In there solid

[Hitch]

A couple of the lads have been on a site job, they bought back a piece of it, a 5' diameter fan, from the rear of an incinerator. It had to be removed, but it wasnt shifting.... so they gassed the shaft

Been soaking in wd for a few days... tried beating it out with a drift and sledge...broken handle... none of it

Press brake, barely enough daylight to get it in there any sense..

Heat the boss, and beat it...

Welded rsj across the fan body, and portapack it....

Weld a bit of solid across the end of the shaft, then a wedge from each side

Find someone with a substantial H frame press, no joy

Okay, only option left that i could see... strip the pressbrake, get it in there with some 10mm packers underneath, press it 10mm out, then cut it off, press it, cut it...

The initial breaking of it the gauge went up to about 150tons
Still, every 10mm or so is still taking 80+ tons.


Me sledge hammer didnt really have a chance


Any tricks to getting stuck fast keywayed shafts out?

I think working in constant heat had frozen it well in there

 

[malcolm]

opps, we buried your thread there. Hopefully this will help.

Don't know. Freeze the inside and heat the outside would be my thought if that's possible. No point heating everything as everything will expand as much as everything else so no advantage. Can't have welded together - otherwise everything else would have melted.

Sounds like brute force is working. Sounds like the sort of thing there that's the sensible option.

 

[Welderpaul]

The last time we had a similar thing; the shaft had been gassed flush either side of the wheel. we couldnt beat it out. Shaft was 250mm long and 150 dia. Just used oxy to slowly burn out the stub of the shaft from the middle working outwards. When half the shaft had gone, and was glowing bright red, used a 3" dia drift and sledge to beat out what was left.
Sort of eroded it away from the middle. Height of summer as well it was!

 

[Hitch]

The shaft is about 80mm diameter, and stuck in about 200mm

It was suggested to drill a hole in the shaft and poor liquid nitrogen into it... to which i replied.... 'Okay, you go and find some, and ill drill the hole'

 

[Hitch]

I was going to drill it out, then blow the side with the gas

 

[malcolm]

It was suggested to drill a hole in the shaft and poor liquid nitrogen into it... to which i replied.... 'Okay, you go and find some, and ill drill the hole'

Guess the poor sod didn't have a company credit card - you can the stuff easy enough from BOC, and it's more than cold enough. Oddly enough you can pour it like water - we used to use it for the old fashioned thermal imaging cameras. Got to be careful not to stick your fingers in it though.

I've been known to use my own money just to prove a point.

 

[Welderpaul]

Don't forget the pictures tomoro hitch....
If you have your camera out, can you take a picture of the punch holder on the Geka? Wanna check something on one up for sale - think it might be a bodge - but then again?!

 

[Hitch]

Ours is a bodge paul, the original geka bit is crap... we machined our own strengthener block


Is it dear then Malcolm?

 

[Drains]

Are you trying to retrieve the impeller Hitch? Or what? Which bits are worth saving? Oh, also, who made it, out of interest?

I can only suggest sheds of heat into the boss, then continue as you have been. Make sure you're working it towards the key though (it's a taper key?)

 

[Hitch]

Wont have time for pics im afraid, its loaded up ready to go tommorow at 7

 

[Welderpaul]

Are you trying to retrieve the impeller Hitch? Or what? Which bits are worth saving? Oh, also, who made it, out of interest?

I can only suggest sheds of heat into the boss, then continue as you have been. Make sure you're working it towards the key though (it's a taper key?)

Confused now - Simon / Chloe?

 

[Hitch]

The fan body is the good bit, shaft is being relaced.
Cant afford to unbalance it, bloody 8mm palte it is

 

[Drains]

Confused now - Simon / Chloe?

Ah... sorry, yes, it's me. She's been sent away

 

[Hitch]

Im not sure who id rather talk about my shaft with....

 

[malcolm]

Is it dear then Malcolm?

No worse than their other stuff I wouldn't expect - though you'll need to take a thermos flask

 

[Drains]

The fan body is the good bit, shaft is being relaced.
Cant afford to unbalance it, bloody 8mm palte it is

I wouldn't assume the impeller will still be balanced anyway, and they're not so difficult to rebalance - just needs a marker pen, a steady hand, and some guts .
Cold on the shaft, hot on the boss, and the press...

 

[snowcat]

This sounds like the stuff I have to endure from the construction boys,

First method I normaly use is attack it with the rustoff ice(a kinda freezing compound) come WD40....
Then put it in the workshop press (100ton) normaly make a drift up exacly shaft size pump up as much as I dare, then heat, Hit the side then hit blows onto the drift, If it sudenly clicks good, If not repeat and apply WD parafin or diesel between cycles, often the heating and the cooling will start to free it, I sometimes resort to fast cooling with water as this might make the joint crack,

When we do the pins on the tracks on the dozzers theres no way of pressing them, So we dont bugger any more there about 6"x2" we burn all the way down them wit the gas nice big nozzle, propanes better as you dont overheat the nozzle as quick, working from the side just keep forceing the slag out, sometimes we get away with just taking the side or half the pin out but often the whole lot is burnt back...

The keyways the place to get hot first tho, as thats where the buggers always grab... your unlikly to get it to shift with just by beating it, normaly you just cant get the work solid, much better to get in a press pump the pounds up then hit and heat, anouther trick is to poor oil on it when its red hot, it somtimes pens between the shaft and boss..but watch your eyebrows

 

[Hitch]

We have the tonnage to push it, just not the height.
A pressbrake isnt really designed for this sort of thing!

 

[snowcat]

We have the tonnage to push it, just not the height.
A pressbrake isnt really designed for this sort of thing!

How about knocking up an H frame to hold a bottle jack quickly???

 

[steve202]

Boiling water works a treat on car ball joints, they almost fall out themselves then Have to get it right though, only long enough to heat the outside.

Not much help am I. Sorry!