What type of keyway is this?
What type of keyway is this?
(OP)
Guys,
I'm having a hard time identifying the type of keyway featured on this shaft. The mating hub is machined "opposite" of the shaft to accept a tapered rectangular key. I need to supply a new key for the piece of equipment but do not have an old key that I can measure nor can I find a specification that matches this particular style. I checked through various editions of the Machinery's Handbook with no luck. I thought it might be a Kennedy double key or a Peter's double key but the dimensions do not follow the standard. I'm starting to think that it's a custom design that doesn't necessarily follow a spec. Any and all help is greatly appreciated!
I'm having a hard time identifying the type of keyway featured on this shaft. The mating hub is machined "opposite" of the shaft to accept a tapered rectangular key. I need to supply a new key for the piece of equipment but do not have an old key that I can measure nor can I find a specification that matches this particular style. I checked through various editions of the Machinery's Handbook with no luck. I thought it might be a Kennedy double key or a Peter's double key but the dimensions do not follow the standard. I'm starting to think that it's a custom design that doesn't necessarily follow a spec. Any and all help is greatly appreciated!





RE: What type of keyway is this?
Some people call it a "tangent key"...apparently often used in pairs on really big shafting. Each key is strong in one direction. Some google searching might turn up some specs for "tangent keys". I hope that helps.
RE: What type of keyway is this?
RE: What type of keyway is this?
Metric...and poor resolution...but maybe it's a start.
RE: What type of keyway is this?
DIN 268
DIN 271
ISO 3117
IS 2291 (Indian Standard I was able to find, claims equivalence to ISO 3117, see attached)
Probably all metric, though.
RE: What type of keyway is this?
It's more than 55 years since I last hand made and fitted a tapered key, however, think I could still measure and rough out a key before smoko and for the size involved probably have it fitted and finished first thing after lunch.
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: What type of keyway is this?
I just want to verify the recommended tolerances and dimensions. I know that it will be a 1/100 taper but as far as width fit tolerances and height tolerances I'm still lost. I've got the key information for the coupling in the system so I can use that as a reference. What's throwing me off is that the key seat for the shaft and the hub aren't nominal imperial or metric dimensions which isn't typical of most keyways. I don't have the ability to measure the existing keys since the current system is still in operation. The keys will likely need some field fitting but I'd like to get the key manufactured as close fitting as possible. Field work will be very difficult to perform in this circumstance.
RE: What type of keyway is this?
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: What type of keyway is this?
RE: What type of keyway is this?
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: What type of keyway is this?
Because it is a tangent key, the height is more critical that the width (which is mitigated by the taper). It is actually a real nice design, especially for large lower speed shafts.
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