M140 will be my next generation of mount for a large amateur telescope in the range of 0,6m to 0,7m. It is of the german equatorial type.
The basic components (axis, axis housings, flanges) are manufactured mainly of stainless steel and aluminium alloy (black anodized) to provide maximum protection of the mount in cold, but wet autumn and winter nights typical for central europe.
The diameter of both axis is 140mm at the position of the bearings and 139mm in between. The type of bearing used are the tapped roller bearings of precision class P5 made by FAG.
The first stage of assembling the mounting, the equatorial, was successfully finished in April 2004.
In 2005 the parallactic basis was designed and manufactured of thick aluminium plates (alloy AlMg4,5Mn0,7).
Design now continues with the gear drive including worm wheels for both axis, which have around 400mm diameter and are completely made of bronze, and of the fricton coupling mechanism to the axis.
Below you will find images showing the main parts and the assembling of the cross axis at the workshop. Please click on the thumbnails for a larger image.
 
Parts collection   Polar axis
 
 
Adaptor flange   Polar axis housing
 
 
Declination axis   Declination axis housing
 
 
Polar and declination axis housings   Flange for cradle
 
 
Flange      
 
 
Connection of the declination axis housing to the polar axis: Overall view   Connection of the declination axis housing to the polar axis: Detail view
 
 
Polar axis housing with flange      
 
 
Assembly drawing for the equatorial head   Explosion drawing for the equatorial head
 
 
Assembly of the equatorial head [1]   Assembly of the equatorial head [2]
 
 
Assembly of the equatorial head [3]   Assembly of the equatorial head [4]
 
 
Assembly of the equatorial head [5]   Finished equatorial head
 
 
Equatorial head ready for transport   Equatorial head [1]
 
 
Equatorial head [2]   Equatorial head [3]
 
 
5-axis-milling machine MATEC 30P   Parallactic base:
Milling of the western side plate [1]
 
 
Parallactic base:
Milling of the western side plate [2]
  Parallactic base:
Milling of the western side plate [3]
 
Parallactic base:
Milling of the western side plate [4]
  Parallactic base:
Milling of the western side plate [5]
 
Parallactic base:
Milling of the western side plate [6]
  Parallactic base:
Milling of the western side plate [7]
 
Parallactic base:
Milling of the western side plate [8]
  Parallactic base:
Milling of the western side plate [9]
 
Parallactic base:
Milling of the western side plate [10]
  Parallactic base:
Milling of the western side plate [11]
 
Parallactic base:
Milling of the western side plate [12]
  Parallactic base:
Milling of the western side plate [13]
 
 
Western and eastern side plate of the parallactic base before the surface finish      
 
 
Parallactic base:
Milling of the pole plate [1]
  Parallactic base:
Milling of the pole plate [2]
 
 
Parallactic base:
Milling of the pole plate [3]
     
 
 
Assembly drawing for the parallacic base   Explosion drawing for the parallacic base
 
 
Parallactic base - Overall view [1]      
 
 
Parallactic base - Overall view [2]   Parallactic base - Overall view [3]
 
 
Parallactic base from south   Detail view of the parallacic base
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
Worm wheel and worm   Detail view of worm wheel and worm
 
 
Worm wheels for driving the RA and DEC axis   Detail view showinig the worm wheel
 
 
Worm   Primary Mirror Diameter 25inches (635mm), f=2672,5mm, made by Alluna Optics
 
 
CAD model of the complete mounting   Explosion drawing of the complete mounting
 
 
Friction clutch: Hub with clutch disc   Friction clutch: Counter flange
 
 
Friction clutch: Nut   Friction clutch: Nut with levers
 
 
 
 
 
 
 
 
  Drive Unit (CAD image)
 
 
Drive Unit - Motor subassmbly [1]   Drive Unit - Motor subassmbly [2]
 
 
Drive Unit - Bearing block   Drive Unit - Bearing of the worm (CAD section view)
 
 
Drive Unit - Bearing block with worm assembled   Testrun of the partly assembled drive units with the FS2 electronics
 
 
The completed Drive Unit [1]   The completed Drive Unit [2]
 
 
The completed Drive Unit [3]   Assembly of the Drive Unit RA
 
 
The assembled Drive Unit RA   The assembled Drive Unit DEC
 
 
The nearly completed Mounting [1]   The nearly completed Mounting [2]
 
 
The first part of the tube installed on the mounting   25inch telescope with observer of 1.90m body height
 
 
Secondary Mirror Rotator   Secondary Mirror Support and Spider vanes
 
 
Secondary Mirror Support   Spider vanes fixture to Front Ring
 
 
3D CAD Model of the complete 25inch telescope   Primary mirror cell
 
 
Secondary Mirror Unit   Testassembly of the tubus


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