RF-20: The Smallest Centrifugal Disc Finisher in the RF-Series

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RF-20 Centrifugal Disc Finisher

High-Energy Disc Finishing in the Smallest Footprint: 33″ x 33″, 0.7 Cu Ft

The RF-20 is the smallest centrifugal disc finisher from Mass Finishing—and the most accessible way for a small shop, lab, or production cell to add high-energy finishing. At 33″ x 33″ (under 8 sq ft) and 575 lbs, it fits the footprint of a small vibratory tumbler but finishes parts 10–30x faster.

Centrifugal disc finishing differs from centrifugal barrel finishing. Instead of sealed rotating barrels, the RF-20 uses an open-top tub with a spinning disc. This creates a toroidal flow pattern—parts and media move up the walls and down through the center—driving high-energy contact. The open design allows in-process loading, visual inspection, and hydraulic tilting for part/media separation.

The result is the same: deburring, edge radiusing, surface smoothing, and polishing with greater speed and consistency than manual methods. Disc machines are best for small, loose parts that tumble freely—stamped components, small machined parts, fasteners, and connectors—while barrel machines are better for larger parts or those needing isolation.

Capacity: .7 cu ft
Working Capacity: .7 cu ft
Overall L x W x H: 33″ x 33″ x 49″
Tub Size: 11″ x 11.5″
Motor: 1 HP
Weight: 575 lbs
Voltage: 230 or 460

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About the RF-20 Centrifugal Disc Finisher

The RF-20 is the smallest centrifugal disc finisher from Mass Finishing—and the most accessible way for a small shop, lab, or production cell to add high-energy finishing. At 33″ x 33″ (under 8 sq ft) and 575 lbs, it fits the footprint of a small vibratory tumbler but finishes parts 10–30x faster.

Centrifugal disc finishing differs from centrifugal barrel finishing. Instead of sealed rotating barrels, the RF-20 uses an open-top tub with a spinning disc. This creates a toroidal flow pattern—parts and media move up the walls and down through the center—driving high-energy contact. The open design allows in-process loading, visual inspection, and hydraulic tilting for part/media separation.

The result is the same: deburring, edge radiusing, surface smoothing, and polishing with greater speed and consistency than manual methods. Disc machines are best for small, loose parts that tumble freely—stamped components, small machined parts, fasteners, and connectors—while barrel machines are better for larger parts or those needing isolation.

Standard Features

Variable Frequency Drive
Digital Process Timer
Polyurethane Lined
Upflow Drain System (water is pushed up thru disc gap & drains toward top of machine)
Finish Cycle Buzzer
Ideal Unload Height
Convenient Operator Control Console
Hydraulic Disc Unload
Variable Process Timer
Amp Meter
RPM Meter

RF-20 Features: What’s Included

Feature

Variable frequency drive

Adjustable disc speed lets you control finishing intensity. Lower speeds for gentle polishing of plated or delicate parts, higher speeds for aggressive deburring on hardened steel or machined components. The VFD is standard on the RF-20—not an add-on.

Hydraulic disc unload

At the end of a cycle, the rotating disc tilts hydraulically to separate parts from media and feed them into a recovery bin. No manual scooping, no barrel lifting, no lid handling. This is faster and less physically demanding than barrel-style unloading.

Polyurethane-lined tub

The tub and disc are lined with durable polyurethane to protect parts from metal-to-metal contact with the machine body. The lining also absorbs impact energy and extends tub life under daily use with abrasive ceramic or synthetic media.

Upflow drain system

Water is pushed up through the disc gap and drains toward the top of the machine. This keeps the drain above the media level, which prevents media from clogging the drain during continuous-flow operation—a common problem on machines with bottom-drain designs.

Digital process timer + RPM/amp meters

Set precise cycle times and monitor machine performance in real time. The RPM meter confirms disc speed, and the amp meter shows motor load—useful for detecting when media is worn and no longer providing effective cutting action.

Compact, ergonomic design

At 33″ x 33″ x 49″, the RF-20 fits into tight production cells, lab spaces, and small shop floors. The operator control console and unload height are positioned for comfortable standing operation without bending or reaching.

