"Gunner" wrote in message
...
On Sun, 14 May 2006 09:03:53 -0700, JR North
wrote:

Noth'n like a good, hard hitting air hammer and some carefully ground
drifts to drive stuff like that off. Typical US manufactured
****....(the fan).
The hammers work amazingly well; even holding the parts in your hand,
the blows are so fast the inertia of the work stabilizes it. Heat the
hub and drive the shaft out. have at it.
JR
Dweller in the cellar


Humm...I do have a air hammer (rivet gun)...Ill try that this morning.
Its been sitting steeped in Kroil all night. Thanks for the idea!

Gunner

Gunner wrote:

A year or so ago I scrounged one of those big 4' shop fans that stand
up on a pedestal and blow huge amounts of air around the shop. Didn't
have the stand, the switch was broken and the bearings sounded like a
coffee can full of rocks..but it blew air well enough. Summer is again
upon me..its been 90F for the last week or two..so its time to fix er
up. Two 5/32 setscrews hold the fan blade to the shaft, so they got
to bet loosened to take the blade off.

Serious tugging with a basic good quality allen wrench..no movement.
Apply Kroil in copious quanties..let sit, use small pipe as snipe on
allen wrench..tap several times..give her a pull..and round out the
setscrew instantly..Frack..

Take out 3/8" socket with 5/32 allen..add small breaker bar to second
allen, tug..and shear allen off inside the setscrew....FRACK!

Blades are in the way as is the back cage. So cage has to go. solid
weldment..so taking out trusty air cut off wheel, I slit the cage to
pull out around the motor shaft..blades in the way...****..cut away
entire section. and remove the cage, will tig it back together later.

No amount of poking, prodding, thumping coaxing or praying will get
that busted allen stub out. So drill a series of holes around the
allen, then use a 2 flute end mill in a hand drill to cut enough
material away so the setscrew and allen fall out.

Fan too big and too close to coupler to use milling machine..so must
do with drill motor.

Drill out other rounded setscrew.

Take fan and motor to hydraulic press to press shaft out of fan
assembly. Discover fan assembly too big to go in press...damn..

Rig up chunks of I beam, hang motor from fan coupler with a couple
pieces of 3/4" flat stock across I beams. Soak well in Kroil. turn
heavy brass drive to under shaft size and using a 2 lb shop hammer,
attempt to drift shaft out of fan. Repeatedly..more kroil..more
beating..more kroil...nada..no movement, nothing.

fan attachment is too wide for a gear puller to work and too flimsy.

Get out rosebud and OA torch. Head couple till dull red, use brass
drive and 2 lb hammer. Repeatedly. More fire, more beating, more fire,
more beating...nada. Fan will not move in either direction.

Let cool. Use Kroil. Use hammer and drift. Repeatedly. Nasa.

Stand there incredulously. Go in house and log on to usenet. Maybe the
good faries will remove it for me while Im sleeping.

Sure they will. Ayup. Oh for sure dude.

Sigh...

All I wanted to do was change the bearings, damnit

Gunner
50 ton press and proper punch should get it out. When you do you might be
able to tell if it was a right or left hand thread. ;-)
Tom