Search found 208 matches

by PaulD
Jan 01 2017 1:04pm
Forum: Motor Technology
Topic: Open Source DIY non-hub motors
Replies: 55
Views: 7749

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: 7749

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: 1710

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: 702

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?
by PaulD
Oct 17 2016 1:44pm
Forum: Battery Technology
Topic: 18650 spot welding -how to- ULTIMATE REPOSITORY
Replies: 723
Views: 136121

Re: 18650 spot welding -how to- ULTIMATE REPOSITORY

The subject of copper has come up dozens of times and the discussion always comes back to pure nickel. While ES has been the source of many great discoveries I think this has horse has been beaten to a pulp. Nickel just works. Has anyone considered brass? :twisted: Roughly the same conductivity as ...
by PaulD
Aug 12 2016 11:45am
Forum: General Discussion
Topic: World Domination, I just got my self a 3d Printer!!!
Replies: 636
Views: 60038

Re: World Domination, I just got my self a 3d Printer!!!

Excited for you Paul. Just got a printer myself, and it's captivating to watch parts grow. :-) What printer did you get? Eventually I want to build a ginourmous 36" x 36" printer to do an entire front triangle mold for a carbon frame... When I have time which will probably be never.. Sent from my N...
by PaulD
Aug 12 2016 8:41am
Forum: E-Bike Technical
Topic: What is the function of the little machine screw?
Replies: 6
Views: 365

Re: What is the function of the little machine screw?

To adjust return spring tension so that you can get left and right sides even. That way one side isn't rubbing.

Sent from my Nexus 5X using Tapatalk
by PaulD
Aug 11 2016 9:21pm
Forum: General Discussion
Topic: World Domination, I just got my self a 3d Printer!!!
Replies: 636
Views: 60038

Re: World Domination, I just got my self a 3d Printer!!!

I got a extrusion frame Prusa i3 copy from 3Dprintersonlinestore.com and its amazingly good. A few quirks, but that's to be expected. This is about my 10th print, and I still can't control my evil maniacal world domination laughter while its running :twisted: Below I'm printing with PETG which is fa...
by PaulD
Jul 14 2016 7:57pm
Forum: Battery Technology
Topic: Why Is Lead Solder Welding Not Popular?
Replies: 19
Views: 1881

Re: Why Is Lead Solder Welding Not Popular?

Has anyone considered resistance soldering using pre-tinned busbar or maybe thin ribbon solder between the cell and busbar? Maybe this would allow us to use the $100 alibaba spot welders with 0.2mm brass or copper... This should reduce heat duration significantly compared to a solding iron.... I thi...
by PaulD
Jul 11 2016 12:53pm
Forum: E-Bike General Discussion
Topic: Which kit for mtb greybeards wanting to keep their fitness ?
Replies: 36
Views: 2058

Re: Which kit for mtb greybeards wanting to keep their fitne

2old wrote:3) Can't wait until someone produces a lightweight BBS01-type motor that adds 5-7 pounds, not 10-12 to the bike. Then, only 8-10 pounds extra with a 52V (14s, 2p) battery.
I'm working on it!
MDteaser27APR2016.jpg
MDteaser27APR2016.jpg (234.54 KiB) Viewed 1009 times
by PaulD
Jun 13 2016 3:37pm
Forum: E-Bike General Discussion
Topic: ANT+ Powermeter for PAS
Replies: 3
Views: 383

Re: ANT+ Powermeter for PAS

I've thought about this, and I think it's a good idea. I think the reporting frequency is around 1 Hz for a 4iiii, but not sure about the others. Probably not as responsive as a BB torque sensor, but worth a shot. They are super expensive, and only available on certain crank models, otherwise, I pro...
by PaulD
May 17 2016 5:52pm
Forum: E-Vehicles General Discussion
Topic: Luke (liveforphysics) article on Gizmag
Replies: 42
Views: 4366

Re: Luke (liveforphysics) article on Gizmag

Nice Job Luke! The contract work sounds like a perfect fit for your talents!
by PaulD
May 02 2016 7:55pm
Forum: E-Bike General Discussion
Topic: Reliability of Impulse Motor
Replies: 22
Views: 3868

Re: Reliability of Impulse Motor

Thanks for the pics. Here are my ballpark calcs: They are claiming 80Nm of torque, and thats about a 6:1 secondary reduction. So, thats about 1000N of force assuming that steel gear is about 80mm pitch diameter. Since the motor, secondary axle and BB axle are all in a straight line, the radial force...
by PaulD
May 02 2016 2:35pm
Forum: E-Bike General Discussion
Topic: Reliability of Impulse Motor
Replies: 22
Views: 3868

Re: Reliability of Impulse Motor

Thanks for posting. Good info on the reliability of the Panasonic drive. That bearing does look a little undersize, can you read the size on it and the Panasonic bearing? If you have pictures of the inside of the impluse motor/gear reduction, that would be helpful... should be able to ballpark the b...
by PaulD
Mar 13 2016 5:14pm
Forum: E-Bike General Discussion
Topic: Strava anyone?
Replies: 8
Views: 359

Re: Strava anyone?

