III. Question for Drilling (20 pts) 1. It is a machining operation, where the wo

Question

III. Question for Drilling (20 pts) 1. It is a machining operation, where the workpiece is fixed while the cutting tool is in rotation. a. Miling b. Turning c. Drilling d. Metrologye. N/A 2. It is the operation that consists in enlarging the holes a. Threading b. Tapping c.Miling d. Reaminge. N/A 3. In the drilling the diameter, depth and time are parameters to determine... c. ft d. N/A e. MRR a. 4. Calculate the MRR in a drilling process that is done with a 3/8-inch radius drill bit, in one piece whose dirilling depth is H-3nches and it takes 240 seconds, the hole is through. (Note: The answer units must be in/min, in/Rev, RPM, in/Tooth, in, Min, in 3/min) .0.345 b.0.435 c.0.534 d. 0.1453 e. 0.3154

Explanation / Answer

1)(c)

In drilling operation drill bit is rotated and translated but the workpiece is fixed using clamps.In milling workpiece is translated about rotating cutter.In turning workpiece is rotated by holding in chuck.

2.(e)

None of the options are correct.Threading and tapping are thread generating operations.Milling is metals cutting via making slots and grooves where as reaming is used for finishing a drilled hole.The answer should be BORING!!!!

3)(e)

diameter,depth and time can be used to determine Material removal rate in drilling ie MRR=Volume of material removed/time taken

where volume of material removed=(/4)*d^2*depth

4)(a)

As discussed earlier volume removed=(/4)*d^2*depth=*r^2*depth=*(3/8)^2*(25/8)=1.381in^3

time taken t=240sec= 4min

therefore MRR=1.381/4=0.3452in^3/min.

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