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Crux 170HD Harmonic Drive Mount Up to 18kg Capacity

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45.00 kg
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including VAT 20.00 % ( £954.83 )

Due to popularity, this mount is usually available from UK stock (but just in case, please contact us before you place an order...)

The South Korean made Crux mounts feature Japanese/German made 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 can be very accurate
  • The motor is very compact and therefore allows a small form factor, resulting in less bulk and weight.
  • 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 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 otherwise it would be top heavy
  • 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.

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 170HD is probably the ultimate in medium capacity mounts. It weighs only 4.7kg. It is a fully GoTo enabled system which includes a 12000+ object database. Without any counterweight the mount has a load capacity of 8kg. By adding a 2.7kg counterweight, the maximum capacity is increased to 18kg. This capacity is rated for imaging.

The '170HD', 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. Potentially as low as 0.1 arc sec. As part of our service, we PEC train 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.

General Specifications - Crux 170HD

Type German Equatorial
Azimuth Adjustment Range +/- 10°
Altitude Adjustment Range 18 to 55°
Weight (excl counterweight) 4.7kg
Optional Counterweight 2.7kg
Max Load (No Counterweight) 8.0kg
Max Load (with 2.7kg Weight) 18.0kg
Power Source 12V DC
Telescope Mounting Format M8 35mm Pitch (Takahashi Standard)
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
Titan TCS Controller  
Size 83x87x36mm
Input Power 12-30V DC
Protocol LX200
Database NGC,IC,Messier, Planet 12000+ Object
Power Consumption (Tracking) 12V 0.3-0.5A
Power Consumption (Max Slew) 12V 1.5-2.0A
Wireless Connectivity Bluetooth (WiFi to be added)
Interface RS232 / USB / ST4 Guide

 Please note, images are for demonstration purposes only. Clamp, counterweigth shaft and counterweight are available separately.

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