Question

Reamers usually have an unequal spacing between the cutting edges. * ?What is the reason for this To have a complete flow of chips even out of blind holes. To allow for the regrinding of the reamer as often as required. O To make it possible that reaming could be done with the speed which is used for rough drilling. O To get a high quality of the reamed surface. To make it possible that the same reamer can be used for hard as well O as for soft materials.

heat transfar

Answer 1

1) Answer is option 4, to get the high quality of the reamed surface. in the reamer it is slightly tapping at the end to the top.

1st option is not possible because in reamer there is already complete flow of the chips if there is unequal spacing between cutting edge, because in reamer there is space provide to the chip flow.

2nd option not possible because reamer is made from highly accuracy so we can't perform the regrinding operation because we not get accuracy in the grinding operation.

3rd option drilling operations is rough , for the finishing operations we do reamining so for this operation speed is not very high.

5th option is incorrect because mostly reamer is made up from the harden material so that its use for the soft as well as the hard material.

so that from above discussion we can decide the option 4 is correct option to get high quality of the surface finish.

2) shaping operation is done along the length of the job so that stoke length is defined as the length of the job . so option 4 is correct option.

1st option depth of cut not possible because is shows material removal rate. by using depth of cut we can't predict the length of the job.

2nd option rate of feed it means it show the which rate feed is given to the shaping tool so it's not shows a length of the job.

3rd option speed of motor is not possible because it's show the speed of the shaping tool.

so that option 4 is correct option length of stroke is shows the length of the job.

3)C60B3S23

where, C shows a grain type, 60 shows a grain size, B shows a Grade , 3 shows a wheel structure , S shows a bond type and 23 shows a suffix.

so S is shows a bond type.

so option 1 is correct answer.