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Old 12-05-2012, 10:39 AM
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Thordo Thordo is offline
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Quote:
Originally Posted by Sydwaiz View Post
I'd like to know if an A1 length will be offered. And why did you choose PC/ABS? Simply because they solvent weld the easiest? It isn't the best choice for chemical resistance. Many solvents and cleaners will easily ruin it. Since you are injection molding, why not use a better suited material and sonic weld the two halves together? Heck, I wouldn't even mind if the two halves were screwed together.
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Hi Sydwaiz,
We will be offering LOP spacers once the rest of the tooling is up and running. The length for the base stock was chosen because it was by far the most common length in our survey. For now, slip on butt pad spacers are an easy way to increase LOP and they're cheap.

We went with PC/ABS for the machined run because it is the strongest, most cost effective, and bondable material commercially available. Despite its vulnerabilities to certain chemicals. We have tested the ABS against most gun lubes and solvents and it didn't have an effect. The molded production stocks will be 20-60% glass filled nylon.

Ultrasonic welding was one of the first options we looked at. The quote we got for the machine was $60K plus $20K for a custom horn plus 50 production stock halves for them to tune the horn with.

Small design alterations are inevitable over time and we didn't want to pay for a new horn and tooling every time.

Self tapping screws tore out in drop testing and imbedding inserts to use machine screws is time consuming and expensive.

Thordo
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