Rong Fu RF-25 Mill/Drill Specifications & Views
Last updated on
Monday, February 22, 2021 08:21:31 AM
Mountain US Time Zone
See
RF-25
Mill DRO &
X Y
Z
axes scales.
RF-25 Mill Tachometer & SFM
Belt Drive
Runs very smoothly & quietly. Multiple pulleys
provide
ample torque & no gears to break. Drawbar nut is 17mm.
Original unmodified RF-25
mill configuration. The 4" vise has
been replaced by a 6" Parlec vise, DROs
added, & the standard
incandescent light replaced by a high-intensity halogen lamp.
The mill
is at the upper limits
of weight & size that I could safely move down
a hill & into my lower-level walkout.
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RONG FU RF-25 MILL/DRILL SPECIFICATIONS | |
Drilling Capacity | 1" (2.54cm) |
Face Mill Capacity | 2-1/2" (6.3cm) |
End Mill Capacity | 1/2" (1.3cm) |
Swing | 15.875" (40cm) |
Spindle Nose to Table Max. Distance | 15" (38cm) |
Spindle Taper | R-8 |
Z - Spindle Stroke | 4" (10cm) |
Spindle Sleeve Diameter | 2.44" (6cm) |
Head Swivel | 360 deg |
Column Diameter | 3.625" (9cm) |
Overall Height (w/o Stand) | 35-1/2" (90cm) |
Machine Stand Height | 30" (76cm) |
Length | 36-1/2" (93cm) |
Width. | 37-1/2" (95cm) |
Motor, 110v single phase | 1 HP |
Spindle Speeds @ 60 Hz | 110~ 2580 RPM |
Spindle Speeds @ 50 Hz | 90 ~ 2150 RPM |
Forward & Reverse Switch | Standard |
Supplied
Accessories |
7/16"-20
Drawbar,
2-1/2" Carbide Fly
Cutter/R8-20mm Arbor, 1/2" Chuck w/R8-J33 Arbor, 2-1/2" Angle Vise |
Y - Forward / Backward Table Travel | 5.962" (15cm) |
X - Left / Right Table Travel | 14.563" (37cm) |
Working Area of Table | 23"x7-1/2" (58x19cm) |
Volume | 18.3 cubic ft (0.52 cubic meters) |
Noise | 80 dB Max |
Gross Weight | 440 lb (199.6 kg) |
Net Weight | 374 lb (169.6 kg) |
Rong Fu
RF-25 mill manual.
Specifications of machines
may vary among sellers; values are
approximate.
RF-25 mill table slot dimensions.
24mm = 0.945",
14mm = 0.551",
& 10mm = 0.394".
Forward (up), Stop & Reversing (down) switch.
Speeds
12 speeds. Easy to change; note &
set two numbered
pulley positions.
Fine Down Feed
The fine down feed housing is held to the mill
with
two hex bolts. To add some backlash adjustment
to the fine down feed, the
housing was removed,
the two 9mm mounting holes were opened up to about
9.5mm & the bolt
heads were turned down a few
thousandths. There was also paint over spray on
the
worm gear that
was removed. Be sure to re-grease
the worm gear. These relaxed tolerances
allowed
additional
housing movement to mesh the gears much
closer & thus reducing backlash. All three axes
scales
(1 division = 0.001") were verified as accurate.
Depth stop & quill lock.
1 HP, 110VAC, 60 Hz,
single-phase,
fully enclosed, externally cooled,
motor.
Note, motor locking
leaf bolt for belt adjustment &
the two, OEM
19mm (3/4") column locking nuts.Possibly due to
the OEM bolts not being hardened,
they were beginning to strip.
The OEM head-locking cross bolts are a
non-standard
size of 1/2-12x7 with 13/16" hex heads which makes it very hard
to
find a direct replacement. A standard bolt is 1/2-13 with a smaller,
3/4" hex head which
would not properly fit into the cast recess that
prevents turning. The bolt holes were
already 9/16" &
did not have to be opened up so I bought hardened,
Grade 8, standard
9/16-12x7 bolts from Bolt Depot.
This size has the requisite 13/16" hex head
& fit
through the
holes but the bolt touched the mill's column.
I lathed the center area down
to 1/2" as
well as
relieving the area under the head.
The bolts fit perfectly & are now all
hardened,
bolt/washer/nut assemblies. A 7/8", 12-point deep socket,
used with a
long-handled 3/8" drive
ratchet work nicely. A 12-point socket engages the
nut
quicker (using less wrench movement).
The best alignment is achieved by tightening the
top
bolt first & then going back & forth a few times.
Task Light
Halogen task light.
I used several electrical box covers to
give the
magnet a good base to grip.
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Installed a vibration-resistant 60W light in
the mill head's internal
cavity. The large
upper plastic
housing holes allow heat dissipation via convection.
The upper bracket is
shown. A porcelain socket &
rotary switch were used. The AC cord is held by a
cable tie down.
This is similar in function to my OEM light in the
Jet floor drill press.
The bulb sticks out to give a better light
dispersion angle & good accessibility for changing.
Cutting with the halogen light
on but the built-in
lamp off.
Cutting with both the
halogen & built-in lamps on.
Milling Vises
Parlec PSW-6900. The
upgraded vise is several
orders of magnitude improvement over the 4" model.
Width sizes available:
3" (76mm), 4"
(102mm), 5" (127mm), 6" (153mm)
2
styles available, 1-pk or 2-pk:
3-5/8" x 3/4" & 5-1/2" x 1-1/8"
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First selected Kurt-style 4" milling vise
(37 lb.)
Used hardened bolts & washers with standard T-nuts.
Parlec 6" vise now
being used on the RF-25.
Swivel base for the 4" mill vise. Remove to
increase
Z distance & overall rigidity. Used only as needed.
Power Feed
Variable speed power table feed has high
torque
throughout its range, works very well.
Clamps onto table end. An integrated travel-limit
switch is mounted on the front edge of the table.
Left/Right direction lever, variable-speed dial &
momentary extra high-speed (yellow) button.
Gear attached where original handle was located
(black plastic gear cover removed for illustration).
Power table feed operation manual.
CAUTION: Do not change power feed directions
suddenly, especially at high speeds. Move lever to
the center, neutral position & wait
until motor stops.
The yellow gear cover removed.
Use
graphite-based grease not silicon type.
Bottom view showing the motor engaging the
X-axis
gear that replaced the left OEM mill handle.
Integrated table travel-limit switch.
Removed
all of the quill levers so they do not
contact the piece when working close
to the vise.
This
configuration allows much better access
to the
two column locks,
belt tension lock, & DRO.
I made & installed 1/2-12 threaded aluminum
plugs
to give it a finished look & keep the chips out.
I like the extra control afforded by the
fine
down feed & have no need for the levers.
Machine Mounts
Vibration-absorbing machine mounts
supporting
(optional) Rong Fu cabinet.
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Specifications,
Belts Drive,
Speeds,
Fine Down
Feed,
Motor,
Integral Light,
Milling Vises,
Power Feed,
Quill Arms,
Machine Mounts