How many drawings does one model change touch? Ask that question out loud about an average assembly and few people get the answer right the first time. A thicker flange touches the part drawing, the drawing of the welded subassembly, the detail view on the main drawing and sometimes a general arrangement drawing for the customer. Four sheets, then. Update three of them and exactly one stays in circulation quietly telling the old truth.
The updating itself is not the problem: Inventor refreshes views neatly the moment you open a drawing. The risk sits in the drawing you never open. Updating drawings after a model change is therefore, at its core, a search problem: first find all the associated sheets, only then check and reissue. In this article you will read how to retrieve that complete set, what to check on each sheet and how to reissue the set without missing one. A toolbox like Thundercad removes the searching, so your time goes into the checking.
Why there are always more drawings than you think
Everyone finds the drawing named after the model. The problem sits in the sheets that are not named after the changed part: the weldment it disappears into, the assembly where it shows up with a balloon, the customer sheet with a section cut straight through it. Those drawings are not necessarily in the same folder either; a customer drawing often lives in its own project folder, far away from the model.
An example from a machine builder's daily practice. A bracket gets two extra holes. The part drawing is updated neatly and reissued. Three weeks later the shop drills the holes by hand, because the drawing of the weldment, which already included the bracket, did not show them. Nobody did anything wrong; a sheet was skipped that nobody had in view. That is the heart of this problem: it is not a knowledge gap but a visibility gap.
How many sheets there really are depends on your detailing style. If every part gets its own drawing, an average change quickly touches three to five sheets. If you use many combined drawings with several parts per sheet, there are fewer of them, but missing one is easier too: precisely because one sheet serves several models, nobody thinks of that sheet when looking at this model.
Find the complete set first
Manually there are two routes. In Vault or the Design Assistant you use Where used to ask which drawings and assemblies use the model; that is reliable, but it is a separate search per file and you have to track the results yourself. Searching the project folder by file name is the second route, and it finds only the identically named drawing while missing the assembly sheets entirely.
It is faster to turn this around. With Get Drawings you select the changed model or assembly, and Thundercad looks up the associated drawings and opens them for you. Whatever is now open is your work list: these are the sheets that belong to this change. Count them and write the number down; it becomes your anchor for the rest of the job. Include the sheets of assemblies that merely show the part in that count: whether anything visibly changes there is something you judge later while checking, not now while searching.
Check each sheet for detached dimensions and views
An updated view is not yet a correct sheet. Walk through this list per drawing:
- Detached dimensions: Inventor marks dimensions that lost their reference as soon as the view is updated. Reattach them to the correct edge or face, and look extra carefully around the changed geometry.
- The views themselves: update them and check that they still fit on the sheet. A part that has grown will run out of its border or collide with a neighbouring view.
- Sections and details: after the change, a section line can cut through the wrong geometry or stop showing anything useful. Judge whether the section still tells the story it was meant to tell.
- Notes with quantities: "4x M8" happily stays put while the model now counts six holes. Text knows nothing about your change, so you check it by hand.
- Hole tables and ordinate dimensions: verify that rows and positions reflect the new state.
Count on a few minutes per sheet for an average change. That feels like a lot, until you weigh it against one wrongly drilled hole pattern in a batch of twenty frames.
You cannot skip the checking, but you can skip the searching. With Get Drawings, every drawing of a changed model is in front of you in a single action, so you can start where it matters.
Try 30 days freeReissue the set, complete or not at all
Updated and checked is not the same as issued. Fill in the revision block on every changed sheet in the same way, with the same change reference and a short description, so the shop floor sees at a glance which sheets belong together. Then issue the set in one go, not sheet by sheet spread across the week: half a set in circulation is more confusing than an old set, because nobody knows anymore which sheet represents which state.
Also agree on what "issued" actually means: the round is only finished when the new sheets sit in the agreed place and the old version no longer sits next to them. Two versions of the same sheet in the same folder is the classic source of wrongly plotted work, and no amount of checking beforehand protects against it.
Two things deliberately fall outside this article but do belong to the change. The wider process, with the BOM, purchasing and communication, is described in Implementing changes without a chain reaction of errors. And enough goes wrong while exporting and sending the updated sheets to deserve its own story: Seven export mistakes your customer sees before you do.
From loose action to fixed routine
Do this consciously a few times and you will notice the order is always the same: find, update, check, revise, issue. Write those five steps down as a short list for the department, so a colleague who takes over a change follows the same route and nothing falls through the cracks. And plan the drawing round directly after the model change, in the same work session: leave it for a quiet moment and changes pile on top of each other, making the search bigger every day.
Finding and opening has become a single action with Get Drawings. For the step after that, further automation with Drawing Updater is on the Thundercad roadmap. Until then, the counter is your best friend: as long as found, checked and issued produce the same number, nothing is missing, and the complete drawing round for an average change takes an hour rather than a day.
Frequently asked questions
How do I quickly see whether a dimension is detached?
Inventor marks dimensions without a reference as soon as the view is updated, so those stand out by themselves. More dangerous is the dimension attached to a wrong but existing edge, because that one does not get flagged. So walk past every dimension around the changed geometry; it takes minutes and prevents debates at the saw.
Do I also have to reissue sheets where the change is not visible?
Check them, yes; reissue them, not necessarily. Open the sheet, update it and judge whether dimensions, sections or quantities are affected. If nothing changed, note that briefly with the change; then it is a conscious decision instead of a forgotten sheet, and nobody can second-guess it later.
Can I automate finding and opening all those sheets?
Yes, that is exactly what Get Drawings is for: select the model, and the associated drawings are looked up and opened. You can try it free for a month via the Thundercad download, on your own projects and your own assemblies.