# Lee Dippel

### From MathWiki

Back to MATH_1590 Final Project - My Interview with a Tool and Diemaker

Graham, my roomate works at Cianco Machining four days a week as a tool and diemaker. A die is a device with upper and lower plates that bend, cut and shape sheet metal into finished parts. For example, dies are used to stamp auto-body panels and to make the tiniest components of a watch. One day a week he goes to Seneca college for prescision skills training. Most of what he learns there is math. Each die must meet a specified degree of accuracy. Some as small as one thousandth of an inch (smaller than a human hair). Tool and diemakers use trigonometry to determine cutting angles. and other calculations for cutting speed,and other machine settings. The following is one such example: Feed (inches/minute) = #of cutter teeth X feed / toothe X cutter revolutions per minute Feed = #of teeth X chip per tooth X rev. per minute RPM = CS X 4/D = 80 X 4 / 4 = 80 RPM Feed = 10 X 0.013 X 80

= 10.4 inches per minute

Graham says that the feed affects the smoothness of the resulting cut. Taking the time to calculate the proper feed rate makes for a very smooth cut but experienced tool and diemakers can also tell the proper feed rate by the sound it makes.

I asked Graham if he just needs to go to school for the piece of paper or if he'll be using what he learns on the job. A lot of the math he learns can be calculated by the computer programs that run the machines but knowing the math is important for working on less technologically advanced machines.