Bearing removal

[fried1765]

So I did just that today, and was told to hold off. They will try to procure new bearings, which causes the engineers and procurement folks major headaches.
I have already modified a bearing separator to get behind the outer race of the bearing. They told me hold off just as I finished. grrrrrr

If they cant get me new bearings, I will put the whole thing, puller and all in the oven and warm it up and put a little tension on the puller/separator. The shaft is hollow under the splined area, so I will use liquid N2 to freeze the shaft and hopefully it will let go and move enough that I can make a set of collets that can get behind the inner race and pull it the rest of the way off.

My son knows the FAA administrator.
I'll ask my son to ask him to give you a call. :laughing:

 

[user.69169]

I suggest youthink of Nitrogen only as last resort yer life depends on. Temperature so cold it does nasty things to metal. Co2 pretty safe and usually sufficient to get shrink you need.

Oven idea is bad too- you said you got induction unit. It can concentrate heat on bearing where you need heat. Might provide enough heat to move bearing if whole assembly frozen in freezer. Heavy head end will retain lot of cold while you induction bearing.

Hollow shaft??? Hollow all the way thru or hollow part way? Might be better chill by shooting Co2 shaft.

 

[the old grind]

Agree strongly with all (removed) said above. I'd also leave N2 for expendable(?) parts, use CO2 if anything, and spray working from the long end if the hollow is blind.

I doubt that induction would heat the inner race enough w/o risking bad things happening to bearings and/or seals. See here from :25 or so. At :50 (pic below) see where the back of the separator has an area that could be flat ground a bit to sharpen the lips, & how blunt they are on that side. The tapered sides opposite might be touched up with a die grinder, polished, etc.

Two minute video here. Start at :25 or so. At 1:10 there should be something for the screw to push on & not bung up the end of the shaft.

How To Use A Bearing Separator - YouTube

Thanks to Supercheap Auto for this pic:

 

[denchen]

Its just an idea, and I`m no aero engineer, but what about putting a slim knife in a vice, blade up. Hold the gap between the bearing and the machined part on the sharp of the blade. Then take another knife, hold it over the opposite side gap, and gentle tap with a small hammer. If it opens a little, then thicker knives, until the feet of a puller will go in.