Monarch Lathe

The Monarch is a very good machine. It is the most rigid and its Digital Read Out (DRO) is the most accurate. However, there are a few complications in using it.

Inserting a Collet

In order to tighten a collet in the monarch, you have to hand-tighten it using the rubber wheel around the spindle. Thanks to friction and leverage, this is not difficult to do. However, you do need to lock the spindle before trying to tighten, otherwise the spindle will just spin instead of tightening. This is done by pushing in and twisting the circular knob above and to the left of the RPM dial. The spindle is locked when the knob doesn't pop out without twisting. In order to lock this knob, you may need to rotate the spindle a bit.

Starting the Machine

The Monarch is slightly more difficult to start. Do the following:

  1. Turn on the circuit breaker. It is located on the wall across from the machine, by the MakerBots.
  2. Turn on the machine. This is down by finding the lever on the bottom front of the machine, and moving its handle to the down position.
  3. Wait 2-5 minutes. The machine needs to warm up some of its circuitry. You'll hear a soft 'click' once this process is complete. If you aren't sure if it is ready of or not, move onto the next step. It will not work until the machine is ready, but it won't do any damage either.
  4. Put the machine into standby mode by pressing the green button. Do not leave the machine in standby mode, without the spindle running, for long periods of time (more than 5 minutes).
  5. Start the spindle by raising the metal lever and pushing it to the left or right.
  6. Stop the spindle by moving the lever back to the center position.
  7. Take the machine out of standby mode by pressing the red button.

The Danger of Standby Mode

The machine is slightly broken. Leaving it in standby mode without the spindle running will eventually cause the circuitry to break. Do not do this. Put the machine into standby mode immediately before running the spindle, and take it out of standby mode immediately after stopping the spindle. The amount of time it takes for something to break is more than a few minutes, so if you're slow or forget for a bit, it won't be a problem.


Lever labeled 1 in the picture, next to the x axis control, controls the auto feed in the x axis.
Lever labeled 2 in the picture, next to the z axis control, controls the auto feed in the z axis.
Button labeled 3 in the picture, controls the direction that the auto feed travels. Currently this button is very hard to change so until further notice, the auto feed direction is not to be changed.


To change the speed of auto feed, follow these steps.
*This is done while the lathe is OFF

  1. Lower the lever labeled 1 by pulling on the silver knob to move it.
  2. Rotate to column with desired speed using the dial under speed chart (labeled 2).
  3. Tighten lever 1 back. If the lever doesn't lock back into place, wiggle the dial 2 a little bit until it does.
  4. Rotate to row with desired speed using the dial on top of speed chart (labeled 3). This dial is only for the first letter. (ex: if you want A-E row, put this dial on A)
  5. Use knob on the bottom right (labeled 4) to get to the second letter of your desired row.

The Threads and Feeds chart on Monarch Lathe has 2 numbers for each entry. The top number is used for threading and the bottom numbers is used for feed rate (in thousandths of an inch).

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