If it is supported along the entire length of the top and bottom then it should be no problem at 2.5mm.CheersIan
Hmm..unfortunately it's only supported at the four corners. The price difference between 2.5 and 3mm is not so bad but I'm starting think I should go thicker than 3mm. Do it right or do it twice situation... Does 4mm seem overkill? What about 1mm cavities for the pots? Do you think that be necessary? Panel with engraving will probably be close to $200 at this point for a one off.
4mm thick will not be enough for nearly 19 unsupported inches. Even steel will flex over that length. If it is impossible to support at the top and bottom then you may be forced to go to the audophile thickness of 10mm.CheersIan
I wouldn't say totally unsupported. There is a chassis behind it and against it. It's only secured at the 4 holes about 17" across and ~4" vertically.
OK, understood. Where it is secured does not matter too much from the bending point of view but where it is supported does. So if you have a chassis running along the top and bottom such that if you press the top middle of the front panel it pushes also directly against the chassis then it is supported in which case you are OK with 2.5mm. Basically if it is supported around its periphery it will be fine. Because it is only 3U high the maximum distance of any unsupported part from a support is 1.5U which is fine for 2.5mm aluminium.CheersIan
I could see how a panel only supported on the far ends would need to be very thick
I've seen that done before. While obviously its not ideal it wouldn't have to be obtrusive. I think I'll be alright on this design with 3 mm panel. It's actually just over 3mm at 1/8". I found a similar panel around the shop and it seemed like it would be fine I could always add the angle later. I did however remove the bezels around the edgewise meters and install PEMS on the back side. This allowed me to raise the Main Output knobs a good 1/4". It should be cleaner overall.