cc_aitlin
Mechanical
- Nov 1, 2022
- 1
Hi,
I'm designing a large and heavy vibration fixture, made out of several machined plates of 1" thick aluminum alloy (total assembly weight approximately ~750 lbs). I've been going back and forth with a coworker on bolt sizes, which is driven by our choice of key insert, which is driven by our available edge distances.
He is set on using ~20+ #8-32s along the side face of this 48"x48"x1" plate in order to keep a hole distance of > 1.5D from the edge, where D is the nominal external thread diameter of the key insert. I'm concerned about the strength of 8-32s in this application, considering the thickness and weight of the whole structure, so I suggested using 12x 1/4-20 inserts where the edge distance would be about 1.14D. It's pretty close but the fixture is definitely overengineered for the situation and all the information I've gathered online has ranged anywhere from 1-2D.
Is it best to use #8 or 1/4-20 inserts in this case?
I'm designing a large and heavy vibration fixture, made out of several machined plates of 1" thick aluminum alloy (total assembly weight approximately ~750 lbs). I've been going back and forth with a coworker on bolt sizes, which is driven by our choice of key insert, which is driven by our available edge distances.
He is set on using ~20+ #8-32s along the side face of this 48"x48"x1" plate in order to keep a hole distance of > 1.5D from the edge, where D is the nominal external thread diameter of the key insert. I'm concerned about the strength of 8-32s in this application, considering the thickness and weight of the whole structure, so I suggested using 12x 1/4-20 inserts where the edge distance would be about 1.14D. It's pretty close but the fixture is definitely overengineered for the situation and all the information I've gathered online has ranged anywhere from 1-2D.
Is it best to use #8 or 1/4-20 inserts in this case?