Search found 22 matches

by bh4801
Oct 06 2017 2:36pm
Forum: E-Bike Non-hub Motor Drives
Topic: Astral Rune build thread
Replies: 16
Views: 1931

Re: Astral Rune build thread

Nice work! I like how cleverly you attach to existing frame features, the freewheel spinning on crank spindle, the motor mounted to pivots. I am curious as to your motor selection, it would seem the overall ratio is ca. 24, with 27.5 wheels, 145 Kv motor and 45V average battery your top speed should...
by bh4801
Sep 30 2017 5:03am
Forum: E-Bike Non-hub Motor Drives
Topic: Freewheeling Design for the Shimano Hollowtec II Crankset
Replies: 42
Views: 2186

Re: Freewheeling Design for the Shimano Hollowtec II Cranks

I don't think it hurts at all to pamper a sprague clutch with bearing support. They are very reliant on the inner and outer cylinder wall geometry staying very flat and round to function. This has been discussed here: https://endless-sphere.com/forums/viewtopic.php?f=28&t=47618&p=850836&hilit=csk35...
by bh4801
Sep 29 2017 4:05pm
Forum: E-Bike General Discussion
Topic: Only the poor want ebikes
Replies: 93
Views: 5949

Re: Only the poor want ebikes

Chalo wrote: ...not even counting the car's purchase cost, fuel, maintenance, or a place to keep it.
...depreciation, that painfully kicks in as soon as you're out on the market for a new ride....
by bh4801
Sep 29 2017 4:02pm
Forum: E-Bike General Discussion
Topic: Only the poor want ebikes
Replies: 93
Views: 5949

Re: Only the poor want ebikes

Apex wrote:markz, Chalo, amberwolf;..., but most people just can't get past the initial cost.
If you always do the same, you always get the same in return....
Why not skip the cost issue and focus on benefits?
Benefit to your interlocutor 's needs, not yours.
Takes a bit of inquiring, I know.
by bh4801
Sep 29 2017 3:09pm
Forum: E-Bike Non-hub Motor Drives
Topic: Freewheeling Design for the Shimano Hollowtec II Crankset
Replies: 42
Views: 2186

Re: Freewheeling Design for the Shimano Hollowtec II Cranks

...Like I said, that's some really nice work you've done there. I couldn't be happier with your reply, thanks a million! 8) Now, is there anyone out there to take on Chalo's challenge of fitting a CSK40 to the FC-M815? That is to boost rider weight rating to some 150+ kgs or DH Elites stomping on t...
by bh4801
Sep 29 2017 11:42am
Forum: E-Bike Non-hub Motor Drives
Topic: Freewheeling Design for the Shimano Hollowtec II Crankset
Replies: 42
Views: 2186

Re: Freewheeling Design for the Shimano Hollowtec II Cranks

That's cool. Maybe one day you can make a full scale version for adult riders. :wink: Good 'ol cranky cheeky Chalo, thanks for chiming in :lol: One would have though why not use a CSK40 and larger BCD chainrings? I can see there are 38T 130 BCD ones but... the added width of a CSK40 would consume t...
by bh4801
Sep 29 2017 11:38am
Forum: E-Bike Non-hub Motor Drives
Topic: Freewheeling Design for the Shimano Hollowtec II Crankset
Replies: 42
Views: 2186

Re: Freewheeling Design for the Shimano Hollowtec II Cranks

...the slightest play in the keyway and it *will* get all chewed up by the key... Unlike cycloid gearboxes, my drive unit is vibration-free (belt primary and planetary secondary), therefore I believe in my construction the the key is sufficiently immobilised in all three axes: 1. inside the steel c...
by bh4801
Sep 29 2017 6:58am
Forum: E-Bike Non-hub Motor Drives
Topic: Freewheeling Design for the Shimano Hollowtec II Crankset
Replies: 42
Views: 2186

Re: Freewheeling Design for the Shimano Hollowtec II Cranks

Please, don't consider my previous comment in any way a criticism. As you say, only time will tell, and if you've managed 1100km so far on it, it's doing pretty well. Absolutely not :) , we are exchanging ideas with no personal implication I'm interested in your construction, by the way. My underst...
by bh4801
Sep 29 2017 6:17am
Forum: E-Bike Non-hub Motor Drives
Topic: Freewheeling Design for the Shimano Hollowtec II Crankset
Replies: 42
Views: 2186

Re: Freewheeling Design for the Shimano Hollowtec II Cranks

That's top bananas, that is. Very, very, nice work. I assume in this picture, the milled cutout is for the key? If so, I think that's the bit I'd be worried about breaking. Thanks :D So far I made 1100km offroad, a handful of DH runs in a bikepark, jumps, shores, drops, the usual stuff :twisted: Th...
by bh4801
Sep 28 2017 1:51am
Forum: E-Bike Non-hub Motor Drives
Topic: Freewheeling Design for the Shimano Hollowtec II Crankset
Replies: 42
Views: 2186

Re: Freewheeling Design for the Shimano Hollowtec II Cranks

spinningmagnets wrote:The PAS magnets are a sweet added dessert, but...the steak in this entree is awesome. Well done! Thanks for posting.
Thanks spinningmagnets, glad you like my spinning magnets :lol:
by bh4801
Sep 28 2017 1:43am
Forum: E-Bike Non-hub Motor Drives
Topic: Freewheeling Design for the Shimano Hollowtec II Crankset
Replies: 42
Views: 2186

