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RoonMatrix Part 3: U-Profile drill processing

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Category: Roonmatrix
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The stainless steel U-profile must be shortened from a length of 100cm to 76.6cm.
In addition, some holes are required, namely:

  1. A hole for the power connection (11 mm)
  2. Two holes for the two mounting hooks (4 mm)
  3. Two holes for attaching the acrylic glass pane (3 mm)
  4. Four holes for the Raspberry Zero 2W circuit board (2.5 mm)
  5. Four holes for the LED modules (3 mm)
  6. Optional: Further holes for mounting with magnetic hooks
  7. Optional: three holes for micro-USB port


In the picture you can see the position of the holes and their drilling diameter.
It is best to determine the exact positions directly on the object.
More on that later.

U-profile holes, left side (top left drill for mounting hooks, including for the acryGlass pane. Right next to it the 4 holes for the Raspberry Zero, next to it the two holes for the LED modules).

 

U-profile holes, right side (top right drill for mounting hooks, including for the acryGlass pane, next to it on the left the two holes for the LED modules.)

 

It may be better to have the holes drilled by a specialist company for metalworking, which has the necessary machines to drill in stainless steel.
That doesn't have to be expensive. With a little luck, a small donation to the coffee box is enough, as in my case.
The protective film on the U-profile back should not be removed beforehand so that the profile does not get scratches during the drill and deburring process.

After the drilling, the U-profile should look roughly like this:

 

U-profile after drilling, left side

 

U-profile after drilling, right side
 
If you want to attach the roon matrix with magnetic hooks to a TV rack, for example, the mounting with only 2 magnetic hooks may not be sufficient due to the weight. In this case you should drill further holes.
In my case, 4 magnetic hooks were enough, two magnetic hooks may be a little too few.
In all cases (and as a reserve) you should perhaps provide 4-8 holes at a even distance.
U-profile with further holes for mounting

 

The drilling positions

 

Download of the technical drawing (DXF file, was created with QCAD):

 

The RoonMatrix can optionally be expanded with a Bluetooth audio module .
This is connected to the micro USB port of the Raspberry Zero 2W.
In this case, you have to lead the port to the outside, as there is not enough space for the module in the U-Profile case.

The micro-USB port is routed to the outside via a small adapter board.
To do this, a hole for the port must be drilled in the U-profile and filed out so that the port fits through the hole.
Then mark and drill the two M3 holes for the screw connection of the adapter board.

The micro USB adapter board

 

Holes for the mico USB adapter board

The picture shows a prototype where the hole for the USB port was not optimally filed. Of course, you can do better than that. :-)

The pins from the micro USB port of the Raspberry Zero 2W must be connected 1: 1 to the connections on the adapter board.
The procedure for cabling is described in  RoonMatrix Part 12: Bluetooth Audio Module Option more precisely.

 

 

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