Slide 003: Cabinet Maintenance and Troubleshooting¶
Slide Visual¶
Slide Overview¶
This slide covers routine maintenance procedures, common problems, and troubleshooting approaches for blast cabinet systems to ensure consistent performance and safety.
Instruction Notes¶
Routine Maintenance Schedule¶
| Task | Frequency | Procedure |
|---|---|---|
| Inspect gloves | Before each use | Check for holes, thin spots, tears. Replace immediately if compromised |
| Clean viewing window | After each use | Wipe interior lens, replace protective film when frosted |
| Drain air moisture trap | Before each use | Open petcock on moisture separator, drain condensate |
| Clean dead zones | Weekly | Vacuum or sweep media from corners and ledges not fed by recirculation |
| Check nozzle wear | Weekly | Measure bore with pin gauge. Replace if >1/16" oversize |
| Inspect cabinet seals | Monthly | Check door gasket, glove port seals, and all panel joints |
| Service dust collector | Monthly | Check differential pressure gauge, clean or replace filters |
| Inspect blast hose | Monthly | Check for wear, kinks, or soft spots. Replace if outer braid is exposed |
| Complete media change | As needed | When performance degrades, dust increases, or changing media type |
Troubleshooting Guide¶
Problem: Reduced blasting power - Check nozzle — worn nozzles lose velocity (most common cause) - Check air supply pressure at cabinet — may have dropped below setpoint - Check for moisture in air lines — wet media clumps and flows poorly - Verify media level in hopper — low media causes air-only blasting - Check for kinked or partially blocked blast hose
Problem: Excessive dust in cabinet / poor visibility - Dust collector filter is clogged — check ΔP gauge, clean or replace - Ductwork disconnected or blocked - Cabinet seal failure — check door gasket, glove ports - Media has broken down excessively — perform full media change
Problem: Media not flowing - Moisture causing media to clump — drain air lines, dry media - Pickup tube blocked — clear with compressed air - Foot pedal valve stuck — inspect valve mechanism - Media hopper empty — refill
Problem: Uneven blasting results - Inconsistent technique — practice maintaining constant speed and distance - Mixed media types — perform complete media change - Partially clogged nozzle — remove and clean or replace - Air pressure fluctuating — compressor may be undersized or cycling
Nozzle Wear Reference¶
| Nozzle Material | Original Bore | Replace When Bore Reaches | Typical Life (hours) |
|---|---|---|---|
| Steel | 1/4" (6.4mm) | 5/16" (7.9mm) | 20–40 |
| Ceramic | 1/4" (6.4mm) | 5/16" (7.9mm) | 300–500 |
| Tungsten Carbide | 1/4" (6.4mm) | 5/16" (7.9mm) | 500–800 |
| Boron Carbide | 1/4" (6.4mm) | 5/16" (7.9mm) | 1000–1500 |
Key Talking Points¶
- Maintenance prevents 90% of cabinet problems — follow the schedule
- Nozzle wear is the number one cause of declining performance
- The dust collector filter is a consumable — budget for replacement cartridges
- A maintenance log helps predict issues before they cause downtime
Learning Objectives (Concept Check)¶
- Perform routine maintenance according to the recommended schedule
- Diagnose the three most common cabinet performance problems
- Determine when a nozzle needs replacement based on bore measurement
Last Updated: 2026-03-19