The Vertical Mill Head - 1: Parts of the Vertical Mill Head
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.
Read this text and see if you can locate the bold words with the image shown The motor reversing switch is a three position forward-reverse-off switch for the motor. There will be many cases when you will have to change the rotational direction of the spindle, so it is imperative that you know which position is forward, reverse and off. Off is almost always straight up. Not all machines have a main power switch like the one shown in the photo. With the main power off the motor reversing switch has no function. The brake is used to halt rotation of the spindle after powering off. Make sure the brake is properly adjusted so it does not apply braking friction during normal operation. The quill feed selector allows the operator to select (typically) between three feeds that will give the quill a controlled upward or downward movement. The values of these three feeds are usually found on a nameplate located next to the quill feed selector.
The micrometer adjusting nut sets the maximum depth for quill feed. The feed reversing knob sets the direction of the feed. If it is pulled out it usually sets a down feed. If it is pushed in it usually sets an up feed. A neutral position in between is no feed. When not in use this knob should be in the middle position where no movement will occur. The feed control lever is a pressure sensitive clutch which engages the feed operation. The quill stop travels with the quill and when it reaches the hard stop of the micrometer adjusting nut the pressure kicks the feed control lever out, thus stopping the feed. The quill lock clamps the quill in position and eliminates some vibration. The draw bar is used to attach tooling to the spindle.
The transmission engagement crank is the primary shift lever for this mechanical operation. This lever must be engaged or quill feed will not be possible. It is a good idea to return this crank to its neutral position once the job is completed to avoid unnecessary wear on the internal mechanism.

The quill feed handle is used to manually adjust the depth of the quill. It can not be used during automatic quill feed.

The back gear (speed range lever) adjusts the range of the spindle speed between high RPM and low RPM. In effect, the use of the back gear doubles the number of available spindles speeds. It is often necessary to rotate the spindle a few degrees by hand to get the back gear to lock into position. Caution: changing the back gear position reverses the rotation of the spindle! Use your motor reversing switch accordingly.

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