Porta II adjustments ...
Posted 29 October 2013 - 09:39 AM
When turning either slow motion control, they bind for about half of a rotation of the knob and then free up for the other half of the rotation. I have tried adjusting the radial adjustment screws, but that didn't seem to make any difference. I have tried to loosen the axial adjustment nuts, but neither one will budge. Does anybody have any suggestions on how to adjust this binding out?
I am also trying to adjust the scope so it will balance in altitude. Is anyone doing this? Do I need to attach a dovetail bar to the scope?
Posted 29 October 2013 - 11:22 AM
Posted 29 October 2013 - 01:55 PM
Posted 29 October 2013 - 02:26 PM
On my Zenithstar 71 I just use the longer plate attached to the foot with one allen screw securely tightened.
If you are imaging then removing the foot and using rings and a dovetail is the way to go,hope this helps, Manny Miles stuff is very good by the way, DA.
Posted 29 October 2013 - 05:59 PM
Posted 29 October 2013 - 11:53 PM
Does anyone know how to loosen those axial adjustment nuts on the slow motion controls? To loosen, do they turn counterclockwise or clockwise?
I was playing with the Porta a couple of nights ago in an attempt to lighten the stow motion controls somewhat but ran out of time to fully disassemble and understand the inner workings.
It seems though, that the small set screws hold the adjusters which controls engagement of the worm to the main gear and the set screws also restrain them which controls axial end play of the worm.
Try loosening one set screw and then work the slow motion backward and forward. When I would do this the adjuster would begin to protrude from the housing and the worm gear would gain axial play.
The adjusters also have two spanner recesses to allow worm to main gear mesh adjustment by rotating the adjusters.
Long answer but in summary I believe the adjusters are not threaded, just simply retained by the set screws.
Hope this helps.
Posted 30 October 2013 - 08:50 AM
Posted 30 October 2013 - 12:48 PM