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The future of servos? — Parallax Forums

The future of servos?

Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
edited 2009-01-06 01:35 in General Discussion
Check out these Futaba "robotic" servos:

····http://forums.parallaxinc.com/www.rc.futaba.co.jp/hobby_en/04_robot/accessory.html
····www.rc.futaba.co.jp/hobby_en/04_robot/manual/RS601CR_manual_Ver116.pdf

I haven't seen any prices or dealers for them stateside, though. [noparse][[/noparse]drool]

-Phil

Comments

  • PhilldapillPhilldapill Posts: 1,283
    edited 2009-01-04 16:06
    Very Impressive!
  • sailman58sailman58 Posts: 162
    edited 2009-01-04 16:51
    They look expensive! At least more expensive than 3 standard servos for $25!
  • CapdiamontCapdiamont Posts: 218
    edited 2009-01-04 18:11
    They say indoor only, default data rate 115,200, can be set to 9,600. Half duplex.
  • soshimososhimo Posts: 215
    edited 2009-01-05 05:36
    At first I thought the torque is crappy until I read that it's in kg! I have a 650mg servo that I use on an 8th scale buggy for turning - and that's still only .65g. These things have 21kg! Unless I'm reading that wrong, but it seems like they could actuate a tank hatch. Speed is a little slow though. Most digital servos have .1 s/60degree speed these days. At least the ones I use on 500 size heli's. The slow speed might be compensated by the huge torque values though (again, unless I'm missing something, I'm not a mechanical engineer).
  • HumanoidoHumanoido Posts: 5,770
    edited 2009-01-05 15:43
    In Japan, these servos are used for up-scaling smaller 12-inch high humanoid
    robots into something similar to HONDA's ASIMO. If the price drops to
    competitive levels, we'll see some amazing sized humanoids or very big
    Penguins.

    humanoido
  • soshimososhimo Posts: 215
    edited 2009-01-05 18:13
    Humanoido said...
    In Japan, these servos are used for up-scaling smaller 12-inch high humanoid
    robots into something similar to HONDA's ASIMO. If the price drops to
    competitive levels, we'll see some amazing sized humanoids or very big
    Penguins.

    humanoido

    That explains the gargantuan torque values. At 21kg thats .85hp (different units, I converted from SI). I converted 21kg to ft/lb (not sure if that's valid, but it comes out to approximately 37 ft/lbs). I then used the formula hp = 2xPIxrpmxtorque and divided by 33000 (a constant for non-metric horsepower conversion). I calculated rpm by taking .17s / 60 degrees which ends up approximately 120rpm. That yields almost one horsepower per servo. I have .33cc engines I use for model aircraft with less power output than that - and those are internal combustion engines. There are some powerful electric motors in these guys.
  • John AbshierJohn Abshier Posts: 1,116
    edited 2009-01-05 22:21
    21 kg-cm equals 1.52 ft-pounds or 291 oz-in. Max current is 3 amps at 9.6 volts, about 30 watts or 0.04 horsepower

    John Abshier
  • soshimososhimo Posts: 215
    edited 2009-01-06 01:05
    Thanks for the math check John - I was off due to using kg/m, not kg/cm. Still impressive at 30 watts. Now, quick, how many BTU's is that? tongue.gif
  • boe-crazyboe-crazy Posts: 53
    edited 2009-01-06 01:35
    You could almost use those for a motorized lawn chair, with automatic recline!

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