Advanced CNC Milling and Drilling Quiz

A provider of machine shop training offers these questions for benchmarking metalworking knowledge.

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Expert Technical Training developed this test, which it gives to potential students to evaluate their need for the company's "Advanced CNC Milling and Drilling" course. A link to the answers can be found at the bottom of the questions.

1. What is the maximum rpm you should run a holder if it is unbalanced in a V-tapered spindle?
 
__ 4,000 rpm
__ 6,000 rpm
__ 8,000 rpm
__ 10,000 rpm
 
 
2. Unless it has a special design to ensure Z-Axis accuracy, V-tapered tooling should never be run faster than…
 
__ 6,000 rpm
__ 8,000 rpm
__ 10,000 rpm
__ 12,000 rpm
 
 
3. Countless tests have proven which of the following tool tapers to be superior in radial and axial stiffness, z-axis repeatability and performance for high speeds?
 
__ CAT
__ HSK
__ BT
__ SK
 
 
4. You should never use a cutter that has _________________ in a hydraulic holder, a milling chuck or in high speed applications.
 
__ Weldon flats
__ Hybrid coatings
__ Multiple inserts
__ Through-spindle coolant
 
 
5. One of the key limiting factors of a C-frame mill design is…
 
__ Workpiece visibility
__ Top-end rpm
__ Tool-magazine capacity
__ Y-axis rigidity
 
 
6. What is the name of the rotational axis that corresponds with the Y-linear axis?
 
__ A-axis
__ B-axis
__ C-axis
__ W-axis
 
 
7. The machine ____________ plays a key role in isolating and absorbing vibrations and shock from the cutting operation on the machine as well as surrounding impacts on the shop floor.
 
__ Column
__ Frame
__ Ways
__ Foundation
 
 
8. If the _________________ is too long on a machine, it may whip in the center, causing machine-component- and part-damaging vibrations.
 
__ Linear Guide Way
__ Ball Screw
__ Rack and Pinion
__ Box Way
 
 
9. Using a ________________ in your CAM program eliminates 90 degree corner moves, saving on tool and machine life, as well as increasing part quality.
 
__ Radial Lead-in
__ Smoothing-radius
__ Collision check
__ Radial Step-over
 
 
10. A material’s machinability rating is a(n) _______________ value given to a particular material’s ease with which it is machined.
 
__ Objective
__ Subjective
__ Standardized
__ Letter
 
 
11. ________________________ is a measure of the linear-distance that a single point on the outside edge of the cutter is moved around the circumference as the cutter rotates in one minute.
 
__ Feed rate
__ Cutting Speed
__ RPM
__ Chip load
 
 
12. Using (an) _________________ can destroy the effectiveness and efficiency of a cut when machining ferrous alloys with coated-carbide cutters.
 
__ Flood coolant
__ Air blast
__ Air/Mist blast
__ Chipbreakers
 
 
13. When taking a depth of cut that is smaller than the full radius of the cutter, the actual amount of the cutter that is engaged into the workpiece is called the…
 
__ Actual Diameter
__ Actual Engagement
__ Effective Radius
__ Effective Diameter
 
 
14. A standard for maximum Length to Diameter (L:D) ratio for normal sized (not micromachining) cutters being held outside the holder, without having to slow rpm and feed, is…
 
__ 2:1
__ 3:1
__ 4:1
__ 5:1
 
 
15. _____ is a man-made synthetic cutter that has greater thermal resistance than diamond.
 
__ CBN
__ CVD
__ PCBD
__ PCD
 
 
16. _____________ is the secondary ingredient used in tungsten carbide cutters that acts as a binder, and has a dramatic affect on the overall hardness of the carbide itself.
 
__ Aluminum
__ Iron-carbide
__ Cobalt
__ Silicon
 
 
17. The ________________ of the cutter is responsible for generating the essential aluminum-oxide in a high-speed cut in ferrous materials.
 
__ Geometry
__ Thickness
__ Speed
__ Coating
 
 
18. To perform high speed machining, all holders and components should be balanced to a rating of _________ for the rpm they will be run.
 
__ G1.0
__ G1.5
__ G2.0
__ G2.5
 
 
19. High speed machining (which might more appropriately be called “High-Efficiency Machining”) works because the ______________ and ______________ are controlled at the point of cut.
 
__ Heat, Vibration
__ RPM, Feed rate
__ Loads, Limits
__ Time, Temperature
 
 
20. High-speed machining begins at 8,000 rpm and 100 ipm.
 
__ True
__ False

For the answer key, click here.