Moonlight High Resolution Stepper Motor Quick Start Manual page 9

it adjusted so the focuser can hold the heaviest load presented without slipping and requiring no additional
force. This will give the focuser the best feel and still provide the vertical lifting capacity required. To adjust
the lifting capacity, turn the aluminum thumbscrew located between the two setscrews on the bottom of the
focuser clockwise (CW) to increase load capacity. The aluminum thumbscrew can only add pressure, not take
away pressure. This is due to the 2 setscrews on each side of the thumbscrew applying a minimum set pressure
amount. In some rare case it may be necessary to do a coarse adjustment by turning the 2 setscrews located on
each side of the aluminum thumbscrew (1/8 Allen wrench is needed) a very small amount. Normally, 1/20
turn or less should be made on the setscrews in a CW direction, then check
the lifting capacity pressure by racking the drawtube up and down with your
heaviest load. Note: excessive pressure adjustment over 1/20
crack the bearings!
• Collimation: To adjust collimation, turn the 4 mini
setscrews located in the top part of the 2-part flange. A
small amount of tip/tilt (.015 max) can be made by
adjusting the setscrews. We collimate each focuser
dead on before shipping it so no adjustment should be
required; however, if collimation is required due to
some sort of OTA defect when the focuser is installed,
then the tip/tilt ability of the focuser's flange will come
in handy. Please Note: rotating the focuser will throw
off any collimation reference once the flange is tilted
off plane. So please do not collimate the focuser off
center line unless it is absolutely necessary to fix a
gross error in the OTA.
Performance: To maintain the CF focusers
•
performance, keep all bearing and shaft riding surfaces
clean on the drawtube. All crayford style focusers
require a clean bearing to drawtube surface for smooth
operation. The drawtube has been polished to remove
all machine marks and hard anodized resulting in the
action having a super smooth feel. Keeping the
surfaces clean will keep the focuser operating at
optimal performance. Note: Some wear marks on the
drawtube are normal over regular use and do not cause
any performance issue; however, excessive wear marks
on the drawtube can be seen if the drawtube is not
clean. Airborne contaminates on the drawtube surface
can get crushed between the bearings and the drawtube
surface. The crushed particles will be abrasive causing
the drawtube's anodized surface to wear quicker than normal. Please keep the drawtube clean, especially
in sandy/windy areas.
Reduction Unit: Dual rate focuser owners may want to break in the 8:1 reduction unit by running it up
•
and down when first receiving the focuser. It is adjusted fairly tight at the time of assembly and requires
a little use to come up to peak performance. No maintenance should be required on the reduction unit as
it is packed with lithium low temperature grease for the life of its operation.
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