TL;DR

Clutch or brake slip on the Aida NC1 is a safety-critical condition. Stop production immediately and check air pressure and friction disc thickness before restarting.

What you might see

press overruns bottom dead center
brake does not stop ram at top of stroke
clutch engagement delayed or slipping
air pressure alarm on clutch or brake circuit

Likely causes

Tap to mark as ruled out

Worn friction discs below minimum thickness specification
Clutch or brake air pressure below the Aida minimum specification
Oil or grease contamination on the friction surfaces
Worn or damaged air piston seals causing pressure loss at the clutch or brake

Required tools

Calipers (for friction disc thickness measurement)
Air pressure gauge
LOTO kit
Die block (press-specific)
Aida-specified replacement friction discs
Aida-specified air piston seal kit

Safety first

Clutch and brake slipping is a life-safety hazard. Do not restart the press until the condition is fully resolved and the stop-time test passes.
Never bypass or disable the clutch and brake interlocks or light curtains under any circumstances.
Insert the die block before opening any clutch or brake access panel.

Procedure

9 steps · ~90 min

1
Stop production immediately. Clutch or brake slip is a safety-critical condition, do not run the press until the cause is resolved.
Warning: An overrunning press can cause severe or fatal injury. Never bypass or disable clutch and brake interlocks.
2
Press the Emergency Stop and lock out the main disconnect. Insert the die block.
3
Check the clutch and brake air supply pressure at the regulator gauge. Compare to the minimum Aida NC1 specification.[1]
4
If supply pressure is low, trace the air supply line for leaks. Check fittings, hoses, and solenoid valve bodies.
5
Inspect the friction disc thickness through the access port. Measure with calipers and compare to Aida minimum thickness spec. Discs at or below minimum must be replaced.[1]
6
Inspect the friction surfaces for oil contamination. Any oily film on the friction surfaces requires full disc replacement, contaminated discs cannot be cleaned to a safe condition.
7
Test the air piston seals by listening for leakage at the exhaust port while the clutch is engaged.
8
Replace worn friction discs, air seals, or both as needed using Aida-specified parts only.
9
After reassembly, perform a full clutch and brake stop-time test per Aida procedure before returning the press to production.

Sources

Aida NC1 Mechanical Servo Press Operation Manual, Aida Engineering
Aida NC1 Mechanical Press Operation Manual, clutch and brake maintenance and air pressure specifications (general)
View source

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