N23 (Shift 0, Left zero well—with thanks to the QRDUDE Calculator!)
Design frequency: 994 hz, Number of wells: 23. Deepest well: 135mm, Well Width: 40mm, Fin width: 2.5mm; Theoretical panel width: 977.5 mm
TABLE (mm scale): A=Well Depth, B=Theoretical Cut Depth for Foam (+Facing=2.5mm), C=Well #, D=Actual Cut Depth (@+1mm for perfect cut)
|
A |
0 |
7 |
30 |
67 |
120 |
15 |
97 |
22 |
135 |
90 |
60 |
45 |
45 |
60 |
90 |
135 |
22 |
97 |
15 |
120 |
67 |
30 |
7 |
|
B |
132.5 |
125.5 |
102.5 |
65.5 |
12.5 |
117.5 |
35.5 |
110.5 |
-0- |
42.5 |
72.5 |
87.5 |
87.5 |
72.5 |
42.5 |
-0- |
110.5 |
35.5 |
117.5 |
12.5 |
65.5 |
102.5 |
125.5 |
|
C |
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
|
D |
133.5 |
126.5 |
103.5 |
66.5 |
14.0 |
118.5 |
36.1 |
111.5 |
X |
43.25 |
73.25 |
88.5 |
88.5 |
73.25 |
43.25 |
X |
111.5 |
36.1 |
118.5 |
14.0 |
66.5 |
103.5 |
126.5 |
Cost, Space & Build Savings.
Our approximate frame size: 94cm H x 99cm L (@ 3’ x 3’3”) is:
1) A lot easier to DIY build than something larger (we first tried at 135cm length),
2) They are modular. So we made:
3) Wells 0 & 22 use 30mm (not 40mm) foam inside the left/right frame, connected to the 12mm left/right frame members (=4.2mm well segment)
4) As a result, the left/right frame members fit inside the top/bottom frame members; left is 135mm D (reduced -2.5mm), right: 128. mm D (reduced -9.5mm):
5) That is, well faces go over the left/right frame members, as they are part of the zero and #22 wells.
DIMENSIONS
Frame Material = 12mm D x 1820mm L x 910mm W Plywood Panel (rip strips pf 13.75cm x @94cm from it)
Backing = 96.5 L x 91.5 W
Frame = Depth: 12 mm (each) x 137.5mm
Well Segments inside Frame (well-segment = 40mm well + 2.5mm fin divider = 42.5nm):
21 wells (40mm), 2 wells (30mm) 23 fins (@2.5mm each)
Build Constant: Actual build fit is between 0.5mm-0.6mm over theoretical, per well. 14mm is added to the total panel length (0.6mm x 23)
BUILD NEEDS
1) 30mm XPS foam spacer on left side (zero well on left side joins with left-side frame); 30mm XPS in last well (23rd well) -- joins to right-side frame)
2) Cut left-frame depth down 2.5mm, cut right-frame depth down 7mm.
3) Foam wells: Dow Chemical XPS ‘Blueboard’, 40mm x 1820mm x 915mm (marked as 910mm)
4) Extra sheet of 40mm XPS foamsheet for well spacers (used during the fitting/gluing process)