wrote in message
...
On Apr 12, 7:07 pm, "Terry Coombs" wrote:
Almost finished with the part ... OK , what this part is , it's a sleeve
that goes on a motor that runs an oilless compressor . This sleeve needs
to
be press fit on the motor shaft as it transmits all the torque to the
crankpin . The crankpin has a taper that fits into a half-dovetail cut
into
the sleeve , as the nut is tightened the dovetail locks the crankpin to
the
sleeve/shaft .
I currently have it machined for a .0015 interference fit ~ .700" shaft
diameter. The outside has to be a hand-press fit into a roller bearing
and
the crank plate that mates the shaft to the crankpin . NOW , the question
is
how much is this sleeve going to grow when we press it on ? Do I allow for
that much growth , or less ? Once installed on the motor shaft it's going
to
be difficult to turn it down if I get it wrong ... and right now I have
exactly the fit I want in the bearing .This would sure be easier if there
were holes for centers drilled into the shaft
--
Snag
My gut tells me to take the OD
down that thou-and-a-half ...

My gut says it depends on the thickness of the sleeve. A thin sleeve
will stretch . A thick sleeve will not expand as much. But can you
not turn the motor on and use some abrasive to take a little off of
the sleeve diameter?


Dan

Ah , would that it were that simple !! The bearing it must fit is the
front bearing of the motor ... As PM said , bad design . I'm going to shave
a thou off the outside , it's more important it have a good grip on the
motor shaft than it fit tightly in the bearing .
--
Snag