Hi Alexander,
As you can imagine, we routinely design and manufacture custom encoder installation
solutions for ATM's, so we have a wealth of experience in this regard.
By way of background, the existing hardware you have looks as if was made for
something like a German Equatorial where the pulley with the large bore would have
slid over the shaft. The brackets are not something that we would have ever supplied.
When the edge of the mirror box passes over the vicinity of the Az pivot bolt,
how much clearance do you have from that edge to the inside base of the rocker?
What is the thickness of your ground board, the thickness of the base of the rocker
and the dimension of the gap between them?
I suspect that the low profile design of the mount affords very little clearance for the edge
of the rocker to pass over the top of the existing Az pivot bolt.
If it transpires there is at least 32mm of clearance, consider replacing your Az
pivot bolt with one that is 10mm diameter as before but that extends 31mm
taller with a 1/4" diameter shaft. Buy a new pulley with a 1/4" bore to
fit the bolt. A timing belt would then run to the encoder mounted on a different
bracket to what you have but you would retain the existing small pulley you have
on the encoder shaft.
If there is still insufficient clearance, then things can get trickier, but usually the
next thing to start looking at is what clearances can be gained by countersinking
into the base of the rocker box.
Your Alt axis looks straight forward. A coupler would be fabricated to be screwed
onto the Alt trunnion at the exact center of rotation. The coupler would have a socket
head cap screw for quick release of the encoder shaft. A tangent arm would run
from the encoder and have an accurately milled slot in its far end that would mate
with the shoulder on a shoulder screw. This arrangement would then allow
for the Alt encoder and tangent arm to removed or replaced in a couple of seconds
for easy transport of the scope.
Use the pulleys with the large bores for some other project.
Best Regards
Gary Kopff
Managing Director
Wildcard Innovations Pty. Ltd.
20 Kilmory Place
Mount Kuring-Gai NSW 2080
Australia
Phone +61-2-9457-9049
Fax +61-2-9457-9593
sales@wildcard-innovations.com.au
http://www.wildcard-innovations.com.au