Not that we have finished running the parts on the machining centers it is time to do the final fit up. Using the 1018 trunions that we made a hole was drilled in it to allow alignment with the button pressed into the receiver. Then the blocks were tested to see if the fit up […]
With these last three operations we will have completed the work on the cnc machining center.
You can see the process of rough machining the bottom of the curve for the trunion. This op also machined the complete magazine well out.
A good side view of the rough machining of the curve.
All the […]
It has been a while for a MP-44 trunion update. The next couple of posts will get us back up to date with the trunion project.
The new op 5 was to cut a slot and rough magazine opening to allow coolant flow and chip removal and still allow us to high speed machine.
In this post we are going to look at how the badly cut up and rusted lower portion of the MP-44 receiver was repaired. You can see in the first photo the condition of the under side of the lower front portion of the receiver.
The first set was to cut out the bad section.
With this post I am going over a few of the problems that have occurred during the machining of op5 on the 4140 hardened trunions. We ran into a snag while doing this op. A problem that did not occur on the 1018 steel parts.
A quick video discussing the problem and solution.
The welding on the lower receiver is now complete. This is the video on that update.
Now for some pictures showing close ups of the work performed.
A side view of the lower receiver
A top view of the receiver
The rear stock supports is first spot welded in place. However, due to […]
We have started on Pete’s, a friend of gun lab, new 4140 MP-44 trunions. This series of videos and posts is the process we used to make them.
First the video.
Here are the pictures going over the changes and the steps we took.
We needed to change the depth of cut for […]
I happen to own a Hotchkiss portative light machine gun. Now that I have it working, with the help of my friend John, I find it one of the more fun guns to shoot.
So since last December I have been working on a couple of accessories for it. Well it happen that on […]