Repeatability is the point
The first batch is easy. The value is in the second and third matching it. Ask how setups, fixtures and programs are documented and stored between runs, because that is what keeps batch three identical to batch one.
Batch size and scheduling
Agree a batch size that balances your carrying cost against the supplier's setup. Blanket orders with scheduled releases often reduce price without increasing your inventory much.
- Single batch with an option to repeat
- Blanket order with scheduled releases
- Kanban or call-off against a held quantity
Quality at batch level
Define first-article requirements, in-process checks and what documentation ships with each batch. Keep it proportionate — excessive inspection on a simple bracket is pure cost.
What to look for in a supplier
- High-mix scheduling and short setups
- Documented, retained setups and programs
- Willing to hold fixtures and tooling between runs
- Transparent about lead time under load
Certifications buyers often need
- ISO 9001
- Industry-specific registrations only where the application requires them
Questions to ask prospective manufacturers
- How do you store and reuse setups between batches?
- What batch size makes this part cheapest overall?
- Will you hold fixtures, and is there a charge?
- What is your typical lead time for a repeat batch?
Frequently asked questions
- Is a blanket order worth it?
- Often, yes. You get the price of a larger quantity while taking delivery in batches. Agree the commitment period and what happens if demand changes.
- How do I stop batch-to-batch variation?
- Fix the specification, keep the same supplier and process, and require documented setups and first-article checks on each run.