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 Post subject: Driving pin removal
PostPosted: Mon Jul 15, 2019 7:53 am 

Joined: Thu Apr 14, 2005 9:34 pm
Posts: 2395
Location: Copenhagen, Denmark
Anyone feel like posting some stories or pictures of driving pin removal? We have been a little challenged in this area recently.

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Steven Harrod
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Danmarks Tekniske Universitet


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 Post subject: Re: Driving pin removal
PostPosted: Mon Jul 15, 2019 9:13 am 

Joined: Wed Jan 28, 2009 4:30 pm
Posts: 172
Please define "driving pin". Are you referring to the crank pin in the driving center?


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 Post subject: Re: Driving pin removal
PostPosted: Mon Jul 15, 2019 9:32 am 

Joined: Tue Sep 14, 2004 7:52 am
Posts: 1865
Location: Strasburg, PA
Here's one way.
Attachment:
UP castings for extracting crank pins.jpg
UP castings for extracting crank pins.jpg [ 150.29 KiB | Viewed 2647 times ]



Attachment:
UP extracting.jpg
UP extracting.jpg [ 150.09 KiB | Viewed 2647 times ]

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"It was not easy to convince Allnutt. All his shop training had given him a profound prejudice against inexact work, experimental work, hit-or-miss work."
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Strasburg Rail Road Mechanical Department


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 Post subject: Re: Driving pin removal
PostPosted: Mon Jul 15, 2019 9:47 am 

Joined: Sun Aug 22, 2004 7:19 am
Posts: 5836
Location: southeastern USA
Unless you have large presses and equipment to true up the hole afterward, your best bet may be to burn off the protruding end of the pin, core it out with the torch, gradually open it out towards the perimeter until you can crush it inwards with a hammer and punch and remove it without damaging the bore in the wheel center.

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 Post subject: Re: Driving pin removal
PostPosted: Mon Jul 15, 2019 10:13 am 

Joined: Tue Sep 14, 2004 7:52 am
Posts: 1865
Location: Strasburg, PA
Yep, that works. An old Reading RR machinist told me that they had to replace a crankpin in the roundhouse while in place on the locomotive. They cut the old CP out with the torch.

They also didn't have a press to put the replacement in with. Their solution? They made a thick brass cap to cover the end of the crankpin, hung an old driving axle from the rafters, and hammered the new crankpin into the driving wheel like a nail into a plank.

There's a lot to be said for dry ice.

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"It was not easy to convince Allnutt. All his shop training had given him a profound prejudice against inexact work, experimental work, hit-or-miss work."
C. S. Forester

Strasburg Rail Road Mechanical Department


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 Post subject: Re: Driving pin removal
PostPosted: Mon Jul 15, 2019 10:28 am 

Joined: Thu Apr 14, 2005 9:34 pm
Posts: 2395
Location: Copenhagen, Denmark
CCDW wrote:
Please define "driving pin". Are you referring to the crank pin in the driving center?


Yes - sorry it is the literal Danish translation.

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Steven Harrod
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Danmarks Tekniske Universitet


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 Post subject: Re: Driving pin removal
PostPosted: Mon Jul 15, 2019 12:34 pm 

Joined: Wed Jan 28, 2009 4:30 pm
Posts: 172
We set up a porta-power, rods, bars, and sundry and pushed each one out


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 Post subject: Re: Driving pin removal
PostPosted: Sun Jan 05, 2020 11:15 am 

Joined: Fri Dec 27, 2019 5:57 pm
Posts: 29
Claude Camp MM from the Texas and Pacific told me years ago to burn them out with a torch and hit them with a sledge; we used a a Mag-Drill then a sledge!


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 Post subject: Re: Driving pin removal
PostPosted: Sun Jan 05, 2020 2:57 pm 

Joined: Mon Aug 23, 2004 5:10 pm
Posts: 1066
The WW&F in Maine has a portable crank pin press. It was donated by a member and is reported to have come from the D&H. It includes large clevis that would be fitted behind the spokes on the wheel so the press has something to bear against. It has not been tried under load, but it has been operated.


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