Drilling, Shaping, planning & Grinding Machines Fundamentals

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1 Drilling, Shaping, planning & Grinding Machines Fundamentals

2 Drilling Machine Fundamentals

3 Drilling - An Introduction Drilling is a machine operation used to create a round hole in a work-part. Notice the difference between Boring and Drilling. Boring is used to enlarge an existing hole. Drilling is performed with a rotating cylindrical too ( called a drill or drill bit) that has two cutting edges on its working end. Two types of holes may be generated, Fig. 1. Dr. Amr S. Fayed Page 3

4 Drilling - An Introduction Figure 1: Two hole types Dr. Amr S. Fayed Page 4

5 Operations Related to Drilling Several operations are related to drilling. Most of the operations follow drilling; a hole must be made first by drilling and then followed by one of the other operations. All of the operations use rotating tools. Dr. Amr S. Fayed Page 5

6 Operations Related to Drilling a) Reaming. It is used to slightly enlarge a hole, to provide a better tolerance on it diameter, and to improve its surface finish. The tool is called reamer and it usually has straight flutes. b) Tapping. This operation is performed by a tap and is used to provide internal screw threads on an existing hole. Dr. Amr S. Fayed Page 6

7 Operations Related to Drilling c) Counterboring. It provides a stepped hole, in which a larger diameter follow a smaller diameter partially in the hole. It is used to seat bolt heads into a hole so the head do not protrude above the surface. d) Countersinking. It is similar to counterboring, except that the step in hole cone-shaped for flat head screws and bolts. Dr. Amr S. Fayed Page 7

8 Operations Related to Drilling e) Center Drilling or Centering. This operation drills a starting hole to accurately establish its location for subsequent drilling. f) Spot Drilling. It is similar to milling. It is used to provide a flat machined surface on the workpart in a localized area. Dr. Amr S. Fayed Page 8

9 Types of Drill Presses Upright Drill Bench Drill Radial Drill Gang Drill Multiple Spindles Drill Numerical Control Drill Press Dr. Amr S. Fayed Page 9

10 Types of Drill Presses Dr. Amr S. Fayed Page 10

11 Types of Drill Presses Dr. Amr S. Fayed Page 11

12 Work Holding 0n Drill Presses Vise. A device possessing two jaws that grasp the work in position. Fixture. A device that is designed for a particular workpiece (higher accuracy in positioning the part relative to the machining operation, faster production rates) Jig. A device similar to the fixture but the jig provides a means of guiding the tool during the drilling operation. Dr. Amr S. Fayed Page 12

13 Relative Motions for Drill Presses Both cutting motion (CM) and feed motion (FM) comes from the rotation and linear movement of the tool respectively. Dr. Amr S. Fayed Page 13

14 Shaping & Planning Machines Fundamentals

15 Shaping & Planning Machines Shaping and planning are similar operations. Cutting tools used in both operations are single-edge cutting tools to create a straight and flat surface. Interrupted cutting occurs in them, subjecting the tool to an impact loading upon entry into the work. These machines are limited to low speeds due to their startand-stop motion. High-speed steel cutting tools are recommended. Dr. Amr S. Fayed Page 15

16 Shaping Machine Dr. Amr S. Fayed Page 16

17 Planning Machine What are the cutting and feed motions of it? Cutting motion is the table (workpiece) Feed motions is the tool Dr. Amr S. Fayed Page 17

18 Relative Motions in Shaping & Planning Machines Note the main differences between shaping and planning machines. Dr. Amr S. Fayed Page 18

19 Grinding Machine Fundamentals

20 Grinding Machine (Surface Grinding) Dr. Amr S. Fayed Page 20

21 Grinding Machine Dr. Amr S. Fayed Page 21

22 Grinding Operations Applications: For better surface finishing better accuracy or close tolerances For hardened materials Very little metal removal Cutters: Grinding wheels Machines: Surface grinding machines ( for flat or formed profiles) Cylindrical Grinding machines Universal grinding machines Dr. Amr S. Fayed Page 22

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