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Eurorack panel components: Difference between revisions
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Front panel dimensions in the the [[3U]] Eurorack format are specified in U and HP not in inches or millimeters. One U (unit) or in German HE (höhen einheit) is 1.75 inches equivalent to 44.45 mm. Thus the panels height is 5.25" (133.35 mm) less any allowance for mounting rail flange. Width is measured in HP (horizontal pitch) or in German TE (teilungs einheiten); 1 HP is 1/5" (0.2", 5.08 mm or 200 [https://en.wikipedia.org/wiki/Thousandth_of_an_inch mil]). The actual width of a front panel is a few tenth of a mm less than whatever multiple of 5.08 mm it is, to give some tolerance for final assembly. A [[19-inch rack]] has a usable width of 84 HP.<ref name="hinton" /><ref name="a100m" /><ref name="confused">[http://www.muffwiggler.com/forum/viewtopic.php?t=55022&start=all&postdays=0&postorder=asc confused about euro panel spec standard.], Muff Wiggler forum, March 2012</ref><ref name="measures">[http://www.electro-music.com/forum/viewtopic.php?t=18281&postorder=asc Standard measurements in front panels], Electro-music.com forum, May 2007</ref><ref>[http://electro-music.com/forum/viewtopic.php?t=17529&start=125 Thomas Henry's SN76477 Super Controller Module] by [[Matthias Herman]], Electro-music.com forum, July 2007</ref>
The vertical distance between the mounting holes on Eurorack rails is 122.5mm apart (4.823"). Based on the manufacturer's drawings for the most common rails used in Euro cases, the clear space between pairs of rails is:▼
* Schroff, 112.2 mm (4.415 inches)
* Gie-Tec, Proma (now defunct) and TipTop Z-Rails, 112.5mm (4.429 inches)
* Vector, 115.1mm (4.531 inches)
These don't include a tolerances for the screw hole in the panel
=== Panel mounting holes ===
If the Doepfer specification is followed, or rails with sliding nuts are used, elongated holes are not required. These are useful for non-standard panel widths and to compensate for for manufacturing tolerances of the panel width or hole position. They help to fit the modules flush against one another.<ref name="oval">[http://www.muffwiggler.com/forum/viewtopic.php?t=126980 Euro modules – Oval mounting holes], Muff Wiggler forum, December 2014</ref> In a double width case, there will be a gap where the two threaded inserts meet, unless e.g. single 168 HP tiptop Z rails are used.<ref>[http://www.muffwiggler.com/forum/viewtopic.php?t=69180 The Eurorack Charter?], Muff Wiggler forum, October 2012</ref>
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For front panels up to 10 HP (2 inches) two mounting holes are sufficient, wider than this and four mounting holes are usual. To attach the modules to the mounting rails M3x6 DIN 7985 cross recessed pan head machine screws are used. The mounting hole diameter is 3.2mm (0.13"), centered 3mm from top and bottom edges and 7.45mm from the left edge. The right hand mounting holes are an increment of 5.08mm, (1 hp) from those on the left. It is normal for left and right holes to be at different distances from the panel edges.<ref name="hinton" /><ref name="a100m" /><ref name="confused" /><ref name="stds"/>
▲The vertical distance between the mounting holes on Eurorack rails is 122.5mm apart (4.823"). Based on the manufacturer's drawings for the most common rails used in Euro cases, the clear space between pairs of rails is:
=== Blank panels ===
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