SWC-003 · Pearl Granulator00

Legacy Soil & Stone

Pearl
Granulator

Assembly Manual · SWC-003

03 May 2026 Read all steps before starting 13 parts · 7 steps

Parts & tools01

Check your parts

13 items · 5 tools

×1 Feed pan, 17–22" A

×1 12V DC gearmotor, 5–40 RPM B

×1 PWM controller + 12V PSU C

×1 Universal joint D

×1 Square spindle, 5/16" × 7" E

×1 Hub plate F

×1 set ¾" plywood: base + disc G

×1 4×4 post, cut to 6" H

×1 Piano hinge, 2" × 8" I

×1 + nut ¼-20 threaded rod + wing nut J

kit Bolts, washers, lock nuts K

×1 Mist spray bottle L

×1 qt Lithium silicate binder M

Drill + bits

Wrench / pliers

Screwdriver

Tape measure

Square

Cut & drill02

01

Cut plywood pieces and drill mounting holes.

Cut a 30 × 30" base and a ⌀22" disc from ¾" plywood. Drill a ½" center hole in the disc. Drill 4× 5/16" holes at R 7", spaced 90° apart. Cut 4×4 post to exactly 6.0".

Part GPart H

Hinge to base03

02

Mount piano hinge to the front edge of the base.

Center the hinge along the front edge of the base board. Screw one leaf flush to the base with wood screws. Leave the second leaf free — the post will attach to it in Step 3.

Part G — basePart IPart K — wood screws

Post + motor04

03

Attach post to free hinge leaf. Bolt motor to post.

Screw the bottom face of the 4×4 post onto the free hinge leaf. Bolt the gearmotor bracket to the inside face of the post with the output shaft pointing up along the post axis.

Part BPart HPart IPart K — bolts

Spindle stack05

04

Assemble the spindle stack.

Connect: motor output → universal joint → square spindle → through disc center hole → into hub plate. Tighten the set-screw on the spindle. Bolt the hub plate to the underside of the disc through the four R 7" holes.

Part DPart EPart FPart G — disc

Bowl to disc06

05

Bolt the bowl to the disc.

Drill four 5/16" holes in the bowl bottom on the same R 7" pattern as the disc. Drop bolts through from inside the bowl. Add fender washers inside, then lock nuts beneath the disc. Snug firmly — do not overtighten.

Part APart G — discPart K — bolts / washers / lock nuts

Tilt adjuster07

06

Install the tilt adjuster rod.

Bolt one clevis to the base ~8" behind the hinge centerline. Bolt the second clevis to the upper rear face of the post. Thread the ¼-20 rod between them and tighten the wing nut. Spinning the wing nut adjusts the tilt from 35° to 60°.

Part JPart K — clevises + bolts

Wire it up08

07

Wire the drive system.

Connect: 12V power supply → PWM controller input → PWM controller output → gearmotor leads. Power on and turn the PWM dial to ~50%. Confirm the bowl rotates so powder would ride up the back wall. If rotation is reversed, swap the two motor leads.

Part B — motorPart C — PWM + PSU

Final check09

Final check

Before first run

1 · Spin test

Power on. Bowl rotates smoothly with no wobble. If wobble, re-center hub plate and re-tighten bolts.

2 · Tilt test

Wing nut adjusts tilt smoothly from 35° to 60° with no binding. Start at 45°.

3 · Rotation direction

Powder should ride up the back wall and tumble down the front. Swap motor leads if reversed.