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nuckolls.bob(at)aeroelect
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 Posted: Tue Oct 19, 2021 2:52 pm Post subject: Vacuum pad shear couplers |
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So the idea that a plastic shear coupling can
be 'overstressed' by some anomaly in field
excitation simply has no foundation in physics.
It is far more likely that material or a process
used to fabricate the coupling is deficient.
I found some exemplar shear couplers from a
vacuum pump pad. The two disks at each end
are engaged by pins on hard, drive parts.
The cylinder of plastic between the disks
is the shear section.
Being plastic, it is not a trivial matter to
craft a well calibrated part for shear strength.
B&C went through some iterations of materials
before settling on a production configuration.
I'm pretty confident that Plane Power is having
difficulty with their present batch of parts.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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rv8iator
Joined: 11 Apr 2006
Posts: 144
Location: Newberg, OR
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| Posted: Wed Oct 20, 2021 7:37 am Post subject: Vacuum pad shear couplers |
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Another response to accessory drive couplingshttps://www.kitplanes.com/disintegrated-drive-coupling/?utm_source=ActiveCampaign&utm_medium=email&utm_content=KITPLANES+Weekly&utm_campaign=KP+Weekly+2021%2F10%2F12
...chris
On Tue, Oct 19, 2021 at 3:56 PM Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
| Quote: | So the idea that a plastic shear coupling can
be 'overstressed' by some anomaly in field
excitation simply has no foundation in physics.
It is far more likely that material or a process
used to fabricate the coupling is deficient.
I found some exemplar shear couplers from a
vacuum pump pad. The two disks at each end
are engaged by pins on hard, drive parts.
The cylinder of plastic between the disks
is the shear section.
Being plastic, it is not a trivial matter to
craft a well calibrated part for shear strength.
B&C went through some iterations of materials
before settling on a production configuration.
I'm pretty confident that Plane Power is having
difficulty with their present batch of parts.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
|
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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_________________
C. Stone (RV8iator) |
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