Standard for keys and keyways/keyseats design (Aircraft)

[Helepolis]

Hi all,

Is there an accepted standard (e.g. MIL, MS etc.) for designing keys and keyways/keyseats for aircraft components?
I need for designing a rectangular key with one end rounded.
Not sure if its relevant but the key material has to be stainless steel.

Google and various LLM's didn't help too much, the closest answer I got was that there isn't any particular standard for keys and ASME B17.1 is acceptable.
So I want to double check.

Thanks,
SD

 

[dcascap]

Maybe move this post to Aircraft Engineering as they could help you more with it.

From my side I'm not aware from a MIL spec for it but I'm not experienced on this.
I guess a simple requirement is to use aerospace graded stainless steel (MMPDS) to avoid issues.

Regards,
DCC

 

[MintJulep]

There's a list of specs in this thread.

KEYWAY SPECIFICATIONS - Machines & Machining engineering

Can anyone provide standard keyway specifications for documation purposes? Inch sizes are most importain at this time. I am looking for a basic formular, unlike the information in the machinist handbook. Thank You

www.eng-tips.com

Someone will soon explain why keys and keyways are evil....

 

[Helepolis]

Maybe move this post to Aircraft Engineering as they could help you more with it.

The traffic on that forum is practically dead compared to this one, so I figured bigger traffic beats a specialized forum.

Someone will soon explain why keys and keyways are evil....

Why is that?
It's the first time I hear something negative against.
If they are evil, what are the "better" alternatives?

 

[MintJulep]

effect of keyways on hubs - Mechanical engineering general discussion

I think everyone is familiar with the U of Illinois paper The Effect of Keyways on the strength of Shafts (Herbert Moore 1904) but does anyone know of a similar study on the effect of keyways on the hubs?

www.eng-tips.com

Shaft keys revisited

Dimensions of shaft keys, standardized many years ago, are commonly considered to be the main concern in applying these devices. However, designers tend to forget that other important...

www.machinedesign.com

 

[rb1957]

but don't double post. "report" one thread and ask for it to be deleted.

the traffic volume on the aircraft forum may be small, but I think there's quality in the replies ...
and it is only natural ... "airplanes" are a much smaller market than "mechanical eng'g".

 

[CWB1]

Keyways are great for quick, cheap, but not particularly precise alignment and are downright lousy for transmitting torque. If you need to transmit any significant amount of torque you're usually better with a spline, taper, or bolted/clamped faces.

 

[rb1957]

shows how little I know about keyways ...

 

[EdStainless]

I used a lot of keyways where alignment was not critical, the loads were low, and failure didn't destroy the device.
Otherwise it was splines.