RF-20 Centrifugal Disc Basic Operation

To operate the RF-20 Centrifugal Disc Finisher, manually load the barrel with media, parts, and compound. Turn on the machine and set it to your desired speed. Then, drop in your parts and allow the machine to complete the cycle. Once the cycle is finished, press the “stop” button to stop the cycle. Position the recovery bin under the machine, and slowly tip the barrel to separate the parts from the media.

What the RF-20 Is Built For

Ideal Part Types

Centrifugal disc finishers work best with small, loose parts that can tumble freely in the open tub. The RF-20’s 11″ x 11.5″ tub and 0.7 cu ft capacity are sized for:

Small stamped and formed metal components (brackets, clips, contacts, terminals)
Machined and turned parts (bushings, spacers, fittings, connectors)
Fasteners and hardware (screws, bolts, pins, washers, rivets)
Small cast and MIM (metal injection molded) components
3D-printed metal parts requiring surface refinement
Small jewelry components and findings

Who Buys the RF-20

The RF-20 is typically purchased by operations that are either space-constrained, volume-limited, or evaluating centrifugal disc finishing for the first time:

Small machine shops and job shops that hand-deburr small parts and want to automate the process without dedicating major floor space or budget to a finishing machine.
R&D and prototype labs that need to finish small batches of parts for testing, evaluation, or customer samples—where a 2+ cu ft machine would be oversized for the volume.
Production cells with limited space where the finishing machine needs to fit beside a CNC lathe, mill, or press in a tight footprint.
Companies adding finishing as a secondary operation for the first time—the RF-20’s low cost of entry makes it practical to test the process before committing to a larger RF-50 or RF-100.

RF-20 vs. Vibratory Finishing

Many RF-20 buyers are replacing a small vibratory tumbler or bowl. The key advantages of centrifugal disc finishing over vibratory methods are speed (10–30x faster cycle times), surface quality (more consistent and uniform results), and media efficiency (the high-energy contact uses media more effectively per cycle). The tradeoff is capacity: a vibratory bowl of similar footprint may hold more volume, but it processes much more slowly. For small-batch operations where cycle time and finish quality matter more than raw volume, the RF-20 is the better investment.

When to Choose Centrifugal Disc Over Centrifugal Barrel

Factor	Centrifugal Disc (RF-20)	Centrifugal Barrel (HZ-Series)
Part Loading	Open top—add parts during operation	Sealed barrels—load before starting
Visual Inspection	Yes—watch the process in real time	No—barrels are sealed during operation
Unloading	Hydraulic disc tilt—fast, hands-free	Open barrels, pour or lift contents
Part Isolation	Parts tumble freely together	Dividers create individual chambers
Best Part Types	Small, loose, robust parts that can tumble freely	Larger parts, delicate parts, parts needing individual isolation
Typical Applications	Stamped parts, fasteners, machined fittings, bulk small parts	Knife blades, firearm components, dental restorations, automotive parts

Choose centrifugal disc when your parts are small, robust, and can tumble together freely—and when you value the ability to load during operation, inspect visually, and unload quickly.

Choose centrifugal barrel when your parts need individual isolation (to prevent part-on-part contact), when parts are larger or more delicate, or when you need the sealed-barrel environment for controlled finishing of high-value components.

RF-20 vs. RF-50: When to Step Up to More Capacity

Factor	RF-20	RF-50
Capacity	0.7 cu ft	1.75 cu ft
Footprint	33″ x 33″	(Larger—verify dimensions)
Motor	1 HP	(Verify—likely 3–5 HP)
Best For	Small shops, R&D, space-constrained cells, process evaluation	Higher-volume production, larger batch sizes, established finishing workflows

Choose the RF-20 if your batch volumes are small, your floor space is tight, you’re evaluating centrifugal disc finishing for the first time, or your budget favors the smallest machine. The RF-20 produces the same finish quality as larger RF models—it just processes less volume per cycle.

Step up to the RF-50 if your daily part volume has outgrown 0.7 cu ft of batch capacity, or you need more motor power for heavier parts and denser media. The RF-50 offers 2.5x the capacity of the RF-20.

Not sure which size fits? Send us sample parts—we’ll process them free of charge and recommend the right machine for your application.

Are You Interested in the RF-20?