¸ßÅâÂÊÁùºÏ²Ê

Published

Advanced CNC Milling and Drilling Quiz

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

Peter Zelinski
Peter Zelinski
Former Editor-in-Chief, Additive Manufacturing

Share

Leaders-In background
T J Davies, Co., Inc.
VISIT SHOWROOM

T J Davies, Co., Inc.

Since 1965 we have been manufacturing precision metal products in the United States. We are a veteran-founded, woman-led business dedicated to mak...READ MORE

Featured Content
View More
Mikron Corp.
VISIT SHOWROOM

Mikron Corp.

Mikron Machining is the leading partner for high performance machining systems to manufacture complex and precise metal components in high volumes....READ MORE

Featured Content
View More
Featured Videos
View More
SMW Autoblok Corporation
VISIT SHOWROOM

SMW Autoblok Corporation

Featured Content
View More
Featured Videos
View More
Heidenhain Corporation
VISIT SHOWROOM

Heidenhain Corporation

HEIDENHAIN is a world-leading provider of encoders, machine controls, touch probes, digital readouts and metrology solutions—empowering engineer...READ MORE

Featured Content
View More
Featured Videos
View More
CNC Engineering, Inc.
VISIT SHOWROOM

CNC Engineering, Inc.

CNC Engineering, Inc. specializes in enhancing CNC machine tools to boost manufacturing productivity. Our key services include: - CNC Retrofits a...READ MORE

Featured Content
View More
Featured Videos
View More
ZEISS Industrial Quality Solutions
VISIT SHOWROOM

ZEISS Industrial Quality Solutions

Featured Content
View More
Featured Videos
View More
All World Machinery Supply
VISIT SHOWROOM

All World Machinery Supply

All World Machinery Supply is your one-stop shop for machine tool solutions. Machine Tool Spare Parts | Repair Services | Custom Machine Tool Accesso...READ MORE

Featured Content
View More
Featured Videos
View More
QualiChem Inc.
VISIT SHOWROOM

QualiChem Inc.

Featured Content
View More
Featured Videos
View More

(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 .

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

Inverted Milling Offers Power in a Compact Machine
Vertical Machining Centers

Inverted Milling Offers Power in a Compact Machine

To compete in terms of stability and horsepower, Modig’s recent IM-8 mill takes an unorthodox approach: positioning the spindle at the bottom of the work area.

Read More
DN Solutions America Unveils Impressive Chicago Technical Center at IMTS 2024
IMTS

DN Solutions America Unveils Impressive Chicago Technical Center at IMTS 2024

New tech center is serving as a cutting-edge showroom and a technological hub for advanced machining applications.

Read More
Three-Axis Bridge Mill Opens New Doors for Construction OEM
Vertical Machining Centers

Three-Axis Bridge Mill Opens New Doors for Construction OEM

Different industries often require different machining priorities, a truism recently demonstrated by Barbco, an OEM of heavy-duty boring equipment that opened up new design possibilities by pivoting toward rigid, less complex machining centers.

Read More
5 Tips for Running a Profitable Aerospace Shop
Aerospace

5 Tips for Running a Profitable Aerospace Shop

Aerospace machining is a demanding and competitive sector of manufacturing, but this shop demonstrates five ways to find aerospace success.

Read More

Read Next

AMRs Are Moving Into Manufacturing: 4 Considerations for Implementation
Automation

AMRs Are Moving Into Manufacturing: 4 Considerations for Implementation

AMRs can provide a flexible, easy-to-use automation platform so long as manufacturers choose a suitable task and prepare their facilities.

Read More
Machine Shop MBA
Top Shops

Machine Shop MBA

  Making Chips and ¸ßÅâÂÊÁùºÏ²Ê are teaming up for a new podcast series called Machine Shop MBA—designed to help manufacturers measure their success against the industry’s best. Through the lens of the Top Shops benchmarking program, the series explores the KPIs that set high-performing shops apart, from machine utilization and first-pass yield to employee engagement and revenue per employee.  

Read More