Search found 2814 matches

by speedmd
Jan 10 2021 8:53pm
Forum: General Discussion
Topic: Looking for this tool to remove my front chainring on a bewo middrive
Replies: 10
Views: 445

Re: Looking for this tool to remove my front chainring on a bewo middrive

I would Give your mini torch a go. I use a plumbers torch most times. Just hot to the touch. Some times just a bit of heat on a alloy part will free it. It will grow three times what the steel will and also heats much faster. On thread direction, the cutouts will allow you to see at least the first ...
by speedmd
Jan 10 2021 10:52am
Forum: General Discussion
Topic: Looking for this tool to remove my front chainring on a bewo middrive
Replies: 10
Views: 445

Re: Looking for this tool to remove my front chainring on a bewo middrive

There is enough thread visible in the cut outs to verify the thread direction. From here it appears to be left hand. Make sure before beating on it. Use a heavier hammer and a sturdier punch. Warm the alloy spider with a torch or heat gun and quench it with penetrating oil or water and let cool. If ...
by speedmd
Jan 09 2021 1:34pm
Forum: E-Bike Non-hub Motor Drives
Topic: Will TSDZ2 or BBS02 fit on this bike?
Replies: 10
Views: 528

Re: Will TSDZ2 or BBS02 fit on this bike?

Metal bike frames are very easy to reshape - modify (DENT) where and if needed. Just lay a hammer handle at the spot and hit it with a soft blow type hammer. BB shells on them are relatively thin so fitting into motor gap should be of little concern. Would be great is you could get one offset crank ...
by speedmd
Jan 09 2021 9:29am
Forum: E-Bike Non-hub Motor Drives
Topic: Trek Fuel - Small block left drive first build
Replies: 12
Views: 687

Re: Trek Fuel - Small block left drive first build

There are many threads on throttle choices. Do a google search of the site to best find them. If your add a CA (Cycle analyst) you will have some control over throttle ramps which help greatly. I have a sabvoton 72150 on my GNG 450. Much like the small block with surface mount magnets. It has never ...
by speedmd
Jan 04 2021 2:11pm
Forum: E-Bike Non-hub Motor Drives
Topic: Trek Fuel - Small block left drive first build
Replies: 12
Views: 687

Re: Trek Fuel - Small block left drive first build

LMX was running something very much like I am building. Mine will be both a floating type disc and sprocket mounted to a hub suitable to accept 5.25 BC kart sprockets and common Avid disc that has been removed from its hub. Belt does have a bit of latitude on chain line. Agree that the solid mounted...
by speedmd
Jan 04 2021 4:44am
Forum: E-Bike Non-hub Motor Drives
Topic: Trek Fuel - Small block left drive first build
Replies: 12
Views: 687

Re: Trek Fuel - Small block left drive first build

Could the smallest available brake rotor fit inside the mounting plane of the sprocket? You won't need a lot of braking force if you use regen to do most of the work then modulate with friction brakes. I believe you can. You still need to pocket out the center of the sprocket hub to clear the calip...
by speedmd
Jan 03 2021 12:14pm
Forum: Large EV General Discussion
Topic: Polaris Ranger EV
Replies: 38
Views: 32156

Re: Polaris Ranger EV

I would not assume it is just programing. These can charge above 55v with the wet batteries. I have not pulled it apart to check cap values. With regen - slide braking as programed, you want a bit of head room.
by speedmd
Jan 03 2021 11:03am
Forum: Large EV General Discussion
Topic: Polaris Ranger EV
Replies: 38
Views: 32156

Re: Polaris Ranger EV

Not sure if they program a high voltage cut off but would tread softly. I know from experience that you can run it near dead with the wet batteries. Sevcon lists a size 6 in 36 -48 volt and 72 - 80v models. The 36- 48v which is most likely in them has a 69.6v max listed.
by speedmd
Jan 03 2021 7:46am
Forum: E-Bike Non-hub Motor Drives
Topic: Trek Fuel - Small block left drive first build
Replies: 12
Views: 687

