$37.$ In single point turning, the $\_\_\_$ of the cutting edge affects tool life and surface finish.

$38.$ The optimal width of a parting tool depends on the material $\_\_\_$ and the size of the workpiece.

$39.$ Boring tools with adjustable $\_\_\_$ allow for precise control over the diameter of the bore.

$40.$ The complexity of a form tool's design directly impacts its manufacturing $\_\_\_$ and cost.