Search found 254 matches

by PaulD
Jun 26 2017 11:13am
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 86
Views: 11615

Re: PaulD's lightweight mid drive development

Since you are designing a Motor Kit , Just Design around the newer make it your self battery pack , ( VRUZEND , Mlt34 ) I want a pack that will fit where a standard size water bottle fits... and I want it lightweight. Since this is a low power system, I can get away with smaller 30 cell battery. I ...
by PaulD
Jun 22 2017 4:21pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 86
Views: 11615

Re: PaulD's lightweight mid drive development

PaulD, What is the Progress level ? What all will you be selling with the kit ? ( Sram Direct Mount Crankset as well ? ) ( Any other sources for a Direct Mount Crankset besides Sram at this time ? ) Many of use 12 s packs, or even 14 s packs, so the controller will be adjusted for Voltage, and Amp ...
by PaulD
Jun 13 2017 5:00pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 86
Views: 11615

Re: PaulD's lightweight mid drive development

Your build here looks really nice and is now proven! Congrats! I'll be following this thread! I agree with you on Torque Sensing with a mtb. Just shifting in general sound goofy with a simple PAS system. I looked at the NCTE BB. One model had "Direction of Rotation" as one of the sensors. I thought...
by PaulD
May 23 2017 6:42pm
Forum: Battery Technology
Topic: "Batlab" ..18650 cell condition tester ?
Replies: 19
Views: 1981

Re: "Batlab" ..18650 cell condition tester ?

Nope, still waiting... as expected from a Kickstarter campaign..
by PaulD
Apr 28 2017 4:10pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 86
Views: 11615

Re: PaulD's lightweight mid drive development

The solution that I have been thinking about for a while now, to cut down a pound or more off the BB/Crankset , and , to have better quality BB Bearings and better quality Cranksets , Is To Design a inner sprocket/feeewheel, that bolts right onto existing , Modern 2 piece Cranksets. ( BB30 / Shiman...
by PaulD
Apr 28 2017 2:04pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 86
Views: 11615

Re: PaulD's lightweight mid drive development

Thanks Ron and Luke! I think its feasible to make a winning bike for next year. Flathill - Theoretical torque at the crank is 60 Nm with the current settings. I haven't confirmed. The limiting factor will be the gear reduction. Gear reduction is a compound planetary 1st stage is helical, second is s...
by PaulD
Apr 27 2017 9:03pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 86
Views: 11615

Re: PaulD's lightweight mid drive development

Well, the race was a blast, and the bike performed great except for a jammed chain which cost me 4 minutes... That's an easy problem to fix. In my rush to complete the bike, I adjusted the chain line without realizing I made the perfect size slot between the chainring and powered secondary sprocket ...
by PaulD
Apr 27 2017 11:25am
Forum: General Discussion
Topic: YOUTUBE RECOMMENDS :
Replies: 972
Views: 75973

Re: YOUTUBE RECOMMENDS :

LockH wrote: Electric mountain bikes are racing ahead
Awesome footage. That's me at 0:42-0:44 :) .... had a great time (except for the part where my chain jammed, and I lost 4 minutes loosening my chainring to unjam it :oops: )
I think I was the only one riding a converted bike.
SOC2017race2small.png
SOC2017race2small.png (188.71 KiB) Viewed 1534 times
by PaulD
Apr 19 2017 7:28pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 86
Views: 11615

Re: PaulD's lightweight mid drive development

Ha! Thanks Luke! There are some super fast guys that do the emtb race. Last year a former world champion won! .. funny you mention riding unpowered. Apparently last year, Adam Craig (super fast pro racer) just taped an extension cord to his bike and finished mid-pack. Lol. Sent from my Pixel using T...
by PaulD
Apr 19 2017 5:41pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 86
Views: 11615

PaulD's lightweight mid drive development

Hey ES, I've been working on this for a while, so I thought I should share a bit. I have been developing a mid-drive system with the intention of converting most road and mountain bikes with minimal weight increase. Specs as they are now: 250-350W, ASI FOC controller, torque sensing BB, 36V, 11ah, a...
by PaulD
Mar 20 2017 9:24am
Forum: Battery Technology
Topic: good quality spot welding electrodes?
Replies: 12
Views: 1034

Re: good quality spot welding electrodes?

redilast wrote: Do you get electrode sticking when welding pure nickel?
I did until I sanded a larger flat spot on the tip. Having the larger surface are seems to prevent sticking, although I haven't really done a controlled experiment.
by PaulD
Mar 19 2017 11:42am
Forum: Battery Technology
Topic: good quality spot welding electrodes?
Replies: 12
Views: 1034

Re: good quality spot welding electrodes?

