Rube wrote: ↑
Apr 18, 2018 5:32 am
Hi Maddin, thanks for posting, quite an inspirational build. Interesting use of adhesive. Couple of questions if you don't mind, did you include a 'fence' on only one side of the pulley to aid machining? No need for a fence on the second side?
It is called belt guide flange
yes as this pulley is CNC machined i went this route. Normally such guide flanges are separate parts which will be attached to the pulley after the tooth profile was made.
I don't know if it would need a second flange, but if i spin it by hand now the belt stays on the pulley, and afaik the sprocket from a Zero also has only one flange.
Looking at the bolt pattern on the swing arm, I'm wondering if you drilled through each side of the chainstay to a second bottom plate?
No second plate, but plenty of bolts screwed into the tubes and beside them with plenty of "liquid steel epoxy" everywhere and between.
I have done lot's of work on it, drilling holes, fixing it onto the work bench etc and i cannot see any cracks or similar signs of fatique so far.
The Quick Steel has a strength of about 10-20N / mm² and as the surface area is so large i believe it will be up to the task which will be about 150kg pulling force on the belt leading to 200Nm on the wheel.
Time will tell if it holds.
check out the pics!
ridethelightning wrote: ↑
Apr 17, 2018 5:29 pm
Thats coming along really nicely!
great pics as usual.
were the parts difficult to source? what was the cost of the belt, pully and hub aprox?
I can tell you that parts for this kind of belt drive are very difficult to find. I think i had luck that Pfeifer Industries had the pulley i needed in stock and even a taper wall bushing for the 14mm axle with a keyway. Custom fabrication for only one or two pcs would have been really really expensive.
18T pulley + Taper wall bushing was about 130USD
12mm 8M GT carbon belt 50USD
LMX Hub + cart sprocket carrier about 220USD
12mm axle for 150mm dropouts 20USD
Rim + Spokes 150USD
Aluminum plates + glue + bolts etc about 50USD