Optical Encoder Assembly

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About the Optical Encoder

The optical encoder was designed by MASSO to work with Sherline machines in conjunction with the MASSO controller. They designed a compact optical encoder for us that fits perfectly with our machines and our accessories. The optical encoder, speed control wiring, and the MASSO software lets you control your spindle speed with g-code.

The optical encoder comes with the MASSO controller, but if you already have an optical encoder for your mill, you can add another optical encoder for your lathe without having to purchase another controller.

You can also order limit switches for your other machine. CLICK HERE.

What’s Included:

  • Optical encoder kit (optical encoder, mounting hardware, and gap setter)
  • Main Encoder speed control cable and ground cable
  • Speed control cable
  • Tach spindle pulley RPM sticker
  • Mill headstock cable support* (ball screw mills only)
    *NOTE: The headstock cable support ships only with P/N 8769. It is not included with any lathes or leadscrew mills.

Select Your Headstock Option

Be sure to select your headstock option above. The bracket mounts for the standard headstocks are different than the ones that ship with a 3C collet headstock. The standard headstocks included the #1 Morse taper with 3/4 x 14 threads, the 9/16″ headstock, and the ER-16 headstock.

The improper use of machine tools and their accessories can result in serious injury. Before using this tool, thoroughly read the instructions and make sure you understand its proper and safe use.


Always wear safety glasses when operating machine tools.

Download PDF Sherline/MASSO CNC Controller Initial Start Instructions
Retrofit Instructions

Instructions PDF Download

Download PDF Threading and Spindle Speeds/MASSO Conversational Threading Program

Instructions PDF Download

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Installing the Optical Encoder

Setting up the Optical Encoder

Part No. Description Quantity
40340 10-32 x 1″ SHCS and 40660 #10 washers for 3C headstock spacer 2 ea.
40530 5-40 x 3/8″ SHCS 2
40720 10-32 x 1-1/2″ SHCS and 40660 #10 washers for standard headstock spacers 2 ea.
67124 Zip ties 4
68002 5-40 x 3/8″ SHCS 1
68060 Tach spindle pulley RPM sticker 1
87810 Optical encoder 1
87812 Optical encoder cover 1
87813 .129 optical encoder gauge 1
87814 Optical encoder bracket 1
87816 Optical encoder spacer for standard headstock (standard headstocks only) 1
87817 Optical encoder spacer for 3C headstock (3C headstock only) 1
87820 Main Encoder speed control cable and ground cable 1
87830 Speed control cable 1
87840 Mill headstock cable support* (ball screw mills only) 1

*NOTE: The cable support ships only with P/N 8769. It is not included with any lathes or leadscrew mills.


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Most merchandise can be returned within 30 day of the purchase date. A refund will be issued to the original form of payment at the original selling price. View our complete return policy and/or start your return online here.