But who has enough free wall space to put one up?
Walls are far too useful for hanging shelves on. Covering with a chart that I can't read without switching glasses is just a waste. First step on the slippery slope to floral wallpaper.
Its all in the Zeus book in my pocket anyway.
What I'd like to see is updated versions of the cardboard or plastic slide and window "rulers" giving speeds and feeds for various sizes of milling cutters that the tool makers used to give away.
I imagine many neophytes would be glad of a similar thing giving speed against diameter for lathe cutters too.
Although its seen as an obsolete technology I have several such devices and find them a very useful way of presenting essential data without wading through massive tables. The Unbrako ones giving socket head screw data are perhaps the best engineered.
Clive