Search found 15 matches

by tentman
Feb 14 2019 5:12am
Forum: E-Bike Non-hub Motor Drives
Topic: New Approach to 4500W Mid Drive
Replies: 40
Views: 1462

Re: New Approach to 4500W Mid Drive

The materiel in bike frame tubes is very thin and a principle I learned in building boat masts was to ensure all "load points" had wide, ideally tapered bearing surfaces . . . I liked your first clamp idea better.
by tentman
Feb 10 2019 11:26pm
Forum: E-Bike Non-hub Motor Drives
Topic: New Approach to 4500W Mid Drive
Replies: 40
Views: 1462

Re: New Approach to 4500W Mid Drive

Hello again - do Banebots have data online about the ratings of their gearsets - I can't find it . . . where/how did you get the specs (I want the specs of their bigger offerings). Thanks
by tentman
Feb 09 2019 8:46pm
Forum: E-Bike Non-hub Motor Drives
Topic: New Approach to 4500W Mid Drive
Replies: 40
Views: 1462

Re: New Approach to 4500W Mid Drive

Hello - interesting ideas. Do you have a reference for the allowable torque on the outside end of these Banebot Planentries (I can't find one), and which model are you considering. Thanks
by tentman
Feb 04 2019 3:29am
Forum: E-Bike General Discussion
Topic: volting up and gearing down
Replies: 7
Views: 272

Re: volting up and gearing down

Thanks very much Amberwolf, particularly for the search results, my searches are not that effective at the moment as I'm still figuring out the jargon . . . .
by tentman
Feb 04 2019 2:58am
Forum: E-Bike General Discussion
Topic: volting up and gearing down
Replies: 7
Views: 272

volting up and gearing down

In the Snow beast refurb thread DkAngel makes the above reference . . . . and it makes a whole lot of sense to me. What I'd like to understand is how far it can be taken, the limits of "gearing down" are pretty obvious, but "volting up" is a little more difficult to get ones head around. If a motor ...
by tentman
Jan 22 2019 1:46pm
Forum: E-Bike Technical
Topic: Alternative Battery packs
Replies: 6
Views: 329

Alternative Battery packs

Hello Guys Down here in New Zealand we seem to pay more for everthing,and I assure you its not by choice! The most cost effective packs I can find here are from Luna, and bless them, their packs are about NZ$1140 per kWh. High quality cells are about $13 each. So I've been on the hunt for some time ...
by tentman
Jan 21 2019 2:31am
Forum: Large EV General Discussion
Topic: R/C EV 'groundskeeper' project
Replies: 5
Views: 814

Re: R/C EV 'groundskeeper' project

Hello - Interesting project, very similar to one that has been "in my head" for a long time. I'm stalled on finding suitable reduction units (something around 25 or 40:1) that can be had "off the shelf" with a reasonable chance of obtaining spare parts in the future. What did you havd in mind for yo...
by tentman
Jan 12 2019 1:45am
Forum: E-Bike General Discussion
Topic: Controllers, Torque and heat
Replies: 9
Views: 385

Controllers, Torque and heat

Hello Guys Could someone explain to me if it is possible to alter the torque characteristics of a motor through the controller to produce greater torque with less heat. I want to go real slow up hills with a lot of torque (I know I can use gearing to achieve this as well) and it would be nice to kno...
by tentman
Jan 04 2019 3:00am
Forum: E-Bike General Discussion
Topic: A slow build Plan
Replies: 9
Views: 316

Re: A slow build Plan

Hey - thanks for the input guys! I will pedal, I'm pretty fit and can climb the hills myself quicker than most people on foot, the idea of the bike is to cover ground that would otherwise be done in a 4wd, and to get further in the time available. A BBSHD is right in the mix, however I really like t...
by tentman
Jan 03 2019 7:22am
Forum: E-Bike General Discussion
Topic: A slow build Plan
Replies: 9
Views: 316

A slow build Plan

Hello Folks (from southern New Zealand) I'm planning a build for a bike to largely replace my 4wd (and enable me to go further and walk less). I like to be in our mountains, exploring and sometimes hunting. The first quality of my bike will be to climb, its not unusual to have to climb 400M (1500') ...
by tentman
Mar 17 2018 7:47pm
Forum: Large EV General Discussion
Topic: Reduction Gearboxes
Replies: 7
Views: 804

Re: Reduction Gearboxes

I sorta figured that, but finding the right torque rating seems to be the hardest part (most are not strong enough). The motors of the appropriate power (1.5-2.0 kw) that I've been looking at are around 4000 rpm mark. From what I've seen once I find something with suitable torque ratings I can spec...
by tentman
Mar 16 2018 9:35pm
Forum: Large EV General Discussion
Topic: Reduction Gearboxes
Replies: 7
Views: 804

Re: Reduction Gearboxes

I sorta figured that, but finding the right torque rating seems to be the hardest part (most are not strong enough). The motors of the appropriate power (1.5-2.0 kw) that I've been looking at are around 4000 rpm mark. From what I've seen once I find something with suitable torque ratings I can speci...
by tentman
Mar 16 2018 7:43pm
Forum: Large EV General Discussion
Topic: Reduction Gearboxes
Replies: 7
Views: 804

Reduction Gearboxes

Hello Folks I'm looking for a suitable gearbox for a high torque (at least 100N/m per axle) low output speed (or high reduction ratio) gearbox for a tracked vehicle. I've seen these ones - can anyone identify them or know of similar gearboxes? http://www.alamo-industrial.com/Products/Photos/RidgeRun...
by tentman
Mar 15 2018 5:06am
Forum: E-Vehicles General Discussion
Topic: Agricultural EV's
Replies: 9
Views: 901

Re: Agricultural EV's

Hi Tentman, Am in NZ also, would you be looking building it yourself or having a 3rd party build it? Would your main use be on farm tracks and do you also bulldoze up your fencelines? Gidday - Probly have to build it myself I think, relying heavily on engineering friends but ya always consider all ...
by tentman
Mar 04 2018 7:05pm
Forum: E-Vehicles General Discussion
Topic: Agricultural EV's
Replies: 9
Views: 901

Agricultural EV's

Hello Guys (from Southland, New Zealand) My first post after a bit of lurking, so by all means box my ears if I haven't done enough homework but . . . . I'm a fencing contactor, and I'm looking to build an remote controlled off-road EV that will carry my tools (about 75 kgs) and sometimes materials ...