Adding a DRO the the quill of my milling machine
Addendum of 12/29/2015
having my 12 inch AccuRemote DRO on the shelf for well over a year, I
finally decided to get busy and get it installed so I would have a full
4 axis DRO
system and be able to accurately adjust my quill depth.
struggled a little with the design, as most installations I have seen
partially or totally block the depth stop nuts. I often use
depth stop and did not want to prevent its use. I finally
to firmly mount the DRO body and let the bar move with the quill.
made a clean installation and left the stop nuts totally exposed.
I made a mounting
bracket that used existing bolts plus one new tapped hole to mount the
body. I then made an arbor with an expanding end, to securely
mount to the
moving stop ring. I used a spacer to extend this out to
attach to the movable DRO bar.
This shows the mounting brackets and the arbor driving the DRO bar.
The main bracket
is mounted with two of the original top housing bolts plus a new
stabilizing one near the front.
I allowed sufficient clearance on the mounting holes, and adjustable
nuts mounting the bar to
accurately align the parts. The main mounting bracket is very
stiff, ensuring high accuracy, but
the vertical bracket is quite flexible to allow slight
amounts of auto-alignment.
expanding arbor is a snug fit into the hole on the movable stop ring.
An incompletely taper tapped hole allows a setscrew to expand
tangs and securely lock it in place. An added spacer is
needed to reach the location of the bar. A single part could
been used, but I
have no way to tap a 2 inch deep hole, so I made it in two parts.
shows the finished installation with the quill fully up on the left,
and fully down on the right. The scale readings above the body
the same as the original scale on the mill. The digital
reads to .0005 inches. Note the clear access to the adjustable
stop nuts with the quill up. The AccuRemote DRO is a
made, all ground stainless steel unit, which is very smooth
in its operation. It is well worth the extra cost
over the extruded aluminum/plastic DROs.
As with the lathe DROs, the mini-USB connector on the display carries
the 3 volt battery
power on 2 of its 4 wires. This makes it easy to use a pair
of AA batteries instead of
the small internal button battery. On my lathe, the DROs have
been powered on continuously
for well over 1 1/2 years on the AA batteries. The button
batteries died within a month or so.
Here you can see the wire running from the DRO to inside my control box.
The batteries reside in the control box.
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R. S. Mason