- Feb 20, 2010
- Reaction score
- Twixt Tyne and Tees
Goldstar31, a required topic in Mechanical Engineering school (Manufacturing Processes class to be specific) is learning how to calculate the temperature rise of metal chips as they exit the cutter-head of a lathe (a function of the material's yield strength, tensile strength, Young's modulus, Poisson's ratio, shear-angle of the cutter, and obviously the volumetric removal rate). It's calculus based equations, rooted in both Mechanics-of-Materials and Thermodynamics.
The purpose of the lesson was to show that it's mathematically possible to accurately predict the actual cutting-power requirements for any particular machining operation, and the expected temperature rise of the cutter (which will temper/anneal if it gets too hot), and also the expected temperature rise of waste chips - because some metals will make for very exciting shop-fires with inadequate cooling . . .
Welcome to reality. . . . .
Reality is the ability to retire comfortably at 55 years( far to late in life but who cares now at 88)
Reality is to realise that
'one man's meet is is another man's poisson' and of course for the Francophile -- Poisson D'Abril.'
But for those who can really do maths, having a machine shop or whatever you call it and whatever I would call it, is a fine way not only to alienate neighbours but to ruin a fairly substantial investment of 2/3rds of a million in sterling and that , if you are still with me, is a lot of scrap lathes.