Search found 514 matches

by Overclocker
Feb 06 2019 9:01am
Forum: E-Bike Non-hub Motor Drives
Topic: New build, BHT mid-drive "direct", custom frame
Replies: 100
Views: 14351

Re: New build, BHT mid-drive "direct", custom frame



but i neglected to discuss how to release the pressure. you could just pierce the rubber plug w/ a hypodermic needle (which is how they charge it in the factory)
by Overclocker
Feb 06 2019 3:33am
Forum: E-Bike Non-hub Motor Drives
Topic: New build, BHT mid-drive "direct", custom frame
Replies: 100
Views: 14351

Re: New build, BHT mid-drive "direct", custom frame

Sean9002, i think it lost pressure, which kept the rebound needle from backing off the orifice, thus the super slow rebound. full diagnosis soon trazor, sure. actually i haven't filled it w/ oil yet, that's the messy part. will make a video soon. btw what's your complete frame weight without shock a...
by Overclocker
Feb 05 2019 10:54am
Forum: E-Bike Non-hub Motor Drives
Topic: New build, BHT mid-drive "direct", custom frame
Replies: 100
Views: 14351

Re: New build, BHT mid-drive "direct", custom frame

i picked 1.8mm wall thickness because thinner is very difficult to weld w/ my 0.9mm fluxcore wire, at least w/ the machine i have. anyway i just picked up a co2 tank. let's see if i could weld 1.3mm wall w/ MIG. i could probably get away w/ using thinner wall for the saddle bracket https://i.imgur.c...
by Overclocker
Feb 05 2019 3:49am
Forum: E-Bike Non-hub Motor Drives
Topic: New build, BHT mid-drive "direct", custom frame
Replies: 100
Views: 14351

Re: New build, BHT mid-drive "direct", custom frame

Chambers wrote:
Feb 05 2019 3:15am
Should be plenty strong mate - I was just curious :thumb:
you really think so? because i really don't have an idea :lol:
by Overclocker
Feb 03 2019 5:47am
Forum: E-Bike Non-hub Motor Drives
Topic: New build, BHT mid-drive "direct", custom frame
Replies: 100
Views: 14351

Re: New build, BHT mid-drive "direct", custom frame

Awesome build! Apologies if I missed it, Is the whole frame water pipe? Or just the head-tube? If not what tubing have you used? Thanks head tube is galvanized water pipe :lol: but dipped in hydrochloric acid to remove the zinc (not good to weld zinc) the smaller tubes are 1/2" nominal ERW. actual ...
by Overclocker
Jan 28 2019 11:35am
Forum: E-Bike Non-hub Motor Drives
Topic: New build, BHT mid-drive "direct", custom frame
Replies: 100
Views: 14351

Re: New build, BHT mid-drive "direct", custom frame

nice work :thumb: As a small hint in terms of form stability of the frame, i would weld something like the "X" as done on LMX frames near the head tube to make it stiffer. And i also would weld another tube between motor and battery to have upper and lower tubes connected. https://i.imgur.com/m2Af0...
by Overclocker
Jan 18 2019 10:15am
Forum: E-Bike Non-hub Motor Drives
Topic: New build, BHT mid-drive "direct", custom frame
Replies: 100
Views: 14351

Re: New build, BHT mid-drive "direct", custom frame

this is actually my first time to notch so i'm surprised that it worked as well as it did :lol: maybe you just have to compensate for the thickness of the pipe. the template generated is really for a theoretical zero-thickness pipe. https://i.imgur.com/IVHKf7j.jpg "footpegs". cheap VP Components ped...
by Overclocker
Jan 18 2019 9:58am
Forum: General Discussion
Topic: MIG Welding questions
Replies: 19
Views: 1368

Re: MIG Welding questions

Image

i'm now getting half-decent results w/ flux-core wire but i wanna try MIG. is it that much better?

specifically i'm getting tired of the cleanup needed w/ flux-core. and the smoke :flame:
by Overclocker
Jan 16 2019 9:54am
Forum: E-Bike Non-hub Motor Drives
Topic: Mid Drive Steel Frame Bike
Replies: 26
Views: 2302

Re: Mid Drive Steel Frame Bike

very nice fab skills! is that MIG welding?

btw i'm just a bit concerned about the strength of the swingarm since you cut holes in it (red arrow). this weakens the rectangular tube. maybe you could weld a circular "cap" over the hole to strengthen it

Image
by Overclocker
Jan 16 2019 9:36am
Forum: E-Bike Non-hub Motor Drives
Topic: New build, BHT mid-drive "direct", custom frame
Replies: 100
Views: 14351

