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Step 4Drilling the bolt holes
Now you need to drill holes for the bolts that will hold the pad together. The important point is that the holes in the metal sheet are 10 mm whereas the ones in the wooden frame are 5mm, so the metal sheet is held in place just by the pressure of the rubber mounts, and is free to move up and down.
Each hole is in line with the centres of the piezos, 10 mm from the piezo's edge. This translates to 22.5 mm x 50mm from each corner. There are 2 bolt holes at each corner.
It is easiest if you start with making the holes in the aluminium (which are 10mm), and then use this as a template for the top frame and the base. This way, any mistakes in drilling the aluminium won't matter so much as the holes will still line up. The top frame and base need 5mm bolt holes to match the machine screws. Mark each sheet with an arrow on one edge before drilling to show the alignment, so you will be able to line them up the same way each time.
Each hole is in line with the centres of the piezos, 10 mm from the piezo's edge. This translates to 22.5 mm x 50mm from each corner. There are 2 bolt holes at each corner.
It is easiest if you start with making the holes in the aluminium (which are 10mm), and then use this as a template for the top frame and the base. This way, any mistakes in drilling the aluminium won't matter so much as the holes will still line up. The top frame and base need 5mm bolt holes to match the machine screws. Mark each sheet with an arrow on one edge before drilling to show the alignment, so you will be able to line them up the same way each time.
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