Name: Optical Encoder Assembly
SKU: 28642
Availability: InStock

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 let 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.

NOTE: The MASSO optical Encoder is designed to work with the MASSO controller. This encoder may not work with other controllers or control boards. If you intend to use this encoder with a different control or control board, send the information below to the controller manufacturer so they can verify whether this encoder will work with their product.

Optical Encoder Specifications

Below is the information for the MASSO optical encoder, which comes from the MASSO website:

Buy Optical Encoder https://www.masso.com.au/product/optical-encoder/
MASSO Optical Encoder https://docs.masso.com.au/wiring-and-setup/setup-and-calibration/masso-optical-encoder

As stated in the MASSO manual, the MASSO encoder is an optical quadrature encoder.

MASSO Encoder Voltage Range: 12 to 24VDC

Output signals: 0v for LOW signal, 10v for HIGH signal.

An incremental encoder is used to monitor spindle RPM and also for synchronized threading on lathes.

Pin No.	Description	Type
Pin 1	Signal A	Opto input (5 to 24v)
Pin 2	Signal B	Opto input (5 to 24v)
Pin 3	Signal Z – Index	Opto input (5 to 24v)

Spindle Encoder Signal

The A & B signals are Quadrature signals, i.e. 90 degrees out of phase with one another. MASSO can use these signals to determine the speed and direction the spindle is turning.
The A, B signal sequence runs as follows.

A – High, B – Low
A – High, B – High
A – Low, B – High
A – Low, B – Low

The sequence repeats. The sequence will reverse if the spindle is run in the opposite direction.

Upgrading the Spindle Encoder on MASSO G2 (https://docs.masso.com.au/wiring-and-setup/setup-and-calibration/upgrading-the-spindle-encoder-G2)

The maximum pulse frequency on encoder inputs for MASSO G2 controllers is 8 kHz. The MASSO G2 can be upgraded to 20Khz by replacing the Encoder Optocouplers. For more information on this, please click on the “Ordering the SFH615A Optocouplers” link below.

By default, MASSO can take up to 8 kHz encoder signals, to upgrade the inputs so that they can take up to 20 kHz, please follow the below procedures.
To check the maximum frequency as per your machine spindle RPM and encoder PPR, please use THIS CALCULATOR (https://www.masso.com.au/test-page/)
If the calculated frequency is under 8 kHz, then you do not need to do the modification.
Ordering the SFH615A optocouplers: https://www.digikey.com/product-detail/en/isocom-components-2004-ltd/SFH615A-2X/SFH615A-2X-ND/5037024

Machine Type
Leadscrew Type
Headstock	Clear selection

Part No.	Description	Quantity
40340	10-32 x 1″ SHCS and 40660 #10 washers for 3C headstock spacer	2
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
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

Optical Encoder Assembly

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