The EVO-zero was developed on the basis of:
•Belt Drive System improved (more rigidity)
•Computer aided design (CAD)
•High quality manufacturing with digital control 5 axes CNC machines (CNC + CAM)
•Absolute quality materials: Anodized aluminium from milled mono-bloc, stainless steel
components and screws, brass components, techno-polymers
The EVO-zero is mainly designed for astro-imaging with medium-short length tubes (such as
SC-Maksutov, RC up to -8″ aperture and 13 kg weight, according to the tube length).
It is possible to use the EVO-zero even with refractors (400-500 mm), with a piggyback.
Thanks to the Belt Drive System improved with more rigidity and double belt tensioner per
axis, with telescopes within the mount payload capability, it is only required to fix the telescope
on the top vixen clamp without perform a fine balancing adjustment.
The use of pulleys and timing belts has allowed to obtain several advantages: a really steady
motion without play (no backlash) and sudden peaks, factors of paramount relevance for long
guided exposures and during high magnification visual observations. These features are of
particular relevance especially for the declination axis motor that can now quickly reverse the
motion without breaks to recover the plays. The timing belts used in the EVO-zero have the
structure made of special material with steel strands to avoid any deformation.
It is important to underline that in the gear-worm systems the motion transmission has only one
tangent point of contact, any errors on each of the two components will, sooner or later, result
into a tracking errors. On the contrary, in the pulley-timing belt system, no direct contact occurs
between the pulley and the motion is transmitted by the belt engaging from 50% to 90% of the
girth surface. Consequently any error, eventually present, is averaged among the cogs,
moreover soft, greatly reducing the tracking error.
No wearing effects since no relevant frictions occur. In fact, all the pulleys and the axes rotate
on roller bearings that allow to reduce the total friction almost to zero.
Another significant advantage of very low frictions is that the risks of motor slipping during
GOTO operation is virtually null. On the contrary, it is well known the difficulty to regulate the
coupling between gear and worm in the conventional mounts. If the coupling is tight the motors
can stuck with consequent loss of the position, if the coupling is too loose the plays increase.
On the other hands, the absence of significant play in the EVO-zero makes the initial calibration
of guiding CCD quick and easy.
Since there are no gears, there is no need of periodical lubrication of the internal components
and therefore the maintenance is extremely reduced and limited to the external cleaning.
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