What is SPM in servo press?

SPM stands for Strokes Per Minute — the number of complete press cycles per minute. Servo presses can vary SPM dynamically during production, unlike mechanical presses which run at fixed speed.

How do I calculate maximum SPM for my servo press?

Maximum SPM depends on stroke length, forming speed, and return speed. Use our SPM calculator above: enter your stroke, approach speed, forming speed, and return speed to get the theoretical maximum SPM.

Why does my servo press run slower than rated SPM?

Actual SPM is limited by the slowest phase of the stroke — usually the forming speed. If you need higher SPM, increase return speed and approach speed, and reduce dwell time at BDC.

⚡ Servo Press SPM Calculator

Calculate max strokes per minute, cycle time, and optimize motion profiles

🔢 Max SPM Calculator

Calculate maximum strokes per minute from motion parameters

Stroke Length (mm) Approach Speed (mm/s) Forming Speed (mm/s) Return Speed (mm/s) Dwell Time at BDC (ms)

strokes per minute (SPM)

⏱️ Cycle Time Calculator

Convert target SPM to cycle time and production output

Target SPM Parts Per Stroke Uptime Efficiency (%) Shift Duration (hours)

ms per cycle

🎯 Motion Profile Optimizer

Get recommended forming speed and motion curve type for your process

Material Type

Process Type

Current SPM

📖 Formulas Used

Max SPM (Full Cycle)

Cycle time accounts for approach, forming, dwell, and return phases:
T = (S/v_a + S/v_r)×1000 + dwell
SPM = 60000 / T
where S = stroke (mm), v_a = approach speed, v_r = return speed, dwell in ms.

Forming Phase Time

Forming speed governs contact time with material. Shorter forming zone = less forming time:
T_form = forming_depth / v_form × 1000
Typically forming depth = 10–30% of total stroke.

Cycle Time ↔ SPM

Simple reciprocal relationship:
T_cycle (ms) = 60000 / SPM
SPM = 60000 / T_cycle

Production Output

Effective output accounting for uptime efficiency:
Parts/hr = SPM × 60 × efficiency × parts_per_stroke
Typical servo press uptime: 80–90%.

📊 Industry Reference Data

Process Type	Typical SPM Range	Recommended Forming Speed	Motion Profile
Blanking — Thin material (<2mm)	60–200 SPM	100–300 mm/s	Trapezoidal / High-speed
Blanking — Thick material (≥2mm)	20–60 SPM	50–150 mm/s	Trapezoidal with dwell
Deep Drawing	10–40 SPM	20–80 mm/s	Sinusoidal / Pendulum
Bending / Forming	15–50 SPM	30–100 mm/s	Sinusoidal
Progressive Die	30–120 SPM	80–200 mm/s	Trapezoidal optimized

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