I have recently ordered the detailed drawing from the ASSRA and was wondering if anyone has had any issues creating a 1885 highwall from the drawings?

I don't. Please post lots of progress photos, this is something I would like to try!

Should be no problem doing so if you have an original high wall, and take measurements off of it and substitute what you measure for what is on the drawings. There are numerous angular and dimensional problems with the drawings. Those drawings were made by a draftsperson for the old Bison reproduction casting company, and they were not well truthed for accuracy. I have heard complaints from every person that tried to use them without verification. I think the plans would be a good basis for writing your verified numbers on to while you measured your original action.

Another approach, if you have the program and skill to do so, would be to take those dimensions and build a 3d computer model of the parts, and check them for fit/interchange. That would show up a lot of the problem areas. A friend did that for one of the other models that these plans were made for, and he was able to spot several fatal dimensional incompatibilities between the pieces.

I have a set of the plans made by the same person/company/process for the remington rolling block. There are numerous errors on those drawings also. Some as basic as the wrong screw and thread dimensions. A lot of missing dimensions, and some that appear to have been wild ass guesses of something that was hard to measure, like radius' or tangency.

dave

Dave, you are correct. Ain't no free lunches.

3D modeling is really the way to go

Then study the finished model for the best way to tool the parts. With the appropriate tooling tabs you can simplify a lot of the fixturing problems.

Miles, welcome to the board. Off topic question...are you any relation to Jack Hamrick?

Thank you and to my knowledge,no. Thank you for everyone's replies they have been very helpful.

quote:

Originally posted by SR4759:
3D modeling is really the way to go

Then study the finished model for the best way to tool the parts. With the appropriate tooling tabs you can simplify a lot of the fixturing problems.

I hope your talking about CAD and not SLA or SLS

I know I was talking about CAD, not rapid prototyping.

I learned a long time ago, I can build an exact model in AutoCAD, and if the parts will go together without interference, they will do so in the real world. I learned it on structural steel details, but the principle works the same with gun parts.

I built a 3D model of the Fields Patent falling block a while back. It was interesting to teach myself 3D cad at that level of detail. I set it up so I can have the main receiver and block fabbed with 2 dimensional wire EDM in two setups, and setup the whole thing using the pre-drilled and threaded barrel hole to attach the steel block onto a jig. I also set up the flat internal pieces the same way, and have them set up for abrasive waterjet cutting. Haven't had time to set up the rest of the internal parts yet for wax casting, so don't know how practical the whole thing will be to complete.

It's a new world out there with CNC machining centers, 5 axis wire EDM, abrasive waterjet technologies. A lot of near-net finish product technologies available today, and they let you use materials such as pre-hard 4140. Substituting $150,000 machines running unattended 24/7 for expensive and hard to get skilled labor. Makes the high skilled labor that much more precious and hard to find.

dave

A piece from CAD. A bolt release for my L46 Sako.

Behind the bolt release is the housing that I made for it.

Trigger guard for my Pierce 6.5X47L.


Prototype CZ452 2oz trigger
If you have a buddy like I do to make the CAD drawings and another to do your EDM, you are in heaven.

Wire EDM

Nice work, Ted,

That trigger is quite clever.

dave

I was talking about CAD but there is nothing wrong with the printed or SLS or SLA parts. Engineers design with those tools today and have been for about 20 years. It is always nice to get a replica in your hand to give you a real 3D perspective. You can even assemble the plastic or paper parts. If you don't like the results change the CAD data and print another.
Once the CAD data is acceptable you have the data a programmer can use to drive a milling machine.

quote:

Originally posted by ted thorn:

quote:

Originally posted by SR4759:
3D modeling is really the way to go

Then study the finished model for the best way to tool the parts. With the appropriate tooling tabs you can simplify a lot of the fixturing problems.

I hope your talking about CAD and not SLA or SLS

Ted,
Yes, that is wire EDM.

The industry I make my living in couldn't live without a wire and sinker edm

As far as the use of SLA or SLSA.....3D cad data all but replaced them in my line of work.
Besides they were expensive and the SLA parts are fragile