Jeez, it looks like you're building a WW1 railway cannon!
you know the secret of all engineering projects right..
TLDR; "what stock have I got for this project?"
full version goes:
"Bob, what kinda stock we got out back?"
"Go look yourself FFS, what am I the godamned stock boy?!"
"Bob.. you know I can just tell IT you watch porn in your lunch break right..?"
"<grumbles, metal clanking> there summa that AL 1/2 inch siding left.."
"How much?"
"go **** yourself."
SO: Without physically checking the stock Bob said you have, you draw everything, and then only go out back to bring it to the mill.. notice that 1/2 inch is actually 10mm, but, the cnc path already made, so you just kinda scale the gcode a tad, and when its all said and done you say to yourself, DAMN.. thats chunky, you also consdier why you keep Bob employed.. hand it over to the marketing team and shrug your shoulders.. the marketing team handle it like so..
AL too thick - "Robust construction, eliminates vibration and flex!"
Used AL instead of Steel - "Full aviation grade aluminium construction, strong and light!"
Bolted not welded - "Easy high precision construction, replaceable parts and upgrades!"
Tolerances too loose - "Tolerance allowance for easy fit, use included spring washers."
Squat because stock too small - "Compact space saving design!"
etc etc..
Next time you buy something look out for the tag lines hiding the bad engineering choices
