| General > General Technical Chat |
| LED clearance |
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| ledtester:
There is panel mount hardware for LEDs like this: Lets you adapt to slight variations in LED dimensions as well as securing the LED in place. |
| Ian.M:
Ask the <expletive> customer whether they need a push fit or a clearance fit. Warn them they may have to ream the holes if they need a push fit. For a clearance fit, 3.5mm and 5.5mm should do nicely as typically good quality LEDs have a diameter tolerance of 1 thou, (0.25mm). If your mill or drill press has a bit of runout and tends to drill oversize, you may need to go down to 3.2mm for the 3mm LEDs |
| jfiresto:
--- Quote from: Ian.M on September 17, 2020, 03:26:12 pm ---... typically good quality LEDs have a diameter tolerance of 1 thou, (0.25mm).... --- End quote --- The Everlight 3mm LED datasheet I recently looked at (Taipei, March 2006) gave 3+/-0.2mm (+/-8 thou). |
| Ian.M:
OUCH!! That (+/- 8 thou) would make a reliable push-fit impossible in any sort of rigid panel. WTF are they doing to get that sort of size variation? Are they running their encapsulation machine without maintenance till the mold's so worn it produces a vaguely cylindrical blob? |
| jfiresto:
I am puzzled why Everlight is lax about the diameter: it is a flat top, cylinder LED. The datasheet notes that "without special declared, the tolerance is±0.25mm." |
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