Guides / Choosing a Supplier
What to Check in Person Before Awarding a Large Part Job
October 2, 2026
A capability page tells you what a shop wants you to know. A site visit tells you what is actually true on the day you would need it to be. For a small bracket the gap rarely matters. For a large structural part where the wrong crane hook height or an overloaded floor section can stall the whole job, it is worth the airfare.
When the trip is worth it
A site visit earns its cost under a fairly narrow set of conditions:
- High value order. A single casting or weldment running into real money justifies more diligence than a routine repeat part.
- First order with a new shop. Once you have a track record with a supplier, later orders lean on that history instead of a repeat visit.
- Safety critical part. Anything where a dimensional or material failure has consequences beyond cost and schedule deserves eyes on the process, not just a report.
- A capability claim that is hard to verify remotely. A shop claiming a specific boring mill envelope or a specific crane capacity is easy to state on a page and harder to confirm without seeing it.
Outside those conditions, a video call with current photos usually covers the same ground for far less time and cost. See the FAQ for what a call can and cannot substitute for.
What a page cannot show you
Machine lists and floor photos on a capability page are a starting point, not the full picture. A few things only show up in person or on a live walkthrough:
Crane hook height at the actual bay. A shop’s overall crane capacity tells you the maximum load. It does not tell you the hook height available at the specific bay your part would occupy, which can be lower once other equipment or overhead services are in the way.
Real floor loading today. Rated floor load is a design figure. Actual available floor load depends on what else is sitting on that section of floor right now, and whether your part would need space currently occupied by another job.
How a comparable part is actually held. Ask to see the fixture or workholding used on something similar to your part, not a description of it. Workholding for large parts is one of the more common places where a stated capability and the working reality diverge, because a table load rating does not tell you how a shop actually clamps an odd shaped or asymmetric part.
Housekeeping and flow. How parts move through the shop, where inspection happens relative to the machines and how organized the staging area is all correlate loosely with how a job will actually run, and none of it shows up in a curated photo set.
A practical checklist
Bring this list, or a version of it, to the visit or the video call:
- Crane hook height and rated load at the bay your part would use
- Current floor load rating for that section, and what else occupies it now
- The largest part currently on the floor, for scale against your own
- Workholding used on a comparable part, seen directly rather than described
- Where incoming material is staged and how far it travels to the machine
- Inspection equipment available on site versus sent out, and turnaround for each
- Whether the shop that would run your part is the shop you are actually visiting, not a sister facility
Site visit or video call
A live video call, with the shop walking a phone camera to whatever you ask to see, covers most of this checklist. It falls short mainly on floor loading, which is hard to verify by camera, and on the general impression of flow and housekeeping that comes from being physically present. Weigh the trip against those two gaps specifically rather than treating a visit as strictly better across the board.
What to do next
Match the level of diligence to the order. For a first, high value job with a new shop, book the visit and bring the checklist above. For a repeat part with a supplier you already know, a short video call before award is usually enough to confirm nothing material has changed.
Related reading: choosing a large part machining supplier, table load and crane capacity, workholding for large parts.
Frequently asked questions
Is a site visit necessary for every large part order?
No. For a low value, low risk part, a video call and current photos usually answer the same questions at a fraction of the cost. Reserve the trip for high value work, a first order with a new shop, or a safety critical part.
What can a shop hide on a capability page that a visit reveals?
Nothing is deliberately hidden most of the time, but a page cannot show crane hook height at the specific bay your part would use, current floor loading after other jobs occupy the shop, or how a similar part is actually held on the table today rather than how it is described.
Can a video call replace a visit?
For most of the checklist, yes, if the shop is willing to walk the floor with a phone camera and answer questions live. A live call beats static photos because you can ask to see a specific machine, a specific fixture, or a specific corner of the floor on request.
Need a quote for a part like this?
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