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HOBYM Observatory Crux 200HD Harmonic Drive Mount
HOBYM Observatory Crux 200HD Harmonic Drive Mount
HOBYM Observatory Crux 200HD Harmonic Drive Mount
HOBYM Observatory Crux 200HD Harmonic Drive Mount
HOBYM Observatory Crux 200HD Harmonic Drive Mount
HOBYM Observatory Crux 200HD Harmonic Drive Mount

HOBYM Observatory Crux 200HD Harmonic Drive Mount

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Product Code
HOBYM Observatory
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Crux mounts feature Harmonic Drive Tecnology. This tecnology gives Crux mounts the following advantages over traditional drive systems for astronomy applications;

- They have zero backlash and therefore pointing and guiding is very accurate

- They have very high torque. This makes it ideal your use with all loads. For instance the length of a refractor normally requires a much more powerful mount than a typical weight capacity suggests. The load limits for Crux mounts are for all types of telescopes and also for imaging

- The motor is very compact and therefore allows a small form factor, resulting in less bulk and weight.

- Harmonic Drive motors are very responsive and therefore react instantly to guiding commands. When combined with the zero backlash this allows for extremley accurate tracking. There is none of the high frequency oscillation normally associated with traditional drive systems.

- The high torque of the motor permits use without a counterweight, further reducing the overall weight. If a counterweight is added, the load capacity can be increased significantly. Note that this counterweight is not used to balance the telescope in the normal way. It is simply helping the drive system and making the load safer to avoind it being top heavy.

Please see the short video below for an explanation of how the Harmonic Drive system works. Motors for Crux Mounts are supplied by Harmonic Drive Systems Inc of Japan, a sister company to Harmonic Drive Systems AG.

The Crux 200HD is a true observatory class mount system but one which is also portable. It weighs only 11.5kg yet can be used with telescope systems up to 40kg!. It is a fully GoTo enabled system which includes a 12000+ object database. Without any counterweight the mount has a load capacity of 18kg. By adding a 5.0kg counterweight, the maximum capacity is increased to 35kg. If a 15.0kg weight is added, the capacity increases further to 40kg.

The '200HD', as with all Crux mounts is provided with a mounting point for a QHY Polemaster. No adapter is needed. This makes polar alignment using the built in Altitude and Azimuth controls very simple.

Supplied with all Crux Mounts is the Titan TCS Controller. This provides GoTo functionality and all other mount control and connectivity. It is based on the LX200 protocol and is therefore fully ASCOM and INDI compliant. It also features wireless connectivity in the form of Bluetooth, with WiFi being added shortly. Thus is allows easy integration with Tablet applications such as Sky Safari.

One significant function of the Crux mount and TCS Controller is PEC training. This is where, using a guide system (like PHD2), the drive system is trained. This, once completed permanently (unless reset by the user) lowers the PE of the mount to typically +/- 2-5 arc seconds dependent on the mount. This enhanced error can then be combined with guiding leading to extremely low PE of typically 0.1 arc sec. As part of our service, we set the PE of each mount before delivery so you receive a mount that is capable of operating at its best, straight out of the box. A copy of the PE test data is also provided.


Specifications: HOBYM Observatory Crux 200HD Harmonic Drive Mount

Type German Equatorial
Azimuth Adjustment Range +/- 10°
Altitude Adjustment Range 13 to 60°
Weight (excl counterweight) 11.5kg
Optional Counterweight 5.0kg
Max Load (No Counterweight) 18.0kg
Max Load (with 5.0kg / 15.0kg Weight) 35.0kg / 40.0kg
Power Source 12V DC
Telescope Mounting Format M10 Screws
Polar Alignment Polemaster Mounting plus secondary mounting
Protection Hard Case Included
Backlash Zero
PE Error after PEC Training +/- 2-5 arc sec
High Speed Slewing x1000

What's in the Box

What's in the Box: HOBYM Observatory Crux 200HD Harmonic Drive Mount

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