Tools and Equipment

IE 1225 Lab “4”

Objective:

Learning how to use the Vertical Milling Machine to perform simple machining operations. In addition we will study the ability to produce acceptable holes and angled features using conventional setup means and tools available on our milling machines.

Tools and Equipment:

Engineering Calculator“Read Rite” 0.0005” Dial Indicator

3” x 4+” x 3/8” Aluminum Blank Drills (15/64”, ¼”, ½”, Center Drill)

“Bridgeport” Vertical Milling Machine0.249” Reamer

Universal Milling Vise Jacob’s Chuck and ½” drilling Collet

Roughing Dial Indicator Parallels

0.200” Edge Finder Vise Spacer

ScribeOptical Comparator

Cadillac Gage & Transfer Indictor (0.0001”)

Procedure:

Square up Vise. Mount the Al-Plate in the vise (long edge down) and machine the aluminum plate to outside dimensions using a face milling procedure -- two operations, one on each side. After this is completed, clamp the work piece in the vise on parallels and machine to length -- two operations. Once part is cut to outside dimensions, set datum reference for holes using the 0.200” edge finder. Now make the three holes. For the “small” hole, drill and ream after center drilling the initial position. For the “loose hole” drill the hole with a ¼” drill after moving into position. For the large hole, position, center drill then drill using a ½” drill held in a drilling collet.

Once holes are drilled calculate position for the angled edge. Mark the work and rough saw the angled portion. Using a “read-rite” dial indicator and the rotational base of the vise, load the part in position in the vise. This positioning requires the use of the Vise Spacer. Once loaded your team can cut the required side to the specification designated for the angled feature using 1/2” or 3/8” end milling – employ both a roughing and finishing operation. For these steps, trigonometric formulae, using the 28.5 angle, will be important! To set up the Vise, use the indicator and a “long leg” of 2.5” to 3” and use the Digital Read Out on the mill to get the angle “Dialed” in. Once your angle is correct, Find the ½” hole’s center using the dial indicator. With the hole center set and the diameter accurately measured – (small hole gage), determine the X-offset from the hole center to the target milling line. Compensate for the size of the end mill and perform a roughing cut approximately 0.010” from final dimension. Finish mill to size.

After completing the machining processes measure and record each of the designated dimensions. Discuss the processes and your team’s ability to perform the processes in your lab notebook and the lab write-up. Turn in your measurement report and a description of the measurement operations performed.

Inspection Table:

A: ______

B: ______

C: ______

D: ______

E: ______

F: ______

G: ______

H: ______

I: ______

J: ______

K: ______

L (ANGLE): ______