![]() While cutting gear a forming tool is used. The periphery of a gear blank is divided, and equally spaced grooves are cut using an index plate having proper hole circles. After the first spline is cut, the work is rotated through a predetermined amount by using the index plate and index pin. The work is placed between two centres, and a spline is cut similar to the cutting of a keyway. ![]() This types of shaper machine operations done by using an index centre, illustrated in a gear or equally spaced splined may be cut. Lubrication is necessary on the work to prevent the cutting edge of the tool form wear due to dragging. The clapper block is locked in the clapper box to prevent the tool from lifting during the return stroke. Some of the applications of the Quick return mechanism are as follows:- Shaper machine Slotting machine Mechanical actuators Rotary internal combustion engine. Internal keyways are cut by holding the tool on a special tool holder so that the tool post will not hit against the work at the end of the stroke. The quick return mechanism is mostly used in machines where the cutting speed is necessary only in the forward stroke while the speed of the return stroke is not considerable. The speed is reduced while cutting keyways. The length and position of stroke are carefully adjusted so that the stroke will terminate exactly at the clearance hole. ![]() This is important to leave clearance on the tool at the end of the stroke. The work is attached in the vice or directly on the table and the surface to be machined is carefully aligned with the axis of the ram. Machining Vertical SurfacesĪ vertical cut is made while machining the end of a workpiece, squaring up a block or cutting a shoulder. If otherwise, the tool will be weakened and subjected to under strain. The vertical slide of the tool head should not be made to overhang too far below the ram. The tool should be held vertically in such a way that its cutting edge points in a direction slightly away from the work, as moves, due to the cutting pressure, it will move away from the work instead of digging into it.Īnother precaution to be taken in tool set is that its cutting edge should not be projected much below the tool holder. If more material is to be removed, the procedure is repeated until the desired surface is obtained.Ī special precaution is required in setting the tool for horizontal cutting. After the cut is finished, the machine is stopped and the work inspected. Crossfeed to the table is given initially by hand until the cut starts.
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