REAMERS* A reamer is a rotary cutting tool used to enlarge previouslydrilled or bored holes to accurate dimensions.* Reamers may have two or more straight or helical flutes in the body. * There are several different types of reamers. * The main parts of a reamer are the body and the shank I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET 1 E N T D P A R T ME
TYPES OF REAMERS1. M hi Machine reamers2. Hand reamersMachine Reamers :Machine or chucking reamers are available in a wide variety of typesand sizes .These reamers are supplied either with straight shanks or withtapered shanks.1. Rose chucking reamers : considered to be roughing tools and areused where the hole finish and accuracy are not critical.2. Fluted chucking reamers : have more teeth than rose reamers forthe same diameter and are considered to be finishing toolsprimarily. I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET 2 E N T D P A R T ME
Rose chucking reamers Fluted chucking reamers3. Jobbers reamers : have longer teeth than chucklingreamers4.Fluted shell reamers: used for roughing operation a/v in solid and adjustable types I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET3 E N T D P A R T ME
5. The expansion reamer: this reamer can be expanded and resharpened to its original size several times. 6. The adjustable chucking reamer: HSS or Carbide blades can be replaced individually or sets. 7. The Carbide tipped reamer: developed for the need of higher production rates. g p I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET4 E N T D P A R T ME
Hand Reamers : High speed High-speed steel or carbon steel and with straight or helical teeth. 1. Solid-type hand reamers are general-purpose reamers used for most standard hole sizes.Reamer Care1. Never turn a reamer backward at any time, since this will ruin the cutting edges.2. Always store reamers in separate compartments. If stored in the same container, container they must be separated by some suitable material such as cardboard, plastic, or wood.3. Never roll, drop, or place reamers on the metal surfaces of benches or machines.4. Always use the proper speed when reaming.5. Never feed a reamer too fast. This may cause it to jam in the work.6. Use the proper cutting fluid for the metal being reamed.7.7 Never permit a reamer to chatter This will dull the cutting edges quickly chatter. quickly.8. Use helical-fluted reamers for deep holes or holes which have keyways or grooves. I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET 5 E N T D P A R T ME
REAMING FACTORS 1. The type of work material 2. The i idit f th 2 Th rigidity of the setup t 3. The use of the correct cutting fluid 4. The depth of the hole 5. The type and condition of the reamer yp 6. The condition of the machine 7. The type of finish requiredStock AllowanceThere is no definite rule for the amount of stock to be left on the hole diameter forreaming because of the many factors which must be considered.Reaming SpeedThe speed at which the hole is reamed depends mainly on the type of materialbeing machined and the diameter of the reamer. gThe reaming speeds for most materials are about two-thirds of the speed usedfor drilling. I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET 6 E N T D P A R T ME
TAPS # Used to produce internal threads # Th d ill press may b used f either The drill be d for ith hand or machine tapping # Hand tapping is generally used when only pp a few holes are to be tapped. # Machine tapping is preferred when many holes h l must b t t be tapped. d I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET7 E N T D P A R T ME
TYPES OF TAPS (1) Hand Taps : are available in sets containing three taps: Taper, p , Plug, and Bottoming. I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET8 E N T D P A R T ME
(2) Machine Taps : used with power I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET9 E N T D P A R T ME
Tap Drill Size (TDS):INCH :Q. Calculate the tap drill size required for a 1-in. -8 NC thread. I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET 10 E N T D P A R T ME
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 I NE ER I NG ENG T AL EC MECH NIC HNOLOGY A MET11 E N T D P A R T ME
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