Accu-Pro VMC Ball Screw Mill with MASSO Touch Controller


2 to 4-week lead time

CAUTION: The Accu-Pro Mill and Chucker Lathe must be mounted to a work surface, or they will tip when the tables are fully extended.

CONFIGURE YOUR MACHINE: Use the dropdown menus below to configure your Accu-Pro Mill. To learn more about configuring your machine and the available Accessory Packages, click on the Machine Accessories tab below.

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Product Description

About the 18″ Accu-Pro VMC Benchtop Mill System with Ball Screws

This machine is based on our 18″ NexGen 5800-series benchtop mill. The 18″ mill base with ball screws comes with all-new saddles developed for the ball screws. The X/Y-mill saddle has been beefed up to accommodate the larger ball screws, and it has an electroless nickel/Teflon coating. The nickel coating offers a hard surface that is rustproof, while the Teflon provides a friction coefficient of .1-.2u for smoother movement of the saddle and the table. The Accu-Pro Mill also includes 36V closed-loop stepper motors with #23 NEMA frames, motor mounts with high-torque couplings, and C5 bearings in the headstock for smoother spindle operation.

Ball Leadscrew Specifications

  • Rolled Ball Screw with BSH Nut
  • 10mm Diameter, 2mm Lead
  • C7 Accuracy*, P1 Preload
    *C7 accuracy has a linear tolerance of 50 micrometers / 300mm or .002″ / 12.0″.

The ball screws are only available in metric.

About the Sherline/MASSO CNC G3 Touch Controller

The MASSO Touch Controller with power supply and spindle drive card allows you to input data to the controller via a state-of-the-art touch screen. With MASSO, you can write your CNC programs on your computer (Windows, Mac, Linux, etc.) and then transfer your program to the controller via a USB flash drive. No more having to use a dedicated operating system like Linux or Mach 4 to control your machine.

The Touch Controller includes:

  • Industrial cable system from the controller to the machine
  • 36-volt power supply
  • Touch-controller stand

Do you want to know more about the Sherline/MASSO G3 CNC controller? Here are some resource links for your reference.

The 18″ MASSO Accu-Pro VMC Benchtop Mill System Package includes the following:

  • 18″ mill is fitted with ball screws and all-new saddles developed for the ball screws
  • A Sherline/MASSO G3 Touch Controller
  • G-code Spindle Speed Control
  • An optical encoder
  • WiFi is standard with the MASSO G3 Touch Controller
  • Three 36-volt, Closed-Loop, High-Torque Stepper motors with a 70 in/min maximum feed rate
  • Professional cable wraps and covers for the X- and Y-axis
  • IGUS E-Chain flexible cable carrier for the Z-axis
  • MASSO homing sensors on all axes
  • USB 4 GB flash drive (With software, machine settings, sample programs, and PDF instructions included.)
  • 1-year warranty on all machine components for non-production use. 90-day warranty on CNC and electronic controller-related components

Standard equipment for the CNC Benchtop Mill includes the following:

  • A powerful 90V DC motor with an electronic speed controller
  • 18″ base
  • Electroless nickel/Teflon-coated mill saddle
  • 15″ mill column bed with nickel/Teflon coating
  • Headstock with #1 Morse taper, 3/4 x 16 spindle thread with precision C5 bearings
  • Headstock spacer block
  • 18.0″ (457 mm) x 2.75″ (70 mm) table with two T-slots
  • 7″ x 18″ tooling plate with three T-slots
  • Stepper-motor mounts with high-torque couplings
  • 1/4″ Drill Chuck w/ key, #1 Morse arbor with drawbolt
  • Pulleys, drive belt, three hexagonal keys, spindle bars, gib removal tool, eight-foot three-wire power cord, and instruction manual
  • Oil reservoirs on the X/Y axes and the Z-axis to help keep critical parts lubricated
  • Accordion way cover and brass-tube leadscrew cover that keeps chips off of the Y-axis leadscrew

The Axes of Movement of a Sherline 18″ Ball Screw Benchtop Mill.

CNC-ready version shown for reference.
Click on the image for a larger view.

The table left/right movement is referred to as the X-axis. The table in/out movement is the Y-axis. The headstock up/down movement is referred to as the Z-axis. The headstock can also be rotated on its saddle on Sherline mills (#4), the column ram can be moved in and out (#5), and the Z-axis column can be tilted forward and back (#6).


