Machine Shop 3 - Milling Operations

Step#	Location	Description	Initials	Date
10	Instructor	Use stock from previous turning project.
20	Vertical Mill	Check the vise for squareness using a dial indicator.
30	Vertical Mill	Indicate the vise jaw to within 0.003 inches. Have checked by instructor.	*
40	Layout Table	Layout the 0.500 slot.
50	Vertical Mill	Prepare to cut the slot by placing the part in vise using parallels of the proper height to allow approximately ¼ inch sitting above the top of the vice.
60	Vertical Mill	Using an edgefinder, locate the center of the spindle on the center of the slot. Lock the Y axis table locks.
70	Vertical Mill	Set up a 3/8 inch center cutting endmill.
80	Vertical Mill	Set Rpm and Feed rate for cutting the slot.
90	Vertical Mill	Take a .03 deep cut down the center of the slot using the layout lines as a guide for the length of the slot. Stay approximately 1/32 inch from the layout lines at the ends of the slot.
100	Vertical Mill	Check the location of the center of the slot.
110	Instructor	Have instructor check location. Be prepared to answer questions about table travel and backlash. Check and adjust, if necessary.	*
120	Vertical Mill	Finish rough cutting the slot through the part. Use coolant.
130	Vertical Mill	Place a 0.500 endmill in the spindle. Don’t move the Y-axis now that it is centered in the slot.
140	Vertical Mill	Set Rpm and Feed rate for cutting the slot with ½ inch endmill.
150	Vertical Mill	Have Instructor check your setup and explain how to check the length and location of the slot.	*
160	Vertical Mill	Finish cutting the slot.
170	Vertical Mill	Prepare to cut the radii by placing the part in vise using parallels of the proper height to allow approximately 1/2 inch sitting above the top of the vice.
180	Vertical Mill	Place a 0.25 radius cutting endmill in the spindle. Have instructor explain how to position the cutter to cut the radii. Set speeds and feeds for using a 0.25 radius forming endmill. Have instructor check the Setup.	*
190	Vertical Mill	Cut the radius
200	Vertical Mill	Turn the part over and cut the other radius.
210	Vertical Mill	Set up an edgefinder and locate the position for the drilled and tapped 8-32 UNC hole.
220	Vertical Mill	Center drill and drill the hole.
230	Vertical Mill	Place the taper tap in a drill chuck. Put the spindle in neutral. Start the tap in the hole by hand 3 to 4 threads.
240	Vertical Mill	Drop the table down and finish tapping by hand. Use the appropriate size tap handle and tapping fluid.
250	Bench	Deburr and inspect the part
260	Instructor	Turn in part for grading.	*