The Linear mount is specifically designed for astrophotography, with some peculiar features:
- Excellent performances in guided imaging, even with high focal lengths, up to 3 metres
- Simple and original design
- Really portable and lightweight, with its useful handle and a weight of only 12 kg (26,4 lb) , without counterweight and bar
- Payload capacity up to 20 kg in imaging (best choice 15/18 kg). High quality manufacturing, all parts are being designed for long lasting use, made of anodized aluminium and stainless steel, directly milling obtained from single blocks thanks to high precision 5 axes CNC machines.
- Reliable and performing
- Apart mounts built in China, the Linear is the cheapest mount, among those with the same capacity in the whole world.
Pulleys and toothed belts, zero backlash!
This choice 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: from here the name FAST REVERSE. The toothed belts used in the Linear have the structure made of special material with steel strands to avoid any deformation, elongation and stress, much better than those used in the automotive engine distribution system (which are generally made of rubber with nylon strands). Considering that the service time for the automotive toothed belts is around 100.000 km (60.000 miles), assuming a medium regime of 2.000 rpm and thermal stress from 0 to 90°C (30 to 195 F) in a few minutes, we can think that the life cycle of the Linear toothed belts will be extremely long! 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-toothed 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. These features allow the Linear to perform guided exposures up to 20-30 minutes with pinpoint stars even with optics of 2-3 meters of focal length.
No wear, no frictions!
No wearing effects since no relevant frictions occur. In fact, all the pulleys and the axes rotate on roller bearings, 13 for the RA axis and 13 for the DEC axis 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 Linear makes the initial calibration of guiding CCD quick and easy.
Avalon Instruments Linear Wi-Fi mount with StarGO - scope of delivery:
- Linear mount
- StarGO Wi-Fi control computer
- Illuminated polar scope
- 12V 4A power adapter
- User manual