Purchasing Socket Head Cap Screw And Bolts - Should

WHAT IS GRUB SCREW? Manufactured of hardened metal. The bearing point can have different designs such as cone, oval, flat or cup. Can have various head types. A screw with a bearing point on one tip, with or without a head on the other end. Can cleave to something in place when tightened against a mated surface. SOME HINTS AND TIPS USING GRUB SCREW Screws which remind you of grub screws and function in related ways are generally designed to overcome some of the drawbacks grub screws should not be used, for example, to establish collars which will be subjected to significant end thrust, or to fix gears or pulleys when there is heavy torque to transmit. To use grub screws in such circumstances to invite the risk of collars moving endwise and gears and pulleys twisting on shafts. Common grub screw is as at Al with a point machined at an angle of 120 deg. to make its own indentation in a plain shaft, or enter a drilled hollow. For the hollow, a twist drill can be used, the normal angle for the lips of which is 118 deg. It has the advantage that the shaft is not burred by the end of the screw which can hinder removal of components. There is also positive location of the screw in the hollow, and greater resistance to movement than when the screw is tightened to a plain shaft. It is essential to position a component like an eccentric accurately on a shaft for drilling a dimple or hole, the job can be done . Two blocks should be drilled and bolted together and then bored in the chuck to clamp on the shaft beside the component. If it is an eccentric, it is then set in correct angular relationship to the crank pin and gripped to the blocks by a toolmaker's clamp. TYPES OF GRUB SCREW Grub Screws Typically used to maintain parts such as gears & collars to such as gear shaft. even though grub screws are made with both slotted type and allen head styles, the slotted type is weak therefore Allen type is suggested. Dog Point The tip is usually positioned hooked on a groove in a shaft and allows the shaft to spin at the same time as retaining the component in position. Knurled Cup Point The cup point as it has serrations on its tip and its plane end. knurled cup point is an improvement. Cone Point The pointed tip can either located into a machined depression or it can make and indentation into a softer material. the cone end tip type can be used in a set of two different situations. Better holding power and boost point pressure Flat Point Bottom threads can buckle when the grub screw is tightened which can make dis-assembly tricky. The plane point tip type is the simplest and slightest expensive type accessible and is the one that is most commonly use on model cars. Domed Point There is also an boost in point pressure due to the abridged tip contact area. Domed point tip type is an enhancement on the flat point type in that the threads don't deform upon tightening of the grub screw Cup Point Point tip type is an improvement on the cone point.