13. TMCs
honeycomb core is made of 0.010 in. (0.25 mm) thick steel, work-hardened
and plated to prevent corrosion and assure years of service. Steel
honeycomb is the ideal material for optical tops since the Youngs
modulus of steel is three times that of aluminum. |
14. TMCs
honeycomb core is a closed-cell structure with basic cell size of
0.5 in.2 (3 cm2), giving a core density of
13-14 lbs/ft3 (300 kg/m3), significantly greater
than others on the market. The effective core density is 18-20 (16
lbs./ft3) including sidewalls and dampers.
TMC's honeycomb core.
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15. Our
honeycomb structures are totally TMC-manufactured, assuring reduced
manufacturing cost, top quality, and dimensional precision.
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| 16. The
core, skins, and sidewalls of TMC tops are rigidly and permanently
bonded with specially formulated high-strength epoxy, which has no
viscoelastic creep or hysteresis. The overall shear modulus of TMCs
finished, bonded core is 275,000 psi (19,300 kg/cm2). |
17. The
stainless steel version of TMC's CleanTop ® II cups offers the
ultimate in an unbroken stainless steel barrier. This design renders
the top immune to even repeated spills of the most corrosive liquids. |
18. Structural
damping of TMC tops is accomplished using broadband mass dampers
which are separate from the core, do not permit hysteresis or creep
of the top, and do not detract from the tops stiffness. |
| 19. Our
unique, direct core-to-top bonding improves the thermal conductivity
of the core to the outside environment, reducing the "thermal
relaxation time" for the top. |
20. Our
skins, core, sidewalls and dampers are all made of steel and therefore
have the same coefficient of thermal expansion. Thus, even in situations
with repeated temperature cycling, a TMC top expands and contracts
as a whole, assuring structural integrity and preventing long-term
internal stress buildup. |
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the first 12 reasons to choose a TMC Optical Top |