Gunsmithing How it starts for us.... Receiver modeling for stock work.

[LRI]

This morning's project for the stock dept: Getting the Sako 85 receiver modeled up so we can inlet stocks. It saves Shayne a great deal of work in the CAM software if he has a vetted model to run off of.

I threw in a few others for fun.

Legacy ARC Mausingfield Short Action:

Remington M700 with our M40 clip slotting stuff added.

 

[J-Hon]

Cool stuff.

With the 'factory' style of actions, do you find that the outside features and dimensional tolerances are very close from action to action?

 

[Just Macca]

That’s awesome. Could the Blaser R8 ever be on the horizon? An R8 in a Manners EH1 or similar would be awesome.

 

[fanninland]

That’s cool stuff. Wondering if there is a “breakeven” on projected number of inletting jobs to justify modeling a particular action.

 

[LRI]

Cool stuff.

With the 'factory' style of actions, do you find that the outside features and dimensional tolerances are very close from action to action?

For the most part. Yes. There are subtle variances here n there, but it's typically not enough to make any difference when were inletting a stock for bedding.

Years ago (almost 20 now) I began offsetting the inlet toolpaths by .05" so that I could control the resin volume/thickness between the action and the stock. The idea being to have a predictable/repeating amount of shrinkage and to try and improve the presentation by having a concentric/uniform amount of resin visible when were all done. Its why I kinda went off the deep end with the rib feature on the pillars we make.

 

[LRI]

That’s cool stuff. Wondering if there is a “breakeven” on projected number of inletting jobs to justify modeling a particular action.

If there is. I've probably not found it yet, lol.

I play the long game with this. So long as the process is vetted and follows the curriculum we have in place, then one manufacturer to another really isn't that much of a challenge.

There are exceptions though. I'm currently modeling up a Browning Medallion receiver. The rear guard screw is part of the trigger assembly. Bedding a rifle action with the trigger installed is a lesson I learned once in 2001. (A particular Walther rimfire)

That sucked. I spent almost a full day cleaning the clay out of that damn thing.
So, we'll make a false hanger this time and solve it another way.

 

[LRI]

That’s awesome. Could the Blaser R8 ever be on the horizon? An R8 in a Manners EH1 or similar would be awesome.

I guess anything is possible. I used to work on those things frequently when I was in Colorado. They were a challenge for sure. It would be one hell of a project!

 

[308pirate]

Cool stuff.

With the 'factory' style of actions, do you find that the outside features and dimensional tolerances are very close from action to action?

Minor correction, you can't deduce what the dimensional tolerances are from measurement samplings. Tolerances exist only on the drawings. Dimensional consistency (process capability) and tolerances (design allowances) are not the same thing nor are they necessarily related.

 

[pmclaine]

Love to see one of those clip slotted Remingtons in Parkerize.

 

[LRI]

Love to see one of those clip slotted Remingtons in Parkerize.

I have an old 40x at home that is starting to itch at me to complete. The plan was to turn it into my version of a legacy 40x clone, but my Dad has been rattling the fence about wanting a 6.5 PRC.

We'll see...

 

[LRI]

Older pics, but one of my personal favorites. Paul from Vudoo gave me a long leash on this one. We had a lot of fun with it.

Wood chassis block for the Vudoo GW action:

 

[fanninland]

a southpaw’s dream…

 

[pmclaine]

I have an old 40x at home that is starting to itch at me to complete. The plan was to turn it into my version of a legacy 40x clone, but my Dad has been rattling the fence about wanting a 6.5 PRC.

We'll see...

This one…….

 

[powdahound76]

You still dont have that thing @pmclaine ?

 

[lariat]

Quick question: are you scanning these receivers or do you manage to get drawings? In our shop we have used another aerospace service shop that specializes in laser scanning to create solid models that we can then use to replicate or create the associated assemblies desired. We have found interesting issues in the scans for some mechanical items that you wouldn’t find otherwise.

 

[E. Bryant]

We have found interesting issues in the scans for some mechanical items that you wouldn’t find otherwise.

I'm kinda curious as to what you've found. Certainly, picking off various dimensions with calibers often won't reveal issues like perpendicularity, etc.

I'm old enough to remember when we had to send automotive interior parts to the CMM shop to beep out a large number of points to form a relatively coarse "cloud", and then some poor CAD guy had to stitch together the surfaces. It probably took a week to get worse results than an hour with today's tools.

 

[lariat]

Mainly perpendicularity, but some dimensions that made zero sense. only to find out it was to accept either slop or a previous revision of an assembly. Without drawings it becomes a game of cat and mouse that ends up being a deep dark hole of reasoning, measuring a series of components that fit into the part, etc. Its straight up misery. And expensive since we dont have it done in house.

 

[LRI]

Quick question: are you scanning these receivers or do you manage to get drawings? In our shop we have used another aerospace service shop that specializes in laser scanning to create solid models that we can then use to replicate or create the associated assemblies desired. We have found interesting issues in the scans for some mechanical items that you wouldn’t find otherwise.

Except for ARC/Remington, these are parts that I've modeled myself.