lab5b - LAB#5 MACHINING EXPERIMENT III DRILLING BORING AND...

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LAB #5 MACHINING EXPERIMENT III DRILLING, BORING AND REAMING Purpose : To study the operation of drilling, boring and reaming. Machine : Engine lathe Tools: 1” micrometer, telescoping gage set, 6-inch dial calipers, steel ruler, carbide tools. Material: Aluminum bar (approximately 2 inch in diameter) Operations: A. Preparation of the work-piece in the three jaw chuck. 1. Insert the work-piece (from Lab 3) into the chuck and tighten the jaw. You will work on the previously faced end. B. Drilling (see Figure 1) 1. Extend the tailstock spindle with hand-wheel to extend approximately 1" out of housing. 2. Perform center drilling using a #4 center-drill (use 800 rpm for the spindle speed). 3. Clean taper shank of the 1/4" dia. drill and insert it into the tailstock spindle. Note: drill should sit tight in the drill-holder, which in turn should be locked in the tail-stock. Do not lock the tailstock spindle . 4. Using a cutting speed of 50 ft/min and the drill diameter, compute for computation.
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