External Encoder for Acorn CNC Control

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About the External Encoder for Acorn CNC Control

The External Encoder works with the Sherline/Acorn CNC Controller with a spindle control isolator board. Customers interested in a controller upgrade for their current CNC machine and already have a Sherline Linux PC or a 4-axis driver box need to purchase the external encoder that fits their headstock (standard M1 or 3C). Select your headstock pulley option in the dropdown menu above.

Headstock Pulley Options

  • P/N 9402 – For use with the standard Morse #1 headstock. The main spindle pulley has one high-speed pulley groove and can be used with the Standard Lever Collet Closer.
  • P/N 9404 – For use with the 3C headstock. The main spindle pulley has high-speed and low-speed (high-torque) pulley grooves and can be used with the 3C Lever Collet Closer.
  • P/N 9406 – For use with the standard Morse #1 headstock. The main spindle pulley has high-speed and low-speed (high-torque) pulley grooves. However, it cannot be used with a Lever Collet Closer.

Ordering the Encoder Mounting Kit without an Encoder

You can order the Encoder Mounting Kit and Pulleys without an encoder if you prefer to supply your own encoder. Just select “None” in the Encoder Option dropdown menu above.

For customers supplying their own encoder, there are two parts to consider.

  1. P/N 67112 – Encoder Mounting Plate. This part is designed to work with the encoder that we supply. Below is a downloadable PDF showing the mounting hole dimensions. If your encoder has different mounting holes, you will need to either modify our mounting plate or make your own.
    Download the 67112 Encoder Mounting Plate Diagram
  2. P/N 67113 – Encoder to Cog Pulley Shaft Adapter. Our encoder has a 6 mm diameter shaft. If your encoder shaft is a different size, then you will either need to modify our part or make your own.

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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.

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Always wear safety glasses when operating machine tools.

Download the PDF 9402 instructions, Installing the External Encoder on a Sherline Headstock

Instructions PDF Download

Download the Sherline/Acorn Spindle Speed-Control information

Instructions PDF Download

External Encoder for Standard Headstock P/N 9402 & P/N 9406
Part No. Description Quantity
43230E* Main Spindle Encoder 1-speed Pulley for a Standard Headstock (for use w/Lever Collet Closer) 1
43231E** Main Spindle Encoder 2-speed Pulley for Standard Headstock (for use w/o Lever Collet Closer) 1
67119 Flat Head SH 5-40 x 5/8″ 4
43220E 30T Spindle Cog Pulley for Encoder for a Standard Headstock 1
43240E Encoder Cog Pulley Shoulder Washer 1
67110 Encoder Bracket 1
40330 10-32 x 5/8″ SHCS 2
40660 #10 Washer 2
67112 Encoder Mounting Plate 1
94001 External Incremental Rotary Encoder 1
94005 30-Tooth XL Series Lightweight Timing Belt Pulley 1
94006 XL Series Timing Belt 120XL025, 12″ OD 1
94010 18-8 Stainless Steel Button Head Hex Drive Screw, 10-32 Thread Size, 1/2″ Long 2
94011 Steel Phillips Flat-Head Screws, M3 x 0.5 mm Thread, 12 mm Long 3
67113 Encoder to Cog Pulley Shaft Adapter 1
40520 10-32 x 3/16″ Cup Point Set Screw 1
31080 10-32 x 3/8″ set screw 2

* Available with P/N 9402 only (1-speed pulley for use w/LCC)
** Available with P/N 9406 only (2-speed pulley for use w/o LCC)

External Encoder for 3C Headstock P/N 9404
Part No. Description Quantity
43234E 3C Spindle Encoder Pulley with additional 5-40 holes for a 3C Headstock 1
67119 Flat Head SH 5-40 x 5/8″ 4
43233E 30T Spindle Cog Pulley for Encoder 1
43240E Encoder Cog Pulley Shoulder Washer 1
67110 Encoder Bracket 1
40330 10-32 x 5/8″ SHCS 2
40660 #10 Washer 2
67112 Encoder Mounting Plate 1
94001 External Incremental Rotary Encoder 1
94005 30-Tooth XL Series Lightweight Timing Belt Pulley 1
94007 XL Series Timing Belt 13″ x 1/4″ (130xL025) 1
94010 18-8 Stainless Steel Button Head Hex Drive Screw, 10-32 Thread Size, 1/2″ Long 2
94011 Steel Phillips Flat-Head Screws, M3 x 0.5 mm Thread, 12 mm Long 3
67113 Encoder to Cog Pulley Shaft Adapter 1
40520 10-32 x 3/16″ Cup Point Set Screw 1
31080 10-32 x 3/8″ set screw 2

Download PDF Diagram of the Acorn to External Encoder Wiring Schematic