This guide explains how to estimate CNC stirrup bender output for a rebar shop using actual parts, setup time and operating conditions.
Quick answer: Estimate output by product, not from one headline pieces-per-hour figure. Confirm the machine mode and bar diameter, use a supplier estimate for each drawing, then account for setup, material loading, quality checks, and downtime in your shift plan.
Start with the product mix
List the stirrup shapes you expect to make and the share of production for each. Record bar diameter and grade, outside dimensions, number and direction of bends, cut length, and whether the job is single-line or double-line. A small square stirrup and a large multi-bend shape can have very different cycles even on the same machine.
Use this planning formula
Estimated good pieces per shift = theoretical pieces per hour × planned production hours × utilization factor × quality yield.
Theoretical pieces per hour should come from a model-specific estimate for the actual drawing and material. Utilization accounts for setup changes, loading, coil changes, inspections, and short stops. Quality yield accounts for pieces that need correction or are rejected. Use your own historical data for these factors; do not assume a machine’s brochure rate equals good finished pieces for an entire shift.
Example calculation (illustrative only)
If a supplier estimates 1,000 pieces/hour for a particular drawing, and a shop plans 7 productive hours with 80% utilization and 98% quality yield, then the planning estimate is 1,000 × 7 × 0.80 × 0.98 = 5,488 good pieces. El 1,000 pieces/hour input here is hypothetical; replace it with a verified estimate for your drawing.
Questions that change the estimate
- Does the diameter fit single-line or double-line mode?
- How many shapes are produced per shift, and how often do operators change settings?
- Are bars supplied from coils or straight lengths?
- What is the actual steel grade and straightness?
- Can the operator stage material and remove finished parts without interrupting the cycle?
Haihui publishes reference examples for specific conditions, such as about 2,000 pieces/hour for HH4-14S making 20 × 20 cm stirrups. This is a reference point, not a universal rate. El HH4-14S product page lists model information; ask for a drawing-based estimate before planning capacity.
Frequently asked questions
Can I compare two machines by their maximum pieces per hour?
Only if the figures use the same bar diameter, forma, mode, and measurement method. Otherwise, request a comparable estimate.
Should the estimate include setup and handling?
Sí. Separate theoretical machine cycle from good parts per shift, then include normal shop interruptions and changeovers.
What should I send for a capacity estimate?
Send the drawing, diámetro, grado de acero, product mix, target shift volume, and whether you intend to use one or two lines.
Contact Haihui at WhatsApp +86 139 3296 0232 or 417786525@qq.com.