That is the whole answer. The rest of this page is how to get it written down, and how to tell in the first two weeks whether a supplier will actually do it.
Why silence happens (it is structural, not rudeness)
A machine shop books work against a spindle that is already half-committed. Sales agrees to the date the buyer asks for, because saying no loses the order. Planning then finds out on Monday morning that the job before yours overran.
At that point the shop has two options. Phone you and take the pain early, or say nothing and hope to recover the days. Most choose hope, because there is no process that forces the call.
A US shop owner put it plainly on the Practical Machinist forum: shops will agree to whatever delivery date the customer wants, without knowing at the time whether they can hit it. The same behaviour shows up in UK forums and in how the online platforms position themselves.
This matters because you carry the consequence, not them. The person who stopped the line is you.
What actually decides whether a supplier communicates
Six things predict it, and none of them are on the quotation.
- Who owns the order after it is placed. If the answer is "the office", nobody owns it.
- Whether an acknowledgement arrives automatically. No acknowledgement means no system.
- Whether status exists without a phone call. If you have to ring to find out, you will ring every week.
- Whether bad news travels before the due date. Being told on the due date is not communication.
- Whether the shop knows its own capacity. A shop without a live schedule cannot warn you early, even if it wants to.
- Whether the person quoting is the person who will answer the phone in week three.
Test 2 and 6 during the RFQ. They cost you nothing and they predict the rest.
The four ways to buy machined parts, compared
| Route | Strength | Trade-off | Best for |
|---|---|---|---|
| Direct to a machine shop | Lowest unit price, direct access to the maker | Communication depends entirely on that one shop's admin discipline. No cover if capacity slips | High-volume repeat parts where you already trust the shop |
| Online quoting platform | Fast quotes, portal status, published on-time figures | You usually cannot find out which shop is making your part, and contact with the maker is blocked | Prototypes and simple parts where relationship does not matter |
| Engineering-led managed supply | One accountable contact, multiple shops behind them, proactive updates | You pay a coordination margin. Adds a layer if you already have capacity | Multi-process parts, small to mid volumes, buyers with no time to chase |
| Bring it in-house | Total control | Capital, skills and utilisation risk sit with you | Core IP parts at sustained volume |
How to choose
If your parts are single-process and you have the time to manage the shop yourself, go direct and pick the shop on its planning discipline rather than its price. Ask to see the schedule.
If you are quoting a prototype and nobody downstream depends on the date, a platform is fine and quick. Accept that you will not know who made it.
If the part needs machining plus finishing plus inspection, and a late delivery costs you more than the part is worth, buy managed supply. You are paying for someone to make the phone call you do not want to make yourself.
The honest trade-off with managed supply is cost. There is a margin on top of the shop price. If your only measure is unit price, you will not like it. If your measure is landed cost including your own chasing time and expedite freight, it usually reads differently.
What this looks like in practice
TrueNorth Engineering coordinates machining, fabrication and finishing across a vetted UK supplier network from Manchester. Every order runs through an MRP system with a job number, so status is a lookup rather than a phone call around the shops.
On a recent square flange order the sub-supplier produced parts with chipping on the machined face, a surface finish that missed the drawing requirement of Ra 0.8, and evidence of tool wander. Those parts were caught at inspection before dispatch, not by the customer.
The customer got the non-conformance report, the disposition (scrap and replace) and a revised date from us. The supplier got a corrective action request with two working days to contain and ten working days to return a full 8D. That sequence is the difference between a bad week and a lost account.
We did not enjoy making that call. We made it early, which is the only part that matters.
Four questions to ask before you place the order
Ask these on the phone, not by email. The hesitation tells you as much as the answer.
- Who is my named contact, and who covers them when they are on holiday?
- When will I get the order acknowledgement, and will it confirm the drawing revision?
- What day of the week will I get a status update, and does it come when there is nothing to report?
- If the job slips, at what point do you tell me? On the day, or when you first know?
A shop that answers all four cleanly will usually deliver. A shop that says "we'll keep you posted" will not. The same discipline shows up in on-time delivery benchmarks and in live order status, which have their own guides.