Some positions in the class occasionally require individuals to work at locations outside Los Angeles a year full-time such as Owens Valley and Mojave areas. Completion of a recognized apprenticeship as a machinist; or Six years of full-time paid experience performing machine shop work; or Completion of a recognized United States Military machinist training program such as the U. Navy Machinery Repairman, U. Marine Corp Machinist, U.
Army Machinist, or U. Air Force Aircraft Metals Technology. NOTES : Applicants who lack six months or less of the required experience may file for this examination. However, they cannot be appointed until the full experience requirement is met. Applicants filing under Requirement Number 1 must submit an apprenticeship certificate or card at the time of filing. Applicants may attach the completed Verification of Work Experience VWE form to their on-line application at the time of filing or will have 7 calendar days from the submittal of their on-line application to deliver the VWE form to the Personnel Department Building, E.
Applicants who fail to submit a copy of their VWE form within the time required will not be considered further in this examination and their applications will not be processed. Applicants filing under Requirement Number 3 must submit a U. Applicants must attach a copy of their apprenticeship certificate, U. If these documents are attached after the on-line application has been submitted, they will not be available to the City and the applicants will not be credited with having submitted the documents. Applicants who fail to submit their documents at the time of filing by attaching them to the on-line application will not be considered further in this examination.
In some positions, employees will be required to furnish their own small hand tools. Some positions at the Hyperion Treatment Plant may require that employees be clean shaven for use of Self Contained Breathing Apparatus. Some positions in the Department of Water and Power may require climbing and working on foot wind turbines. Based on City policy, before being hired in one of these positions, you may be required to undergo a drug and alcohol screening test.
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The incumbents of some positions in this class may be required to pass an annual or periodic work fitness evaluation to determine their eligibility for continued employment in this class. To request a disability accommodation, please complete the Disability Accommodation Form within 14 calendar days of the submittal of the City application. The teeth of milling cutters may be made for right-hand or left-hand rotation, and with either right-hand or left-hand helix.
Determine the hand of the cutter by looking at the face of the cutter when mounted on the spindle. A right-hand cutter must rotate counterclockwise; a left-hand cutter must rotate clockwise. The right-hand helix is shown by the flutes leading to the right; a left-hand helix is shown by the flutes leading to the left. The direction of the helix does not affect the cutting ability of the cutter, but take care to see that the direction of rotation is correct for the hand of the cutter Figure Saw teeth similar to those shown in Figure above are either straight or helical in the smaller sizes of plain milling cutters, metal slitting saw milling cutters, and end milling cutters.
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The cutting edge is usually given about 5 degrees primary clearance. Sometimes the teeth are provided with off-set nicks which break up chips and make coarser feeds possible. The steep helix produces a shearing action that results in smooth, vibration-free cuts.
They are available for arbor mounting, or with an integral shank with or without a pilot. This type of helical cutter is particularly useful for milling elongated slots and for light cuts on soft metal.
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See Figure The metal slitting saw milling cutter is essentially a very thin plain milling cutter. It is ground slightly thinner toward the center to provide side clearance. Side milling cutters are essentially plain milling cutters with the addition of teeth on one or both sides.
A plain side milling cutter has teeth on both sides and on the periphery. When teeth are added to one side only, the cutter is called a half-side milling cutter and is identified as being either a right-hand or left-hand cutter.
Side milling cutters are generally used for slotting and straddle milling. Interlocking tooth side milling cutters and staggered tooth side milling cutters are used for cutting relatively wide slots with accuracy Figure Interlocking tooth side milling cutters can be repeatedly sharpened without changing the width of the slot they will machine.
After sharpening, a washer is placed between the two cutters to compensate for the ground off metal. The staggered tooth cutter is the most washer is placed between the two cutters to compensate for efficient type for milling slots where the depth exceeds the width. The end milling cutter, also called an end mill, has teeth on the end as well as the periphery. The smaller end milling cutters have shanks for chuck mounting or direct spindle mounting. End milling cutters may have straight or spiral flutes. Spiral flute end milling cutters are classified as left-hand or right-hand cutters depending on the direction of rotation of the flutes.
