Wai said:
quite true....the mount got some problem already, need to modify something inside to fine tune it...
All the common mounts by the following manufacturers have IMHO major design flaws:
Celestron
Losmandy (except their biggest mount)
Meade
Vixen
In most cases no amount of fine tuning will fix what are major design flaws and cost cutting exercises eg:
Insufficient shaft diameters to produce the necessary rigidity to ensure flexure is under 5-10 arc seconds.
Bearing centers insufficiently spaced which leads to high radial loading of the bearing journals as well as flexure in the bearing assemblies. (particularly bad on fork mounts)
Incorrect bearing selection and or material choices.
Low quality drive components - eg: Byers wheel/worm sets used in the Meade/Celestron telescopes have terrible natural periodic errors and no amount of electronic compensation will really sort the mechanical problems out.
Equatorial wedges (Meade/Celestron) - God awful heaps of crud, they suffer from massive amounts of flexure, poor design and even lower grade castings.
The other major problem (this one is fixable) with Meade/Celestron Fork mounts as found on the LX series Meades is that the manufacturers cut a massive corner by not helicoiling the base mounting holes on the drive base. Threads in Aluminum are extremely soft and over time the threads strip. In professional engineering/manufacturing it is standard practice to fit helicoils or their equivalent in all threaded holes over 4mm diameter that are subjected to either high loading or constant use. 3 bucks worth of helicoils at the time of manufacture per unit would solve this problem permanently.
As for the OTA's they suffer even worse technical design and manufacturing flaws :devil: