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Zwo vs IOptron harmonic drive mounts pros and cons

 


Zwo AM5 Harmonic mount drive

Pros 

No counterweight required for under 13 kg payload 

Mount is around 5.5 kg.  

Impressive tracking 

No need to balance the DEC axis

Cons 

Rely on ASI AIR to work properly 

still need a hex key to adjust your altitude pitch angle from 45 to 90 degrees

I have seen a broken azimuth lock-up handle

Polar finder shoe

Price tag 

Around 2300 USD when including the tripod, hand controller (estimate BOM cost of the mount is usd 900 or less)

use of synchronous belt is to increase contact area between the stepper gear and strain wave gear, thus increase the energy efficiency(98% typ). At the same time it also eliminate slippage, but transfers vibration too

Ioptron HEM27 Hybrid mount

Pros

IPolar finder included

Mount is around 3.7 kg, lighter than AM5

No counterweight required for under 13.5 kg payload

Similar ( slightly worse) tracking, probably due to slightly larger backlash from DEC stepper belt motor

Cons

Around 2300 USD when including the tripod, hand controller 

The alt az wedge is bit spartan for adjustment (need hex key)

hand controller needed always ( someone modified to add WiFi, but needed to connect the HC to the mount), or maybe add an iStarFi WiFi?


Real life photo 

The two mounts looked very similar 

Overall, the traditional equatorial mount EQ6R-Pro settles a bit quicker, and around US 2,000 complete with tripod and counterweights, hand controller 

Ioptron HAE29 

Fully harmonic strain wave mount, USD 2000, with ipolar




HEM44EC review 

Comparison of HAE43 vs AM5
 
HAE29

Wido comparison table 

trinamic rssing

TMCStepper github

Bulk metallic glass and lifetime of components 

torsion stiffness

meshing stiffness 

HAE43 vs AM5 tweet

After thought :

Can I use a robot arm to just do the same tracking?

when there's strong wind, all such harmonic drive mount will vibrate, and recover slower than those mounts with counterweights.



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