Re: Trek Fuel - Small block left drive first build

Here is a LTR build that was on FB. Looks to clear well. https://scontent-lga3-1.xx.fbcdn.net/v/t1.0-9/131924362_5476309789061160_2095480070313512664_o.jpg?_nc_cat=103&ccb=2&_nc_sid=110474&_nc_ohc=ffDp2cBB7C4AX_xAAor&_nc_ht=scontent-lga3-1.xx&oh=f774a51a5fe211e49f557688d3a3551a&a...
by speedmd
Jan 03 2021 5:55am
Forum: E-Bike Non-hub Motor Drives
Topic: Trek Fuel - Small block left drive first build
Replies: 12
Views: 687

Re: Trek Fuel - Small block left drive first build

Wax! ? Certainly not a place for mobile oils. I am designing a dual mount hub now for a 92 tooth 219 sprocket, and 160mm rotor. Need roughly .7 inch spacing to clear most calipers I have checked. Need to make sure spoke and tire clearances are suitable. A few builds have done this so far and in use.
by speedmd
Dec 16 2020 8:40am
Forum: Forum Rules and Features
Topic: How do you feel about 'other toxic discussions' on this forum?
Replies: 39
Views: 1026

Re: How do you feel about 'other toxic discussions' on this forum?

I am not at all interested in OTC and wish I could place all of the threads on a ignore list and not be pulled into it via quick links. I would rather think a member a fool then to read some of the crap they will commit to in writing. I avoided ES for months at a time after reading some of the posts...
by speedmd
Nov 18 2020 10:08am
Forum: E-Bike Non-hub Motor Drives
Topic: Light, high torque, powerful mid drive motor choices
Replies: 42
Views: 6588

Re: Light, high torque, powerful mid drive motor choices

Nice size! 118x51mm 1400 grams and 12KW on 14s. https://ae01.alicdn.com/kf/H3c9c2ab0589e4abf9a14077fc2236f41F/MAIT-TMU15L-M30-100KV-Multirotor-Motor-12-16S-Brushless-Motor-For-Drone-Agricultural-Drones-Thrust-50KG.jpg_q50.jpg rushless-Motor-For-Drone-Agricultural-Drones-Thrust-50KG.jpg_q50.jpg And l...
by speedmd
Sep 02 2020 12:39pm
Forum: E-Bike Non-hub Motor Drives
Topic: Bafang mid drive won't fit, any other options?
Replies: 7
Views: 541

Re: Bafang mid drive won't fit, any other options?

If determined, You could grind away the BB shell to form fit the motor placement. If its a bit too thin- breaks though, you could always lay in a few layers of carbon fabric to stabilize it and make it custom form fit.
by speedmd
Jul 20 2020 7:25am
Forum: E-Bike General Discussion
Topic: Do I need I need to wrap this?
Replies: 8
Views: 352

Re: Do I need I need to wrap this?

My late electrician would save a bunch of wonder bread bags for this type of insulation duty. He would wrap lugs and larger connections as much as needed (voltage, vibration, and impact) to protect sharp edges from cutting through and cover with a layer of ele tape to keep it in place (shrink tube w...
by speedmd
Jul 15 2020 7:52am
Forum: E-Bike Non-hub Motor Drives
Topic: Bafang BBSxx - fault finding and fixes
Replies: 1054
Views: 186060

Re: Bafang BBSxx - fault finding and fixes

Agree Tom. They should have added thermal roll back on this setup. Interesting to see the phase runner and ca setups on the HD. That would be a big improvement to the stock setup. Not sure the BBS02 is worth trying to retro fit with all it's mechanical shortcomings. New style stock controller and at...
by speedmd
Jul 11 2020 6:12pm
Forum: E-Bike Non-hub Motor Drives
Topic: Bafang BBSxx - fault finding and fixes
Replies: 1054
Views: 186060

