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Optical Encoder Assembly
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.
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Always wear safety glasses when operating machine tools. |
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Download PDF Sherline/MASSO CNC Controller Initial Start Instructions
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Download PDF Threading and Spindle Speeds/MASSO Conversational Threading Program
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Download PDF Optical Encoder Mounting Instructions
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Installing the Optical Encoder
Setting up the Optical Encoder
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
| 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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