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Mill & Lathe CNC Upgrade with High-Torque Stepper Motors (no computer)
Mill & Lathe CNC Upgrade with High-Torque Stepper Motors (no computer)

Product #: 8776
Price: $1,065.50

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If you wish to purchase a Sherline CNC mill, but you want to use your own computer and software instead of Sherline's computer with pre-loaded LinuxCNC software, this package makes it easier. Here's what you do:

1. Order the CNC-ready mill and lathe of your choice.
2. Order this kit (4-axis driver box and connecting cables plus power supply and 5 High-Torque Stepper Motors).
3. Supply your own computer and monitor.

NOTE: If you want a complete plug-and-play system with a lathe, computer, and driver ready to run, see the complete CNC systems page here and here.

Included Components

  • Driver box with 4 motor cables
  • 3.7 amp, 24 volt power supply with cord
  • 25-pin parallel cable
  • 2 CD set with Linux/EMC2, utilities and instructions
  • Five spare fuses
  • 5 High-Torque Stepper Motors

NOTE: A 25-wire parallel port is required because LinuxCNC is designed to be capable of running up to six axes simultaneously. Even though the Sherline driver box only uses four of those axes at one time, a 2-wire serial USB port cannot transmit data to multiple axes fast enough for glitch-free CNC operation.

Minimum Computer Requirements

In order to install and run a Linux based system from the disc provided it is recommended the computer have at least the following minimum specifications:

  • Processor speed: 800 MHz or faster (Pentium III class or equivalent processor)
  • RAM: 512 Mb (Sherline provides 1 Gb)
  • Hard Drive: 20 Gb or larger
  • 25-pin parallel port (printer port)
  • (Laptop computers are not recommended.)

For the most current information on hardware requirements for LinuxCNC/EMC2 see LinuxCNC Hardware Requirements

Driver Box Specifications

Power Supply        

Input: 100-240 VAC, 47-63 Hz, 3A (automatically adapts to incoming voltage)

Output: 24 VDC, 4A

Parameters Logic high levels should be greater than 2 volts.
Logic low should be less than 1/2 volt.
Step pulses are active low.
Step pulses should be at least 22 microseconds long.
The lines labeled as LinuxCNC inputs or outputs can be disregarded in other systems.
For use with software other than LinuxCNC, make sure your software addresses the correct I/O lines for step and direction as shown below.
Sherline is not able to provide assistance for other programs. For help with the LinuxCNC software, see
We recommend at least an 800 MHz Pentium class computer or faster for use with the frequency mode.
In operation, the power to the motors will be reduced to half current after 3 seconds of inactivity. This can be changed to 1/4 power with a jumper on H1.
DB25 pin out

1 – Input from LinuxCNC (may be ignored in other systems)
2 – X Direction
3 – X Step
4 – Y Direction
5 – Y Step
6 – Z Direction
7 – Z Step
8 – A Direction
9 – A Step
10 – NC
11 – Output to LinuxCNC (may be ignored in other systems)
12 – Output to LinuxCNC, XYZ home (may be ignored in other systems)
13 – NC
14 – Input from LinuxCNC, C1 (may be ignored in other systems)
16 – Input from LinuxCNC, C2 (may be ignored in other systems)
17 – NC
18-25 – Ground.

Headers on PC board      H1 – Will reduce current to 1/4 after 3 seconds
H2 – Unimplemented H3 – Will remove power from drivers immediately (panic stop)
RESET – Will hold the drivers in reset condition
Motor Connectors                                     

5-pin DIN male

Five to 30 volts (better performance at higher voltage)
2 amp unipolar configuration
800 steps per revolution (microstepping), equates to 16,000 steps/inch with .050″ pitch leadscrew

High-Torque Stepper Motor Specifications

Frame size NEMA #23
Shaft 1/4″ diameter, dual shafts
Holding Torque

1.35 N.m (Newton meters)
13.756 kg-cm (kilogram centimeter)
191.17 oz/in (ounce inch)
11.948 in/lb (inch pound)

Axial-Force Fa=15 N Max., or 3.37 lbf Max.
Radial-Force Fr=75 N Max., or 16.86 lbf Max.
Rotor inertia 480 g-cm2
Voltage 4.5 V DC
Current 2 A
Step Angle 1.8° (200 steps/rev)

Linux vs. Windows

The software that comes with this package includes Linux and LinuxCNC (formerly EMC) on DVD-ROM. CLICK HERE to learn more about the advantages of Linux and how it compares to Windows. Please read this if you are unsure about your ability to install Linux yourself on your own computer.

For Windows® Users Only Now available for Window 10, 32b and 64b through DPP

dPP offers two ways to connect your own laptop or desktop via the USB port with Sherline’s CNC Controller (P/N 8760). You can use the USB CNC to LPT motion controller dedicated to MACH3 software, or you can get their new controller that features the ability to switch between MACH3 and MACH4. The main difference between the two softwares is that the MACH3 license is less expensive and easier to use for the hobby market, while MACH4 caters more to the industrial market.

These products contain a microprocessor, which simulates a complete CNC controller program and thus elevates the processing load from the host computer.

For prices, features, and specifications click on the links below:
For details on the MACH3 controller, CLICK HERE
For details on the dual MACH3-MACH4 controller, CLICK HERE



Download PDF 8760 Instructions

Instructions PDF Download

Download PDF 67126 Instructions
Instructions PDF Download
Download PDF Removing Stepper Motors
Instructions PDF Download



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