Homework #5: Economics of Tooling
C = Cost/part ($/part) = t (L + H)
t = Total time per piece (hours per piece)
L = Direct labor rate ($/hr)
H = Overhead rate ($/hr)
Total Cost, TC = NC + Z
TCold = N COld + Zold
Introduction to CNC Machining
Design -> Build & Prove Prototype -> Production
The bugs are worked out in the prototype stage which is getting shorter time wise. In
fact some manufacturers are skipping the hard prototype models and going in for
Introduction to CNC Programming
Consider the following part that is to be machined to the indicated profile.
1. Draw this part on a piece of Engineering Paper with dimension on the inside of
2. Place the zero coordinates for both X an
HOMEWORK #3: COMPOUND REST AND CROSS SLIDE
After making one turning cut, the cross slide handwheel is fed one revolution clockwise and
another cut is taken.
1. What will be the resulting change in work diameter?
2. How far di
Milling and Drilling
N = 12 V / d
Week #6 - Lecture
Clearance fit < 0.020 difference between parts
Hole is bigger than the shaft.
Press (interference) fit < 0.020 difference
Shaft is bigger than the hole.
Knee Mill Terminology
Cutting Tool Technology
Midterm: One week
Week #4 - Lecture
In the theory of chip formation as the tool is forced into the
work material, the chip is formed by shear deformation.
Economics of Machining
Time is money.
You must make a profit to stay in business.
Week #7 - Lecture
Fundamentals of Economics of Tooling
Tools cost money, and therefore money can be spent for them only if the
purchase earns a profit.
If a decision must be
Speeds, Feeds, Depth-of-Cut, Feed
Rates, & Cutting Times
Overview of Machining Technology
and Process Planning
Weeks #2 & #3 - Lecture
HW #2 due next week (Wk #4) at the beginning of lecture
HW #3 due following week (Wk #5) at the beg
Speeds, Feeds and Depth of Cut
Use Presentation 2 and 3 to answer these questions.
1. When comparing the circumferential speed of two cylinders turning in two lathes at the
same number of revolutions per minute, the _ diameter part has greate
HOMEWORK #4: Milling and Drilling
F (ipm) = fr = N (rpm) x nt (tpr) x ft (ipt)
Material Removal Rate
Q = fr (c) (w) [(ipm) (inches) (inches)]
Power Feed Cutting Time
T = Length (of power feed) / Feed rate