Cup for hydraulic post knocker

diggerjones

diggerjones

Well-known member
Now I've got a 2.7t digger that lifts the breaker up high enough to bang posts in, i was wondering about a jack hammer cup. Talking to someone today said you can get a cup made with a hole in top to take a worn out pecker pin.
 
Mick-the-fitter

Mick-the-fitter

It’s what I do!
You’ll need the cup and pin supplied as a pair, with a taper fit between the two.

Your mate might have assumed it was a worn out chisel but it’s actually precision engineering 🤣
We have 5 broken ones in the shed! Don’t normally make the whole contract with one!
 
V8Druid

V8Druid

do it as well as you can,but learn to do it better
You’ll need the cup and pin supplied as a pair, with a taper fit between the two.

Your mate might have assumed it was a worn out chisel but it’s actually precision engineering 🤣
any idea what the taper is? morse? K? or one of their own devising ?
 
Mick-the-fitter

Mick-the-fitter

It’s what I do!
how do you mean 'broken'?
They don’t bend very well, they are a tapered pin in a cup which if used(when used! ) off centre just breaks level with the cup top, we have tried welding to the part in the cup to pull it out, without any luck!
 
doobin

doobin

Well-known member
They don’t bend very well, they are a tapered pin in a cup which if used(when used! ) off centre just breaks level with the cup top, we have tried welding to the part in the cup to pull it out, without any luck!
I’d be sticking the cup in a lathe and then drilling a hole in the centre to get a hard drift through. Heat the stub up and twat it with a drift, nothing to loose.
 
Mick-the-fitter

Mick-the-fitter

It’s what I do!
I’d be sticking the cup in a lathe and then drilling a hole in the centre to get a hard drift through. Heat the stub up and twat it with a drift, nothing to loose.
What lathe🤨😊but yes that would work!
 
Canal Navvy

Canal Navvy

Well-known member
I wonder if the hydraulic ratio trick would work 🤔
Drill a hole down through the broken pin till you feel it break through into the cap, part fill hole with oil, close fitting pin in hole and whack with sledgehammer 🙂
 
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