Part 4: Machine Shop Lead Time Reduction: Cutting Delays Before Cutting Metal
This series started as three posts — planning, quoting, customer service — but there’s a fourth story from the same client family worth telling, and it might be the most literal use of the word “readiness” in the whole set. It starts with a number: average job lead time cut 46%, from 94 minutes to 64 minutes. None of that time was spent cutting metal.
Different aerospace facility this time — a sister site that runs more intricate, higher-complexity parts. And a different question than the last three posts: not how the paperwork moves, but what happens between a job getting released to the floor and a machinist actually making a chip. Turns out that gap was enormous.
Here’s what we found. Tools, programs, and materials weren’t reliably ready when a job was scheduled to run — every team handled baselines, setup sheets, and programs a little differently, so nothing was standard. A machinist could easily burn fifteen-plus minutes just searching bins for the right material with the work order in hand. Tools got identified, written down, and hunted for by hand, because job boxes didn’t come with a tool list or a setup sheet. And for first-run hardware — parts this shop had never made before — the machine program itself was often just missing.
The data made the split obvious. For routine, previously-run parts, the worst-case lead time ran 8.2 days across 14 steps — and delays alone ate about 7 of those days. For first-run hardware, it was worse: up to 19.6 days across 24 steps, with roughly 14 days lost to delay. In both cases, only 3 of those steps were actually value-added. Everything else was staging, searching, and waiting.
We rebuilt the front end of the process. What changed:
- A daily staging meeting. Planning, shop supervisors, engineers, and the tool crib now meet every day to review and prep the next five jobs in every area — before those jobs are needed, not when.
- Job boxes arrive equipped. Complete setup sheets, tool lists, and staged material — 24 hours ahead of when the job is scheduled to run, instead of the machinist assembling all of it themselves.
- QR-coded staging bins. A work order’s material is now found in seconds instead of searched for in bins.
- One home for programs and setup sheets. Standardized naming, centrally stored, instead of scattered files with ambiguous names clogging local machine memory.
The results: worst-case lead time on first-run hardware dropped from as much as 19.6 days to roughly 3.4 hours. Steps in the worst-case process fell from 24 to 10. Delay time alone — the actual waiting, not the working — dropped from over 8,000 minutes to about 120. Across the whole shop, average lead time fell 46%, and completing just 7.4 more work orders a day reclaims roughly 949 hours of capacity a year. Fifty-one distinct opportunities came out of mapping this — most of them the kind of thing nobody notices until you time it.
One of their team leads summed up the week better than I could: “Before the event, communication and procedural gaps between teams caused delays. We have closed those gaps — scheduling, machining, and tooling are finally locked in step.”
If you’re operation is challenged with machine shop lead time reduction, here’s what I’d check on your own floor:
- How much of your lead time is actually cutting metal, versus a machinist searching for a tool, a print, or material?
- Do your setup sheets and programs live in one place with one naming standard, or does everyone keep their own copy?
- Is tomorrow’s work staged today, or does the search start the moment the job hits the floor?
Four posts now, four corners of the same shop: planning, quoting, customer service, and readiness. None of it is the machine. All of it decides how well the machine gets used. If any piece of this sounds like your shop, that’s exactly the kind of work TBM does.