Headstock Options:

Standard #1 Morse Headstock
More info…

ER-16 Collet Headstock
More Info…

Software Options:

Available in 3 or 4-axis. If you are not going to use a rotary table now or in the future, select the 3-axis option. Select the 4-axis option if you are also buying the accessory package with the rotary table. If you are planning on purchasing a rotary table in the future, select the 4-axis software option.

Accessory Packages:

Click on the images to learn more about each Accessory Package.

AP Mill X Package
More info…

AP Mill Z Package
More info…

AP Mill XR Package
More info…

AP Mill ZR Package
More info…

Mill Accessories

Holding Fixtures

Mill Tool Holders

Mill Tools

Rotary Tables

  • P/N 3700-CNC CNC-Ready Rotary Table
  • P/N 3710-CNC CNC-Ready Nickel-Teflon Coated Rotary Table
  • P/N 8720 CNC Rotary Table with 36V Stepper Motor
  • P/N 8730 CNC Rotary Table with Stepper Motor
  • P/N 8731 Nickel-Teflon Coated CNC Rotary Table with Stepper Motor
  • P/N 8700 Rotary Table with CNC Indexer
  • P/N 8711 Nickel-Teflon Coated CNC-Rotary Table Indexer

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 Lubrication for Ball Screw Machines PDF

Instructions PDF Download

Download Ball Screw Lubrication PDF

Instructions PDF Download

Ball Screw Machine Specifications
Max clearance
(table to spindle)
12.875″ (327 mm)
(no spacer)
(w/ headstock spacer)
Travel, X-Axis 12.80″ (325.1mm)
Travel, Y-Axis 11.00″ (279 mm); 8.9″ (226 mm) with the tooling plate attached
Travel, Z-Axis 9.25″ (235 mm)
Hole through spindle .405″ (10 mm)
Spindle nose thread 3/4″-16 T.P.I.
Spindle nose taper #1 Morse
Spindle runout of Morse taper .0005″ or less
Electronically controlled spindle speed range 70 to 2800 RPM
Width Overall* 25.25″ (641.3 mm)
Depth Overall* Base footprint: 26″ (660.4 mm); With fully extended brass leadscrew cover: 33.25″ (844.5 mm)
Height Overall (Max.)* 29.375″ (746 mm)
Table size 2.75″ x 18.00″ (70 x 457 mm)
Hold-down provision 3 T-Slots (with 7″ x 13″ tooling plate)
Shipping Weight 82 lb. (37.19 kg)
Movements in addition
to X-, Y- and Z-axes
Headstock rotation (90° left/right), Column pivot (90° Fwd/Bk), Column travel (In/Out) 5.5″ (140 mm)
Motor 90 volt DC with electronic speed control that accepts any incoming current from 100VAC to 240 VAC, 50 Hz or 60 Hz.
Click here for motor specifications
Spindle Speed Range 70-2800 RPM continuously variable by electronic speed control

*Overall dimensions include motor and speed control

Ball Leadscrew Specifications
Rolled Ball Screw with BSH Nut
10mm Diameter, 2mm Lead
C7 Accuracy*, P1 Preload *C7 accuracy has a linear tolerance of 50 micrometers / 300mm or .002″ / 12.0″.
Stepper Motor Specifications
Sherline/MASSO 36V, Closed-Loop Stepper Motor Specifications and Troubleshooting PDF
Frame Size NEMA #23
Shaft 8mm (.315”)
Input Voltage 36V DC
Output Current 4.5A 20 KHz PWM
Pulses/Revolution 800
Maximum Torque 2 N.m (Newton meters), 20.39 kg/cm (kilogram centimeter), 283 oz/in (ounce inch), 17.70 in/lb (inch pound)
Accu-Pro VMC Mill Cutting Demo Videos
Accu-Pro VMC Mill Instructional Videos

Click on the link for the exploded view of the 696858M Accu-Pro Ball Screw Mill to help identify replacement parts.

If you are still uncertain please call our customer service representatives for help with this item.

If you are working with brass or wood, we suggest you use the toggle switch dust cover to protect the life of your motor & speed control.

The MASSO G3 CNC controller, power supply, stepper motors, cable system and optical encoder are sold as a part of our Accu-Pro line of machines and are not available for purchase separately or as an upgrade option to existing machines.