If a driver with the right tip thickness is not available, the tip of a driver can be ground to match the screw's slot width, which is not possible with more complicated recesses. Any given tip width is sold in a range of thicknesses the longer shafts usually have the thicker blades. To add to the shortcomings of the slotted head, screwdrivers for slotted screws are usually described by the length of the shaft and the width of the tip the crucial measurement, the tip's thickness, is not given. But when the driver is turned the taper creates a force that tends to push the driver up and out of the screw head. The taper allows the bit to accommodate a slight variation in slot widths and to wedge into the screw, holding it on the driver. The sides of most slotted screwdriver bits are tapered.The driver can engage the head in only two possible positions, at 180° to each other.Alternative designs help the user keep the axis of the screwdriver aligned with the axis of the screw. A screwdriver does not automatically line up with the slot it is easy to get off center.Otherwise the slotted head is the worst screw drive system, and is generally obsolescent in industry, largely because it is utterly unsuited to automated driving. a new slot can easily be cut with a hacksaw.cleaning a painted-over slot is easier than cleaning out more complicated.Grinders and other tools available in most workshops. driver tips the same size as the slots can be created using files,.most people have a screwdriver that fits them (sort of).Some advantages of the slotted head are that: Using a slot in a screw’s head to turn it is an old idea: drawings from the 16ᵗʰ century show screws with slotted heads.
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