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2. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Reamers REAMING IN THE DRILL PRESS tab Reamers are tools used mostly to precision finish, enlarge or align existing holes.Reamers are tools used mostly to precision finish, enlarge or align existing holes. There are two types of reamers: 1.Machine Reamers 2.Hand Reamers

3. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Machine Reamers REAMING IN THE DRILL PRESS tab Fig. H-106 The parts of a machine reamer (Besly Cutting Tools, Inc.). Machine reamers have straight or taper shanks.Machine reamers have straight or taper shanks. –The taper usually is a standard Morse taper.

4. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Common Machine Reamers REAMING IN THE DRILL PRESS tab Fig. H-107 Cutting end of a machine reamer (Besly Cutting Tools, Inc.). The cutting end of a machine reamer is shown.

5. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Common Types of Machine Reamers Chucking reamersChucking reamers are efficient in machine reaming a wide range of materials and are commonly used in drill presses, turret lathes, and screw machines. –Cut on the chamfer at the end of the flutes, usually at a 45- degree angle. REAMING IN THE DRILL PRESS tab Fig. H-110 Taper shank helical flute chucking reamer. Fig. H-109 Straight shank helical flute chucking reamer. Fig. H-108 Straight shank straight flute chucking reamer. Helical flute reamers have extremely smooth cutting action to finish holes accurately & precisely.

6. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Common Types of Machine Reamers Jobber’s reamers are used where a longer flute length than that of chucking reamers is needed. –Additional flute length gives added guide to the reamer, especially when reaming deep holes. REAMING IN THE DRILL PRESS tab Fig. H-111 Taper shank straight flute jobber’s reamer.

7. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Fig. H-112 Rose reamer. The teeth are slightly backed off, making the diameter smaller toward the shank end by about.001 in./in. of flute length. Lands are ground cylindrically without radial relief, & all cutting is done on the end of the reamer. Common Types of Machine Reamers The rose reamer is a roughing reamer used to enlarge holes to within.003 to.005 in. of finish size. –Typically followed by a fluted reamer. REAMING IN THE DRILL PRESS tab

8. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Common Types of Machine Reamers Shell reamers are finishing reamers. –More economically produced than solid reamers because a smaller amount of tool material is used in making them. REAMING IN THE DRILL PRESS tab Fig. H-113 Shell reamer helical flute. Fig. H-114 Taper shank shell reamer arbor. Two slots in the shank end of the reamer fit over matching driving lugs on the shell reamer or box –The hole in the shell reamer has a slight taper of 1/8” per foot in it to ensure exact alignment with the shell reamer.

9. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Common Types of Machine Reamers Morse taper reamers, with straight or helical flutes, are used to finish ream-tapered holes in drill sockets, sleeves, and machine tool spindles. REAMING IN THE DRILL PRESS tab Fig. H-115 Morse taper reamer.

10. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Common Types of Machine Reamers Helical taper pin reamers are especially suitable for machine reaming of taper pin holes. –Free-cutting action produces a good finish at high cutting speeds, and chips do not get packed in the flutes, which reduces the possibility of breakage. REAMING IN THE DRILL PRESS tab Fig. H-116 Helical taper pin reamer. Taper pin reamers have a taper of 1/4” per foot of length and are manufactured in 18 different sizes ranging from number 8/0 to number 10.

11. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Common Types of Machine Reamers Taper bridge reamers are used in structural iron or steel work, bridge work, and ship construction where extreme accuracy is not required. –Long tapered pilot points make for easy entry in the out-of-line holes often encountered in structural work. REAMING IN THE DRILL PRESS tab Taper bridge reamers are made with straight & helical flutes to ream holes with diameters from 1 /4” to 1-5/16” Fig. H-117 Helical flute taper bridge reamer.

12. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Fig. H-118 Carbide-tipped straight flute chucking reamer. Common Types of Machine Reamers Carbide-tipped chucking reamers are often used in production setups, particularly where abrasive materials or sand & scale are encountered. REAMING IN THE DRILL PRESS tab Fig. H-119 Carbide-tipped helical flute chucking reamer, right-hand helix. A right-hand helix chucking reamer is recommended for ductile or highly abrasive materials, or when machining blind holes.

13. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Common Types of Machine Reamers A carbide-tipped left-hand helix chucking reamer will produce good finishes on heat-treated steels up to RC 40. –These reamers should be used only on through holes, as chips push out through the hole ahead of the reamer. REAMING IN THE DRILL PRESS tab Fig. H-120 Carbide-tipped helical flute chucking reamer, left-hand helix.

14. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Fig. H-121 Carbide-tipped expansion reamer. Common Types of Machine Reamers After becoming worn, expansion reamers can be expanded and resized by grinding. –This offsets normal wear from abrasive materials & prolongs long tool life. –They should not be adjusted for size by loosening or tightening the expansion plug, but only by grinding. REAMING IN THE DRILL PRESS tab

15. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Hand Reamers Various types of hand reamers areVarious types of hand reamers are A.Straight fluted B.Expansion C.Adjustable REAMING IN THE DRILL PRESS tab

16. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Speeds Cutting speeds, which generally depend on:Cutting speeds, which generally depend on: –Type of material being reamed. –Amount of stock to be removed. –Tool material being used. –Finish required. –Rigidity of the setup. REAMING IN THE DRILL PRESS tab The reaming speeds for most materials are about two-thirds of the speed used for drilling.The reaming speeds for most materials are about two-thirds of the speed used for drilling.

17. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Speeds REAMING IN THE DRILL PRESS tab Class Activity:Class Activity: Calculate the speed for rose chucking reamer if 12 mm diameter of HSS drill used to make the hole on Aluminum plate and cutting speed is 92m/min?

18. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Feeds Feeds in reaming are usually two to three times greater than those used for drilling.Feeds in reaming are usually two to three times greater than those used for drilling. –Feed varies with different materials, but a good starting point would be between.0015 &.004” per revolution. –Too low a feed may “glaze” the hole, work hardening the material, causing chatter & excessive reamer. –Too high a feed tends to reduce the accuracy of the hole & quality of the surface finish. REAMING IN THE DRILL PRESS tab

19. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Reaming Problems When reamers gradually start cutting larger holes, work material may be galling or forming a built-up edge on reamer cutting surfaces. REAMING IN THE DRILL PRESS tab Mild steel & some aluminum alloys are particularly troublesome in this area. Fig. H-123 Reamer teeth having built-up edges.

20. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Taps Used to produce internal threads.Used to produce internal threads. The drill press may be used for either hand or machine tapping.The drill press may be used for either hand or machine tapping. Hand tapping is generally used when only a few holes are to be tapped.Hand tapping is generally used when only a few holes are to be tapped. Machine tapping is preferred when many holes must be tapped.Machine tapping is preferred when many holes must be tapped. TAPS IN THE DRILL PRESS

21. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 1) Hand Taps : are available in sets containing three taps: (1) Hand Taps : are available in sets containing three taps: Taper,Taper, Plug, andPlug, and BottomingBottoming Types of Taps TAPS IN THE DRILL PRESS

22. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 (2) Machine Taps : used with power 1.Gun taps 2.Stub-flute tap 3.Helical-fluted taps or Spiral-fluted taps 4. Flute less tap Types of Taps TAPS IN THE DRILL PRESS Cutting Action

23. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 INCH : Q. Calculate the tap drill size required for a 1-in. -8 NC thread. Tap Drill Size (TDS): TAPS IN THE DRILL PRESS

24. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Metric Taps Metric taps are identified with the letter M followed by the nominal diameter of the thread in millimeters times the pitch in millimeters. Tap Drill Sizes for Metric Threads The tap drill sizes for metric threads may be calculated by subtracting the pitch from the nominal diameter. T.D.S. = D - P For example: Calculate the tap drill size for an M12 X 1.75 thread. T.D.S. = 12 - 1.75 = 10.25 mm Tap Drill Size (TDS): TAPS IN THE DRILL PRESS

25. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Speeds REAMING IN THE DRILL PRESS tab Class Activity:Class Activity: Calculate the tap drill size for an M10 x 1.25 threads?

26. Machine Tool Practices, Ninth Edition By Richard R. Kibbe, Roland O. Meyer, John E. Neely, Warren T. White © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ 07458 Thank You