Making a stock with a cnc

marba

marba

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Cowichan Valley ,B.C.
Hi,
I have a neighbour that has a CNC machine and he wants to make me a riflestock with his machine. Myself, I don't have a clue about the machine.My neighbour this it a snap to do.I have been reading up about 3axis machines and his machine is a 3 axis .Tonight we talked about how he is going to do it and he is going to build a motorized tailstocks to turn with the cutting. I have a question IS THERE A DRAWING WITH MEASUREMENTS for a sporter
p14 stock?????
 
Probably not.

Most gunstocks are made on duplicating lathes, rather than CNC.

I've been trolling around the gun sites for a few years, and never seen any CNC stuff for stocks.

Might be an idea to check on some of the woodworking forums on cnczone.

As long as he's in a building mood, get him to build a touch probe to go with the 4th axis he's building. That, and the appropriate software, and you can duplicate about anything you can get onto the machine. Up to a point.
Of course, making any changes is problematic. More software, more learning curve, more cost.

As much as I like machining, this sort of application is , well, the wrong use of the technology. There are easier, better ways to build a stock, IMO.

Don't let that stop you from trying, though!:D

Cheers
Trev
 
It's simple, scan in 3d and/or draw it in cad, make a tool path suitable for the part, material and machine and run the file. This is how we make our master stocks prior to making molds. It is not for the faint of heart but it is accurate. For wooden stocks it is much simpler to build a duplicator and copy an existing stock. If you don't have a stock you like find something close and get a litre of bondo and stop when you like it.
 
The stock will have to be drawn in CAD. Which for me is the hard part. I have done a CAD drawing and tool paths for inletting for a rem 700 but the rest of the stock would take some time. One other problem is most metal machining equipment doesn't like wood dust in the ways and ball screws. I use a shop vac. while I am CNCing aything wood.
Show some picks if you get anywhere.
Stephen
 
Thanks guys for all the input ,My neighbour just told me today JUST GET ME A DRAWING and its a done deal. He also was talking about making me molds also to make fiberglass stocks. So I'll keep everybody informed with the going ons,again thank you everybody for your input , MARBA
 
x3 for me, too.

I wish you luck, but I think the only way you will end up with a drawing, is to sit down and draw it. A bit of an uphill slog, if I dare say, to choose and learn enough about a CAD program to make it work.

Not impossible, but a lot of effort!

Cheers
Trev
 
The hard part is to draw it for sure. Some parts are easy, like most front ends and some back ends with the compound curves of the grips being the hardest. We draw in Rhino which is excellent software for a reasonable price. I am also fond of carving a grip until it feels right and then do a 3d scan and import this into the drawing to combine the parts together. If you are working in wood then you can always draw the easy parts and leave the grip etc oversize and finish these parts by hand. You also need to be able to cut out a proto first because what looks good on a screen is seldom perfect when you feel it.
 
Drawing ????

DRAWING ????
Come on guys get with the now , down load the free version of Bobnest at
www.bobcad.com , take a picture of the stock you want with a digital camera , put it in your PC , and run it through the bobnest program it will convert it to a digital image then use either master cam / gibbscam or bobcad cam to create a cnc program , we use it all the time for machining contours it works great once you learn the software: or else borrow a stock from someone if possible and have someone measure it on a CMM ( reverse engineering ) that will give you an accurate dimensional immage of the part then generate a machining program from the data.
 
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Yup. Drawing. It's still a drawing when it's on a CAD program. Or a solid body, I suppose, but "drawing" still works.:)

I like the economics of this one. One free download, to feed into a $7k-$30k touch for the CAD_CAM program (depending on your options), or a CMM for $80K or so....:D

All to replace about 5 hours with a wood rasp and orbital sander! Keeping fully in mind that this is not supposed to be a commercial venture, so, I am presuming, money is not unlimited. Dunno what the market would be for P14 stocks these days, but I'm guessin' it's not huge.

My suggestion would be to draw up the inletting, and use the CNC milling machine to carve that out. Good use of the technology, and probably a lot closer to the size capacity of the mill.

Cheers
Trev
 
How does Bobnest turn a 2d image into a 3d object? The web site doesn't talk about 3d? There are ways to do this with photogrammetry.
 
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Bob art !!!!

You have to use the BOB ART section in the program it has a 3 D viewer / imiger , Here is a photo of a T-53 turbine engine impellor hsg, the contour was photoed with bob nest wich gave us the contour then the spline program in master cam created the contour then g code and was machined on a HASS TL2 , we one of only a few shops in North America to use this technology to rework impellor houseing contours ,
It would work for a gun stock as well with the rite programmer useing the software , i am going to make a program by takeing a picture of a HS precision stock i have at home and create a program to machine it , I will post the results.:cool:
pocketbike.jpg





Ian Robertson said:
How does Bobnest turn a 2d image into a 3d object? The web site doesn't talk about 3d? There are ways to do this with photogrammetry.
Click to expand...
 
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