6-WD pusher

Hi guys,
I'm thinking of maing a 6wd rambot, but I need a bit of help.
Drive: 2 speed 900@24v on a 5:1 or a 10:1 ratio(drive leading to middle wheel then 30 tooth cog on each wheel and a chain going around all of them to give them drive)
wheels: 100mm blue wheels
ESC: 2x SyRen 25a (with fans on each)
Battery: 24v 3300mAh NiMh
chasis: 15mm HDPE with 4mm steel plate protection
Lid: 3mm ali checker plate
Scoop: either 5mm hardox or 5mm G5 Ti(if i have a the money)

Any comments would be grately appretiated.

sounds good although i wouldn't recommend syren controllers. they are just single channel versions of sabretooth 2x25 so will probably not be able to handle the speed 900s at 24v. daves rambot satanix uses victor speed controllers. i dunno how many amps speed 900s draw but you'll probably want to work out how current they'll be pulling then look at acceptable speed controllers.

I remember David Weston telling me about Satanix running Speed 900's on drive and I think he said Victor ESC's worked best for him.

Weight might be an issue too, I know that my front scoop is 4mm (I think) steel and is heavier than I expected it would be so covering the whole bot in that might be an issue. Considering it will presumably be fairly big (compared to something like tiny toon/satanix) to fit the 6 wheels in. But I don't know, you might manage it :D .

EDIT: Ach, Jonny beat me to it :lol:

i think he (david weston) was talking of putting a wotty 180 in it as the victors kept breaking

Its the fans on Victors that break very easily. I think the Victors themselves are fine.

I think its a Wotty 100 he is talking about putting in it, thats a new FW speed controller by Ian Watts but was saying it is a bit on the large side, which is why I didn't go for one is Cicatrix. Its a 2 channel 50A per channel ESC.

do you know how much one of those costs tony? sidewinders are nice and compact but a bit ott for a feather although you could always upgrade to 4 speed 900's without changing the speedo (relentless runs this setup) or you could use dewalts and a sidewinder like 540

I'm not 100% on cost, I think they are £200. I have a spec sheet that Ian sent me if you want i'll forward it onto you?

sure :)

Quote:

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Originally Posted by Anttazz

I think its a Wotty 100 he is talking about putting in it, thats a new FW speed controller by Ian Watts but was saying it is a bit on the large side, which is why I didn't go for one is Cicatrix. Its a 2 channel 50A per channel ESC.

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How big and where could I obtain such a device?

you can get them from ian watts, i beleive craig colliass has a couple so you could ask him for the dimensions

PM'ing you the spec sheet now Ceri

Ohhh and I have the dimensions too, sorry forgot they weren't on that spec sheet.

Its 120 x 95 x 34 mm

Quote:

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Originally Posted by Anttazz

Ohhh and I have the dimensions too, sorry forgot they weren't on that spec sheet.

Its 120 x 95 x 34 mm

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Thanks,I've got it. Don't think it says a great deal though.
Ruddy hell, that's a big speed controller! My IBC is only 135*55*30.

right,
I hope it will be underweight as i am using 15mm HDPE and 4mm steel(hardened for the scoop)
I'll proberbly run it on a 8:1 ratio
The ESC will either be a victor ar the SIDEWINDER!
I'll try to make it as small as possible

There was talk of trying to miniaturise it a bit as I think a number of feathers were having the same problem I was with the size of it. I remember David telling me he had mentioned making it similar sizes to a battery pack instead.

Also Tony can you PM me the specsheet please.

Sure can.

Thanks Tony,
By the looks of it the new specs are
Drive: 6-wd running on 2x speed 900 @ 24v on a 8:1 ratio
ESC: Victor 883
Power: 24v 3300mah nimh
Size: As small as possible
Armour: 15mm HDPE and 4mm Steel

I think you'll need 2 Victor 883's but other than that it seems ok

yeah I meant 2 victor 883's

Hiya folks

Satanix's victors have always ran fine, but the cooling fans are a tad delicate for the application, I ran them at edinburgh without them and they ran fine without them. I run my 900s on 18v and a 6:1 ratio, 130mm wheels, which is a tad fast, I would recommend a higher ratio than mine (10:1 is recommended).

The victor 883s also run a 6WD robot called Pain In The Asp, and that runs 1HP Astroflight motors. not sure what ratio.