These are the noted problems.
The first one is [...]]]>
These are the noted problems.
The first one is a very slight radius issue on the rear of the receiver just prior to the buffer tube
The second issue concerns the magazine release lever. this needs to be cut deeper to allow proper fit.
The third issue deals with the hole for the selector. There is a slight inset in the receiver to all the selector to set properly and this needs to be cut in. This is how it looks on the original.
And you can see it is missing on my test receiver.
The last issue is raised portion of the receiver around the magazine release. On my receiver it extends to far over and does not line up with the upper receiver properly.
With some minor changes to the machining program I hope to correct these issues.
threaded the correct [...]]]>
threaded the correct number of threads with the proper pitch.
To accomplish this step a fixture plate was design and machined.
And orientated to hold the part in the correct position.
After machining the actual buffer tube was installer to verify proper fit
The completed receiver is getting closer
It also dissembles and the stock comes off.
There was a print of it [...]]]>
It also dissembles and the stock comes off.
There was a print of it taken apart.
I thank LAI publications for posting about this rare and interesting weapon. I decided that I need one in my collection. There is no chance of buying one and it is full auto so actually making one that is exact is out of the question. However I can make a semi auto one. As with all of my projects I need to design it from scratch. With that in mind I have started just that, but I am making a few changes to the design. First I will make it in 9mm and not in 7.62×25 Mauser. Second, I am going to make it to use a different magazine. I have never been a fan of the Mauser style magazine. they are expensive, a number of the ones I have do no fit properly and they are hard to fine.
My favorite magazine for my Broomhandle projects is the Finnish M/20 smg magazine. They are available at Apex gun parts.
It is a great magazine that I will cut down to 25 rds.
The first step was to design the lower receiver to use a M/20 magazine. I started this process with using a cut Chinese Schnellfeuer lower.
I was able to make a basic solid model but with the proper dimensions for the M/20 magazine.
There is a number of features missing from this model but, it is just a starting point. So I printed it out on m Bambu P2S 3D printer.
I was able to check to see if my magazine housing was dimension properly, and it was.
The next print will have the magazine release button. The rear of the receiver needs to be corrected. the bottom of the receiver is to thick and it receiver needs to have internal dimensions reduced. I am currently working on the second model receiver and should have it completed by the end of next weekend. I also need to add the dove tail slot in the front of the receiver
The first part that I printed out and checked is the fire control group. I Then used Bambu studio to do a slicing program on it. It [...]]]>
The first part that I printed out and checked is the fire control group. 
I Then used Bambu studio to do a slicing program on it. It was down loaded and printed out
After it was printed out it was checked with actual components to verify proper fit up.
There are a few minor changes that need to be made, but so far it does not look to be out of spec.
The magazine release button also changed from an inside cut to and outside cut.
The other issue that was found was that the selector stops were located in the wrong spot.
All the issues have been corrected and checked. Next is to design a logo and write the printing program then start making Sudanese lower semi receivers.
This is the part in question.
Here are the patent drawings that I [...]]]>
This is the part in question.
Here are the patent drawings that I have been able to locate.
This last one is a color picture from a book
All the references are different then the patent drawings and while I have made a solid model of the part I am not sure it is correct.
This is the solid model.
I am currently at a loss in the proper design. I am not sure what holds it in place and it’s relationship to the magazine release. I am hoping that when I 3D print the lower receiver I can get a better understanding of how this part is actually design and fits into the weapon
]]>
I used to recommend Bret at McWilliams sales and service. Well Bret has retired. The person to call now is Kurt at 734-449-4008. The contact email is [email protected]. I chatted with Kurt in depth and he seems like a very nice guy to deal with. He can help with some spares, board re-build and technical support plus consumables. He also has a couple of technicians to help with troubleshooting. The web page is also back up, https://www.mcwilliamsedm.com/index.html
Hope this helps all the people looking for help with there Japex machines.
]]>These are the pictures of the different fire control groups.
This is the second fire control group I located.
and finally the third type.
compared to a C-96 fire control group.
There are a number of changes between all the models. It was a start and next came the solid model attempts. there are subtle changes between all the models.
The first model
Second model
The third version.
And finally the fourth model
When all the fire control components are modeled I will work on an assembly. This will allow me to check for proper fit and measurements.
The machined op1 piece was set in the fixture and tighten down
All the holes were drilled in op1 so now the [...]]]>
The machined op1 piece was set in the fixture and tighten down
All the holes were drilled in op1 so now the bottom was milled off and the receiver was contoured.
When the second side was complete receiver was removed and debured and parts were checked for proper fit,
The magazine release was checked for proper fit.
Op 3 was conducted, out of house, This is where the magazine housing was edm. it was then checked with a number of magazines to verify proper fit.
Next post will be about op4
One of the pieces that I would really like to get is the [...]]]>
One of the pieces that I would really like to get is the 1917 Mauser trench carbine, as well as a slab side, a 20 shot pistol and a Schnelfeuer. However due to the cost of these pistol it will probably never happen. But the 1917 just might.
It is a classic design
These are a couple of pictures on the internet that I found from an auction site and a web page. This is just a good looking gun and one that I have never seen in person or will ever own. In fact the only way I will ever own one is to make it myself. This will be a long and interesting project. Most of the parts are not interchangeable with the normal C-96 pistol, but some are close and other are basically the same. To accomplish what I want to do I started by obtaining all the photographs that I can find from books, videos and pictures on the internet and from friends.
I have also located patent drawings that has helped with some concepts and line drawings.
There is also a c-96 cut away in my collection which allows be to study the concept and method of operation
Then I take pictures from the C-96 parts that I own.
To be able to obtain accurate measurements the pictures need to be as close to 90 degree as possible to eliminate distortion.
Having assembled everything I can on a part or assembly I then check for common measurements then I down load pictures into Fusion 360 and using the known dimensions I calibrate the photo and start a basic drawing of the part or component. Frequently it takes a number of different solid models to finally come up with one that has what looks like proper dimensions. This solid model is of the fire control housing and is close to being complete.
When the rest of the fire control are completed then an assembly will be made showing all the parts as a completed model. I will then perform an analysis to check proper fit and alignment. Once I am at this point of the design I will make a 3D print of everything and actual do a physical inspection. This is a Schnellfeuer frame I did a while back.
When the plastic model is complete I will start the process of making a cut away steel model and check everything again prior to making a complete and functional weapon. Currently I have approximately 60% of the project in a solid model. If anyone knows someone that owns a 1917 trench carbine I would really like to chat with them. I could use some specific pictures and measurements. If I am unable to find a person with one then it will just take a little longer to work through the problems.