9.3 PRACTICE PROBLEMS

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1. A 2" diameter milling cutter with 8 teeth has been selected. What is the table feed if we are milling at 80 ft./min. with a tooth load of 0.004"/tooth?

2. Calculate the machine tool spindle speeds for the following,

a) milling with a 3/4" high speed steel cutter in tool steel work. The CS is 60 ft./min.

b) milling with a 150mm diameter tungsten carbide tipped face cutter in stainless steel work. The CS is 65 m/min.

3. You are given a block of aluminum (5" by 5" by 5") and you must mill off a 1/16" layer. Using the tables for speeds and feeds, and using the other details provided below, determine a cost for the operation.

Milling cutter - high speed steel

- diameter 2"

- 10 teeth with a tooth load of 0.004" per tooth

- cost for the machine is $20.00 per hours

4. Which of the following statements is true for milling?

a) milling cutters can cut with the face and peripheral teeth.

b) the cutting edge moves opposite to the direction used in lathes.

c) indexing is used to cut rounded surfaces.

d) none of the above.

5. What are the advantages of upcut and downcut milling?

6. Which of the following statements is true for milling?

a) milling cutters can cut with the face and not the peripheral teeth.

b) the cutting edge moves opposite to the direction used in lathes.

c) indexing is only used to cut rounded surfaces.

d) none of the above.

ans. D

7. Given a 3" dia. 8 tooth fly cutter, with carbide cutting points, and a steel work piece, recommend, a) RPM, b) feed.

8. Given a 6" dia. high speed steel arbor mill with 10 teeth, that will be cutting cast iron work, recommend, a) RPM, feed.

9. Calculate the indexing required when would be cutting a gear with 36 teeth? Use one of the Brown and Sharp indexing plates.

10. Determine the angular indexing required (on Brown and Sharp, and Cincinatti Standard plates) if we want an angle of 23°30'.