0
$\begingroup$

I'm designing what is called a "Red Dot Sight Mount" (see image below) for a handgun.

Disclaimer: this kind of part is not regulated (at least not in any country that I can think of) and does not modify the functioning of the gun in any way (it's just a part that holds an electronical sight on top of the firearm), that's why I'm attempting to build this even if I have no experience in mechanical engineering.

This is what it looks like (this is one from a random manufacturer): Example of Red Dot Sight Mount

My question is: what should be the minimum thickness of the top part (the part with a red line on the picture above) so it doesn't break or bend/deform? The material is 7075 Aluminum with a type 3 anodizing finish.

The main thing to take into account will probably be the recoil of the firearm (9x19mm caliber pistol) which produces a recoil of about 2.7 kg.m/s, but then I have no idea what to do with it.

Most mounts sold commercially are about 0.10in-0.15in thick but I would like to go thinner to have the sight sit lower.

I understand the answer to this question might be complex and it might not be possible to give a numerical answer without (much) more details, but could you perhaps give the method and main formulas? Or a software that could be used to run simulations?

$\endgroup$
1
  • $\begingroup$ Make it curved, but 1/10th is already fairly thin for aluminum. $\endgroup$
    – Rob
    Commented Dec 23, 2022 at 0:52

1 Answer 1

1
$\begingroup$

No one would design this, they would do it iteratively. Too many variables:

  • acceleration of the slide starting and stopping
  • mass of the sight
  • grade of aluminum
  • mounting method

"Minimum" isn't a spec. A spec is an expcted lifetime on a specific platoform.

I don't know who could actually tell the difference in a .1" vs .05" elevation of a sight other than aesthetically. And it would be easier to mill it deeper into the slide.

$\endgroup$
1
  • $\begingroup$ I think that mount is meant to slide into the rear sight dovetail. $\endgroup$
    – Drew
    Commented Dec 18, 2022 at 11:28

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.