ALT7 AD Equatorial Mount

Due to other requirements I'm sold my ALT7 AD mount that has served me well for over 20 years.

I leave the following page on my site for information purposes.

Diameter of the axes: 70 mm
Wormwheel diameter, RA and Dec 272 mm
160 mm
Number of teeth wormwheel, RA and Dec: 270
210
Graduated circles diameter 180 mm
Graduated circles division 5 min/1 degree
Read precision graduated circles (with nonius) 10 arcminutes
Telescope capacity (instrument only, depending on length 100 kg
Weight of the mount only 91 kg
Mount is the version with precision ground axes and worms  

Plans of the mount support to make a pier adapter.

 

Declination axes, graduated circles, telescope dovetail .

Declination clutch, declination motor housing opened to allow mounting of the Escap P530 motor.

Motor Escap P530 déclination. Original motors were Berger type motors, not available anymore.

Paint detached on declination motor housing.

The big black wheel is the RA clutch, presses on a conic coupling for smooth action, once set to correct pressure no need to loosen clutch to move telescope, only loosen for balancing purposes.

RA wormwheel, 290 mm diameter.

RA worm, similar system in declination but smaller wormwheel. Motor to worm coupling are Oldham couplings.

Original motor plugs are damaged while trying to remove them, not used with the new motors.

RA setting circle with nonius, Dec setting circle is the same.

Big nuts on both side hold the mount on the support, covered normally.

Azimuth adjustment is done by screws acting on a fixed pin on the pier adapter.

Altitude adjustment is done by two push screws allowing +/- 2° adjustment around 51° design altitude, somount can be used between 49°-53° latitude.

FS2 Goto controller and cables. FS2 is the 40 V version with autoguider option included. However when using SBIG cameras you will need a SBIG Relay Adapter Box between camera and FS2.

Periodic error in arc seconds measured in 1999.

The main sizes of the mount: