Explain briefly how to cut a 53 teeth spur Gear using different indexing on the milling machine. (2...

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Explain briefly how to cut a 53 teeth spur Gear using different indexing on the milling machine. (2 marks) B ii). When cutting gear on a milling machine, Why is it important to place the gear cutter in the centre of the blank? (4marks) C iii). Briefly explain how helical gear operation is being set up on the milling machine (4 marks) 3 a). Why is it so important that you need to know when calculate a bevel gear two (2) different numbers of gear teeth are to be know? (4 marks) 3b. Find the indexing on the crank handle to turn an angular displacement of XXXXXXXXXXSee below at end of paper sample solution how to work out question 3b. To calculate the angular displacement by using: (i) (ii) converting this to a continued fraction and (8 marks) Tabular method to use for displacement. (8 marks) (om Question 5. Calculate the helical gear for the following: Given data: Z = 37 Teeth Module = 1.5 mm Helical =150 Pressure angle is 20 Calculate the dimensions required for turning and milling a helical gear 15°

Lalit · Accepted Answer

i). 
To cut a 53 teeth spur gear using a milling machine following steps has to be taken:
1. Calculate the gear tooth dimensions for manufacturing
2. Indexing calculation
As the number of teeth can’t be easily divided into the hole plate therefore a differential indexing technique has to be used.
3. The tail stock and dividing head are attached on the machining table with machine.
4. The gear blank is mounted using the mandrel between the tail stock and dividing head of the machine.
5. The cutting wheel is then mounted on the machine and accurately cantering with the gear blank.
6. The speed of cutting and tool feed is set into the machine
7. All the reading in micrometre are reset to zero.
8. The machine is started and feed is given to the cutting tool to cut the first groove of the blank
9.

Explain briefly how to cut a 53 teeth spur Gear using different indexing on the milling machine. (2 marks) B ii). When cutting gear on a milling machine, Why is it important to place the gear cutter...

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