Author: Eric Chauvin <echauvin@...> Time: Thu Aug 14, 2003 3:32 am PDT Link
Hello there,
I'm at the point in the project where I'm starting to install the flap
actuator in the fuselage. The thing that has me baffled is how is the
motor supposed to work? When I attach a 12V power supply to the leads
the shaft spins around but doesn't extend or contract. When I reverse
the connections to the wires it will spin in the opposite direction but
still won't move in or out. When I turn the shaft by hand, however, it
does thread its way in and out. I'm I doing something wrong here or is
the unit inop? Even if the shaft did move in and out the way I assume
it is supposed to, should it spin? Wouldn't the spinning motion act
against the bolt attached to the bottom of the shaft?
Eric Chauvin
RV-9A fuselage
Author: "Sam Benjamin" <sambenjamin@...> Time: Thu Aug 14, 2003 5:28 am PDT Link
Eric,
Whe the actuator is installed the shaft can't turn, if you hold the shaft it
will move in and out. It has a screw jack inside that has a ball bearing
running in the grove, when it reaches it's limits the bearing runs off the
end of the screw jack, this allows the motor to continue to run with no load
on it. When the motor is reversed the screw jack picks up the ball and runs
to the other end, where it again runs off the end allowing the motor to
continue running with no load.
Sam Benjamin (N989RV)
-------Original Message-------
From: RV-9A@yahoogroups.com
Date: Thursday, August 14, 2003 06:31:26
To: RV-9A@yahoogroups.com
Subject: [RV-9A] Re: flap actuator
Hello there,
I'm at the point in the project where I'm starting to install the flap
actuator in the fuselage. The thing that has me baffled is how is the
motor supposed to work? When I attach a 12V power supply to the leads
the shaft spins around but doesn't extend or contract. When I reverse
the connections to the wires it will spin in the opposite direction but
still won't move in or out. When I turn the shaft by hand, however, it
does thread its way in and out. I'm I doing something wrong here or is
the unit inop? Even if the shaft did move in and out the way I assume
it is supposed to, should it spin? Wouldn't the spinning motion act
against the bolt attached to the bottom of the shaft?
Eric Chauvin
RV-9A fuselage
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Author: Eric Chauvin <echauvin@...> Time: Thu Aug 14, 2003 9:16 am PDT Link
Hi Sam,
Thump! (the sound of my hand slapping my forehead) Of Course! Thank
you for that. I feel kinda stupid for not trying that already. I
figured that there must be some kind of worm screw inside the shaft but
I thought that there would also have been some kind of pin that would
move up and down a slot in the sleeve to keep the shaft from spinning.
With a load on the shaft that, of course, isn't necessary. Elegantly
simple design.
Thanks again.
-eric
RV-9A fuselage
On Thursday, August 14, 2003, at 04:05 AM, Sam Benjamin wrote:
> Eric,
> Whe the actuator is installed the shaft can't turn, if you hold the
> shaft it
> will move in and out. It has a screw jack inside that has a ball
> bearing
> running in the grove, when it reaches it's limits the bearing runs off
> the
> end of the screw jack, this allows the motor to continue to run with
> no load
> on it. When the motor is reversed the screw jack picks up the ball and
> runs
> to the other end, where it again runs off the end allowing the motor to
> continue running with no load.
> Sam Benjamin (N989RV)
> -------Original Message-------
>
> From: RV-9A@yahoogroups.com
> Date: Thursday, August 14, 2003 06:31:26
> To: RV-9A@yahoogroups.com
> Subject: [RV-9A] Re: flap actuator
> Hello there,
>
> I'm at the point in the project where I'm starting to install the flap
> actuator in the fuselage. The thing that has me baffled is how is the
> motor supposed to work? When I attach a 12V power supply to the leads
> the shaft spins around but doesn't extend or contract. When I reverse
> the connections to the wires it will spin in the opposite direction but
> still won't move in or out. When I turn the shaft by hand, however, it
> does thread its way in and out. I'm I doing something wrong here or is
> the unit inop? Even if the shaft did move in and out the way I assume
> it is supposed to, should it spin? Wouldn't the spinning motion act
> against the bolt attached to the bottom of the shaft?
>
> Eric Chauvin
> RV-9A fuselage
> Yahoo! Groups Sponsor
> ADVERTISEMENT
> To unsubscribe from this group, send an email to:
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> [Non-text portions of this message have been removed]
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