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IndustryArena Forum > Mechanical Engineering > Mechanical Calculations/Engineering Design > Engineering help with prototype part made from 7075 Aluminium
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  1. #1
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    Nov 2021
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    1

    Engineering help with prototype part made from 7075 Aluminium

    Hello everyone,

    I needed to ask some questions regarding a prototype that i have designed, the prototype part is a scope ring which mounts onto a mil spec 1913 picatinny system it has a recoil lug and has a clamp at the bottom which then is tightened by fasteners it also has a top clamp that is secured with fasteners around the optic.

    My question is regarding the tapping of 7075 aluminium and the torque limit in my design I am using m4x7 grade 8 fasteners which i would like to have reach between 15-20 in/lb of torque on the top of the part and 35/50 lb on the bottom clamp i would like to know if this is achievable with grade 8 fasteners on a 7075 aluminium body i am planning to give life time warranty on the part and i am concerned about thread stripping etc.

    The second question is regarding the thickness between the holes created and outer wall what is the minimum distance in mm that i can have a tapped hole near a edge or a wall of the part before it loses it's sructural integrity etc.

    Please find the attached pictures of the design and it would make better sense of my questions.

    I thank you for your help and looking forward on solving this with your help.
    Attached Thumbnails Attached Thumbnails engexample3.jpg   engexample2.jpg   engexample.jpg   engexample4.jpg  

    scope ring xray.jpg   xray2.jpg   xray3.jpg  

  2. #2

    Re: Engineering help with prototype part made from 7075 Aluminium

    Pictures?

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