Linear travel
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Subject Author Date
Linear travel GregS 06-19-2008
---> Re: Linear travel mike_l_rossREMOVE06-19-2008
Posted by GregS on June 19, 2008, 12:36 pm
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All I need is about a 1 inch stroke for an application. A solenoid might work
but it might not. I'm considering a small linear actuator or motor. Are there
any good
choices or companies that have a small devices. I have to get the speed down to
100 ms.

greg


Posted by Deep Reset on June 19, 2008, 3:10 pm
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> All I need is about a 1 inch stroke for an application. A solenoid might
> work
> but it might not. I'm considering a small linear actuator or motor. Are
> there any good
> choices or companies that have a small devices. I have to get the speed
> down to 100 ms.

Is that one inch in 1/10th of a second?
What sort of load?



Posted by BRW on June 19, 2008, 4:48 pm
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On Jun 19, 12:36=A0pm, zekfr...@zekfrivolous.com (GregS) wrote:
> All I need is about a 1 inch stroke for an application. A solenoid might =
work
> but it might not. I'm considering a small linear actuator or motor. Are t=
here any good
> choices or companies that have a small devices. I have to get the speed d=
own to 100 ms.
>
> greg

ServoCity (www.servocity.com) has a selection of linear actuators
now. I doubt they are that fast, though - that is 1 inch in 100 ms.
You could roll your own (mechanical system) using a hobby servo
directly pulling and pushing a linear-moving member. Even then, it
still won't be that fast.

BRW

Posted by Robert Roland on June 20, 2008, 9:38 am
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On Thu, 19 Jun 2008 13:48:21 -0700 (PDT), BRW

>You could roll your own (mechanical system) using a hobby servo
>directly pulling and pushing a linear-moving member. Even then, it
>still won't be that fast

Modern tail rotor servos do 60 degrees in less than 100ms. For
example, Futaba's S9256 is rated at 60ms. They're not cheap nor very
strong, though.

The S9256 is rated at 47 oz*in. If you want a full inch travel, you'd
need an arm length of one inch, giving you a max force of 47 oz, or
13N.

Since the servo has a rotating output, you will need some extra
consideration to get the linear output perfectly linear.
--
RoRo


Posted by on June 19, 2008, 5:22 pm
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GregS wrote:

> All I need is about a 1 inch stroke for an application. A solenoid might
> work but it might not. I'm considering a small linear actuator or motor.
> Are there any good choices or companies that have a small devices. I have
> to get the speed down to 100 ms.
>
> greg


If you don't have to control to intermediate positions, I think a solenoid
is going to be your cheapest solution. Any motor that can do that speed
will probably be expensive and require a controller. All you need for a
solenoid is current. The solenoids are faster because they don't have to
drive as much mass.

Surplus 12V solenoids with roughly 1" travel are $5 to $10US around here.


Mike Ross



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