Rong Fu RF-25 Mill Specifications

Original RF-25 mill configuration. 4" vise has been replaced by a 6" Parlec vise, DROs added, & the standard incandescent light replaced by a halogen lamp.
See RF-25 Mill DRO & X Y Z axes scales. RF-25 Mill Tachometer & SFM

RONG FU RF-25 MILL/DRILL SPECIFICATIONS
Drilling Capacity	1" (25.4mm)
Face Mill Capacity	2½" (63mm)
End Mill Capacity	½" (13mm)
Swing	15.875" (404mm)
Spindle Nose to Table Max. Distance	15" (380mm)
Spindle Taper	R-8
Spindle Stroke - Z	4" (100mm)
Spindle Sleeve Diameter	2.44" (62mm)
Head Swivel	360º
Column Diameter	3.625" (92mm)
Overall Height (w/o Stand)	35½" (900mm)
Machine Stand Height	30" (760mm)
Length	36½" (930mm)
Width	37½" (950mm)
Motor, 110v single phase	1 HP
Spindle Speeds @ 60 Hz	110~ 2580 rpm
Spindle Speeds @ 50 Hz	90 ~ 2150 rpm
Forward & Reverse Switch	Standard
Standard Accessories	2½" Cutter; ½" Chuck 2½" Angle Vise; R-8/J33 Arbor; 7/16"-20 Drawbar
Y - Forward / Backward Table Travel	5.962" (151.44mm)
X - Left / Right Table Travel	14.563" (369.9mm)
Working Area of Table	23"x7½" (585x190mm)
Volume	18.3 cubic ft (0.52 cubic meters)
Noise	80 dB Max
Gross Weight	440 lbs. (199.6 kgs)
Net Weight	374 lbs. (169.6 kgs)

Rong Fu RF-25 mill manual. Specifications of machines may vary among sellers. Values are approximates.

RF-25 mill table slot dimensions where: 24mm = 0.945", 14mm = 0.551", & 10mm = 0.394".

Belt Drive
RF_belt_drive.jpg (55878 bytes)

Runs very smoothly & quietly. Multiple pulleys provide ample torque & no gears to break. Drawbar nut is 17mm.

Speeds

12 speeds. Easy to change; note & set two numbered pulley positions.

Fine Down Feed
RF_fine downfeed.jpg (38904 bytes)

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 screw
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 3 axes scales (1 division = 0.001") were verified as accurate.

Motor

1 hp, 110 VAC, 60 Hz, single-phase, fully enclosed, externally cooled, motor.
Note motor locking leaf bolt for belt adjustment & the two, OEM 19mm (¾") 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-SAE standard size of ½-12x7 with 13/16" hex heads which makes it very hard to
find a direct replacement. A SAE standard bolt is ½-13 with a smaller, ¾" 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, SAE 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 ½" as well as relieving the area under the head. The bolts fit perfectly &
are now all hardened, bolt/washer/nut assemblies. A ⅞", 12-point deep socket, used with a long-handled
⅜" drive ratchet work nicely. A 12-point socket engages the nut quicker (using less wrench movement).
The best tram is achieved by tightening the top bolt first & then going back & forth several times.

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 in place 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.

Milling Vises

The upgraded vise is several orders of magnitude improvement over the 4" model.
Parlec PSW-6900. See mill accessories.

RF_milling_vise.jpg (46776 bytes)

First selected Kurt-style 4" milling vise (37 lbs). Used hardened bolts & washers with standard T-nuts.
Parlec 6" vise now being used on the RF-25. Moved the 4" vise over to the floor drill press.

Swivel base for the 4" mill vise. Remove to increase Z distance & overall rigidity. Used only as needed.

Quick-mount bar clamped by another mill vise. Note, a vise in a vise uses up a lot of Z.

Power Feed
RF_power_feed_2.jpg (40392 bytes)

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.

Bottom view showing the motor engaging the X-axis gear that replaced the left handle.

RF_power_feed_limit_switch.jpg (46191 bytes)

Table travel-limit switch. This has been modified for the DRO X-axis scale mount.

Machine Mounts
RF_stand_machine_foot.jpg (29544 bytes)

Vibration-absorbing machine mounts (from Enco) supporting (optional) Rong Fu cabinet.
Teflon furniture moving pads (attached with double-sided foam tape) are under the feet.
Similar mounts are used on the lathe & band saw. Machine feet instructions.