
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.
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 |
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| 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 |