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Old Jun 24, 2004, 02:59 PM
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4mm pager motor actuator?


I see references to 4mm pager motor actuators, but is there a thread somewhere here that explains how they work or how to construct one? Search has not helped me here.

Thanks,
Len
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Old Jun 24, 2004, 03:20 PM
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Check out www.Smarttoolsinc.com


Greg
Old Jun 24, 2004, 04:39 PM
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motor actuator


it's clear on the pic:the 4 mm,40 ohms didel pager is on the fix stab,and the axle on the moving part,and connected in place of standard actuator
cheap,simple and efficient!
patrick .
Old Jun 24, 2004, 04:43 PM
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i forgot:hinges are the pink thin rubber treads.(fishing shops)
Old Jun 24, 2004, 04:49 PM
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Thanks! - incredibly simple
Old Jun 24, 2004, 05:14 PM
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Partick,

Just for the record, if those motors are 4mm that would make the foam you used about 2mm. Correct? I am still learning about foam thickness and it's uses. Thanks.

Dave
Old Jun 24, 2004, 06:19 PM
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Looks like Selitac to me. In that case it is 2mm.

Michael
Old Jun 24, 2004, 07:48 PM
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I would like to try and construct one. I have quite a few pager motors that need a good project!
Old Jun 24, 2004, 08:10 PM
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Quote:
Originally Posted by bleriot 11
i forgot:hinges are the pink thin rubber treads.(fishing shops)
Can you tell me more about those hinges? Do you have a closeup photo showing how they are used? Thanks, Jerry
Old Jun 24, 2004, 08:33 PM
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Nice Patrick, cant get more simler than that!! How much torque does the 4mm have?

Uttam
Old Jun 24, 2004, 09:37 PM
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I have a Zip-Zap steering 'servo' for an actuator. I made centering action by use of a security-tag strip-spring. Works nice, too much power tough. 6mm short 30 Ohm. From CVS 1ch IR car.
Old Jun 24, 2004, 11:34 PM
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Quote:
Originally Posted by bleriot 11
it's clear on the pic:the 4 mm,40 ohms didel pager is on the fix stab,and the axle on the moving part,and connected in place of standard actuator
cheap,simple and efficient!
patrick .

But how do you keep it from just spinning and reaming out the hole the axil is connected to if you happen to hold the stick in one position too long ?
It would seem that you could only use it in a "tapping the radio stick" sort of way,or do you have some kind of stops to keep the motor from making a full revolution ?
Randy
Old Jun 25, 2004, 12:27 AM
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Aren't these "servos" going to be Wham-Bam ... full extreme up or down only? Or is tapping the stick actually going to get partial movements?

And, would it ever be possible to get them to center?
Old Jun 25, 2004, 01:19 AM
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I wouldnt want to answer on behalf of Patrick, but I'm quite sure the servos are not "bang-bang". You just connect the motor in place of the actuator and get the same proportional movement. You center them just like all actuators, just use a rubber bands like Patrick has used to center back, the 4mm motors move very freely and even light rubber "springs" should work.

Uttam
Old Jun 25, 2004, 01:32 AM
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it is selitac 2 mm foam from a danish people in germany!!
just one hinge on rudder glued with ca,and 2 on the elevator(glued to have neutral position)
the motor torque is equal rubber one at about 30 angle.
a bit less torque than strong actuators but no problems in flight.
motor axle glued in a hard balsa piece.
patrick.


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