Variations on a Theme
The TwinDisk principle - parallel heads, glued to the top and bottom skins of a panel or floor to form a ‘box girder’ mounting for a fastening - is highly adaptable. Within the classic BigHead range, for example, are the constituents for tailoring a TwinDisk to virtually any depth and strength of material. If cosmetic looks are not important, the TwinDisk’s unpierced top head can be replaced by a traditional, pierced, BigHead disk; these are made in diameters of up to 70mm.
- Deep-section panels/flooring
Our picture sequence shows a 55mm-deep section of alloy flooring - used typically in marine and transport decks and floors. The basic procedure remains unchanged; a 30mm hole (in this case) cuts the honeycomb core away, down to the bottom skin. Ideally, the width/height aspect ratio should be around 1:1; for maximum lateral stability in this sample, we recommend a bottom disk of 50mm diameter and a top disk of 60mm/70mm.
- For alloy or composite skins
The TwinDisk principle can be utilised regardless of panel material, with aluminium and other alloys posing no structural adhesion problems. The potential for bi-metallic galvanic corrosion with 316 stainless steel is minimal, and a generous adhesive film thickness effectively prevents any contact
between the two different metals.
- Up to M16 studs for Heavy Duty use
With a bottom disk diameter potentially as large as 60mm (or even larger if required, to special order), it is also perfectly feasible to use thread sizes of up to M16 for maximum lateral stress resistance. These can be in either male or femal threadform, with male versions supplied in any length from 20mm up to 150mm.
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The main hole is cut down to the