For electrodes, I get 182 chromium copper rod (1/8" dia) from McMaster-Carr and just cut to length and file/sand the desired shape for the tip.
by PaulD
Mar 19 2017 11:12am
Forum: E-Bike General Discussion
Topic: Taipei Cycle Show 2017
Replies: 9
Views: 1299

Re: Taipei Cycle Show 2017

liveforphysics wrote:I'm sadly not going to make Taipei until the 26th or 27th. Work priorities conflict with making the show, but I will still visit Ben and Shenta.
That's too bad Luke, I fly out on the 26th. Hopefully I'll be able to meet up with Justin and other attendees.
by PaulD
Mar 16 2017 8:45pm
Forum: General Discussion
Topic: 3/16" tab punch
Replies: 7
Views: 763

Re: 3/16" tab punch

I bought one of these. https://www.amazon.com/gp/product/B00OM4GVX0/
Works ok. The $100 one from McMaster that I have at work is better.
by PaulD
Mar 10 2017 1:51pm
Forum: E-Bike General Discussion
Topic: Shimano Steps, need some feedback please
Replies: 10
Views: 2947

Re: Shimano Steps, need some feedback please

emco5 wrote: PaulD, what is your Steps minimum happy speed when climbing. I assume it doesn’t like low rpm loads any more than a hub motor does.
Depends on how hard I want to pedal :-) With a mid-drive, you just shift down and go slower to prevent low RPM generating a lot of heat and wasting energy.
by PaulD
Mar 09 2017 9:29pm
Forum: E-Bike General Discussion
Topic: Shimano Steps, need some feedback please
Replies: 10
Views: 2947

Re: Shimano Steps, need some feedback please

Contrary to bike shop endearments, from a guy who rode a Trek Lift I’ve been told that the Shimano Steps system isn’t very strong on hills. Granted, it’s only 250w, but with its internal gearing and electronics feeding a 32t rear cog it should have some muscle. Where does it stand, is it comparable...
by PaulD
Feb 20 2017 3:24pm
Forum: Motor Technology
Topic: Q85 / Q100 dissasembly
Replies: 1
Views: 263

Re: Q85 / Q100 dissasembly

The side w the three screws is a separate piece from the rest of the hub shell. It is threaded into the shell, so you need to twist it via the 3 holes and hold the shell securely. I use a big vice with soft jaws, and put some M4 socket head cap screws into the holes and use a lever between the screw...
by PaulD
Feb 08 2017 10:28pm
Forum: E-Bike Non-hub Motor Drives
Topic: Dave's 80:1 RC mid drive kit build log
Replies: 1409
Views: 186230

Re: Dave's 80:1 RC mid drive kit build log

I've been riding on the square taper THUN, it works great. NTCE is willing to produce the ISIS version in the correct spindle length to fit the kit (we need 30mm of spindle stickout on the chain side, plus 6mm to accommodate the mounting brackets, their existing dimensions aren't compatible with th...
by PaulD
Jan 30 2017 10:47am
Forum: E-Bike General Discussion
Topic: Winter quad tilter build started
Replies: 22
Views: 2222

Re: Winter quad tilter build started

Subscribed!
Can't wait to see more. Any chance of getting some pics of the metal printer in action?
by PaulD
Jan 11 2017 12:06am
Forum: Resources & EV Related Parts and Services
Topic: Open Source 18650 Lithium Battery Characterization System
Replies: 6
Views: 1583

Re: Open Source 18650 Lithium Battery Characterization Syste

Right now your description on the product doesn't seem to indicate clearly the maximum charge and discharge rates of the device. Can it do 2C (ie 5-6A) discharge currents and 1C (2-3A) charge currents on each channel? Hey Justin, Luke and I asked some of these questions on the kickstarter comments ...
by PaulD
Jan 05 2017 7:36pm
Forum: Battery Technology
Topic: DIY Arduino timed spot-welder, FET-switched, adj. pulse
Replies: 51
Views: 11042

Re: DIY Arduino timed spot-welder, FET-switched, adj. pulse

Finished building mine up a few weeks ago, only tried it with 0.15mm Nickel. Works great! My mechanical design needs some work.. mostly 3D printed, got a few brass parts machined by a friend. Right now there is too much slop in the mechanism that (tries to) keep the electrodes aligned, yet allow the...
by PaulD
Jan 01 2017 1:04pm
Forum: Motor Technology
Topic: Open Source DIY non-hub motors
Replies: 55
Views: 8578

Re: Open Source DIY non-hub motors

Thanks Miles. When you say "sufficient material in the yoke to make interconnection", does that mean that a larger yoke cross sectional area is needed for a segmented stator than a one-piece stator? Ron, too bad that i8 video doesn't show they get those wound coils into the slots. That seems like th...
by PaulD
Dec 31 2016 12:43pm
Forum: Motor Technology
Topic: Open Source DIY non-hub motors
Replies: 55
Views: 8578

Re: Open Source DIY non-hub motors

Cool video. I like the idea of the separately wound segments. Interesting that the stator tooth tips are non-existent to allow this type of assembly. Perhaps the motor design experts can chime in on that... Looks like the coils are only retained at the end turns (but all that glue holds it together,...
by PaulD
Dec 12 2016 12:44pm
Forum: Battery Technology
Topic: "Batlab" ..18650 cell condition tester ?
Replies: 19
Views: 1981

Re: "Batlab" ..18650 cell condition tester ?

I ordered one too. Looks like exactly what I need. I'll be interested in how they calculate state of health.
by PaulD
Dec 05 2016 6:57pm
Forum: E-Bike Technical
Topic: LiPo fireproof wrap?
Replies: 8
Views: 826

Re: LiPo fireproof wrap?

liveforphysics wrote:Most Silica based stuff when in contact with arc flashing becomes a highly conductive plasma that enables more current to feed the plasma in a positive feedback loop.

Nomex is the stuff to use.
Agreed on Nomex. Interesting about silica.. why are fuse elements surrounded with silica sand?