Search found 254 matches

by PaulD
Oct 17 2019 12:16pm
Forum: E-Bike General Discussion
Topic: Thoughts on cargo bikes
Replies: 8
Views: 141

Re: Thoughts on cargo bikes

Wish they'd make an open (non-Bosch) version. Big hills + heavy loads need lots more oomph The Sweet Curry makes for a great conversion. Lot's of room for battery. I can cruise at 22-25 mph with 450W, but less when fully loaded up. A bigger mid-drive should do it. The small rear wheel leads me to u...
by PaulD
Oct 15 2019 12:08pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 882
Views: 101231

Re: New welding metal

It's nickel, stainless steel and copper. I asked if he could send me a sample of it so he sent me 12" of it. He has no supply yet so this with a lot of his very limited stock. As expected the .3mm nickel has the lowest resistance. But check out that .1mm thick alloy! Not much more resistance despit...
by PaulD
Oct 14 2019 1:52pm
Forum: E-Bike Technical
Topic: Programming ASI Bac 8000
Replies: 4
Views: 169

Re: Programming ASI Bac 8000

john61ct wrote:
Oct 14 2019 8:08am
I also would like to find a freelance professional willing to tune these controllers to a given motor.
I've been considering this for a while. I've spent a lot of time tuning for a few different motors. Feel free to shoot me a PM.
by PaulD
Oct 06 2019 3:07pm
Forum: E-Bike Non-hub Motor Drives
Topic: Dave's 80:1 RC mid drive kit build log
Replies: 1409
Views: 186205

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

Ecyclist wrote:
Oct 06 2019 10:37am
I built a drive for myself. In two days I will by flying with my set-up to Japan.
How are you going to get that bike on the airplane?
by PaulD
Oct 05 2019 12:41pm
Forum: E-Bike Technical
Topic: ASI Bac2000 tuning
Replies: 1
Views: 109

Re: ASI Bac2000 tunning

If you share your XML parameter file, some people might be able to have a look at it and help you.
by PaulD
Oct 03 2019 6:04pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 86
Views: 11611

Re: PaulD's lightweight mid drive development

The problem with adjusting the gearing by 1.4X is that the top speed of the motor would be too high. Do you mean with respect to heating and wearing down of internal pieces? Makes sense. 40% is significant. So there is no safe workaround to internal rewiring. Efficiency, heating and wear, and risk ...
by PaulD
Oct 02 2019 11:25pm
Forum: E-Bike Technical
Topic: Sprag clutch vs freewheel
Replies: 12
Views: 491

Re: Sprag clutch vs freewheel

Ok, I finally had time to get some pictures of my sprag experiment. I think the outer ring might not be stiff enough, but testing will prove that out. One might think it's an advantage to have a larger diameter, but it requires more material to achieve sufficient stiffness. This is about 200g heavie...
by PaulD
Oct 01 2019 1:58pm
Forum: E-Bike Non-hub Motor Drives
Topic: Dengfu M09 Endruo/Freeride build log
Replies: 102
Views: 4801

Re: Dengfu M09 Endruo/Freeride build log

Instead it has a single magnet on the end of the motor pinion gear which is located behind the shinny circular post just behind the 3 phase plug. This means you will need to take care refitting the speed controller cover as I presume there is a sensor on the speed controller circuit board that pick...
by PaulD
Sep 25 2019 3:39pm
Forum: E-Bike Non-hub Motor Drives
Topic: Luna Cycle X-1 Enduro FS (Bafang M600 / Dengfu M09)
Replies: 124
Views: 4208

Re: Luna Cycle X-1 Enduro FS (Bafang M600 / Dengfu M09)

I emailed Luna about the weight on the product page. They said when they weighed their bike in the shop it was 49lbs. I asked if they could put it on the scale again to verify. They responded back the medium is 55lbs and there's no way to make it lighter, lol. My gut tells me the shop was too busy ...
by PaulD
Sep 23 2019 8:45am
Forum: Battery Technology
Topic: Is my Valence LiFePO4 DOA?
Replies: 7
Views: 235

Re: Is my Valence LiFePO4 DOA?

There was no status light then or now. In my experience, no status light means either a cell or two below minimum voltage or a bad BMS board. Did you measure a voltage on the terminals? Return shipping will be an issue since a battery that size needs to ship fully regulated dangerous goods. They sh...
by PaulD
Sep 13 2019 10:21pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 86
Views: 11611

Re: PaulD's lightweight mid drive development

I understand 52V would work with your motor, by reprogramming the controller, but with sub-optimal efficiency. Am I correct to assume that the motor would then spin 14/10 times faster unloaded? What kind of efficiency loss are we talking about, at constant speed and load? (assuming it is easy to ad...
by PaulD
Sep 10 2019 12:52pm
Forum: E-Bike Non-hub Motor Drives
Topic: GNG / CYC X1 Pro 3000w
Replies: 436
Views: 46147

Re: GNG / CYC X1 Pro 3000w

CYC has informed me that the black 72v torque sense version will be shipped soon, the version I'm getting. I can't wait to post progress pics of my build for you guys, I have a cycle analyst 3 installed so I'll be tuning optimal settings for that to make up for the weaknesses in the beta app. Here ...
by PaulD
Sep 02 2019 10:58pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 86
Views: 11611

Re: PaulD's lightweight mid drive development

I chose the middle ground for optimum cadence. Early prototypes favored lower pedal speeds, but some beta testers wanted more power at 70-80 RPM, so I decreased the final gear ratio a bit. Savvy users can adjust the gear ratio by changing out the sprockets. The #25 front final drive sprocket is a st...
by PaulD
Sep 02 2019 5:30pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 86
Views: 11611

