S646se - Full LITHIUM Pack Project - First Attempt

[Burgerman]

Some people just want everything but dont want to think or learn. That just doesent work. But if they are happy that way leave them to it!

[expresso]

i tell you using the pilot chair with lead - Add on - just not the same - i feel it - besides the hard ride - i am not liking the chair as much any more -

i may not bother with this chair much other than change the tires to Air - and maybe consider doing the rear the same way - to soften the ride - but thats it - save my funds for the next chair - will do a full pack again there - cant go back to lead now -

the pilot chair dosnt seem as fast either - the new motors dont seem 8.5mph to me - the Rnet much faster i feel it - could be also that the pilot chair motors are quiet -

where the Rnet - you hear them wine up and down etc, - the sound makes it feel faster - i know its not true - but when its quiet - feels not as fast - the noise adds to the effect of speed -

[Burgerman]

turn up sound, full screen and listen to this one!
http://www.wheelchairdriver.com/BM3-con ... RC-BM3.mp4

From 1 min 25 secs.

[expresso]

nice - i would love to have that speed - sound is music to my ears

[steves1977uk]

That can be your next project expresso, a Roboteq setup with a 45v Lithium battery pack. Then you can say "I feel the need for speeeeeeeed!"

Steve

[expresso]

hey steve - yeah i would love that - but i am afraid thats way above my head - i impressed that i got this far to be honest - with help of course - if it was a simple change of parts only - the joystick etc, - already programmed like what we have now - then just build the pack for a 45v - would be nice if it was that simple

i am good with the speed i have - but any slower and i really feel it -

[curiouscat]

6mph to 16mph is a huge jump. Do you drink Expresso? If so wear a helmet, if and when you get there I've been reading a lot of your posts lately and it wasn't that long ago you were happy to wait for the manufacturers.

BM ever been done for drink driving? I used to get told off in college for carrying tea and driving my chair at the same time. Just because the majority of chair users couldn't drive in a straight line to begin with

[expresso]

yes your right - cat - wasnt long i was just hoping to find the plug and play drop in group24 packs - waiting for manufacturers to do it
i felt sooner or later - i have to find something - and i have - but very expensive - and BMS - smaller pack etc, - all adds up to failure - not much more range - etc, -

i was kidding myself thinking i was going to find something that would do or be as good as how its build here - not only is it cheaper to do this way - its MUCH better - taking the full advantage of the battery - but not long ago i wasnt convinced -

i am glad i got past that point -

[steves1977uk]

6mph to 16mph is a huge jump. Do you drink Expresso? If so wear a helmet, if and when you get there I've been reading a lot of your posts lately and it wasn't that long ago you were happy to wait for the manufacturers.

BM ever been done for drink driving? I used to get told off in college for carrying tea and driving my chair at the same time. Just because the majority of chair users couldn't drive in a straight line to begin with

Ahhh those college years Used to go to the pub every weekend in the final year, used to get very drunk but still manage to drive back to the college in one piece!

Steve

[curiouscat]

Very happy for you Expresso

Steve, sounds like you had fun!

[expresso]

I am curious and interested in adding a steel plate in my battery box to add a bit more weight to offset the removal of the Lead - its been brought to my attention about the safety of the chair with the seating system - and its a valid point

being its half the weight now in the battery box - i am interested in adding a steel plate in there under the battery tray - but i am not sure how much room i will have - i am thinking of getting 1/4 steel cut to the size of the battery tray and lay it in there under the battery tray and leave it there - i mention 1/4 thick because not sure if i can fit 1/2 inch thick - i would prefer 1/2 -

how does this sound - if i get two sheets same size each 1/4 inch - in the event i cant fit both - i use one - and save one for next chair - if i can reuse - depending on chair - and if i can fit both - i use both

anything wrong with this approach ? if anyone has a better idea or solution or a heavier item thats thin - i can use instead of steel ?

i found this place - looks like i can call them - have them make a sheet and ship it to me - cant get easier than that -

http://www.portlandbolt.com/technical/t ... alculator/

i guess i be taking it out once more -

any reason this is not a good idea ? i cant think of any other way to add weight down there - unless i get a ton of cheeseburgers myself and add my own instead - but still dosnt address when chair is up high or tilted

[Burgerman]

Since what you are actually trying to do is lower the center of gravity, adding weight to you or sitting taller with a heavy seat makes it worse.

Adding the 50lb weight you saved into the battery area below the battery is overkill because its sitting below the center of the batteries mass. You will likely need about 25 lb sat this low down, to have the same effect as a 50lb missing battery.

[expresso]

Since what you are actually trying to do is lower the center of gravity, adding weight to you or sitting taller with a heavy seat makes it worse.

Adding the 50lb weight you saved into the battery area below the battery is overkill because its sitting below the center of the batteries mass. You will likely need about 25 lb sat this low down, to have the same effect as a 50lb missing battery.

it wont be 50 lbs at all - i called that place and actually they cant help me - they do something different - so i am looking for another place to get something done - the size i need is about 13 inches long by 9 1/2 inches wide - if i can manage to fit a 1/2 sheet - would be adding approx 20lbs - if i can only fit 1/4 inch - than about 10 pounds

now my search for someone to make me a steel plate - someone - someplace etc, - i would want two 1/4 inch plates - since i cant say for sure if i can fit 1/2 inch -


http://www.albanysteel.net/

[Burgerman]

ebay easy... http://www.ebay.com/bhp/steel-plate

Try lead sheet.

