Mystery Part
Mystery Part
(OP)
Alright, so I've had this thing for years, and I have no idea what it really is. I was hoping someone here might recognize it.
It's fairly heavy, and based on surface finish my best guess is that it's a stainless steel. I have some recollection of someone saying it was a propeller hub for a large R/C plane, but I can't find anything that looks like it. It is about 80mm tall, and the ring on top has a fairly nice surface finish to it (a bearing surface of some sort?)
(Let me know if I've thrown this in the wrong forum)
Picture
Thanks!
It's fairly heavy, and based on surface finish my best guess is that it's a stainless steel. I have some recollection of someone saying it was a propeller hub for a large R/C plane, but I can't find anything that looks like it. It is about 80mm tall, and the ring on top has a fairly nice surface finish to it (a bearing surface of some sort?)
(Let me know if I've thrown this in the wrong forum)
Picture
Thanks!





RE: Mystery Part
Cheers
Greg Locock
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RE: Mystery Part
RE: Mystery Part
The external thread profile suggests that it's a really short ballscrew.
The cross-bore seems made to accept a precision pin like a crankpin.
The generous radii between the thread on the pinbore suggest that the part is subject to substantial tensile loads and lots of load cycles.
The pointy feature on the left end looks like the sort of self-centering feature you'd find inside a double Cardan joint.
Lacking any knowledge whatsoever of how such devices are actually made, I'm guessing it's part of the hub/blade root assembly for a variable pitch propeller.
Mike Halloran
Pembroke Pines, FL, USA
RE: Mystery Part
I do agree it's odd that they are formed in a helical geometry but a similar feature is used for sealing in low-cost devices. This, admittedly, does not look like a low-cost part.
RE: Mystery Part
I'd imagine that it sits inside a pancake stepper motor and is connected to a piston or lever or crank arm.
RE: Mystery Part
RE: Mystery Part
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
Good engineering starts with a Grainger Catalog.
RE: Mystery Part