Underbody truck box drawing package
- Problem
- A truck box has little room: the door, the frame and the latch work within a quarter of an inch, and tread lugs on both faces can take half of it. A drawing of plain plate looks right and binds in the shop.
- What we solved
- Three sizes give seven shop sheets (PDF and CAD) and five cut files, drawn from a 3D model of the box built in the browser: views, sections, flats and weights all come from the same solids.
- Result
- The door swing is checked on the model for every size with the tread lugs counted, and every cut file can be checked by the independent script in the download: 40 checks pass on the sample.
Try it yourself
Free, no account. Type your sizes on the drawing and download the set. If anything looks wrong, press “Found a mistake?” on the page and tell us.
What we solved
- Drafting time: wrap, end panels, door, latch cut-outs, hinge, seal and cables redraw from the length, height and depth; one centred latch below 36 in, two from 36 in.
- Mistakes before the shop floor: the door gap is sized lug to lug, the door swings from shut to the cable stop on the model with the lugs counted, the latch pawl is checked to catch behind the stop, the cables to clear the stops, and every flange against the die.
- Files ready for the cutter: wrap with the hinge holes and reliefs, both end panels, the door with the latch cut-outs to the maker’s template, and the cable tab, at 1:1 in inches with bend lines.
How it is checked
- A separate script (Python, ezdxf) works every flat, hole and cut-out out again from the three sizes and checks the weights and the cables: 40 checks on the sample. The script is in every download.
- The browser model was compared with an independent CadQuery model at three sizes: volumes within 0.01 %, section areas within 0.5 %, every line of its views found in the browser’s, and door gaps within 0.0025 in.
Responsibility
The sheet, welds, hinge and mounting are not sized for any load; mount the box on bottom-support brackets. The latch is a bought part: cut to its maker’s template. The tread lugs are taken as 0.0625 high.