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[blazerbotics]

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not unless you found aload of ti hanging around. As your looking at the same weight then as EVs. One pair of Golds will be enough as long as you get the gearing correct.

[robotic_ants]

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Too much! The weight would be a bugger with them coming in at 1.4Kg so thats 2.8Kg for the motors then probably around 2Kg in batterys to supply them with power but then another large bump comes when these things start pulling amps as they can peak at about 198A so that means they would require a high power controller like a Vantec or Victor.

Another little side note for the Evs is that their timed to one direction so unless you are willing to re-time them, you will require one CCW and one CW. But because they are now getting harder to come by CW Evs are getting quite rare. I luckily have two CCW motors and one CW but there for another project.

Chris

[geoff]

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If I may put my two pennies into this conversation...
If you are looking for serious drive for a feather take a quick look at... http://www.pillowtorque.com/tech.htmhttp://www.pillowtorque.com/tech.htm
The reason we setteled on the Astroflight gear motors was very simple....WEIGHT! (motor and gearbox bearly 700g with more torque than is reasonable!) against 860g +/- for a gold on its own, before you even think about gearing, wheels etc!
The whole drive system on Pillow Torque weighs just under 1.9Kg per side.. (Astros, motor mounts, pullies, belts, both wheels, axels & bearings!)

[psychostorm]

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Theres one of things I wanted to ask you Geoff, were did you get Pillow torques bearings from?

[big_nipper]

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NuTool Have come out with 36V drills at around 40 pounds each, we use the 30V ones with great results, but are now more expensive than the 36V ones as they dont make them anymore. You get 1.7Ah NiCads and a 1 hour fast charger along with the gearbox which is alot stronger than standard 18V ones.

Weve not used the 36V ones but the drill is the same size with just a slightly bigger battery pack. On litter Hitter each motor, gearbox, wheel and mounting setup is just under 1.5kg (I think, Graeme can you confirm?).

Using 2 motors and 80mm wheels is not quide as fast a pillow torque, but the setup is alot cheaper and you could always try bigger wheels.

[geoff]

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Ceri, the bearings for pillow Torques wheels are simple 1/2 single row radial ball bearings from RS components. The internal nylon 6 bulkheads were drilled out to suit and the bearings were then pressed in.

[Guest]

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What about:

Speed 900 BB Torque

[cavecrusher]

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or use the bonx system, as in a 2-speed gearbox, which gives me or 13 mph or 700 rpm

there just standard 2 speed geared drill motors

[Guest]

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What about using a t-box with titan 550 motors or something similar? Or stock rc car motors?

[Guest]

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SS2 Gearbox/Motor Combo = £86.34 = 1.02Kg = 1.43hp @24V

Thats not quite right. 4 x SS2s + 150mm Wheels + GP3300 24V pack = 1.62hp in the EDT software. Also 26km/hr top speed in a 12kg and 24kg robot. So a rammer pushing another robot WILL hit the same top speed as it would go if it wasnt pushing anything. And trust me on this. Our new Hellbringer has this exact setup and was pushing robots into the walls at over 20km/hr.

[Guest]

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Yeh but four of them?

[blazerbotics]

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but your looking at 4.5kg for motors/gearboxes if you use 4. and what speedcontroller are you planning on using? as each motor can probably pull over 150 amps each (stall). Ats all well and good having this much power, but can you get enough traction?

[Kenny]

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i would recomend the IFI victors there small and could take any motor you stick in a feather

[Guest]

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Never mind weight, look at price. I could use 2 and use a belt drive or similar to drive 2 wheels.

[Guest]

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By the way does anybody do gearboxes for gold motors?