Re: Material Choice

"Bob La Londe"  wrote in message news:v37udn$18tac$1@dont-email.me...
...
The strongest by a lot would be the 4140HT, but it has its issues.  Its
tough to machine, but I can do it.   It would have the least flex, or
compression, but it can warp during machining.
...
Bob La Londe
CNC Molds N Stuff
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4140HT has the same Young's Modulus as mild steel and will flex the same, up to mild steel's yield point.
https://www.matweb.com/search/datasheet_print.aspx?matguid=8e87bc1cf20343b985b1a46a1f1eb1c3
For equal thickness (any) steel flexes about 1/3 as much as aluminum.
https://en.wikipedia.org/wiki/6061_aluminium_alloy
"Young's Modulus is 69 GPa (10,000 ksi) regardless of temper."
https://asm.matweb.com/search/SpecificMaterial.asp?bassnum=ma7075t6
It's stronger but not significantly stiffer than 6061.