Question: A CNC machining center has a programmed cycle time = 25.0 min for a certain part. The time to unload the finished part and load a starting work unit = 5.0 min.
(a) If loading and unloading are done directly onto the machine tool table and no automatic storage capacity exists at the machine, what are the total cycle time and hourly production rate?
(b) If the ma-chine tool has an automatic pallet changer so that unloading and loading can be accomplished while the machine is cutting another part, what are the total cycle time and hourly production rate?
(c) If the machine tool has an automatic pallet changer that interfaces with a parts storage unit whose capacity is 12 parts, and the repositioning time = 30 see, what are the total cycle time and hourly production rate? Also, how long does it take to perform the loading and unloading of parts by the human worker, and what is the time the machine can operate unattended between parts changes?