Re: PaulD's lightweight mid drive development

Mainly wondering how it would compare to thesee "250w" factory bikes that peak above 1kw and put out +100nm. Sounds like it won't have the same kind of power. Which mid-drives are you referring to? Bosch and Shimano are around 70Nm. https://www.bosch-ebike.com/us/products/drive-units/ I'm not tryin...
by PaulD
Sep 02 2019 3:10pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 86
Views: 11611

Re: PaulD's lightweight mid drive development

Going to have a crank option for us heavy aggressive types? PF30 capable? 450w peak or sustained? Any clips showing noise? I am working on system that mounts like a direct mount chainring, allowing other cranks/BB, but it's early in development. You can use a PF30 to threaded adapter to fit the kit...
by PaulD
Sep 02 2019 1:05pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 86
Views: 11611

Re: PaulD's lightweight mid drive development

neptronix wrote:
Aug 27 2019 7:07pm
If you still need another tester, i have a pair of recumbents here, as well as some long 1-30% grades to scale.
I'll send you a PM, Neptronix.
by PaulD
Aug 14 2019 11:28am
Forum: E-Bike Non-hub Motor Drives
Topic: Dave's 80:1 RC mid drive kit build log
Replies: 1409
Views: 186205

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

Understood. I doubt the freewheel adapter holds much IP value, but maybe it's part the axle?

And, Slowco, generally I find machine shops treat you much better in terms of service and price if you have your ducks in a row - i.e. - have a drawing and CAD file and don't need hand-holding.
by PaulD
Aug 13 2019 1:14pm
Forum: E-Bike Non-hub Motor Drives
Topic: Dave's 80:1 RC mid drive kit build log
Replies: 1409
Views: 186205

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

Maybe if you guys ask Dave, he will send a CAD file and drawing for the part so you can get a quote from a machine shop for a run of 5 or 10 (not sure how many drives have been sold) replacements parts. Unit cost for a handful will be a fraction of the cost for one. Seems like the right thing to do ...
by PaulD
Aug 07 2019 12:56pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 86
Views: 11611

Re: PaulD's lightweight mid drive development

Searching images on the web turned up an ISIS version of the Sempu, does not seem to be available for purchase yet. As far as I can tell, Sempu stopped making these. They were only available in 68x128mm. I have a few left over in stock that I don't need, as I have moved onto the T4, since it measur...
by PaulD
Aug 07 2019 12:43pm
Forum: E-Bike Non-hub Motor Drives
Topic: My RC Mid Drive with Single Stage Reduction
Replies: 301
Views: 22986

Re: My RC Mid Drive with Single Stage Reduction

Just received the Rebel 90T sprocket. Somehow it ended up being only 3.5 mm thick. I did not ask for that, but it looks good. Hope it will be strong enough. 3.5mm is plenty for reasonable crank torque. I (and 5 beta testers) used a 2.3mm, 6061-T6 sprocket at 500W for a few thousand miles each. It h...
by PaulD
Aug 05 2019 10:25pm
Forum: E-Bike Technical
Topic: A low-cost e-MTB Production log
Replies: 51
Views: 1756

Re: A low-cost e-MTB Production log

Impressive! Really nice, clean design.
Do you seriously think you can offer it for under $1000? Those Maxxis tires alone are about $50 each, dealer cost. I realize those probably aren't the production parts, but that price sounds insane. A 48V20ah pack must be at least $200 cost in high volume.
by PaulD
Aug 05 2019 5:06pm
Forum: E-Bike General Discussion
Topic: Hub motor industry dying?
Replies: 250
Views: 7676

Re: Hub motor industry dying?

I believe that these hubs could use a combination of using thinner lams + change the casing for better heat dispersion, and in that case, they'd make killer mid drive and also rear wheel motors.. Couldn't have said it better :twisted: Thin lams, custom winding and direct thermal path from stator to...
by PaulD
Aug 05 2019 3:15pm
Forum: E-Bike General Discussion
Topic: Hub motor industry dying?
Replies: 250
Views: 7676

Re: Hub motor industry dying?

The first dual reduction geared motors have been a huge disappointment but i believe there is room to improve them. Are you referring to the "first gen" geared hub motors like Cute or Mac? or the newer Bafang GXXX hubs? I haven't heard much long term test info on the Bafangs. Is it the durability o...
by PaulD
Aug 05 2019 12:49pm
Forum: E-Bike General Discussion
Topic: Hub motor industry dying?
Replies: 250
Views: 7676

Re: Hub motor industry dying?

The Aden is interesting simply because of how easily it can be added to an existing bike. In a way it's similar to a friction drive with a large helical gear instead of the tire. Throwing 4# onto the swingarm is still a bit questionable from a handling perspective but not an appalling idea. 1300w i...
by PaulD
Jul 31 2019 4:27pm
Forum: E-Bike Non-hub Motor Drives
Topic: PaulD's lightweight mid drive development
Replies: 86
Views: 11611

Re: PaulD's lightweight mid drive development

agniusm wrote:
Jul 30 2019 12:01am
Very, very, very very nice.
Thanks Agniusm,
Here's a pic of the custom wire EDM ratchet ring. I'm using White Industries pawls and springs.
Edit: I forgot to mention that there are 2 offset sets of pawls, so with the 40 tooth ratchet, we get 80 points of engagement.