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MB-1-E Part Sixteen: The continuing saga
Submitted by MB-1-E on Sat, 06/23/2007 - 14:51
Since we last met, I've been riding my MB-1-E all over.
The controller works great now.
I swapped out the hub sprocket.
I did have a 60 tooth sprocket and changed that to a 72 tooth ... What a difference!
I can climb hills now, even the steep ones.
On the steepest of hills, I do pedal to help keep the RPMs up, but it's a dramatic change from the smaller sprocket.
I had one malfunction, that was the adjustment bolt for one of the struts that support my Motor/ Jackshaft assembly. It bent as the weight of the motor pounded down on it. The bracket rolled toward the back of the bike and therefor bent the bolt.
I straightened that out today with a little heat from my MAP gas torch. I protected the braze with a damp cloth and it bent back to nearly perfect.
I'll be beefing those adjustment bolts up in the future but wanted to ride the bike.
I went up a steep, long hill today and the bike did very well. I did encounter another problem however (I'm finding all the weak links in the system) ... the DPDT switch that I use to switch from Parallel/ Series to just Parallel gave out.
The hill must have been too much for it.
I had to pedal home ... thank goodness for Pedal Assist!
So a better DPDT switch is on the list.
I'm open to any suggestions.
It's a 24V system. Batteries have 36Ah@24v. I've got a 200A controller. Motor is a Scott 650W (3/4hp) with 30A continuous draw. (pulls much more than that on hills, I'd guess 125A)
Well back to the drawing board (as us draftsmen often say).