- Why does an N/C programmer need to be concerned with a purchase order?
- What pitfalls can be encountered if an N/C programmer works strictly from the part drawing?
- Why does a customer not have to buy parts that are considerably undersize or oversize when the customer's part drawing did not specify a tolerance?
- What kinds of information that the N/C programmer needs can be found in local and general notes on a part drawing?
- What can an N/C programmer do to assist in visualizing the geometry of complex workpieces?
- Describe the initial decisions that have to be made by the N/C programmer at the outset of the programming process.
- What is the most common method of holding a workpiece on an N/C milling machine?
- What factors must be considered when selecting the N/C machine to be programmed.
- Why do many vises lift the workpiece off the parallels when the vise is tightened? How can the lifting be prevented?
- List the advantages and disadvantages of selecting tungsten carbide cutters over high speed steel cutters.
- Discuss the advantages and disadvantages of 2-flute and 4-flute end mills.
- Why cannot standard (jobbers length) drills be depended on to drill a hole where it is supposed to be?
- How can the location of a drilled hole be assured?
- What purpose is served by boring a hole before reaming it to size?
- For what kinds of machining operations are ball end mills used?
- Why cannot a ball end mill be used for heavy roughing cuts?
- Why should a reamer remove as little material as possible?
- Why should hand taps not be used on N/C machines?
- What provision must be made for chips when tapping a blind hole with an N/C machine?
- What factors must be considered when deciding on a tool change and part change location?
- What surfaces on a casting are usually the first to be machined?
- What are the advantages of climb milling as contrasted to conventional milling?
- What effect can the spiral of the flutes have on an end mill that is not too securely held in the toolholder?
- What effect can a cutter temperature increase have on the accuracy of a surface being machined?
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Updated Jan. 23, 2002
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