On 15 December 2025, in the Autodesk forum thread Microsoft CoPilot AI can write AutoLisp coding, a user called SamBensonL4GSH asked a straightforward question: "I know that you can add knowledge sources to Microsoft Co-Pilot, does anyone have any good ones that they've used for theirs or would recommend?" Kent1Cooper quoted that in full and added one line of his own, square … [Read more...] about Stop AI Inventing AutoLISP Functions: Free Allowlist
AI-Generated AutoLISP: What Actually Breaks (2026)
Nobody has written the failure list Search any of the obvious queries — "can AI write AutoLISP", "ChatGPT AutoLISP", "AI generated AutoLISP code" — and you get two kinds of page. One is a tutorial on how to prompt it. The other is a forum thread where somebody pastes a broken routine and three veterans take turns fixing it. A ranking check across six of those queries on 27 … [Read more...] about AI-Generated AutoLISP: What Actually Breaks (2026)
What Does SHS Mean on a Drawing? Square Hollow Section
SHS on a drawing means Square Hollow Section — square steel tube, sized as outside face by outside face by wall thickness, as in 100x100x5.0 SHS. SHS stands for Square Hollow Section: square steel tube used structurally. Posts, portal legs, bracing, lintels, handrails, verandah and carport framing — anywhere you want a closed section that is equally stiff both ways and … [Read more...] about What Does SHS Mean on a Drawing? Square Hollow Section
What Does UB Mean on a Drawing? Universal Beam
UB on a drawing means Universal Beam — the hot-rolled steel I-section used for beams in Australia, New Zealand and the UK, written like 310UB40.4. UB stands for Universal Beam: a hot-rolled steel I-section that is deeper than it is wide, with relatively narrow flanges. That shape is efficient in bending, which is why the UB is the standard floor and roof beam in … [Read more...] about What Does UB Mean on a Drawing? Universal Beam
What Does CRS Mean on a Drawing? Centres
CRS on a drawing means centres — the centre-to-centre spacing of a repeated element, as in studs @ 450 CRS, and not the clear gap between them. CRS on a construction drawing means centres (spelled "centers" in the US): the centre-to-centre spacing of a repeated element, measured from the centreline of one member to the centreline of the next. It is not the clear gap. 90 … [Read more...] about What Does CRS Mean on a Drawing? Centres
What Does DIA Mean on a Drawing? Diameter
DIA means diameter — the distance across a circle through its centre, twice the radius. Written Ø on mechanical sets, DIA on architectural and civil sheets. DIA is short for diameter: the distance right across a circular feature, measured through its centre. It is twice the radius. On a drawing it sizes holes, round bar, dowels, bolts, pipes, cores, bored piers and round … [Read more...] about What Does DIA Mean on a Drawing? Diameter