Direct Answer
Claw strength in a claw machine is controlled by the mainboard through programmable parameters that set the electrical current supplied to the claw motor. Operators adjust these settings via the service menu to define how strongly the claw grips during the grab sequence and whether grip strength changes after a set number of plays — a feature known as the win rate or payout control system.
The Claw Motor and Grip Force
The claw unit contains a small DC motor that opens and closes the claw fingers. When the player triggers the grab, the mainboard sends a specific voltage or PWM (pulse-width modulation) signal to the claw motor. A higher current signal produces stronger grip force; a lower signal produces weaker grip. The mainboard controls this precisely so operators can tune the claw's behavior without any mechanical adjustment.
Key Mainboard Parameters That Control Claw Strength
- Grab strength (抓力) — The grip force applied during a normal play. Expressed as a percentage or numeric value (e.g., 0–100 or 1–10 scale depending on mainboard model)
- Win strength (中奖抓力) — The grip force applied on a designated win play. Set higher than grab strength to ensure prize retention
- Win interval / payout cycle — How many plays occur between each win-strength activation (e.g., every 15 plays, one play uses win strength)
- Claw hold time — How long the claw maintains grip during the return travel. Shorter hold time = more drops before reaching the chute
- Drop height — The Z-axis depth the claw descends. Affects how much prize contact the claw makes
How the Win Rate System Works
Most commercial claw machines use a payout cycle system. The mainboard counts plays internally. On every Nth play (set by the win interval parameter), it automatically applies win strength instead of normal grab strength. This guarantees a prize is won approximately once every N plays, allowing operators to control revenue and prize costs regardless of player skill.
On non-win plays, the mainboard deliberately reduces claw grip strength so the prize is likely to drop before reaching the chute — even if the player positions the claw accurately.
Operator Adjustment: Step-by-Step
- Enter the service menu using the operator button or key switch inside the cabinet
- Navigate to claw settings or strength parameters
- Adjust grab strength value (lower = weaker grip on normal plays)
- Adjust win strength value (higher = stronger grip on win plays)
- Set win interval (number of plays per win cycle)
- Save settings and test with a trial play
Common Claw Strength Problems
- Claw always drops prize immediately — Grab strength set too low, or claw motor worn out
- Claw never releases prize — Win strength set too high, or hold time too long
- Claw strength inconsistent — Unstable power supply voltage or mainboard fault
- Win rate not triggering — Win interval parameter set to 0 or mainboard counter reset needed
- Claw fingers not closing fully — Mechanical obstruction or claw motor failure
Frequently Asked Questions
Q: Can players tell when win strength is activated?
A: Generally no. The claw movement looks identical from the outside. The grip difference is internal and not visible during play.
Q: What is a typical win interval setting for a claw machine?
A: Common settings range from every 10 to every 30 plays depending on prize cost and operator revenue targets. There is no universal standard — operators adjust based on their business model.
Q: Does claw strength affect all claw fingers equally?
A: Yes. The claw motor drives all fingers simultaneously through a single mechanical linkage, so all fingers open and close with the same force.
Q: How do I increase claw strength without entering the service menu?
A: You cannot adjust claw strength without accessing the mainboard service menu. There is no external mechanical adjustment for grip force on standard claw machines.
Related Resources
- How a Claw Machine Gantry Works
- How X/Y/Z Claw Mechanisms Work in a Claw Machine
- How Claw Machine Mainboards Work
- Arcade Glossary — Claw Strength, Win Rate, PWM definitions
- Knowledge Center — Mainboard Parameter Guides
- Arcade Spare Parts — Claw Motors and Components
- DIY Claw Machine Kits — Shop All Kits