I am close "I Think" however:(
Open Mainform +Subform
Add Production data (Date, Machine, Good Parts, Bad Parts..........)
Subform section add (subform linked by Machine) add d/time catagory, mins
EG: 800 good parts & 12 bad parts made on M/C 1, there were 2 down time issues, A-12m & B-10mins...