Strava is a super fun tool for tracking rides (ebike and human power only).. it would be cool if you could plot out human and electric power through the ride and use some of the Strava built in comparison tools. Mr. Bill is the only other member I know uses Strava. I just joined Kinninviekid's club.
by PaulD
Feb 18 2016 7:55pm
Forum: E-vents
Topic: Mega-Monster Enduro, February 6, 2016, Paicines, California
Replies: 7
Views: 1518

Re: Mega-Monster Enduro, February 6, 2016, Paicines, Califor

Hi Folks: I was disappointed not to see any other e-bikers at this event last weekend on a day when we enjoyed the best weather we've had in several years, warm and sunny with high temperature around 21C. Here's my blog entry and photos from the event: http://mrbill.homeip.net/bikeBlog.php?2016#lkM...
by PaulD
Nov 22 2015 7:34pm
Forum: E-Bike General Discussion
Topic: Sea Otter Classic Offroad E-bike Race
Replies: 14
Views: 1248

Re: Sea Otter Classic Offroad E-bike Race

I'm not sure what the intent is... but I doubt its to spur light electric motorcycle development. But it doesn't sound like its frozen, just power limited, which can spur its own kind of development i.e high efficiency motors, high density lightweight powerpacks, and effective regen, just like it h...
by PaulD
Sep 11 2015 12:07pm
Forum: E-vents
Topic: Interbike 2015, Las Vegas, Sept 14-18
Replies: 140
Views: 17644

Re: Interbike 2015, Las Vegas, Sept 14-18

I will be there Friday only.
by PaulD
Apr 10 2015 12:23am
Forum: General Discussion
Topic: Luke is the Man, Inside batteries from Motorcycle.com
Replies: 40
Views: 5774

Re: Luke is the Man, Inside batteries from Motorcycle.com

Awesome Luke! Great job on the interview!
by PaulD
Apr 03 2015 3:54pm
Forum: Items for Sale - New
Topic: NEW Ultra HD Freewheel Testers Needed
Replies: 46
Views: 7587

Re: NEW Ultra HD Freewheel Testers Needed

kfong wrote: Side by side photos shows the new freewheel to be much taller.
What is the height of the new one? Right now clearance between my freewheel and BB cup is quite close, so it might not fit a lot of bikes.
by PaulD
Mar 27 2015 12:17am
Forum: Items for Sale - Used
Topic: FS: Tesla Model S 18650 cells! Welded Packs! Panasonic; NCA
Replies: 556
Views: 84681

Re: FS: Tesla Model S 18650 cells! Welded Packs! Panasonic;

Got my 40 bare cells on Monday. They all are within a millivolt of 3.315V and 27mOhm +/1.5 AC 1kHz. I'll charge them up to 50% and re-check impedance, I'm sure it will be much lower.
by PaulD
Nov 04 2014 11:12am
Forum: E-Bike Non-hub Motor Drives
Topic: LightningRods mid drive kit
Replies: 4955
Views: 526725

Re: LightningRods mid drive kit

All, a few have PM'd me about CAD files for the alternate mounting plates. I attached STEP files. Let me know if this works.
by PaulD
Nov 03 2014 3:52pm
Forum: E-Bike Non-hub Motor Drives
Topic: LightningRods mid drive kit
Replies: 4955
Views: 526725

Re: LightningRods mid drive kit

What I was saying about your swing adjuster for the secondary chain is that it will lift the upper hanger off of the frame. You need to have an upper hanger adjustable for length. True, you would have to adjust the rotation at the BB, which would have to be tightened after adjusting chain tension w...
by PaulD
Nov 03 2014 2:19pm
Forum: E-Bike Non-hub Motor Drives
Topic: LightningRods mid drive kit
Replies: 4955
Views: 526725

Re: LightningRods mid drive kit

Thanks Sam.
Those are weld nuts like this: http://www.mcmaster.com/#90563a620/=ufqn2f
When screws are installed, they push against the yellow plate to tension the primary belt.
by PaulD
Nov 03 2014 1:57pm
Forum: E-Bike Non-hub Motor Drives
Topic: LightningRods mid drive kit
Replies: 4955
Views: 526725

Re: LightningRods mid drive kit

Cool. The Atoms and all the fancy manufacturing equipment that went along with them were before my time. I think an electric Atom would be a blast.