[expresso]

that last place gave me number to another place closer - but still far - i havnt called yet

you say ebay ? how do i search on ebay for a custom size steel plate ? i never find what you guys find when searching - going to try it now and see what i get on ebay -

search terms - steel plates ?


http://www.ebay.com/itm/1-4-250-HRO-Ste ... SwMmBV1gqN

whow it actaully worked - i found this one very close to the size i need - should be good enough as is ? can you explain to me what 250 HRO steel means etc, - what do you think of this one

[Burgerman]

HRO hot rolled and 250 is 250 thou or 1/4 inch. Theres 1/2 inch or 500 too.

[expresso]

HRO hot rolled and 250 is 250 thou or 1/4 inch. Theres 1/2 inch or 500 too.

thanks - the concern i have is i wont be able to fit 1/2 inch thick - its a tight fit as it is now - i think i added some padding on top of the pack - i can remove that if i did - i might have used those white cushion padding that arrives with the Headway cells - to get a nice tight fit when i redid it last

i was thinking of getting 1/4 inch - two in case i am able to fit 1/2 inch - i can use both - if not - use one -

my idea is to just sit it under the battery tray in the chair - not inside the battery tray where the lithium is - what do you think - get a couple of them and paint them first slide it in there and then slide the battery tray over it ?

[Burgerman]

yES..

[expresso]

ok very good - i just called the guy on ebay - he can make it the size i want also - few dollars more - no big deal -

i asked for a 13inch long by 9 1/2 wide - that should fit since i sized the battery tray - should i keep it at this size - or get the listing size of 12 inch by 8 inchs ?


i doubled checked - 13 x 9 1/2 leaves 1/4 inch easy free space - i measured inside the battery tray to be sure i dont get a too large a sheet - he will paypal me an invoice and i will get it - that was the fastest easiest purchase

will sand a little - prime and paint it - now i have to remove that thing again !! - one thing i did fall short on when i built this pack - i could have used a longer cable for both the add on and charge cable - either on the battery end of it or the chair side - its done now -

but i wonder - what if i extend them by adding an extension in between ? another 6 inches would be easier to connect and disconnect when removing and installing it when ever needed ?

i know its not the ideal way - i dont want to take the pack apart to do it right way - one longer cable - -

shouldnt be a big deal right ?

[Burgerman]

No, do it!

Why not hedge your bets and go for 3/16th or 8mm or 10mm plate?

[expresso]

No, do it!

Why not hedge your bets and go for 3/16th or 8mm or 10mm plate?

i can get a 12 inch extension balance cable from Revolectrix and use that in between -


http://www.usastore.revolectrix.com/Pro ... le?whence=

would that be a thicker sheet than 1/4 inch or 1/2 inch - ?

i got the invoice for the 1/4 inch sheet -

i am not good with figuring out these number things - MM - inches etc, - what would that do for me different - my tape measure is basic so i dont know where 3/16 of a inch is compared to 1/4 - vs mm - no metric measure here

[Burgerman]

1/8th is 3mm
1/4 is 2/8ths! 6mm
3/8ths is 9mm
4/8ths is a 1/2 or 12mm

[expresso]

1/8th is 3mm
1/4 is 2/8ths! 6mm
3/8ths is 9mm
4/8ths is a 1/2 or 12mm

Ok - thanks - looking at my measure here - 1/2 inch i may not even have that much room - hard to say for sure - i cant go check it now - i figure get 1/4 inch for sure i can make fit - and if i am lucky - stick another one in there -

which gives me 12mm if i can fit both in there -

he sent me the invoice already - i can call him again and ask if they can make one thicker size and use one sheet - but theres the problem - i dont know for sure how much space i can really use - i am going by looking at my tape measure and remember how tight it was when i added it last time -

i may be able to remove the padded if i added it now - but still that was cushion and gives - steel wont give - it either will fit or not - its a gamble i am taking - i feel at least 1/4 inch can fit - - if i can double it great - if not - i can use it on the next chair if i can -

maybe 3/8 - 9mm maybe - but that may even be too much and then i have nothing -

[expresso]

they dont do Metric sizes -

i can try either 3/8 inch or 1/2 inch one sheet -

or stick to 1/4 inch - two sheets - or get a few of them - ? one 3/8 inch - one 1/2 inch - and one 1/4 inch -

what would that do for me - not sure -

what do you think - just get One sheet 3/8 and thats it ?

[expresso]

i just went with the 3/8 inch - one sheet steel plate and thats it - i start with that and see how that works - cross my fingers - and i am going to make the extension now for the charge cable and ADD on while i am at it -

thanks for the input - suggestions

[Gnomatic]

Why not use a lead plate? Higher density

[expresso]

Why not use a lead plate? Higher density

i have no idea - i was trying to figure that out if there was something thats heavier for the same space etc, - steel was the answer i got - i called a few places

turned out - ebay was easy and i found it - cheap - cut to size -

what could i have used instead of steel plate that would add more weight for the same size ? and where can i get it - thats more important -

its shipped - i can see if it even fits - should add approx 15 to 20 lbs - -

if you know of a place i can get a heavier plate - i check it out -

[Burgerman]

Lead... eBay!

[shirley_hkg]

Fill the void of the battery cover , with a mixture of lead shoot and glue .

It will be heavy , and far back .

[Gnomatic]

http://www.pureleadproducts.com/lead-sheet/

That might be a place to try, but lots of places offer custom sizes etc. Google "Lead sheets" or "Lead plates" you find tons of options!

1/4" thick = 16lbs per sq ft. 3/8" = 25lbs per