NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Astra Micrometer Dial Calibration
From: William Sellar
Date: 2011 Jul 21, 12:08 -0700
From: William Sellar
Date: 2011 Jul 21, 12:08 -0700
Greg
Thanks so much. There is a plastic cap on the drum that reveals a screw. Should have figured that myself. Thanks for taking the time to look it up and let me know.
Bill
From: Greg Rudzinski <gregrudzinski@yahoo.com>
To: NavList@fer3.com
Sent: Thursday, July 21, 2011 2:41 PM
Subject: [NavList] Re: Astra Micrometer Dial Calibration
Bill S ,Most sextants have a micrometer drum set screw on the end of the drum which connects the drum to the worm gear shaft. My best guess on the Astra from the YouTube video (http://www.youtube.com/watch?v=kJyDDbQXBE4) is that there is a cap or cover over the set screw on the end of the micrometer drum. If this is the case then 1. Align the index arm mark to any whole degree 2. Loosen micrometer drum set screw 3. Rotate the micrometer drum to the zero mark and tighten but not too tight since there are plastic parts involved. Check your manual to see if there is a parts diagram. Good luck.Greg Rudzinski
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