocket is centered perfectly. I will then insert chain wheel screws to connect them.
In the next step I will cut the sheet, so I can bend the four freewheel attachments. After bending them in a 90° angle, I will cut/file the final hole that fits the BSA threads. I will file it to about 32mm and not further to the final 34mm yet.
How can I file this so that it gets centered perfectly? I use the 16mm BB-shaft and insert it to the BB-Cup with a bearing. this way I can always test if I already filed too far in every angle. The 95T sprocket from maedler still has the 16mm hole! The fact that this matches, is a stroke of luck
This is somewhat time consuming, but it proves to be the best way if one has no large lathe. Got some experience now from the Hub-to-middrive-motor-conversion and some other projects, I want to share for DIY people. Still, using this technique, I have spend less time than it would have taken to buy a large lathe I guess
Maybe such things can be done on a 3D printer in the future, just have to use it as a CNC mill... hope there will be multi-purpose machines (3D-printing, Laser cutting, plasma cutting, CNC milling and turning for plastic and alloy.... and so on with ONE small machine, it's possilble! And it should be programmed easy and quick! Maybe I should build that one in 2014 instead of eBike #7 :lol: