Equatorial Fork Mounts

We offer 3 basic models of fork mounts: MI-500, MI-750, and Mi-1000. We also offer hybrid models that feature a larger fork on a smaller polar 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-500 polar base with MI-750 fork, the M-750 polar base with a MI-1000 fork, and the MI-1000 polar base with a MI-1250 fork.

Polar Assembly Specifications

Model

MI-500 & MI-500/750

MI-750 & MI-750/1000

MI-1000 & MI-1000/1250

Base Plate
10.5 inches round
14.0 inches round
15-inches x 21 inches
Altitude Adjustment
8 degrees
6 degrees
6 degrees
Azimuth Adjustment
8 degrees
6 degrees
5 degrees
Latitude Range
25 to 56 degrees
25 to 56 degrees
25 to 56 degrees
RA 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
1.20 diameter, stainless steel,
30 diametrical pitch
1.50 diameter, stainless steel,
30 diametrical pitch
Diameter of RA axis
100mm
130mm
160mm
North Bearing
100mm x150mm
130mm x 180mm
160mm x 220mm
Height
16 inches
21 inches
28 inches
Payload
150 lbs, 68 Kg
120 lbs recommended
200 lbs, 90 Kg
170 lbs recommended
320 lbs, 145 Kg
280 lbs recommended
Weight
100 pounds, 45 Kg
140 pounds, 64 Kg
220 pounds, 100 Kg
Color
White/ Hint of Blue
White/ Hint of Blue
White/ Hint of Blue

 

MI-500F

1MI-750F

MI-1000F

MI-500/750 with CDK17

MI-750/1000 with RC 20

MI-1000/1250 with CDK24

 

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
Dec 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
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
35 inches
Fork Weight
70 pounds
120 pounds
180 pounds
240 pounds
Color
White/ Hint of Blue
White/ Hint of Blue
White/ Hint of Blue
White/ Hint of Blue