View Single Post
  #95  
Old 24-07-2009, 09:39 PM
kinetic's Avatar
kinetic (Steve)
ATMer and Saganist

kinetic is offline
 
Join Date: Jun 2008
Location: Adelaide S.A.
Posts: 2,293
Quote:
Originally Posted by Spanrz View Post
Is the cyclic wobble from the gear itself, or the shaft (talking about a slightly bent shaft)?
Brett,

it is either from a non concentric worm in the carriage or the
toothed belt pulley on the end being non concentric.
Either way, I'm happy it's cyclic and the only substantial PE.
Seems the worm gear accuracy doesn't even come into it.
I have attached some shots of the jury rigged reduction which
is driving the worm at the moment.

Also attached are two old favourites from earlier tonight.
PEC was turned on for both shots but only sharpening applied to
the NGC5139 result. Seeing was only average, some high thin cloud.

Steve
Attached Thumbnails
Click for full-size image (reduction_1.jpg)
83.1 KB419 views
Click for full-size image (reduction_2.jpg)
103.5 KB428 views
Click for full-size image (5139qm_crop_hist_umask1.jpg)
187.1 KB165 views
Click for full-size image (5128_cr_qm_nosharpen.jpg)
123.4 KB179 views
Reply With Quote