Material Thickness around Keyway in Hub
Material Thickness around Keyway in Hub
(OP)
Hi All,
I'm trying to design a hub made of mild steel that will accept up to a 1-3/4" in shaft with a 1/2" Key.
I can't seem to find a standard for the material thickness (corner of key to O.D. of hub for example) around the key and it's been awhile since I've done this type of calculation to figure it out. I figured there must be some type of general rule out there that I haven't come across yet.
Thanks for your help.
I'm trying to design a hub made of mild steel that will accept up to a 1-3/4" in shaft with a 1/2" Key.
I can't seem to find a standard for the material thickness (corner of key to O.D. of hub for example) around the key and it's been awhile since I've done this type of calculation to figure it out. I figured there must be some type of general rule out there that I haven't come across yet.
Thanks for your help.





RE: Material Thickness around Keyway in Hub
To analyze stresses in keyways and keys, read MF Spotts "Design of Machine Elements"
RE: Material Thickness around Keyway in Hub
I haven't seen anything that relates the hub wall thickness to keyway size, however when designing the keyway and key the stresses you calculate are based on the shear and bearing stress for the given dimensions and normally the key size is based on the shaft diameter as a starting point.
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desertfox
RE: Material Thickness around Keyway in Hub
How much torque are you transmitting?
For me a starting (and maybe a finishing) point is how big a bore FALK would punch in one of their nice steel gear couplng hubs.
http://www.delzer.com/rexnord/451110.pdf
The smallest size is a 1010G. They'd bore the hub for a 1.875 inch shaft. Not that far from 1-3/4 inch in my book. Looks like the hub is 2.7 inch diameter. page 16.
Note their standard fit is a slight interference. Setscrews and keys can't be counted on to resist micromotions, fretting and wear by themselves if there's an appreciable side load or uneven torque.
RE: Material Thickness around Keyway in Hub
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RE: Material Thickness around Keyway in Hub
You've had some highly qualified experienced responses (DesertFox, Uncle Syd, et al) point you in the right direction and website links. All I would add to this is probably FEA and base the output to your hand computations to validate the model.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: Material Thickness around Keyway in Hub
FALK has different maximum bore limits based on key profile. If I need to bore a particular hub for a larger shaft, using a low profile key can help me do it.