Re: Bafang BBSxx - fault finding and fixes

It has a 46 tooth chain ring on it and a 32 rear. May need to go up to a 42 or bigger rear to have avoided the controller overheat. My 110 pound grand son was on it pedaling some 50 -55 rpms next to me when it went dead. Just on low pas level settings, maybe 40% power. Center leg again. We were abou...
by speedmd
Jun 28 2020 8:39am
Forum: E-Bike Non-hub Motor Drives
Topic: Bafang BBSxx - fault finding and fixes
Replies: 1054
Views: 186060

Re: Bafang BBSxx - fault finding and fixes

I have a early BBS02 with another blown controller. It lost a leg on a steep climb while on a low (30 -40% current) pas setting but was steep enough to slow the cadence significantly even with significant rider input. Total weight was under 170 pounds but enough. Unfortunately, finding they changed ...
by speedmd
May 19 2020 8:56pm
Forum: Large EV General Discussion
Topic: Polaris Ranger EV
Replies: 38
Views: 32156

Re: Polaris Ranger EV

The chassis wire -switches- lights are 12v, and share many of the Ice components. I most likely will leave a second- 12v battery in it if easier. May make it easier to have a onboard LI battery heater connected for those times it may be needed and no outlet is near by for the overnight ac heater set...
by speedmd
May 12 2020 5:22pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1885
Views: 246344

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

It’s consistent across the entire range I’m aware of. But to your point, now that I looked it up in a table, I find that the difference in gauge for a 2:1 cross-sectional area ratio is in fact 3, not 2. :oops: And the 2:1 ratio is exact, not approximate. Yes the 3x rule works, but that leaves you p...
by speedmd
May 12 2020 8:04am
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1885
Views: 246344

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

the approximate ratio of cross-sectional area is 2:1 Yes, and if your into approximates, that is suitable. Unfortunately that only holds relatively consistently for part of the range. Fine multi Stranding, also makes it difficult to compare physically and the open metal wire gauges difficult to use...
by speedmd
May 11 2020 7:21pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1885
Views: 246344

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

ZeroEm wrote: ↑May 11 2020 10:09am The leafmotor from leafbikes Called "black magic" comes with 3mm phase wires, between 8-9 gauge awg Which gauge converter are you using? The term "Gauge" varies with materials. To my understanding, Tradition is from firearms making balls from a...
by speedmd
May 01 2020 4:27pm
Forum: Large EV General Discussion
Topic: Polaris Ranger EV
Replies: 38
Views: 32156

Re: Polaris Ranger EV

14S, 7 of the leaf modules should be a direct drop in. You may need check the stock controller programing for a suitable low voltage cut off for Li packs. Put a voltage indicator or alarm on the pack so you don't get too low if your exploring. The BMS I am waiting for will take care of that issue. I...
by speedmd
May 01 2020 3:46pm
Forum: E-Bike General Discussion
Topic: Broken Spokes (On Going Problem)
Replies: 63
Views: 2364

Re: Broken Spokes (On Going Problem)

+1 on the stronger / heavier rim. Glad to see your replacing all the spokes. Any of the ones not broken, would most likely have been compromised structurally. The limiting factor to building the most stable wheels is the rim in most cases. It is what limits how tight you can string it also. It is al...
by speedmd
May 01 2020 10:58am
Forum: General Discussion
Topic: Best power to weight hub motor..?
Replies: 25
Views: 1082

Re: Best power to weight hub motor..?

I posted some of the motor choices in another thread. https://endless-sphere.com/forums/viewtopic.php?f=28&t=68950 The 20KW would make a good flying motor IMO. Listed at 5KG It looks to be able to run on reasonable low voltage. http://mymobilemms.com/OFFTHEGRIDWATER.CA/images/238-50b.jpg With a ...
by speedmd
Apr 30 2020 7:39pm
Forum: General Discussion
Topic: Best power to weight hub motor..?
Replies: 25
Views: 1082

Re: Best power to weight hub motor..?

Flying ebike? :shock:
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