Case Quirks + Problems

fcd72

Ladies and Gentleman,

as i did all the Cases and Julian has more interesting Things to do than sorting out these issues, please post your Case-related Issues here in this thread, send me a PM or contact me directly via fcdaniels (funnycharacterwiththea) me (pünktchen) com

Best,

Frank

diwib

Might have been my mechanical incompetence, but either way, a µm or two more tolerance on the holes would have saved me minutes worth of "omg omg I'll break my pcb" 

Note that the spacer was VERY stiff; I have no idea how I made it fit...there must be a lota tension on the board.

'Scuse the flash but without I rarely get a sharp picture...

fcd72

The holes are already with +0,5mm Tolerance, i cant give much more else the edges might break when tightening the crews.....  i could go with slots but this only hels in one axis and looks ugly.

Problem with all these big PCBs like on the LXR or Ambika is, the PCB is almost everytime a bit bent (due to the unequal amount of copper on both sides...) and this doesnt get better with soldering all the components. 

Best practice would be to mount the Board with loose screws and then tighten them.

toneburst

My issue is a little different.

It looks like the culprit is the slots in the long edges of the top panel. They don't seem to be deep enough to match the thickness of the acrylic. It's more obvious along the front edge, but it's there at the back, too. The mismatch at the back pushes the top panel forward a fraction, which is why the holes in the top don't line up and the side and front panels don't meet properly at the front edges.

Hopefully it's just me.

a|x

bassFant

Same problem as tonburst here. I measured the thickness of the plexi with a caliper and there are differences in my set of panels. While top and bottom panels are nearly 3mm, the backpanel is almost 3,4mm. Front an sidepanels are 3,2 - 3,3mm. Hopefully this could be solved by carefully filing.

Mirko

Is this related to the tolerance of cast plexi Frank once mentioned over at the MI forum?

Mirko

fcd72

Yups, this is the tolerance of the thickness of the GS (casted) Acryl. The parts are different because they are cut from different sheets that are from different places of the original big (2mx3m) sheet, so you may have different thicknesses in one packet - this is to make optimal use of the material and cutting time.

toneburst

@fcd72 I can understand there's a tolerance, but I've got quite a few items in this style of plexi case, and none are as far out-of-whack as this one, I have to say. The case visibly doesn't fit together properly and it makes creaking noises as it flexes when moved, even with the screws all done up nice and tightly. None of my other cases do this. Maybe bassFant (nice ID, by the way) an I have just been unlucky to be at the extreme end of the 'mismatch spectrum'.

a|x

fcd72

@a|x

most cases are cut from XT (Extruded) Plexi, which makes a more constant thickness - unluckily Neuropa  is a color thats not available as XT material - if you have severe problems ill exchange the panels that are not fitting. A thing that makes problems worse is that the panels dont come from an adjancent area of the Big Panel which would lead to consistent thickness, due to costs i have to cut the parts seperate and sort them later so you might get a real thick front and a thin back.  Ill try to sort the panels to thickness for the next batch, but its a real time killer.....

bassFant

After some hours of carefully filing (the cutouts in top and it bottom panel) looks much better. At the end I was much easier to close the case and the tolerances are okay.

Thanks Frank!