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Gibs are the wear components that control slide clearance and alignment. Regular monitoring and timely replacement prevent costly secondary damage.
## What Are Gibs?
Gibs are precision-machined wear plates or tapered wedges located between the slide and the frame guides. They maintain the slide in alignment while allowing vertical motion. Materials: cast iron, bronze, or polymer composite depending on press design.
## Wear Detection Methods
**Method 1: Clearance measurement**
Use a dial indicator to measure slide-to-frame clearance at multiple points. Compare to original specification (typically 0.02-0.05mm). Clearance exceeding 2x original indicates replacement needed.
**Method 2: Parallelism trend**
Track slide parallelism measurements over time. Accelerating deterioration indicates gib wear.
**Method 3: Visual inspection**
Remove gib access covers and inspect surfaces. Look for scoring, galling, or uneven wear patterns.
**Method 4: Vibration analysis**
Increased vibration at slide frequency indicates looseness from gib wear.
## Replacement Procedure
**Step 1:** Support the slide with a jack or crane sling before removing gibs.
**Step 2:** Remove gib locking hardware. Note the position and orientation of each gib.
**Step 3:** Measure the worn gib thickness at multiple points. This tells you how much material was lost.
**Step 4:** Order replacement gibs from the press manufacturer. Do not substitute materials without engineering approval.
**Step 5:** Clean gib ways thoroughly. Inspect for scoring — minor scoring can be stoned smooth.
**Step 6:** Install new gibs. Set clearance per manufacturer specification using feeler gauges.
**Step 7:** Verify slide parallelism after installation.
**Step 8:** Run 50 cycles and re-check clearance — new gibs may settle slightly.
## Lubrication After Replacement
New gibs require proper break-in lubrication. Run at reduced speed for the first 4 hours with increased lubrication frequency.