International door slammers has an order to deliver 500 door slammers on day 130. draw up a backward schedule under the following conditions: a. only one machine is assigned to each operation. b. schedule one 8-hour shift per day for 5 days per week. c. all parts are to move in one lot of 500 pieces. d. allow 8 hours between operations for queue and move times. 142 chapter six a slammer consists of three parts. purchased components c and d form sub- assembly a. subassembly a and component b form the final assembly. part b is machined in three operations. no special tooling is required except for part b, oper- ation 20. it takes 24 hours to make the tooling. material is available for all parts. standard times for the lot of 500 are as follows