Quote:
Originally Posted by bojan
It uses expandable rubber rings to obtain grip around barrel (they probably expand because of axial pressure).
It might not be as repeatable and as rigid as claimed.. possible temperature issues? therefore too expensive...
But perhaps it is worth checking..
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All hydraulic [oil] technology works at high pressure and high temperatures mostly. I remember in my short time working with Liebherr and Klem Hydraulic hammers that everything that had a moving piston had those centering groves and series of O'rings and composite material rings ... and these hammer drills used to hit at 2000 hits per minutes with pressures exceeding 400 bars so it was critical everything was aligned with very tight tolerances. So I recon the focuser grip with 3 O'rings will stay centered no matter what once it's "clamped in"
