Professional AEG Sector Gear Short Stroke Service | Northmark Vault

Service Highlights:

• Precision Machining: Teeth are removed using a carbide end mill to achieve a clean, smooth, and precise finish, ensuring repeatability across different gear sets.
• PME Mitigation: This is a common method used to prevent Premature Engagement (PME) in high-rate-of-fire builds. Shortening the stroke helps ensure the piston returns fully forward before the sector gear re-engages, which helps avoid internal component damage.
• Cycle Dynamics: Short stroking can result in faster cycle times and improved trigger response because the piston is released earlier in the gear's rotation.
• Air Volume Tuning: This process helps in adjusting the cylinder-to-barrel air volume ratio, which is useful for correcting "joule creep" and ensuring the replica is optimized for specific BB weights.

Service Details:

• Pricing: $10.00 per sector gear.
• Process: Industrial-grade machining for a professional finish.
• Scope: 1 unit per sector gear.

Technical Considerations:

• Tappet Timing: When removing teeth, it is important to ensure the tappet plate is fully released when 2–4 teeth of piston travel remain.
• Tooth Removal Placement:
  • Newer Cam Designs: Typically short-stroked from the pickup side to avoid affecting tappet timing.
  • Older Cam Designs: Often modified from the release side, or a hybrid of both if more than two teeth are removed.
• Adjustments: In many cases, slight modifications to the tappet plate fin may be necessary to ensure perfect feeding and synchronization after the gear has been short-stroked.