Please i need help with the following question if you could

Please i need help with the following question, if you could please be as detailed as possible because i don\'t understand it at all

How would we dimension a hole size so the machinist aims for Least Material Condition (LMC)

When creating a hole is it easier for machinist to aim for LMC or MMC? and why?

How do you know the shape of tolerance zone produced by convention and geometric tolerance

why is the geometric tolerance zone .028 VS +- .01 for conventional tolerance

What does it mean when MMC modifier is added to datum.

Solution

If the prime aim is a Least Material Condition (LMC), the hole size should be maximum, within the allowable dimensions.

When creating a hole, it is very rare to go for LMC, as enough thickness needs to be ensured between edge and internal surface of the hole. On the other hand, MMC ensures greatest amount of material is left. So to answer your question, choce of MMC or LMC will be guided by the funnction and size of the hole. If its too big, does it interfere with the structural integrity of the part? If no, we can go for LMC. If it interferes, go for MMC.

When a modifier is added to the MMC, geometrical tolerance is added on the datum feature of the size is added MMC size.