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Gearbox vs Chain Drive; Rear Shear vs Front Shear on Guardrail Lines
Table of Contents
1. Drive choice
| Drive | Role on guardrail hosts |
|---|---|
| Gearbox (recommended package) | Higher rigidity for continuous thick-panel forming; paired with ~30 / ~45 kW dedicated W2 / W3 examples and ~φ100 shafts |
| Chain (alternate) | Lower-cost optional scheme on the same product family — do not mix chain BOM numbers into a gearbox quote |
Industry guides likewise position gearbox for heavier / continuous duty and chain for lighter budget lines — use as market orientation only.
2. Shear position
- Rear shear (after form) — reference dedicated packages labeled “gearbox after shear”
- Front shear / pre-cut schemes — alternate layouts exist; punch and cut timing differ
Self-check: Speed notes (15 vs 10 m/min) assume a stated punch+shear cycle. Changing drive or shear position without rewriting the cycle story creates false comparisons.
3. Recommended package
FAQ recommended dedicated W2 / W3 packages use gearbox drive + rear shear. That combination is the reference for the about 15 m/min forming / about 10 m/min with punch-shear speed story and for the ~30 kW / ~45 kW main-motor examples. Alternate chain or front-shear schemes need their own proposal lines.
If the RFQ only says “guardrail gearbox line,” still confirm shear position and whether the speed figure already includes punch + cut.
4. Mix-up traps
- Mixing chain-drive BOM into a gearbox quote
- Comparing front-shear cycle time to rear-shear 10 m/min notes without labeling
- Pasting dedicated gearbox figures onto a hoist-change dual without confirmation
5. Inquiry checklist
- Drive: gearbox (recommended) or chain (alternate)
- Shear: rear (reference) or front / pre-cut
- Host: dedicated W2 / W3 / hoist-change
- Speed figure must state whether punch+shear is included
6. Buyer FAQ
Is chain “the same machine cheaper”?
No — treat as an alternate transmission proposal. Do not reuse gearbox shaft / kW tables on a chain quote without confirmation.
Why prefer rear shear on the recommended package?
Reference dedicated packages are written as gearbox + after-form (rear) shear. Front-shear layouts change punch/cut timing and must be labeled separately.
Can I keep 15/10 m/min after switching to chain or front shear?
Not automatically. Those speed notes belong to the stated punch+shear cycle on the recommended package. Re-confirm after any drive or shear change.
Does hoist-change dual use the same drive story?
Confirm on the dual proposal. Do not paste dedicated W2/W3 gearbox numbers onto dual tooling by default.
Final configuration follows the named proposal. Commercial quotes and lead time are out of scope.
References
- 07-HS-GUARDRAIL technical FAQs for GUARDRAIL-W2 / W3 (gearbox recommended; chain optional)
- Industry context: Gearbox vs chain drive for guardrail machines