Altazimuth Fork Mounts

3
MI-500A Altazimuth Base

We offer three models of altazimuth fork mounts: MI-500A, MI-750A, and MI-1000A. We also offer three hybrid models that feature a larger fork on a smaller azimuth base. These model are intended for those needing larger swing-through and greater arm separation for tube assemblies of modest weight.

The hybrid model are the MI-500A azimuth base with MI-750 fork, the MI-750A azimuth base with a MI-1000 fork, and the MI-1000A azimuth base with a MI-1250 fork

The azimuth base houses the azimuth axis, bearing assembly, drive gear, and servo motor. The fork assembly bolts to the top of the azimuth axis. The fork includes the altitude axis, fork bearings, drive gear, and servo motor.

Altazimuth forks are particular attractive in situations where the enclosure is small and space is at a premium. These mounts have a small footprint. You can get more telescope into a fixed enclosure than with any other type mount.

 

Azimuth Base Specifications

Model

MI-500 & MI-500/750

MI-750 & MI-750/1000

MI-1000 & MI-1000/1250

Lower Base Plate
12.0 inches round
14.0 inches round
18.0 inches round
Azimuth Base
10.0 inches round
12.0 inches round
16.0 inches round
Azm Gear Dimensions
12.1 inch diameter, 360 teeth,
bronze or aluminum
15.1 inch diameter, 450 teeth,
bronze or aluminum
20.1 inch diameter, 600 teeth, bronze
Worm Dimensions
1.20 diameter, stainless steel,
30 diametrical pitch
1.50 diameter, stainless steel,
30 diametrical pitch
Diameter of Azm axis
100mm
130mm
160mm
Upper Bearing
100mm x 150mm
130mm x 180mm
160mm x 220mm
Height
6 inches
7 inches
8 inches
Payload
160 lbs, 73 Kg
120 lbs recommended
220 lbs, 100 Kg
180 lbs recommended
320 lbs, 145 Kg
280 lbs recommended
Weight
100 pounds, 45 Kg
140 pounds, 64 Kg
220 pounds, 100 Kg
Color
White with Blue Tint
White with Blue Tint
White with Blue Tint

 

MI-500 Altazimuth

MI-1000 Altazimuth

Altitude Fork Specifications

Model
MI-500
MI-750
MI-1000
MI-1250
Arm Separation
14 to 20 inches
18 to 28 inches
24 to 38 inches
30 to 38 inches
Swing Through
16 inches
18 inches
24 inches
27 inches
Flange Diameter
5.5 inches
6 inches
6.5 inches
7.0 inches
Fork Hub Width
6 to 12 inches
8 to 16 inches
12 to 20 inches
12 to 20 inches
Altitude Gear Dimensions
10.1 inch diameter, 300 teeth, aluminum
12.1 inch diameter, 360 teeth, bronze or aluminum
15.1 inch diameter, 450 teeth, bronze or aluminum
15.1 inch diameter, 450 teeth, bronze or aluminum
Worm Dimensions
1.20 diameter, stainless steel,
30 diametrical pitch
1.20 diameter, stainless steel, 30 diametrical pitch
Diameter of Dec Axis
80mm
100mm
120mm
120mm
Fork Bearings
80mm x 100mm
100mm x 125mm
120mm x 150mm
120mm x 150mm
OTA Interface
dovetail
dovetail
dovetail or custom plate
dovetail or custom plate
Overall Height
25 inches
30 inches
35 inches
38 inches
Fork Weight
70 pounds
120 pounds
180 pounds
240 pounds
Color
White with Blue Tint
White with Blue Tint
White with Blue Tint
White with Blue Tint