Abrasive and disc body
A thin 12-inch PSA sheet adheres to the rigid rotating metal plate; replace the sheet when loaded or worn.
Power Tools / Sanding / Field guide
Benchtop Disc Sander
Shape edges and end grain against a rotating abrasive disc with the work supported on a close-set table.
12 in PSADisc½ hpMotor
01 / Tool anatomy
See the assembled tool and its components
An original educational poster identifies 9 documented construction features. The numbered descriptions remain readable below the artwork on narrow screens.
- PSA abrasive disc
Thin 12-inch sanding sheet adheres to the metal disc plate.
- Metal disc plate
Smooth front supports the full PSA sheet; rear hub aligns with the motor shaft.
- Upper half guard
Covers the right upper sector of the disc while leaving the downward-moving side available.
- Enclosed motor
Drives the disc through a supported shaft.
- Miter gauge
Guides angled stock along the table slot.
- Tilting work table
Supports the work below the disc; maintain the specified narrow gap.
- Table trunnion
Holds and locks the table at the chosen bevel angle.
- Base and mounting feet
Two low mounting feet and central support stabilize the sander on a bench.
- Dust port
Lower horizontal outlet connects to compatible dust collection.
Technical references: Rikon 51-200 official product and parts · Rikon 51-200 manual with exploded parts diagram. The thin PSA abrasive sheet adheres to the smooth front of the metal disc plate; the plate's rear hub faces the motor shaft. The Rikon 51-200 manual supports separate abrasive, disc body, guard, motor, miter gauge, table and trunnion groups. The central support and horizontal dust tube remain on the two mounting feet. This is an educational arrangement, not a motor service sequence. Original educational artwork depicts documented component groups and their relationships; it is not a service sequence or a replacement for the exact model manual.
02 / Understand the tool
What it is and what each part does
Rikon's 51-200 is a dedicated 12-inch benchtop disc sander with a ½-hp, 120 V motor, 1,720 rpm disc, tilting work table, included miter gauge and rear dust outlet. It uses pressure-sensitive-adhesive (PSA) abrasive discs, not hook-and-loop sheets. A disc sander excels at controlled edge and end-grain shaping against a table; it does not replace a wide-belt machine for broad face sanding or a spindle sander for inside curves.
The motor shaft drives the rear hub of a metal disc plate. The plate's smooth front carries a full adhered PSA abrasive sheet. The work table registers stock close to the lower front of the rotating disc; its trunnions lock the angle, and a miter gauge tracks the slot. A front upper-right half guard screens the opposite side; a horizontal lower dust outlet leads from the open support. The official manual's parts diagram distinguishes abrasive, disc body, guard, table, trunnions, motor and two mounting feet. Their separated study is educational; electrical and motor repairs are for qualified service.
Table and miter gauge
The flat table supports work at a chosen tilt; the gauge helps guide angled edges along its slot.
Guard, motor and dust
The front upper-right guard covers the rising side of the disc; the rear motor drives it and a lower horizontal outlet accepts dust collection.
Trunnions and base
Side locks hold table angle and two open mounting feet secure the support to a stable bench.
01 / Working relationship
How the main groups connect
02 / Working setup
Use the downward-moving side
02 / Working principle
Set, guide and control the action
These decisions make the mechanism useful at the bench.
Work on the down side
For the manual's rotation direction, use the disc's left side where it presses the work toward the table; avoid the rising right side.
Keep the table close
Adjust table-to-disc clearance to no more than the manual's 1/16-inch limit before use.
Use light movement
Keep the work flat and move it across the abrasive; do not hold one spot until it burns or overheats.
Square a small end
Use a suitable gauge and test piece to refine an end-grain edge.
Shape a convex edge
Rotate supported stock smoothly across the descending side without reaching beyond the table.
Fit a bevel
Set and lock table tilt, then check the angle on scrap before sanding the actual part.
03 / At the bench
Setup, technique and finish quality
Use the steps for a first pass, then inspect the work before changing the setup.
- Secure the machine, connect compatible dust collection and inspect disc and table.
- With power disconnected, set table tilt and lock it; keep the disc clearance within the manual's limit.
- Fit the miter gauge when angle guidance is needed and test its travel without touching the abrasive.
- Turn on, stand clear during startup and allow the disc to reach speed.
- Hold the work flat on the table and feed it into the left/downward-moving side using light, moving contact.
- Withdraw, switch off, wait for a full stop and inspect the edge; repeat in small passes.
Rotation sets the safe side
The left side's downward motion presses stock onto the table; the opposite side can lift or eject it.
PSA is model-specific
Rikon's manual explicitly calls for adhesive-backed discs and says hook-and-loop discs cannot be used on the 51-200.
A gap is a hazard
The manual limits the table-to-disc clearance to 1/16 inch to reduce catching of stock or fingers.
What changes by model or material
Larger discs offer more working area but demand stable mounting and appropriate dust capture.
PSA, hook-and-loop and other systems are not interchangeable without maker-approved conversion.
Belt/disc machines add a separate sanding path; the chosen 51-200 is a dedicated disc sander.
Choosing the tool
- Confirm disc size, abrasive attachment method and replacement media availability.
- Check a stable table, useful miter slot and secure tilt locks.
- Plan suitable dust collection and a bench position that leaves the descending side accessible.
Useful accessories
- Compatible miter gauge
- Dust collection hose sized to the port
- Sanding-cleaning block
Consumables
- 12-inch PSA abrasive discs in suitable grits
04 / Keep control
Care, troubleshooting and safety
Stop the tool and disconnect power before investigating a fault or changing a part.
Care checklist
- Disconnect power before changing abrasive or cleaning the guard.
- Peel old PSA media, clean adhesive residue and center the new disc on a clean plate as the manual directs.
- Vacuum dust from the table, guard and motor openings.
- Check table locks and clearance after adjustment or transport.
Common mistakes
- Working on the upward-moving right side of the disc.
- Letting the table gap exceed the manual limit.
- Using hook-and-loop sheets on a PSA plate.
- Holding a small piece with fingers near the disc instead of an appropriate fixture.
Safety at the operation
- Read the manual and wear eye, hearing and suitable respiratory protection.
- Use dust extraction and avoid loose sleeves or jewelry near the rotating disc.
- Keep the work supported on the table and away from the rising side.
- Disconnect power for disc replacement or table service; wait for full stop before clearing debris.
When the result goes wrong
Use fresh suitable grit, move the work steadily and check support and table lock.
Stop, disconnect power and replace with the correct clean PSA sheet firmly centered on the plate.
Check both trunnion locks, table registration and miter gauge setup before another pass.
05 / Sources to keep learning
Manuals and educational resources
Use the exact tool manual for setup, limits and replacement parts. These lessons, documents and model pages teach relevant techniques or help compare real variations.
Manufacturer manuals
Learn and compare
06 / Manufacturer directory
Manufacturers & Brands
These maker-owned links document relevant tools and tool brands. A product brand may use another company's factory; compare the exact model before choosing parts or accessories.
Choose parts for the exact model
Cutters, abrasives, guards, guides, dust fittings and service parts vary by tool. Check the model plate and manufacturer manual before ordering or changing a component.
Compare the Sanding family →Continue through the Tools library