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发布日期: Jun 19, 2019
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Advanced CNC Milling and Drilling Quiz

(Text updated February 4, 2019) Ryan Pohl of Praeco Skills developed this test to quickly evaluate students' knowledge of CNC milling and drilling and determine the level of instruction they need. What is your level of knowledge? Scroll down to read the questions and find an answer key or take the quiz interactively here.   Featured Content . How to Make More Money with Vertical Machining CentersHigh Feed Milling Can Reduce Cycle Times 50 PercentWhich Five-Axis Machining Center is Right for You? 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. RELATED CONTENT.Mapping Your Way To Five-Axis Machining. The right route starts with the workpiece, but there are many other considerations. Maximum Aluminum. Speed changes the rules. To maximize metal removal rate with a high speed spindle, follow some fundamental tooling considerations and mill at just the right rpm. Four Types Of Five-Axis Machining Centers. Different machines offer different approaches to rotary travel, and each design has its own strengths. Here's how they compare.