Good advice if ever I've heard it.
And I'm sigging that if you don't mind! :lol:
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Good advice if ever I've heard it.
And I'm sigging that if you don't mind! :lol:
It's probably more than 6 times if you include the corona that goes stupidly far into spaaaaaaaaaaaaaaaaaaaaaaaccee...
Just noticed my battery packs exceed the perimeters for sabretooth controllers, 25v with 42 batteries? Way over. I'm assuming I can modify the packs I've bought so that I use less cells, this depends on how much current I need, would 3300mAh be enough for a 4wd 18v pusher?
I think I could modify it and change them to two packs of 12v 3300mAh, but that would leave me with 20 cells, which I noticed Gary said in another thread burnt out sabretooth controllers he had bought. 10.8v batteries? That keeps me in the perimeter? Aaaaah
Edit: Or simpler, 25v with 21 cells, that doesn't exceed the perimeters by much and drops half the cells? Thoughts are desperately needed!
Thanks again
Hm, does anybody know any good countersunk allen head screw vendors? Me typing it into google only shows up naff results.
Thanks!
I got some recently from this eBay seller: http://www.ebay.co.uk/itm/M6-X-30-COUNT ... 1047wt_905
He has different sizes and quantities too.
10quid for 100?? get yourself down to a fastners place, think i paid about £2 last time for similar
Found a site that sold m6*40 for 6 quid or something, only bought 50 though.
Couldn't find anything called 'fasteners place'? eBay seemed to expensive though. :lol:
Thanks anyway guys!
where you based?
Lewes in East sussex, same as the Terror Turtle team. I'm up in Whitby, Yorkshire at the moment though. I don't think there are many east sussex roboteers. :(
Active teams i can think of are Turtle, Big Brother, Barbaric Response, not sure about feather teams.
Just search for Fasteners in google or yell.com, most will have a trade counter.
I'm half an hour away near tunbridge wells but I haven't even finished my first robot yet so I'm not a lot of use to you
Would that be Crowborough then?
Yes
I have a friend who lives there, so I've been driven the distance before :)
What jigsaw setup would be best for HDPE? Steel, Aluminium or Wood?
wood is best but if you run it too fast the plastic will melt and clog the blade up, a hand saw is much easier for the big cuts
I read a manual that said Aluminium blades were best? As long as you constantly spray it with water and move the jigsaw slowly. The trouble with hacksaws is it's hard to get a straight cut. Why would the Wood saw be better? I'll trust your judgement but curiosity wouldn't kill the cat in this circumstance.
well a wood blades teeth are much more spread out so your less likely to clog up imo
Got the first piece done, rasped down the sides and now I've just got to angle the front edge at 45 degrees.
The amount of swarf you get off the stuff! It's ridiculous!
Got all the pieces cut now, Jigsaw plus constant water spray worked ruddy well and it was quick!
Blue wheels FINALLY arrived, after 1 and a half weeks of waiting!
Should I be able to slip them onto the drills easily or do I need to clamp the axle because at the moment they aren't going the whole way in?
Plus: I can't find a design for a motor mount, does anyone have one or can describe one to me that I might use? Thanks
i just stick a screwdriver in the end of the motor so it cant move and screw the wheel on.
as for mounts what i do is drill lots of holes so they make a 3 by 2.5cm rectangle then it remove the center and file it untill a drill motor can fit in, then its only a case of using a hole saw on another bit of plastic for the end of the motor to slot in. total cost of about 5 quid.
Cicatrix' motors are entirely supported by the gearbox end as Harry described in the first half of his description then further held in using plates from the drill being screwed in through the plastic from the wheel end.
Aaah! Yes I remember now, there was a video of that setup being built, but I don't have the link?
:oops:
Thanks again! Got some of the holes drilled and countersunk, one went wrong so we had to use some synthetic metal to fix it, but such is life not being a robot :lol:
All finished with the body, total weight is about 7.5kg Gonna take it back to good ol' Lewes to do the wiring, has anyone any advice or know how on modifying NiMh batteries? I have 6 8.4v battery packs and I want to convert them so I have 4 9.2v
dont short them :proud: nope its pretty simple, take cell out, put another in
And wrap it with heatshrink? Or just some good old insulating tape? :wink:
I tend to cover mine in a layer of insulation tape followed by a layer of gaffa tape. None of this heatshrink malarky for me :lol:
(although I've seen an Australian roboteer use empty coke bottles melted with a heat gun as a form of heatshrink - pretty cool solution)
I can garanty the coke bottle shrink wrap option. It works, but pretty?
I plan to do that, lol. Would a decent hair-dryer suffice?
I doubt it, although you're welcome to try.
Heat guns tend to operate in the high temperature range (mine is 500°C) which is a bit stronger than your typical hair-dryer. Alternatively, if you don't have a heat gun, you could fire up your cooker (if it has gas hobs) and shrink the coke bottle using the heat from the flames. I'm sure you'll also realise this but, in the interests of safety, the second option would be a pretty dangerous way to do it, with possible burned fingers/hand/body/house if it goes wrong!
What should I use to attach bike tyres to the blue wheels? Conventional wood screws?
yep should work fine
And what size? I can't tell. The tyres about 4mm thick. plus however much rubber there is on the wheels? Gaaaah,I don't want to mess it up this late in the build!
You'd have to do something pretty out-of-this-world to mess up the process of screwing bike tyre onto blue wheels. Just experiment; if you've got wood screws handy that seem like they might be the right size, try them. If they don't seem like they're holding the tyre on well enough, get longer ones. If they won't screw down all the way, they've probably gone through the blue tread and are now trying to get through the harder black plastic, in which case, get hold of some shorter ones.
Is there such thing as a 18v switch? I can only find 12v ones and I'd like to simplify my power link so that it's easier to turn on and off. :?
You can't use a switch. It has to be a removable link.
A removable link is simple. Plug the link in - power on, pull the link out - power off. Doesn't break or short due to impact.Quote:
Originally Posted by Roland
Not just a good idea - It's the law!
But it burns less calories flicking a switch. :rofl:
Ok sure, I've made a link already so no worries!
Thanks thanks thanks to you all very helpful people. :)
Holy balls on the walls, I made it through GCSE's and I'm back to finish what I started.
Trying to find a site that sells bulk deans connectors but to no avail, I'm overhauling the electronics and getting tidbits done now so I'm back on the move. Oh, and I managed to mess up the bike tyre idea really badly, turns out it needs two layers of bike tyre rather than just one so I've gotta head down to the dump to find some old tyres, joy.
Questions for you lovely people:
1. Where can I buy deans connectors 24v in bulk? I've found http://www.aliexpress.com/store/product ... 30490.html but if it's shipped from China then it'll take days to get here :c
I'll have some questions about the Scorpion something whatever it's name is and the receiver connections later this week but I'll need to take some photos to show the issue, so glad to be back and I hope you all had a great christmas. :D