Taig Micro Mill Digital Read-Out (DRO)
Last updated on Tuesday, September 19, 2023 04:17:53 PM Mountain US Time Zone


Taig Micro Mill DRO, Scales, Enclosure, Red Display Filter,
Mounting Brackets, Cabling,
DPU-550 Daughterboard Upgrade

This DRO modification has been
removed for the
mill CNC conversion but the
information has been retained for reference.

Taig Micro Mill DRO

Completed DRO system for the Taig manual mill,
adapted from my Rong Fu
RF-25 modifications.
The L-channel serves as scale mounts while
protecting them from impact, fluid & debris.

All L-channel bracket corners have
been rounded to increase safety.

Pre-DRO Taig mill with 18" table having 12" of travel.
Note the table lock cap-head screw & the pre-mod
long, 3/8" dowel pin hard stop in the center.


The Taig uses one, 12" scale for the X-axis plus
two, 6" scales for the Y & Z-Axes. The smaller,
horizontal-type scale fits best for the space-
restricted, X & Y-axis applications. The SPC
receptacle has been improved over that
shown for the
Taig Z-axis. The socket
now fully encloses the plug when inserted.


Used Function 5 to define & Function 6 to select
tool diameter
offsets for milling the enclosure.
The two-flute, end mill is 1/8" in diameter.
This setup is on my RF-25 mill.

Inside view of the enclosure's bottom-mounted,
 aluminum bracket. This type of enclosure still flexes a little.

Red Display Filter

Adding a deep red filter really enhances the LED display contrast.
Punched five holes that fit over the status LEDs to hold the filter in place.
The holes should be loose so the filter floats in
place & does not warp when the display heats it up.

The five LED indicators have circular (punched) red
filters that are placed into the front enclosure holes.

Mounting Brackets

An upper bracket that both swivels & tilts.
U-bracket was cut from an extrusion.

Bottom bracket detail using an 80/20 extrusion.

The DRO is mounted directly onto the table for
rigidity & serves to isolate it from the mill's column.


The cables run up through holes in the base &
inside the back channels of the 80/20 extrusion.

Black plastic (80/20) inserts are snapped
into the channels to hold the cables in place.

All cable plugs are held in place with a spot of
hot glue. A 100μf, 10v tantalum capacitor was

soldered into each of the battery compartments. I
have the DRO plugged into a APC surge protector.

DPU-550 Daughterboard Upgrade

If desired, the DRO-350 can be
upgraded with the DPU-550 daughterboard &
overlay for enhanced capabilities.


OpenDRO User's Guide Rev 5 
OpenDRO Supplemental Guide 
OpenDRO Software Upload Manual

Taig Micro Mill DRO, Scales, Enclosure, Red Display Filter,
Mounting Brackets, Cabling, DPU-550 Daughterboard Upgrade