Gunco Forums banner

Poor man's pin buster

10K views 20 replies 17 participants last post by  wpage 
#1 ·
Here's the score so far, Max's pin buster 8, Romy pins 0

Some of these Romy's are real bears to get out, I've read a lot of horror stories lately, with lots of folks having to resort to heat and/or drilling to pop these thing loose.

I think the major problem is getting the trunnion to remain flat and fully supported while pressing.

The pin area of the trunnion is relieved half way around by .118 and the remaining area of the trunnion is .040 low once the receiver stub is removed.
This leaves precious little flat surface to work with.

I found a 1/2" SAE washer .118 thick, and cut off 1/4 of it.
This fills the missing area around the pin perfectly.

I then took one side of a receiver stub and welded both pieces to a piece of 3/8 steel plate, drilling a hole for the pin to come through.

The upper rail engages the trunnion and locates it properly.

Between the washer and receiver stub, the trunnion is 100% supported and the pin remains perfectly perpendicular to the press.

Now the only rock and roll I have is on the radio
 

Attachments

See less See more
3
#2 ·
Here is the other half of the equation.

I took a piece of 1-1/2" black iron pipe welded a steel plate to one end.
Then I took a 9/16" lag bolt and cut off the shank section, rifle drilled it and welded it to the steel plate.

I bought some 15/64" hardened drill rod, cut a short piece for busting them loose, then a longer piece to push it out.

I drilled and tapped two holes for set screws.
One holds the drill rod in, the other secures the pipe to the ram of the press.
 

Attachments

#7 ·
Vulcan,

I have one like that also, one of Plinker's.

I have used it on many builds with good success on most builds.
On some really tough ones, like a few of the AMD65's and a lot of these Romys, I had some trouble with the trunnion trying to roll.

No matter how well the rest is supported, the pin hole area it's self is still only supported on two sides.
The cut up washer is the key. I would use it even with your aluminum block
 
#14 ·
From what little German I know, the original quote from Nietsche really translates as "That which does not kill you, defines you." Not "makes you stronger."
 
#17 ·
I have a ghetto version that I made, and it works great.
 
#19 ·
Just for a suggestion,, a bit of 2 sided tape to hold the cut washer in place will take some of the $#@#$^%&*(*&(*)&%^$# outa keeping it in place till the press bears tight. Had some Volvo Penta castings from an outdrive that had a simular shape as a trunnion does and had to use the identical method for that. 2 sided tape is your friend!!!!
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top