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