Re: New build, BHT mid-drive "direct", custom frame

Great progress! I'm curious about which method you use to bend tubes. And the tube notching is perfect how you did it? there's a machine shop very close to my house about 1 block away. i just print an actual size template of the bends and he does them on the steel pipe using a manual pipe bender w/...
by Overclocker
Jan 13 2019 9:46am
Forum: E-Bike Non-hub Motor Drives
Topic: BBSHD Build with GX Eagle 1x12?
Replies: 18
Views: 460

Re: BBSHD Build with GX Eagle 1x12?

mid-drives EAT drivetrains. over thousands of kilometers riding different mid-drives i've ruined many cassettes, chains, derailleurs, derailleur hangers, etc. so now i use only the cheapest 8spd components
by Overclocker
Jan 11 2019 9:32am
Forum: Battery Technology
Topic: Balancing a 20s battery back
Replies: 16
Views: 421

Re: Balancing a 20s battery back

3p shouldn't take long to balance. and if you built it well and if the cells are all from the same batch you don't even have to balance for like a year
by Overclocker
Jan 11 2019 6:03am
Forum: Battery Technology
Topic: High current weld strips
Replies: 9
Views: 305

Re: High current weld strips

.15mm nickel tabs spot welded to the A123. then 10ga stranded copper wire soldered on top. i guess the little spot welds create a bottleneck. but right now i can't think of a better way, without soldering directly onto the A123 That looks like what I was thinking originally. Obviously you were able...
by Overclocker
Jan 10 2019 9:14am
Forum: E-Bike Build Threads / Photos & Video
Topic: Big 100 Volt 54 ah Battery build
Replies: 14
Views: 657

Re: Big 100 Volt 54 ah Battery build

check out my method. pre-fluxed btw:

Image



Image




i guess soldering is ok if done fast. but i don't do it anymore because spot welding is easier.
by Overclocker
Jan 09 2019 9:11am
Forum: Battery Technology
Topic: High current weld strips
Replies: 9
Views: 305

Re: High current weld strips

https://i.imgur.com/TyPSaZn.jpg 4s2p anr26650m1a. sufficient to jump my cars a honda fit and a ford ecosport, both 1.5L engines .15mm nickel tabs spot welded to the A123. then 10ga stranded copper wire soldered on top. i guess the little spot welds create a bottleneck. but right now i can't think o...
by Overclocker
Jan 07 2019 7:10am
Forum: E-Bike General Discussion
Topic: Marzocchi fork help
Replies: 10
Views: 222

Re: Marzocchi fork help

you don't really need to have the QR-type 20mm axle. the pinch bolts you have now were orginally small QR levers if i'm not mistaken. so you simply need a plain 20mm axle of the correct length (it'll still have a bolt at the end to press everything together). then the pinch bolts will clamp onto the...
by Overclocker
Jan 05 2019 11:41pm
Forum: Battery Technology
Topic: Will the battery pack okay if the cells are not glued together?
Replies: 2
Views: 176

Re: Will the battery pack okay if the cells are not glued together?

if not glued it's possible for cells to chafe through (due to vibration) the very thin PVC sleeves and short.

for added protection i like putting a layer of kapton tape between opposing parallel groups, then bonding w/ silicone sealant
by Overclocker
Jan 05 2019 1:22am
Forum: E-Bike General Discussion
Topic: 428 chain sprockets and freewheel for ebike setup
Replies: 3
Views: 410

Re: 428 chain sprockets and freewheel for ebike setup

what kind of power are you running? 428 is rather heavy...

e.g. the sur-ron uses 420
by Overclocker
Jan 05 2019 1:10am
Forum: Battery Technology
Topic: Paralell 13s5p 18650s with rc lipos?
Replies: 11
Views: 300

Re: Paralell 13s5p 18650s with rc lipos?

i've done experiments here: https://endless-sphere.com/forums/viewtopic.php?t=83141 the GA's need to be discharged to 2.5v to get the most out of them. can your lipos go this low? if not then this isn't a good plan then what'll happen is the lipos will contribute more in the beginning. but as the li...
by Overclocker
Jan 05 2019 12:53am
Forum: Battery Technology
Topic: Samsung 35E vs 30Q Cycle Life
Replies: 26
Views: 1275

Re: Samsung 35E vs 30Q Cycle Life

30qm. "m" means malaysia
by Overclocker
Jan 04 2019 8:46pm
Forum: Battery Technology
Topic: A sure way to check for fake cells
Replies: 8
Views: 1141

Re: A sure way to check for fake cells

Image

should have a stamped code there. you need to peel off a bit to see it
by Overclocker
Jan 04 2019 8:44pm
Forum: Items for Sale - New
Topic: em3ev firesaling their old BBS01 and BBS02 stock - $275
Replies: 4
Views: 476

Re: em3ev firesaling their old BBS01 and BBS02 stock - $275

"pre 2016". hmmm... those had controller issues, right?