12″ Deluxe Tabletop Mill w/Ball Screws – CNC-Ready


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2 to 4-week lead time

  • *Preferred unit of measurement for laser engraved portions
    Please note that our ball screws only come in a metric pitch
  • *Will you be using Sherline’s CNC driver box?
  • 15" Column Upgrade
    Replace the standard 11" mill column (4.85" travel) with a 15" column, increasing travel to 8.85" on the Z. 
  • Package Options
    (click magnify icon to view package contents)
  • Available CNC Components
    Optional CNC controllers & stepper motors for the mill. Click on images to view product page
         Mill CNC kit with high-torque motors            High-Torque Stepper Motor

Product Description

About the 12″ Base CNC-Ready Mill with Ball Screws

This machine is based on our popular 12″ Deluxe 5400-series mill. The 12″ mill base with ball screws comes with all-new saddles developed for the ball screws and #23 NEMA frame stepper-motor mounts with high-torque couplings.

The X/Y-mill saddle has been beefed up to accommodate the larger ball screws, and it has an electroless nickel/Teflon coating. This 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 new ball screw design for the column saddle reduces the overall Z-axis travel by 1.4″. Because the ball nut does not allow the column saddle to move down as far as the old style column saddle, we recommend upgrading to the 15″ mill column. This will allow you to move the headstock closer to the top of the mill table. However, you will still lose 1.4″ of overall travel in the Z-axis.

SPECIAL NOTE ON THE COLUMN BED: The new column saddle on the Z-axis is longer, and the headstock mounts towards the bottom of the saddle. We did this because the column saddle Z-axis ball nut mount (P/N 45046) would not allow the original saddle to move low enough to the top of the mill table. Additionally, the P/N 45046 reduces the overall amount of usable Z-axis travel, and the maximum clearance above the table will be 2″ less than that of a standard leadscrew machine. In order to achieve greater travel and clearance above the table, we suggest that you upgrade to the 15″ Extended Mill Column Bed (P/N 45261) if you are ordering a new machine or doing a mill ball screw retrofit. The 15″ extended column bed makes up for the loss of travel in the Z-axis. It is also available with an electroless nickel/Teflon plating (P/N 45265) that adds increased lubricity and rust prevention.

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, so the numeric graduations on the handwheel dials are 2mm per revolution and .02mm per line.

Standard equipment for the model 6854 CNC-ready mill includes:

  • A powerful 90V DC motor with electronic speed controller
  • 12″ base
  • Electroless nickel/Teflon coated mill saddle
  • 13.0″ (330 mm) x 2.75″ (70 mm) table with two T-slots
  • 11″ standard mill column bed (Option to upgrade to a 15″ mill column bed with nickel/Teflon coating is available)
  • Headstock spacer block
  • Stepper-motor mounts with high-torque couplings
  • The handwheels are included and can be mounted to the end of the stepper motors to maintain manual control when needed.* 2-1/2″ (63mm) adjustable “zero” handwheel on the Z-axis and 2″ (51mm) adjustable “zero” handwheels on the X- and Y-axes. Each handwheel has laser engraved aluminum handwheel collars
    *NOTE: CNC-ready machines cannot be operated manually unless double-shaft stepper motors are installed.
  • ¼” 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.
  • Brass leadscrew cover that keeps chips off the rear of the Y-axis leadscrew
  • Accordion way cover

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 PDF Assembly and Instruction Guide

Instructions PDF Download

Download PDF 6854 Exploded View

Instructions PDF Download

Download PDF Ball Screw Mill Unpacking and Assembly Notice

Instructions PDF Download

Download PDF Instructions for Sherline Limit Switches and Mounts

Instructions PDF Download

Download PDF 5920/5958 Ball Screw Way Cover Instructions

Instructions PDF Download

Download Lubrication for Ball Screw Machines PDF

Instructions PDF Download

Download Ball Screw Lubrication PDF

Instructions PDF Download

Max clearance
(table to spindle)
6.875″ (176 mm)
(no spacer)
2.25″ (50 mm)
(w/ headstock spacer)
3.50″ (90 mm)
Travel, “X” Axis 7.8” (198.1 mm)
Travel, “Y” Axis 5.00″ (127 mm)
Travel, “Z” Axis Standard 11″ bed: 4.85″ (123 mm); Optional 15″ bed 8.85″ (225 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
Handwheel graduations .02 mm
Electronically controlled spindle speed range 70 to 2800 RPM
Width Overall 15.375″ (340 mm)
Depth Overall Base footprint: 14.375″ (365 mm); With fully extended brass leadscrew cover: 17.25 (438 mm)
Height Overall (Max.) Standard 11″ bed: TBD” (TBD mm); Optional 15″ bed: TBD” (TBD mm)
Table size 2.75″ x 13.00″ (70 x 330 mm)
Hold-down provision 2 T-Slots
Shipping Weight 60 lb. (27.3 kg)
Movements in addition
to X-, Y- and Z-axes
Headstock rotation (90° left/right)
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