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Dual ESC for Skid-loader / forklift: RC Mixing question. Impossible?

Dual ESC for Skid-loader / forklift: RC Mixing question. Impossible?

Old 02-22-2011, 09:13 PM
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Default Dual ESC for Skid-loader / forklift: RC Mixing question. Impossible?

Hi gang,

This may be impossible, but I figure that I'd ask you experts! I've built a forklift with left/right drive wheels. It's a biggie - about 2 feet on a side, able to lift 40 pounds. On each side is a 6 inch drive wheel, driven by an independent motor.

Each of the two independent motors are connected to a separate electronic speed control. Each esc is connected to a separate servo channel from a Futaba 4PL transmitter/R2104GF receiver.

So far, it works like a champ. Well, sorta.

The left motor responds perfectly to the trigger-throttle control. The right motor responds perfectly to the steering control.

Somehow, there must be a way to use "mixing" to do the following:
Throttle control should make both wheels turn together
Steering control should cause one wheel to turn more than the other (so as to turn the forklift as a skid-loader should)

I've fooled a bit with the mixing system on the Futaba 4PL, but I'm pretty lost.

Am I trying to do the impossible??

Many thanx!

-Cliff (on a starlit evening in Oakland California)
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Old 02-23-2011, 03:37 PM
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This is not something I'm familiar with, personally, but I know that Tamiya and a few other companies make RC tanks that operate on the same premise. I've never built one, so I don't know if it is a transmission or electronic steering system. That might be one place to get ideas, though.
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Old 02-24-2011, 12:13 PM
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Maybe a v-tail mixer would be your awnser
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Old 02-24-2011, 12:31 PM
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http://www3.towerhobbies.com/cgi-bin...?&I=LXHHS4&P=7 Maybe this would work
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Old 02-24-2011, 12:49 PM
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here is my opinion.

wire your two motor ESCs on the throttle. so when you pull the trigger both motors will work (forward or reverse).

then
wire a servo to your steering. The servo will trigger two switches... these switches will cut-off the signal wire (or the power wires) of the two escs (one switch for each).

That way when you turn the steering to the left the esc for the left motor will switch-off (no signal/no power) so that the left motor will not work ... since only the right motor is running the fork lift will turn on that side (left).

do same with the other side to make it turn right.

instead of a switch, may be a relay will also work.
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