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PostPosted: Sun Mar 08, 2015 8:48 pm 
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I'm making embarrassingly slow progress on this, but at least it's getting to the point where I can try it out. This is the part that I started designing in Freecad in this post: topic66686.html

I'm building it as a metal skeleton which I hope to eventually build a fiberglass body around, with wood for the butt, cheek rest and pistol grips. The fetchingly pink butt (!) is a mock up using insulation foam so that I can try out different shapes before committing it to wood.

Attachment:
IMG_8325.JPG
IMG_8325.JPG [ 185.92 KiB | Viewed 638 times ]


The LOP is adjustable between 13.5 and 15.5 inches, and there's 3 inches of vertical travel in the butt adjuster. Initial testing with the beater gun suggests I prefer it towards the long end of the LOP, so I might add another inch to the spine. I'm also at the bottom of the range of travel on the butt, but the sights on the beater are low compared to the real ones, so that may not be much of an issue. I like the curve on the butt, but it needs to be thinner - at the moment it presses too much into the inside of my arm.

Next up (literally) is the cheek riser. Worryingly, the natural place for my cheek seems to be right over the LOP adjuster, which is going to be a PITA to do without fouling the adjustment rods for the butt. I could offset the cheek riser sideways on the frame, but that might make for a bit of a fat stock, or I could try and do a big offset from front to back, but I'd have to use some fairly heavy stock to make it stiff enough. Decisions, decisions! I'll need to get it on the actual gun (my latest 1377) to get a better feel for where it needs to go, and then take it from there.

Jim


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PostPosted: Sun Mar 08, 2015 10:16 pm 
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Location: Victoria, BC and Clarkston, WA
That is pretty nice Jim! Yeah the hard part is doing the design! I am trying to design an adjustable butt plate that goes on an AirForce 500cc tank. No clue how to start?????

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Pardini K10
Brocock Concept .22
3 Custom Crosman 2260
Benjamin Discovery .22 w/Joe Hickey stock!
Crosman 150 pistol .22
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Mrodair CP-1M .22 and .177


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PostPosted: Mon Mar 09, 2015 7:46 am 
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Do you have one of the factory butts that you can build on, or are you starting from scratch?


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PostPosted: Mon Mar 09, 2015 2:00 pm 
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Well Jim I was thinking of starting using the factory mount, which is just one screw!

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-Rick
Pardini K10
Brocock Concept .22
3 Custom Crosman 2260
Benjamin Discovery .22 w/Joe Hickey stock!
Crosman 150 pistol .22
4 Crosman MK 1 pistol .22
Mrodair CP-1M .22 and .177


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PostPosted: Mon Mar 09, 2015 9:58 pm 
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That doesn't sound like much to work with :)

So it didn't come with a butt like this?
Image

That looks like it would be a good starting point, with the clamp already sorted out.


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PostPosted: Tue Mar 10, 2015 12:51 am 
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EverHopeful wrote:
That doesn't sound like much to work with :)

So it didn't come with a butt like this?
Image

That looks like it would be a good starting point, with the clamp already sorted out.


No! It's the old style. A rubber plate that screws into a nut under the neoprene cover.

_________________
-Rick
Pardini K10
Brocock Concept .22
3 Custom Crosman 2260
Benjamin Discovery .22 w/Joe Hickey stock!
Crosman 150 pistol .22
4 Crosman MK 1 pistol .22
Mrodair CP-1M .22 and .177


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