The workload being modeled
This two-day example models a cap-only order. It is intentionally conservative about handling and makes the final partial multi-head cycle visible through head utilization.
| Target | 100 good pieces in the modeled window |
|---|---|
| Design | 8,000 stitches per piece |
| Order mix | 100% caps |
| Average same-design batch | 50 pieces |
| Production window | 2 days × 7 hours/day |
| Model allowance | 3% rejects/rework; one operator |
What the same workload looks like on different architectures
The numbers below use the same assumptions as the main planner: 1.45 minutes per 1,000 stitches for flat goods, 2.10 for caps, 1.4 minutes handling for flats, 2.8 for caps and one operator. They are planning examples—not manufacturer ratings.
| Setup | Modeled rate | Good pieces/window | Head utilization | First bottleneck |
|---|---|---|---|---|
| 1 single-head | 3.6/hr | 48 | 100% | Machine |
| 2 independent single-heads | 7.1/hr | 97 | 100% | Machine |
| 2-head synchronized | 7.1/hr | 97 | 100% | Machine |
| 4-head synchronized | 13.7/hr | 187 | 96% | Machine |
| 6-head synchronized | 19.8/hr | 269 | 93% | Machine |
The decision this scenario is actually testing
The lesson is not “buy four heads.” It is to identify whether the shortfall comes from machine sewing time, cap loading, or the promised deadline. Better cap hooping or an extra shift may solve a borderline order more cheaply than jumping an equipment class.
Before using this to buy equipment
- Time several real jobs and replace the minutes-per-1,000-stitches assumption.
- Measure hooping/loading time separately from sewing time.
- Use the actual same-design batch size, not invoice quantity.
- Add downtime, maintenance and staffing constraints that matter in your shop.
- Run the shortest real customer deadline, not only the average week.
Questions this example should answer
Why can two heads still miss 100 caps in two days?
The defaults include cap-specific sewing time, handling and a reject allowance. Small changes in your measured cycle can move the result above or below the deadline.
What is the best safety margin?
There is no universal margin. Use a buffer that reflects your downtime, rework, staffing reliability and consequences of missing the due date.
Planning estimate only. The examples on this page are transparent assumptions, not a claim about the sustained output of any specific embroidery machine.