Slotted nuts

Light source swivel arm lock. This is a large slotted nut that works itself loose as you move the light source up and down a few times. Always have a dime handy to help you tighten this locking nut when it gets loose. 

Internal socket-type, slotted-nut, or c-type spanner bolting shall not be used unless specifically approved by the purchaser. 

Designed to hold small round or square parts that are to be tapped lengthwise, this fixture grips or releases them by merely moving a cam lever. The body is a piece of tool steel which has two holes drilled an inch or so from each end, after which it is slotted as indicated. The body is mounted on a steel base with a heavy cap screw run through a third hole drilled at the rear end. A hole at the split end takes a bolt which has a lever cam on one end and a lock nut on the other. In use, the fixture is clamped to the drill-press table and the work is placed in the open hole nearest the split end, after which the cam lever is moved to pull the two sides of the body tightly against it. 

The drift may be made of almost any shape, and will produce holes of irregular form as re ily as square ones. Another oxample is the mortice in the loop attached under gun-barrels, through which the bolt passee, and also the same size mortice or slot in pscutcheons, which are let into the stock, through which the same bolt passes. The holes in small lid wrenches to receive square or six-sided nuts can be readily and easily made in the same manner. 

Larger work and sheet metal are best clamped direct on to the worktable, care of course being taken to avoid drilling into the worktable surface. When required, the work can be raised off the worktable surface by means of suitable packing or on parallels. Tee slots are provided in the worktable surface into which are fitted tee bolts, or tee nuts in which studs are screwed. Fig. 8.7. 

Figure 12.8. Locking nuts (a) standard lock nut (b) slotted and castle nuts (c) Nyloc nut(d) Aerotight nut(e) Philidas self-locking nut (f) torque lock nut...

Slotted and castle nuts are used in conjunction with wire or a split pin through a hole in the bolt to prevent the nut from working loose. Fig. 12.8(b). 

A third type, known as a Philidas self-locking nut, Fig. 12.8(e), has a reduced diameter above the hexagon. Two slots are cut opposite each other in the reduced diameter and the metal above the slots is pushed down, which upsets the thread pitch. When screwed in position, the thread is gripped hy the upset portion, preventing the nut from working loose. 

In some cases, there are dimensional variations greater than those which can be accommodated by oversize holes. A solution to that problem is the use of criss-cross slots (Fig. 8.266) in the moldments in conjunction with a nut, bolt, and washers. It should be noted that criss-cross holes are more expensive to tool or machine than roimd holes. 

Slotted and castle nuts are used in conjunction with wire or a split pin through a hole in the bolt to prevent the nut from working loose. Fig. 13.9(b). Self-locking nuts are available which are easy to assemble and do not require a hole in the bolt or the use of a split pin. One type, known as a Nyloc nut. Fig. 13.9(c), incorporates a nylon insert round the inner top end of the nut. As the nut is screwed on, the nylon yields and forms a thread, creating high friction and resistance to loosening. 

Eliminate hand tool feed force. (Consider using weld nuts and the use of hex or torx head rather than slotted or Phillips head screws.)... 

The clamp fixture will only take a few minutes to make. It consists of two end plates, two 6 lengths of 3/8-16 threaded rod and four 3/8-16 nuts with flat washers. Make each end plate from 1/4 X 2-1/2" X 3-1/2" C.R.S. fiat bar. See figure 84. Locate and drill the 3/8" holes located 1/2 back from each end of each plate. Cut out the 3/8" slots in each end with a bandsaw or hacksaw. 

The important elements are a mechanical digester or macerator and a small press. The digester consists of a horizontal barrel fitted with rotating beater arms and operated by a small diesel engine. This breaks up the fruit flesh into a pulp. The oil is extracted from the pulp either in a curb press, in which a heavy metal plate is forced down on to the charge in a perforated or slotted cylindrical container by means of a screw thread turned manually or in a small hand operated hydraulic press. These two devices enable up to 90% of the oil content to be recovered. The nuts are separated manually from the press residue and processed separately. 

The apparatus is illustrated in Figure 7.6. A glass ignition tube is supported as shown in a Wade V4 inch diameter brass coupling nut, covered with a silicone rubber septum and sealed with a Wade V4 inch brass stop-end body. The stop-end body has two 1 mm diameter holes drilled through the cap. The whole unit is placed in a slot in a cylindrical copper block (3 in long x 2 in diam) which is heated by two Bray (240 V, 85... 

Position the heater post on the left rear leg of the machine as shown in figure 101. Position the post so that the slotted hole at the top of the post is approximately centered with the 1/4" hole in the mounting bracket. When positioned, clamp the post to the leg of the machine with a couple of C-clamps. Then, using the 1/4 holes in the post as a template, drill 1/4 holes through the leg of the can. Then bolt the heater post to the cart leg with 1/4-20 x 3/4 bolts, nuts and lockwashers. 

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