Why Disc Changes Matter for Safety
An angle grinder disc spinning at 12,000 RPM is one of the most hazardous tools on the jobsite when handled incorrectly. A cracked, loose, or wrong-size disc can shatter under load. This guide covers the correct procedure for changing a disc on your WorCraft 20V angle grinder — safely and quickly.
What You'll Need
- WorCraft 20V angle grinder
- Replacement disc (correct diameter and arbor size for your grinder — see tool spec label)
- Spanner wrench (included with your WorCraft grinder)
- Safety glasses and gloves
Before You Start: Safety Checks
- Remove the battery pack before touching the disc — always. Never change a disc with the battery installed.
- Inspect the new disc for cracks, chips, or damage before installing. Never use a damaged disc.
- Confirm the disc's rated RPM is equal to or greater than your grinder's no-load RPM (printed on the tool label).
- Confirm the disc diameter and arbor hole match your grinder's specs.
Step-by-Step: Changing the Disc
- Remove the battery pack and set it aside.
- Press and hold the spindle lock button on the grinder head to lock the spindle in place.
- Using the spanner wrench, turn the locking nut counterclockwise to loosen it. (Remember: righty-tighty, lefty-loosey — but note some grinders use reverse thread; check your manual.)
- Remove the locking nut and outer flange.
- Slide the old disc off the spindle and discard it safely — do not reuse cracked or worn discs.
- Place the new disc onto the spindle, ensuring it seats flat against the inner flange.
- Replace the outer flange and locking nut. Hand-tighten first, then use the spanner wrench to snug it — do not overtighten.
- Release the spindle lock and reinstall the battery pack.
- Before use, hold the grinder away from your body and run it briefly at no-load to confirm the disc is seated and balanced.
Disc Types for Stone & Tile Work
| Disc Type | Use |
|---|---|
| Diamond grinding cup wheel | Grinding seams, shaping stone edges |
| Diamond cutting disc | Cutting stone, tile, and masonry |
| Flap disc | Surface finishing, blending welds |
| Wire cup brush | Surface prep, rust and paint removal |
FAQs
Q: How often should I replace my angle grinder disc?
A: Inspect every disc before each use. Replace immediately if you see cracks, chips, or the disc has worn down to the wear indicator line. Never use a disc past its rated life.
Q: Can I use any brand of disc on my WorCraft angle grinder?
A: Yes — as long as the disc matches your grinder's disc diameter, arbor size, and rated RPM. Always check the disc label against your tool's spec plate before installing.