NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Bubble sextants on e-bay
From: Gary LaPook
Date: 2009 Jun 6, 15:29 -0700
From: Gary LaPook
Date: 2009 Jun 6, 15:29 -0700
The shaft that the index prism rotates on is a tapered fit and freezes up in the bearing. Remove the averging disk on the right and the plate underneath it. You will see a screw surounded by a ring near the top, this screw is on the end of the shaft and must be removed. Then remove the ring and don't loose the small pin that sticks out of the end of the shaft and goes into a matching hole in the ring. Then disassemble the other side of the instrument and remove the plates on the inside. You can now see the index prism shaft. Note the spring that wraps around the shaft, this is to eliminate backlash, note how it goes and it is difficult to get back into place. Now you can drift out the shaft. when you reassemble it put grease on the tapered shaft, not oil. If the bubble is ok you are probable done with the repair after you have freed the prism shaft. gl On Jun 6, 2:30�pm, jean-philippe planaswrote: > Dismantel the index prism from the shaft, then hit the shaft with an energetic tap from the side opposite to the mirror after taking out the screw and washer (and thin pin if present) and it'll yield. > > --- On Sat, 6/6/09, NavL...@fer3.com wrote: > > From: NavL...@fer3.com > Subject: [NavList 8540] Re: Bubble sextants on e-bay > To: NavList@fer3.com > Date: Saturday, June 6, 2009, 3:47 PM > > I aquired a > 'frozen" A10 sextant do you have any guidelines to repair it or should I just forget it. I like to repair things and thought it would be a good project. Any help? Thanks! > -------------------------------------------------- > [Sent from archive by: ejkrohnmail-AT-charter.net] --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---