Sharpening of turning tools

After the turning tool becomes dull, it needs to be sharpened to restore the correct shape and angle. Turning tools are generally sharpened on a grinding machine. Use a white aluminum oxide grinding wheel to grind high-speed steel turning tools, and a green silicon carbide grinding wheel to grind carbide turning tools.

When resharpening a turning tool, it is often necessary to grind the corresponding surface of the tool according to the wear condition of the turning tool. The general sharpening sequence of turning tools is as follows: flank grinding, secondary flank grinding, rake grinding, and apex arc grinding. After sharpening the turning tool, each blade surface should be carefully ground with a whetstone. In this way, the service life of the turning tool can be effectively extended and the surface roughness of the workpiece can be reduced.

When sharpening turning tools, pay attention to the following:

(1) When sharpening, hold the turning tool firmly with both hands and press the tool holder against the bracket so that the affected surface is lightly touching the grinding wheel. Do not use excessive force, so as not to damage the grinding wheel and cause an accident.

(2) The sharpened turning tool should be moved left and right on the circumferential surface of the grinding wheel so that the grinding wheel wears evenly without leaving grooves. Avoid rough grinding of turning tools on both sides of the grinding wheel, as this may cause deviation, jump, or even breakage of the grinding wheel.

(3) When the cutting head is hot, it should be cooled with water to prevent annealing and softening of the cutting head due to excessive temperature rise. When sharpening carbide turning tools, the cutting head must not be wetted with water to avoid cracks caused by rapid cooling of the blade.

(4) Do not stand in front of the grinding wheel when sharpening turning tools to avoid injury to the operator if the grinding wheel breaks.

Adjusting various parts of the C6132 (or C616) lathe and using its handles.

The C6132 lathe uses a joystick. Under the polished rod is the spindle open and close handle, as well as the direction change handle. When the handle is up, it is reverse rotation, when it is down, it is forward rotation, and the middle is the stop position.

Adjusting the spindle speed. Different spindle speeds are achieved by the speed change handwheel on the bedside table and the long and short handles on the gearbox. The variable speed arrow transmission line has two positions: low speed | and high speed ||. The long handle has a left and right position, and the short handle has three positions: left, middle and right. They are used in combination with each other to allow the spindle to reach speeds of 28.5 – 1430 RPM. 12 different speeds (see the spindle speed meter on the nightstand for details).

Please note when operating and using:

1) You must stop and change the speed to avoid damaging the gears.

2) If the handle or flywheel plate is not in the normal position, turn the chuck by hand.

3) For safe operation, the rotation speed should not be higher than 360 rpm.

Adjusting the feed amount. The feed size is achieved by changing the gears and changing the position of the two manual transmission lines on the feed box. One of the flywheels has 5 positions. The other flywheel has 4 positions. If the gear shift is guaranteed, these two flywheels can be used together to obtain 20 feed values. Replace with other suitable gears. Different feed amounts are available (for details, see the feed indicator on the feed box).

The clutch handle controls the rotation of the polished rod and the screw rod. Generally, when turning and cutting, use the polished rod and pull the clutch handle outward. When turning the thread, use the screw rod and the clutch handle to push inward.

Using the manual handle: shake the longitudinal manual handle clockwise, the tool rest will move to the right, shake it counterclockwise, the tool rest will move to the left. Shake the horizontal manual handle clockwise, the mast will move forward; shake it counterclockwise, the tool holder will move backward.
When using the automatic handle with a polished rod, when the reversible handwheel is in the “forward” (-) position, lift the longitudinal automatic handle, the tool rest will automatically feed to the left. Lift the horizontal automatic handle, the tool rest will automatically feed to the left. When using the screw, press the handle of the opening and closing nut down, the tool will automatically move to the left to turn the right-hand thread. Everything happens exactly the opposite when playing with the “reverse” (-) position of the reversible handle. When the reversing handle is in the “neutral” (0) position, the automatic vertical and horizontal feed mechanisms are disabled.
Using other handles. If the tool needs to be moved a short distance, a small tool holder handle can be used. When loading and unloading the knife, the square knife holder must be used to lock the handle. Note: The square tool holder must be locked when loading, unloading and cutting. In addition, the tailstock handwheel is used to move the tailstock sleeve, and the handle is used to lock the tailstock sleeve.