I have worked a little with high density polyurethane expanding foam and can't help but wonder how it would work as a medium for producing a good band speargun.
The stuff is rigid, resistant to rot, rust, and damage from just about anything it comes into contact with.
You would have to start with a master design and then create a mold from it but once that mold is created you could turn out just about as many gun bodies as you want. Unfortunately due to the price of the expanding foam, I think that only smaller guns would be reasonable. This works for me as I dive inshore shallows and in rocky/kelpy areas.
The master design could be fully fabricated with inlets for bands, spear channel, and trigger mechanism and with a careful mold design this could translate into a speargun body that you just add parts to and you are ready to go.
Does this make any sense? The foam floats, but can easily be made neutrally buoyant by adding weight in the right areas.
I just like the though of being able to produce a product that you can just drop a couple of parts into and you are ready to go with only minor fit/finish work necessary.
I have the IDEA for such a thing, I can come up with a rough sketch of what I have in mind. I know a skilled CAD drafter that might be able to produce a 3D template for a master that can be milled, but I need some more input.
Any Vaccu-Form Molders out there
Structural Engineers
Drafters/Designers
Losing Sleep over this concept.
:head
The stuff is rigid, resistant to rot, rust, and damage from just about anything it comes into contact with.
You would have to start with a master design and then create a mold from it but once that mold is created you could turn out just about as many gun bodies as you want. Unfortunately due to the price of the expanding foam, I think that only smaller guns would be reasonable. This works for me as I dive inshore shallows and in rocky/kelpy areas.
The master design could be fully fabricated with inlets for bands, spear channel, and trigger mechanism and with a careful mold design this could translate into a speargun body that you just add parts to and you are ready to go.
Does this make any sense? The foam floats, but can easily be made neutrally buoyant by adding weight in the right areas.
I just like the though of being able to produce a product that you can just drop a couple of parts into and you are ready to go with only minor fit/finish work necessary.
I have the IDEA for such a thing, I can come up with a rough sketch of what I have in mind. I know a skilled CAD drafter that might be able to produce a 3D template for a master that can be milled, but I need some more input.
Any Vaccu-Form Molders out there
Structural Engineers
Drafters/Designers
Losing Sleep over this concept.
:head