Display More[quote='Don Paul','http://spearfishing.world/forums/index.php?thread/&postID=71862#post71862']
I agree that milling a pocket is a good idea vs just screwing the handle to the surface of the gun.
So to make sure we are on the same page, did you see failures from the repeated shock causing the screws to loosen up then the screws shear off? or the screws sheared off with everything ridgid and tight?
I don't think you are refering to the screws getting pulled out of the wood.
Being in a saltwater environment corrosion might add to the weakening of the screws. I would think this would be minimal. We all wash and take care of our equipment. Impact on the wood vs the metal would be my guess.
If we are talking a metal fatigue failure from repeated loading and unloading, that would be interesting. Th number of cycles and amount of actual strear force would have to be higher, I would think from a gut feel.
Do you remember the size of the screws that failed, probably an 18-8 Stainless I would guess, not a zinc plated alloy steel.
Let me look up some shear numbers on a #6 or #8 screw.
Regards -John
I'll see if I still have the guys old stock this weekend, but I might have wacked it for wood.(I didn't build it).
On paper when we do the numbers on the hardware and recoil force and give it a go, all seems well....
Then the handle gets taken off and on a few times trying to get one more barrel in that fishing pole case headed for baja.
The guns arrive and we celebrate with a few shots with your friends before heading back to the hooch to screw the handles back on. The SS screws give a little screech as we over torque them into place, but the gun is fine this trip.Later when you are in the water the Panga skipper is pounding uphill in short chop and the guns get tested for build strength. The motorheads and engineers among us throw all the hardware (screws) away when they get back home, but most will not. Years go by and on one trip the gun is loaded with 3 or 4 hot 300% elongation 5/8s rubber. The next day our hunter takes aim at a record grouper, the shaft doesn't go far as the handle shears the screws. The butt of the gun drives his nose bone into his skull...blood is everywhere. The Mexican Navy is called in to medivac. My friend is very very wealthy but his $ can't save him now, he is in the hands of the gods. I have personally seen this happen twice with broken hardware on handles not keyed to the stock.
Mother nature and abuse will surprise the shite out of a guy with a shear/elongation chart in his back pocket.
Anyway both guys lived, but the guy with the bucks spent 80K in getting his face fixed.
Cheers, Don