Hole size with tolerance for Shaft

[moiz19670309]

I have a shaft with size dia 260.355
A Shaft sleeve fits over the shaft with rectangular key
The sleeve got damaged
Now we have to manufacture a new sleeve
I am confused what should be the sleeve ID with tolerance that I should give to my machinist. So that the sleeve easily fits on the shaft with locating key
Please help

 

[Jboggs]

You told us nothing about the application, the precision, the load, any maintenance issues, etc. Don't try to over engineer this thing. If your machinist is experienced, make sure he understands the situation and rely on his judgment. Young engineers can learn a lot from older, experienced machinists.

 

[3DDave]

In some equipment a few millionths of an inch (0.0000254mm) is sufficient clearance.

It depends on how round the shaft is and that information is not given here.

More clearance than is required to make up for size and shape variations in the mating part isn't usually helpful, but after that more clearance is required to make up for size and shape variations in the sleeve that you are making and those are often known best by, as Jboggs mentioned, machinists.

There are common fits and limits for use when neither part exists for the purpose of design, but you are missing half the specification, which is what the expectation was for the shaft. Also, the shaft has been in use and may no longer conform the the original specification.

 

[dvd]

Curious if you measured shaft diameter to .355 mm accuracy, or if this is a drawing dimension (260.355 mm is very close to 10.250 inches). You can find a reasonable fit based on DIN/ISO 286