|Forum topic by bluekingfisher||posted 10-27-2013 09:05 PM||670 views||0 times favorited||11 replies|
10-27-2013 09:05 PM
A few days ago I posted a question regards a restriction on the adjustment mechanism of my 23g headless pin gun. Despite having lots of offers of support and good luck, no one it seemed had had such a problem or at least been able to offer specific advice on how to go about solving the problem.
With this in mind I thought why not strip it down and have a look, hopefully the cause will be obvious and a quick repair can be made. I was hoping a pin or part of one would fall out and the job would be done.
All in all it was a fairly straight forward job, the main issue was the size of the gun and the working parts which are of course very small and fiddley
You can see the slide with the back and forth arrows, movement either way either raises or lowers the internal spring (more on that later). Taking the gun apart was straightforward, well almost. It was just a case of removing cotter pins which were secured by small rubber o rings or small machine bolts with nuts or tapped into the body of the gun.
The magazine housing removed from the main body of the gun.
This was the only problem I encountered, when I removed the pin adjustment slide from the magazine housing there is, and at this time unknown to me, a tiny spring and ball bearing which facilitate the smooth travel of the adjuster over the body. When I removed it by sliding it off the mag body the spring hit me on the nose and the ball bearing hit the ceiling of the shop like a bullet then rebounded onto the bench then rattled off somewhere behind my bench into a pile of dust and timber. I immediately thought that is the end of that ball bearing and a new part would need to be ordered. Fortunately, after getting down on my hands and knees behind the bench I found it, unbelievable as it was tiny
The guide which allows for the different sized pins is a piece of stamped spring steel with a couple of diagonal slots milled into it. These slots line up with the cotter pins which hold the adjuster slide onto the body so when the guide is slid back and forth the cotter pins ride in the diagonal slots which raises or lowers the track which accept the pins.
The problem is, iti is stamped from a sheet of spring steel about 1mm thick. Being stamped, the edges were rough in places and had burrs and sharp corners. The slots themselves were a little rough. In addition, the pin track is so minuscule that there is no room for slop or play. The burrs and sharp edges prevented the guide from sliding up and down smoothly. So, the solution was to get out the needle files and smooth off all the rough edges and level the high spots.
A little trial and error ensured the guide would slide quite easily within the track and body of the magazine.
Once I was happy it was a case or re assembling the gun and hope the adjuster would travel the full length of the range to fire the one inch pins.
With the one inch pins loaded would the magazine close and allow the gun to fire?
Yep, the magazine slide closed over the pins OK but would it fire. I connected it to the air line and crossed my fingers, then fired. RESULT…......it worked.
The one inch pins protruding from the 10mm stick of mahogany, and a nice little hair brush it made!
I tried all the other pins in the range and they all fire too so an hour and a halfs work made the repair. As always, once the job has been done once subsequent repairs if required could be done in a fraction of the time.
I hope this small job will come in useful for others who may encounter similar problems with their headless pinner.
As always, a big thanks to SWMBO for her photographic.
Thanks for taking the time to read.
-- No one plans to fail, they just, just fail to plan