# Linear Actuator

I am looking for a linear actuator with the following specs. This may be pushing it, but here's my ideal machine:
1,000 lb force
1 in/sec travel DC motor fits in a 3.5x3.5 inch square tube
I'm able to have gears or bearings or whatever manufactured, if anyone knows of a motor with sufficient torque and speed that, when linked to the (threaded rod?) actuaotr will produce the end specs.
Thanks for any help or guidance.
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Further info:
I've been researching the mechanical advantage of screw drives. I think I've go this about right.
If I use a 1/4 20 screw shaft (all-thread), my motor will need to turn 1200rpm with a torque of around 8 in/lbs.
That seems somewhat reasonable, based on what I've seen in industrial motors. Does anyone know of an affordable (under \$100) source for such a DC motor?
Thanks.

knows
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Let's see. Converting to metric units (sorry !)
force = 1000lbf = 4400N distance = 1" = 0.025 m therefore work done per second = 110 Joules, implying power output of 110 Watts.
In practice motor efficiency is less than 70% (say 50%), and using a screw thread instead of a ball screw means considerably less than 50% . So, multiply all that together, and you need something like a motor input power of 440 Watts ...
Dave

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Thanks, Dave. I'm having much better luck finding products by searching for wattage instead of torque.
Ball screw. Duh. That'll be my next google search!

be
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If you use 1/4-20 all thread with a 1000 lbf, you will very likely remove the threads from the nut and/or rod, Assuming it doesn't just twist.
Look towards the professional manufacturers for the proper materials.
Mike

be
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E. Lee Dickinson wrote:

You may want to look at motors (and complete actuators) for aircraft use, I vaguely recall some with characteristics in this class...
Be prepared to pay **lots** new, but you may be able to find remaindered, surplus or other low cost paths to acquisition.
...Brock.