If they are small cutters, they may have either a straight or tapered shank. The most common end milling cutter is the spiral flute cutter containing four flutes. Two-flute end milling cutters, sometimes referred to as two-lip end mill cutters, are used for milling slots and keyways where no drilled hole is provided for starting the cut.enter
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These cutters drill their own starting holes. Straight flute end milling cutters are generally used for milling both soft or tough materials, while spiral flute cutters are used mostly for cutting steel. Large end milling cutters normally over 2 inches in diameter Figure are called shell end mills and are recessed on the face to receive a screw or nut for mounting on a separate shank or mounting on an arbor, like plain milling cutters. The teeth are usually helical and the cutter is used particularly for face milling operations requiring the facing of two surfaces at right angles to each other.
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The T-slot milling cutter is used to machine T-slot grooves in worktables, fixtures, and other holding devices. The cutter has a plain or side milling cutter mounted to the end of a narrow shank. The throat of the T-slot is first milled with a side or end milling cutter and the headspace is then milled with the T-slot milling cutter. The Woodruff keyslot milling cutter is made in straight, tapered-shank, and arbor-mounted types.
They have teeth on the periphery and slightly concave sides to provide clearance. These cutters are used for milling semicylindrical keyways in shafts.
The angle milling cutter has peripheral teeth which are neither parallel nor perpendicular to the cutter axis. Common operations performed with angle cutters are cutting V-notches and serration's. Angle cutters may be single-angle milling cutters or double-angle milling cutters.
The single-angle cutter contains side-cutting teeth on the flat side of the cutter.
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Double-angle cutters have included angles of 45, 60, and 90 degrees. The gear hob is a formed tooth milling cutter with helical teeth arranged like the thread on a screw. These teeth- are fluted to produce the required cutting edges. Hobs are generally used for such work as finishing spur gears, spiral gears, and worm gears.
They may also be used to cut ratchets and spline shafts. The size of the cutter is specified by the diameter of the circular form the cutter produces. The corner-rounding milling cutter is a formed tooth cutter used for milling rounded corners on workpieces up to and including one-quarter of a circle. The size of the cutter is specified by the radius of the circular form the cutter produces, such as concave and convex cutters generally used for such work as finishing spur gears, spiral gears, and worm wheels.
Formed milling cutters have the advantage of being adaptable to any specific shape for special operations. The cutter is made specially for each specific job. In the field, a fly cutter is formed by grinding a single point lathe cutter bit for mounting in a bar, holder, or fly cutter arbor. The cutter can be sharpened many times without destroying its shape. High-speed steel, stellite, and cemented carbide cutters have a distinct advantage of being capable of rapid production when used on a machine that can reach the proper speed.
In selecting a milling cutter for a particular job, choose one large enough to span the entire work surface so the job can be done with a single pass. If this cannot be done, remember that a small diameter cutter will pass over a surface in a shorter time than a large diameter cutter which is fed at the same speed. This fact is illustrated in Figure The life of a milling cutter can be greatly prolonged by intelligent use and proper storage. General rules for the care and maintenance of milling cutters are given below. The shank is made to fit the taper hole in the spindle while the other end is threaded.
The milling machine spindle may be self-holding or self-releasing. The self-holding taper is held in the spindle by the high wedging force. The spindle taper in most milling machines is self-releasing; tooling must be held in place by a draw bolt extending through the center of the spindle. Arbors are supplied with one of three tapers to fit the milling machine spindle: the Standard Milling Machine taper, the Brown and Sharpe taper, and the Brown and Sharpe taper with tang Figure The Standard Milling Machine Taper is used on most machines of recent manufacture.
These tapers are identified by the number 30, 40, 50, or Number 50 is the most commonly used size on all modern machines.