My first job as a CADmonkey was as a replacement for a guy who got fired over the following error - as a service and installation refrigeration contractor, the company's job was to design and refit all of the refrigerated/freezer cabinets in a large supermarket chain.
Shop floor site drawings were detailed for hi and lo temp case runs and compressor services, including measuring of the cabinet islands themselves, to fit between columns and associated access doors.
The cabinets were built by a subcontractor, to our design for length and height restrictions and could be broken down in to 10m runs or larger, depending on the store and design needs.
Drawings were issued to our subcontractor and the cases were built to size specification according to the plans - in this instance they were in 30m runs.
Installation day arrived and the cabinets duly turned up on the back of a couple of big lorries. Everything went according to plan, closing off the road, having emergency services attend for H&S, the whole shebang. It was not until the cabinets were actually rolled through the maintenance doors that it was discovered that they would not actually fit inside the store, being too long by some 5m!
The bosses were not at all happy to have spent tens of thousands of pounds on bespoke cabinets that did not fit, the store was not happy at not having any equipment for all of their stock they had ordered in advance of the fitout.
It's almost as bad a blunder as one made by one of our structural steelwork subcontractors - the condenser packs for the refrigerated systems are usually located on the roof of the store or the compressor plant building, resting on top of bespoke steelwork I-beam frames due to their weight - up to several tons in some cases.
The particular store in question was in a busy high-street, so everything had to be phased to allow for the road to be closed for the heavy lift crane access, police and fire services to be in attendance and all that stuff.
Compressors arrived and were lifted above the store. Only then was it discovered that the steelwork frames were too large for the footprint of the compressors
All down to getting a few simple dimensions wrong