I'm designing a corner shelving unit, a lot of the measurements are determined by some mid-century units it is fitting within. So very unusually I've been working in inches! I'll give both below! Anyway I plan to have corner shelves and am concerned about sag but don't know quite how to calculate or what's acceptable?
I've used the website http://www.woodbin.com/calcs/sagulator/ and the following information
- 18mm MDF
- L shaped shelf has overall dimensions of 17.5" (445) x 18.5" (470)
- depth consistently 9.25" (235)
I've added both lengths together, as a bit of a worst case. If the shelf is fully fixed to the back panel along it's length I think this added length overestimates the sag and it comes out as 2.11mm total and 2.3mm per m.
Does this sound acceptable? I don't know quite what we'll have the shelves, a few books but it won't be packed hard. I used a weight of 30kg in the calculation.