Re: Freewheeling Design for the Shimano Hollowtec II Cranks

Is this a crankset you made yourself? Or purchased somewhere else? Some parts I purchased, some of them I had made to my specification acc. to 3D design. The shopping list comprised the Shimano FC-M815-2 crankset, 2 x 38T 104mm BCD 5mm thick DH chainrings, a set of 4 15mm long MORTOP DH chainring b...
by bh4801
Sep 27 2017 3:02pm
Forum: E-Bike Non-hub Motor Drives
Topic: Freewheeling Design for the Shimano Hollowtec II Crankset
Replies: 42
Views: 2186

Re: Freewheeling Design for the Shimano Hollowtec II Cranks

amberwolf wrote:Bh4801, what are you trying to say with your pictures?
A picture speaks a thousand words, or so.
The topic comes up now and then so for your viewing pleasure (hopefully) I posted images of my Shimano Hollowtech Saint freewheeling crankset.
by bh4801
Sep 27 2017 1:33pm
Forum: E-Bike Non-hub Motor Drives
Topic: Freewheeling Design for the Shimano Hollowtec II Crankset
Replies: 42
Views: 2186

Re: Freewheeling Design for the Shimano Hollowtec II Cranks

20170519_160721.jpg
20170519_160721.jpg (78.88 KiB) Viewed 1009 times
Polyurethane V-profile compression seal
by bh4801
Sep 27 2017 1:32pm
Forum: E-Bike Non-hub Motor Drives
Topic: Freewheeling Design for the Shimano Hollowtec II Crankset
Replies: 42
Views: 2186

Re: Freewheeling Design for the Shimano Hollowtec II Cranks

20160502_130710.jpg
20160502_130710.jpg (78.47 KiB) Viewed 1012 times
Stieber CSK35PP sprag clutch with a support bearing
This is STRONG AND STEALTH.
No ENO clicking.

The Stieber CSK35PP is rated at 175 Nm nominal, twice that max.
At 170 mm crank length, the crankset is strong enough for a 100 kg / 220 lbs rider STOMPING on his pedals :twisted:
by bh4801
Sep 27 2017 1:32pm
Forum: E-Bike Non-hub Motor Drives
Topic: Freewheeling Design for the Shimano Hollowtec II Crankset
Replies: 42
Views: 2186

Re: Freewheeling Design for the Shimano Hollowtec II Cranks

20160513_195149.jpg
20160513_195149.jpg (99.25 KiB) Viewed 1008 times
Chainline is 51mm. Exactly the same as original.
by bh4801
Sep 27 2017 1:31pm
Forum: E-Bike Non-hub Motor Drives
Topic: Freewheeling Design for the Shimano Hollowtec II Crankset
Replies: 42
Views: 2186

Re: Freewheeling Design for the Shimano Hollowtec II Cranks

20170519_192058.jpg
20170519_192058.jpg (111.14 KiB) Viewed 1009 times
18 magnet ring for cadence sensing. It takes a quarter revolution to obtain an averaged reading of cadence plus direction
Likewise, power off is real - time, no delay
by bh4801
Sep 27 2017 1:30pm
Forum: E-Bike Non-hub Motor Drives
Topic: Freewheeling Design for the Shimano Hollowtec II Crankset
Replies: 42
Views: 2186

Re: Freewheeling Design for the Shimano Hollowtec II Cranks

20170519_192118.jpg
20170519_192118.jpg (70.57 KiB) Viewed 1006 times
Shimano Saint Hollowtech freewheeling crankset 170mm arm 2 x 38t 104mm BCD chainrings
by bh4801
Sep 25 2017 5:45pm
Forum: Battery Technology
Topic: Looking for a battery charger (with balance)
Replies: 14
Views: 825

Re: Looking for a battery charger (with balance)

... I really, seriously, don't understand why people keep using LiPo's for E-bikes after all those accident reports. For your information, it's considered playing with fire (literally) when you do any charge mode on your LiPo's without BMS. :roll: If I understand correctly, A123 is ~130 Wh/kg, LiPo...
by bh4801
Sep 14 2017 9:17am
Forum: Battery Technology
Topic: Looking for a battery charger (with balance)
Replies: 14
Views: 825

Re: Looking for a battery charger (with balance)

639EUR???? I only need an RC charger to balance the cells once in a while... For everyday charging I use Grin's Satiator which costs less than half of that (300$) and it's the most reliable charger I have ever seen. It's true that you get what you pay for, but with that amount I can burn 20+ of tho...
by bh4801
Sep 14 2017 8:43am
Forum: Battery Technology
Topic: Looking for a battery charger (with balance)
Replies: 14
Views: 825

Re: Looking for a battery charger (with balance)

10+S.. Use a bulk charger and either a BMS or cell monitors for balancing. This will give you access to cheaper , high current, charging. Otherwise, you are restricted to expensive 10-14s balance chargers. What is expensive? Have we already forgotten what a BMS did to Dan's house? https://endless-s...
by bh4801
Sep 14 2017 8:35am
Forum: Battery Technology
Topic: Looking for a battery charger (with balance)
Replies: 14
Views: 825

Re: Looking for a battery charger (with balance)

Remember to always power up the charger before you connect the battery to prevent the inrush spark. I do it, and still - when I connect the battery it sparks big time, including even through the delicate JST balance leads. It's amazing how those devices are so poorly engineered (even the ones that ...
by bh4801
Sep 02 2017 1:28pm
Forum: Items for Sale - New
Topic: Tangent Motors RC mid drive kit
Replies: 158
Views: 28535

Re: Tangent Motors RC mid drive kit

What is the advantage of the 6kw motor respect the smaller one? I want to buy the 6kw motor not for running at 6kw but for being able to run at 3kw without stressing the motor. I will use the lipo multistar battery in 12S 16Ah. What do you think about? Hi ES Although I do not own a Tangent, the rid...