lRF-25 Mill X-Axis Scale
RF-25 Mill DRO &
Y Z Axes
Scales. RF-25 Mill
Tachometer & SFM
9x20 Lathe DRO X
& Z1 Axis Scale.
9x20 Lathe Tachometer & SFM
Taig Mill
Taig Mill DRO &
X Y
Z Axes Scales.
Taig CNC Mill DRO
Taig
Mill Tachometer & SFM Taig Micro Lathe
DRO
18" scale, hardened SS.
This style scale has a good SPC
plug receptacle.
Trimmed scale scrap with plastic cover removed.
I trimmed it with a cut-off wheel & then finished with a
carbide end mill.
2" x 2" aluminum L-channel cover mounted using front dove-tail
slot.
Six, ¼-20, flat-head screws hold the L-channel for a very rigid configuration.
Machined steel dovetail nuts for mounting.
Retained access to the center oilier hole .
The L-channel serves as the scale mount & protects it from impact, fluid & debris.
Original over-travel switch & bracket configuration.
Scale transducer mounted on back of
power-feed over-travel switch bracket.
I used transfer screws
(M3-.5 threads)
for accurate alignment.
I soldered a 100µF 10v tantalum
capacitor across the battery leads of the scale.
New spacer bracket replaces original.
Right/back area has
since been relieved for the SPC cable connection.
This mount protects scale's front (which is not needed) &
places the SPC output on the bottom, back, right.
Only hardened SS scale surfaces are exposed.
Power feed end-of-travel mechanical stops mounted on top/inside bracket surface.
These are the original stops with the stepped end (fly) cut flat.
The ¼-20 mounting bolt is flush with the top of the L-channel bracket.
The electrical stop turns the power feed motor off about four full crank turns
(for this machine)
before reaching the lead screw
mechanical end-of-travel;
just enough distance to allow a
safe stop from full
speed.
This is a machine-dependent distance that needs to be empirically determined.
This area was relieved (both sides) to allow the scale's
lower
bracket edge
to clear the table locks.
A lock nut will be used in the final installation.
The scale rests on pairs of self-aligning,
spherical washers.
I have installed rubber washers on all the scale mounts
to
allow a little floating to reduce the strain on the transducers.
I drilled & tapped the front right carriage corner to mount a
cable strain relief.
It is the cradle/nylon tie type of fastener.
SPC cables from
LMS. All cable plugs are
held in place with a spot of hot glue.
I mounted a cable strain relief on the front left corner of
the
Y-Axis bracket to hold the over-travel switch cable.
RF-25 Mill DRO & Y Z Axes Scales. RF-25 Mill Tachometer & SFM