What aids accuracy and repetition during manufacture
A jig
A template
CAD
CAM
Jig
A jig aids accuracy or repetition during manufacturing as it gets products 100% identical
Templates
Templates are good to draw around to get the same outline for cutting
CAD
It can large scale design numerous identical products to a high accuracy
CAM
Produces identical, high accuracy products from CAD
Tolerance
Tolerance is a small measurement difference either side of a measurement that is acceptable
500 mm line
Tolerance could be accepted: