N2 Fitting and Machining Theory|Hands-On! 241
7. What is another name for the indexing head? 8. Wherewould youmount a side and face cutter on a horizontal millingmachine? 9. How many holes do direct indexing plates usually have?
10. What adjustment must be made to a universal dividing head before it is used for rapid indexing?
11. Calculate the indexing in the following cases: a) a gear with 145 teeth b) an angle of 12° 45' c) differential indexing for 99 teeth. State the following: i) indexing required
ii) change gears required iii) direction of rotation of the indexing plate.
12. Show by means of a diagrammatic sketch, a dividing head of a milling machine where the change gears are fixed when differential indexing is done.
13. Calculate the indexing in the following cases a) A gear with 76 teeth. b) An angle of 40° 15’ c) Differential indexing for 99 teeth: (Hint: Choose 90 teeth.) State the following: i) indexing required
ii) change gears required iii) direction of rotation of the indexing plate.
14. Mention three reasons why a helical cutter is equipped with nicked teeth.
15. Calculate the feed in millimetres per minute of a 160 mm diameter cutter with 22 teeth, operating at a cutter speed of 100 meters per minute and a feed of 0,03 mm per tooth.
16. Draw simple line sketches indicating the difference between the following milling processes: a) straddle milling b) gang milling c) slab milling.
17. Draw simple line sketches indicating the following dividing head components: a) the worm b) the worm wheel c) sector arms
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