CALEI -JAC

[billy breach]

Re: CALEI -JAC

ha, typical!

Well the b&Q drill motors sound the like the same ones I bought, although I got mine from robo challenege.

[PJ-27]

Re: CALEI -JAC

You should have seen the last half of the 2nd event!

Bitza dragged itself in making the most god awful noise! Then, unable to get away quickly anymore, got obliterated by LH.........

Maybe RoboChallange get their drill motors from the same supplier as the B&Q drills, I dunno.

[billy breach]

Re: CALEI -JAC

God knows. Just need to try them out and find out.lol

[billy breach]

Re: CALEI -JAC

got my hdpe in today! so i've been plodding away.

The out side is 200mm high, although looks higher in the pics. ( i need the hight for my lifter design). Started work on the lifter motor mounts, and I have two dividers between the wheels and sides, lipos will fit in these either side.

[PJ-27]

Re: CALEI -JAC

2 Li-Po's?

[billy breach]

Re: CALEI -JAC

thats what i'm think or maybe nicads etc. one for weapon and one for drive.

[PJ-27]

Re: CALEI -JAC

Im pretty new to the world of Li-Po so maybe someone else would be better equipped to comment here but 1 Li-Po should be more than enough.

The C rating is the rate of discharge as a division of time. So a 20c pack should theoretically be capable of total discharge in 3mins, since a twentieth of 60mins is 3mins.

3mins is the length of a round, so this works out quite well.

Then to calculate the theoretical constant current your pack can produce, you times the C rating by the Ah rating. So a 20C pack with 3000mah can give a constant current of 60amps.

Depending on the quality of the pack this can vary, and burst ratings can be much higher and sustained for varying amounts of time.

Your drill motors shouldn't be drawing so much current that you'll exceed what a Li-Po can put out, and what with all the start/stop of a fight a 2500mah pack will easily (should...) last the bout.

Decent Ni-Cad cells should be able to supply about 30amps continuous.

[mattsdragons]

Re: CALEI -JAC

looks like a good design

im finding it hard to get a spot for my batteries were they dont move

[billy breach]

Re: CALEI -JAC

thanks. It was hoinh to be covered, but i thought if its flat i can fix hdpe to it easier.

i was going to fit two of these batterys into it?

http://cgi.ebay.co.uk/18-5v-2200MAH-...item231019e093

[PJ-27]

Re: CALEI -JAC

Check this out for loads of info on moving to Lithium. Also look in the RioBotz tutorial.

viewtopic.php?f=111&t=4091

General rule seems to be, you pay for what you get! And what with Li-Po being so volatile (and the fact that your putting it in a COMBAT robot) I wouldn't scrimp.

Anyone got that great vid that Hard Time found of the Li-Po exploding?

[billy breach]

Re: CALEI -JAC

i've used lipo packs for airsofting for a year or two now. I've had one on fire too...cool but not funny at the time.

I'm using 14awg silcone wire. Which should be enough for lipos?

[PJ-27]

Re: CALEI -JAC

14AWG is good for 32a apparently.

http://www.powerstream.com/Wire_Size.htm

[billy breach]

Re: CALEI -JAC

thats a good link to have with the amp rating.

how many amps to do you think a drill motor on 18.5v's would pull?

[PJ-27]

Re: CALEI -JAC

I don't really know, as an estimate I'd say 8a max?

[Laser]

Re: CALEI -JAC

depends what the load is.
At a stall the amps woulb be considerably more then it just running freely