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?
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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?
14AWG is good for 32a apparently.
http://www.powerstream.com/Wire_Size.htm
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?
I don't really know, as an estimate I'd say 8a max?
depends what the load is.
At a stall the amps woulb be considerably more then it just running freely
what i was getting at is...will 14awg wire be enough?
heres a photo of my pivot bracket for my lifter motor, parts arrived today so thought I would get on with it.
http://www.airsofters.co.uk/forums/p...pictureid=1176
It should be more than enough.
Looking really good by the way!
Cool! It's looking like a good robot!!!
thanks guys, not bad for a first featherweight
I've started the wiring for the bot, while waiting parts coming.
I've fitted an in-line fuse where the batterys connect, i was thinking of making the fuse rating the continious rating of the ESC? what do you think?
Also i was thinking of putting my link here: this is beside the weapon motor however it is away from moving parts will this be ok?
http://forums.airsofters.co.uk/pictu...pictureid=1177
Usually fuses are rated rather higher than the continuous current rating, i.e. for a 15A continuous controller more like 30/40A and for a 30A perhaps 50/60A - the fets can usually take at least twice the continuous rating for very short periods, it's longer periods that cause so much heating that damage can be done.
thanks. I will put another in-line fuse before the lifter motor but will I need a fuse anywhere else on the robot to comply with the build rules?
You need an inline fuse after the battery IF your using Li-Po's otherwise all other fusing is up to you!
Perfect. What rating should that be just as above, about 30amps?
looking awesome! actutor thing arrived today by the way :)
Depends on both the rating of the li-po pack (should match/be just under peak discharge capacity) and whether you want some more protection for your speed controllers (then you'd go for a smaller fuse, but run the risk of blowing this just through heavy loads/stalled motors).
Are you still using these http://cgi.ebay.co.uk/18-5v-2200MAH-45C ... 231019e093 as I noticed you'd posted earlier? - why two packs, surely simpler to use one?
jonny - glad the lifter arrived today. Hope its what you're after.
Ewan - yes I was thinking of using these. I was going to use two that would give me 4400mah one each side spreads the weight making it even either side. Plus two is a bit different.
OK fair enough if it's for weight distribution, you'll probably want to run them in parallel for easy charging? If so then let's give a conservative 25C peak discharge for them (being cheap) which equates to 110A (25 x 4.4Ah). For your robot (not a very big weapon motor, maximum drain will probably be from lifter motor near-stall) I'd say a 100A fuse would do fine and be ample protection for your batteries (and would most importantly trip if there's a power-circuit short). Could run even smaller if you're concerned about your speed controllers.
wow 100amp fuse now we're talking.lol
I will be running them in parallel for charging and 18.5v will be enough as they are 12v drill motors.
thanks for that I'll get a few ordered.
does anyone know where to get 100amp mini blade fuses?
maxi fuses should do....albeit i'll need to change my fuse holder now.
will these
http://www.technobotsonline.com/led-...ent-31819.html
work with 18.5v?
Yes
thanks, I take it I won't need to do anything to it, other than wire it up to get it working? will it be be less bright on 18.5v than on 24V?
Yup, wire across the main power leads (in parallel with battery output, just after the link). Just slightly dimmer, should do the job
Perfect my next job then
see build progress as a video.
http://www.youtube.com/watch?v=lOl36p0ZKz4
Is this still being built?
Billy hasn't signed in since early August. It's a shame, I wanted to see this lifter mechanism working! Anyone got contact details for him? Ask him to update us!
hi all,
yes still being built - just back from over seas with the T.A
so i'll be plodding along with my bot soon i hope. Alot of catching up to do.
Oh great, I'm looking forward to it. I am interested to see how your lifter performs as I may do something similar. :)
hopefully it'll work great. I'll do a test run and get a video on.
update
=======
OK i've been away for a while and getting back to bot building. I've been looking at my bot and in short it's sh*te. I've have two much space in parts that I don't need and not enough in areas that I do....so I've ordered some new material and the bot will be similar in design but be smaller - new size will be 400mm long x 300mm wide height approx 150mm.
side view
=======
http://forums.airsofters.co.uk/pictu...pictureid=1733
http://forums.airsofters.co.uk/pictu...pictureid=1734
The base arrived today
300 x 400mm x 3mm aluminium plate:
I've ordered 2 of Gimosn Robotic motors for drive, and 100mm blue wheels.
http://www.gimsonrobotics.co.uk/prod...erse-screw.jpg
I've also ordered a motor and lifter arm from a rover front car seat here:
http://mijautos.com/ebay/CIMG3897.jpg
This will be attached to my lifter and will be ran on 18.5v also (rather than 12v)
I was planning on using another Gimson motor with a car jack threaded rod however went with this option as suggest on another thread.
some parts have arrived so got to work:
http://forums.airsofters.co.uk/pictu...pictureid=1762
http://forums.airsofters.co.uk/pictu...pictureid=1761
http://forums.airsofters.co.uk/pictu...pictureid=1760
well......i've been working away on the bot, photos to come shortly. But i'm awaiting parts to arrive first before I can go any further. I have changed the design (again) however the drawing below is the final (ish) design:
http://forums.airsofters.co.uk/pictu...pictureid=1778
Are you sure? If your like me it changes every day. I've now started on my 1st design
well.....not really... i just play it by ear. Make changes on the way.lol
whats the chequer for on the side?