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  #1  
Old 01-05-13, 08:18
Andrew Rowe Andrew Rowe is offline
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Default Pin Extraction

I think this is going be the standard answer from most people.
It looks like a very difficult pin to extract.
I think if the arm is seized most people will just heat and leave it there.
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  #2  
Old 01-05-13, 12:13
drcowie drcowie is offline
Des
 
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Default Extracting Pin

Hi Andrew

Yes, the pin is fully threaded (for what ever reason!)

Here are 2 options - drill out pin with a series of holes (on radial drill) or slot housing with a grinder, it will spring out to allow the removal, then prepare & butt weld joint.

Regards Des
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Old 02-05-13, 10:50
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colin jones colin jones is offline
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Hi Andrew, after having a look at mine, I can't see why you couldn't make a clamp devise for portapower, apply heat and press it out. Just a thought of course. I think that is what I will do or at least try when I get to that stage.
Colin.
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  #4  
Old 02-05-13, 20:00
Andrew Rowe Andrew Rowe is offline
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Default Pin Extraction

Hi Colin, Des is right. The pin is fully threaded.You cannot press it out. It needs to unscrewed out. I don't know if you could set up to opposing portapowers with a key that locks into the groove and then apply heat to get it to turn.I have just finished boring one out with a 70mm drill and then gas cutting the remaining pin to collapse it onto itself, so it can fall out the hole.Then of couse you just need to machine new pin that will fit in smooth.
Even thinking of making a tap to clean thread, haven't checked dia. and TPI yet ,but its about 3 inch dia.
I cannot understand the reason why this was not just a pin and bush, Maybe there is somebody out there that can enlighten me on the reason why they have chosen to screw a pin into a housing like this??
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