Intruction of assembling knife shaft
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Author : Matt Xia
Update time : 2026-08-04 21:54:31
Complete Installation Guide for Slitter Blade Shaft
Concise Version — Every Step from Inspection to Shipment
Suggested: Finished blade shaft / Workshop
Dear Valued Customer / Respected Operators:
Thank you for choosing our slitter blade shaft products. Proper installation directly affects slitting accuracy, blade life, equipment stability, and product quality. This guide walks you through our standard installation process — we install it the way we teach it.
I. Pre-Installation Preparation
1. Visual Inspection
Components laid out for inspection
Lay out all components (blades, shims, spacers) and inspect:
| Component | Check For | Defect Action |
|---|---|---|
| Blades | Chipped edges, rust, scratches | Set aside defective ones |
| Shims | Burrs, deformation, uneven thickness | Reject or rework |
| Spacers | Uneven end faces, scored bore | Replace if damaged |
Key rule: Never install defective parts — pause and replace.
2. Cleaning
Wiping components with clean cloth
Wipe all confirmed-good components with a clean cloth and kerosene/alcohol. Focus on: blade bores, shim faces, spacer surfaces. Surface must feel grit-free.
3. Vertical Positioning — Let Gravity Help
Shaft vertical, installing from top
Place the shaft vertically (flange down, locking end up). Install components from the top downward.
Benefits:
- Components slide down naturally
- Self-weight compresses each layer for tighter fit
- Easier keyway alignment
- Better rigidity after locking
In short: Vertical = gravity assists you; horizontal = you fight gravity.
II. Core Assembly Steps
Step 1: Install by Calculated Sequence
Components being installed one by one
Follow the process sheet. Calculate total width first.
Sequence (flange end outward):
Spacer → Shim → Blade → Shim → Spacer → Shim → Blade → Shim → Spacer …
Install one by one — confirm each before placing the next. Spot-check width every 3–5 groups. Tick off on paper as you go.
Step 2: Unify Keyway Orientation
Keyways aligned / Marker pen marking
- With keyways: Align all to the same direction (e.g., 12 o'clock).
- Without keyways: Mark a vertical line with marker pen; keep all marks aligned.
Rule: Same direction all the way through.
Step 3: If Stuck — Use Rubber Mallet Only
Tapping symmetrically with rubber mallet
- Check alignment and tilt
- Tap symmetrically with a rubber / nylon / copper mallet
- Rotate, tap again, push gradually
Never use a steel hammer — one blow can scrap the shaft.
