How are the encoders wired?

See the circuit diagram below.

Can I extend the encoder wires or put switches on them etc.?

Yes. Keep the length to 10 feet maximum for reliable operation. Switches in the lines are no problem.
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Can I “Y” two sets of encoders (lathe and mill) together and connect them to one readout?

No, this won’t work; you’ll have to remove them and swap them.
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Is there a point in the circuit where I can tap off serial data, RS-232, etc. to input to my computer?

No, there isn’t such a point, and it wouldn’t be possible to do with the existing design.
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I notice the X-axis reads “backwards.” Is it possible to change this?

Yes, it’s simple to reverse any axis if you’re handy with a soldering iron. You reverse the black and green wires at the encoders. Details are included in the latest revision of the manual on the website.
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I moved the display to the top of my speed control housing as suggested in your tips section and the display contrast is worse, but it’s hard to see, can this be adjusted?

Yes, there is a contrast potentiometer on the board on the opposite side of the board from all the connections. Adjust it slowly while looking at the display in the position you’ll use it.
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If I have a CNC machine and I mount the encoders on the back of the motor, can the DRO keep up?

Yes, no problem. This has been tested at very high speeds.
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I’d like to modify the DRO software so it will do “X.” Can I get the internal software that it runs?

No, I’m sorry this isn’t possible.
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Can the Sherline encoders and sensors be used with other systems?

Probably, although we can’t give you much support beyond what is already offered in the instructions. The circuit diagrams attached have the components that are on the DRO side of the circuit for the encoders. They are programmed to be used with either a 20 thread per inch or 1 mm pitch leadscrew. Other pitch leadscrews will not yield correct numbers.
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What are the specs for the power connector on the DRO?

It’s a barrel connector with a 5.5mm OD and a 2.1mm ID. Center is positive 9V.
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Circuit Diagrams for Position Sensors

Click on either diagram to view or a larger version of the file.
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How do I remove backlash from the DRO assembly?

The following are instructions for assembling your DRO handwheel on the Z-axis of your lathe. With proper assembly, you will be able to reduce the backlash in your machine to .002″ or less. CLICK HERE to view the PDF instructions.

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I’ve zeroed out my Z-axis by moving the crosslide against the headstock hard stop, but I get an error on my DRO reading when I move the crosslide out and back in. How do I fix this?

There are three possible reasons for this.

    1. You may have excessive backlash.
    2. There may be an error in the DRO handwheel assembly.
    3. The DRO optical sensor may be worn.

CLICK HERE to view the detailed PDF instructions on troubleshooting backlash on a Sherline DRO Lathe.
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