| We continue
here with Part 2 of the Construction of the SAO 10" Newtonian Fork Mount
with the
attachment of the left and right fork arm tip braces. As mentioned at
the end of Part 1 of this section, they double the
thickness of the placement spot for the Declination Axis Hanger
Bearings.
Note that now the holes have been drilled to receive the bearings, which
the bearings will be used on both sides of each arm tip. There is total
of four of these 5/8" inch I. D. shaft hanger bearings. The central holes
in the braces are slightly larger than the 5/8" inch diameter by 7" inch long precision ground
stainless steel shafts. The two flanking holes are 3/8" inch in diameter to
accept the bearing mounting hardware. The cradle will ride between the arms and
will be attached to the fork by means of two cast aluminum 5/8" inch I.D. motor arbors. A friction clutch mechanism on the declination axis
will allow for smooth slewing in locating of celestial objects. |
|
