Endless Sphere

All said and done I got the axle OLD down to 134.8 by replacing the single 4mm cassette spacer with 2x cassette spacers at a total 3.5mm, then by replacing the stock 10.5mm shoulder-nut on the cassette side with a 5.7mm thick jam nut then 1.6mm total shims (to bring the surface *just* outside of the...

That sounds good. The noise is actually slightly louder when mounted because somehow it gets amplified by the swingarm. :lol: It's not actually any worse though. It's noticeable both forward and backward, but slightly more forward. At any rate, if yours is similar and you've had no problems, I'm not...

Been riding a MAC 12T for about 6 months now. That whirring noise is the motor spinning. The only time you might hear that once assembled is when pulling your bike backwards with no background noise. It's completely normal and nothing to worry about. So yours makes the exact same noise? How well do...

Back to the dropout spacing (not to ignore the other). Here goes... I got my hardware today. By replacing the 10.5mm thick shoulder-nut thing (which you can see in the video above poking out of the center of the cassette) with a regular thin nut that ended up being 5.7mm thick then adding both a 1mm...

Well that wasn't as hard as expected. I've never uploaded a video from my phone before. Cool. Maybe plenty of vids coming when I get Project Loose Cannon on the road. 8) There are two irritating high-pitched noises in this video. Ignore one of them... That's my bird. :lol: https://youtu.be/WUXFtQd29mE

I received the motor fully assembled. The only thing that was loose was that shoulder-nut thing that I mentioned, but it has no effect on the squealing. Actually, let me try to upload a video to Youtube. A picture is worth a thousand words, a video is worth a thousand pictures, therefore a video is ...

Thanks! The squeal isn't related to the cassette or the cassette freehub body, it does it independently from that. It squeals both with the motor mounted and without, in both directions. Same with the drag (although I'm obviously speaking of only the freewheeling direction for that one). Just to rei...

Bueller? Bueller?
Anybody?

Would a mod kindly move this to E-Bike Technical?

So after much measuring, pondering, and spec'ing hardware, I ordered from McMaster all the proper dimension SS nuts, washers, and round shims that I should need to allow everything to clear while adding inside washers on both sides and keeping the dropout width to <140mm. I do know that 140mm works ...

Well somehow I looked at the freewheel version on the drawing and skipped over the cassette version. :roll: The freewheel version OLD is 135mm, but the cassette version is indeed 138mm. Still I feel that I need inside-the-dropout washers. The thinnest on McMaster are 2.3mm and if I used those the dr...

-Axle mounting width (OLD) with that spacer tight is still longer than 135mm... I don't have a tool that can measure that directly but I did measure my dropout width at 134.3mm with calipers and the dropouts have to spread at least a few extra mm to fit the motor (guessing 137-139mm)... I just meas...

I just bought from EM3ev a Mac 8T w/cassette kit laced into a 20" wheel for my folding bike. I'd send these questions to them, but it is now the E-bikers (and RC'ers) favorite long-term holiday, Chinese New Year. So... -I temporarily mounted it on the bike and plugged everything up and it all s...

I should have included the earlier pic of the part number in case it may have helped with identification, but it wasn't on my mind since it didn't seem to match with anything else I'd seen. Well here it is anyway...

Thanks for the info, guys. Sounds like I was right in that it should still be perfectly usable despite the damaged axle. Yeah, it was a 26" wheel. I was thinking that it's a "350W" version because of the width. The 500W versions seem to be wider. However, I was only going from pics so...

The grease in the motor with the gears isn't black or burnt like it looks in the pic, it's solid green, not burnt at all. Just a bad pic.

Pics

Edit: pics in next post...

The motor and controller in question came off of a Bullshittii (Busettii) ebike that my neighbor bought new several years back (I wish he had talked to me before he did! I don't even want to mention how much he paid). I believe this motor was rated at 350W but the motor is labeled with a Bullshittii...

Okay, that's certainly better than nothing... I'll check them out. If any of them are bad then I'd prefer to replace all of them anyway (then I can find out which were bad just because I'm curious). Thanks again.

fechter wrote: ↑

Feb 23 2019 5:56pm

Sounds like you blew the MOSFETs. It's a good sign if the LED still blinks.

Thanks for the input. Any way to test them without removing them?

Hi ES, I hope everyone is doing well. It's been a long time but I finally just set up the new JP spot welder I bought last year (health issues always get in the way of fun), and I think I fried something. Could be a couple causes. 12V battery is an Optima Redtop, 720 CCA, 4.5 years old though pulled...

Thanks for the much more sensible post. I'm willing to respond to that one. :) I said 3.5V would be ideal for the specific situation that I explained above, not 3.4V. 3.4 5 - 3.5 is what I said that I've read can be float at almost indefinitely... I just started to explain why again, but I was just ...

LOL! Did you even read my whole post?

I just read this whole thread because these D131 BMS' are my best option in terms of function and size. However, there seems to be a lot of failures with these things. I know some failures are from user error, but it appears go beyond that... What's the deal? Are they as unreliable as they seem? I n...

Pardon my still-mostly-lurker-status self for interrupting this truly epic thread, but I figured I'd jump in for a moment since I have great interest in the subject of debate. Hopefully my in-between position can add a useful point of view. (I'm far from an ignorant joe-public sheep, but I haven't f...