NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: HR1 Sliderule locking mechanism questions
From: Brad Morris
Date: 2013 Feb 10, 15:57 -0500
From: Brad Morris
Date: 2013 Feb 10, 15:57 -0500
Hi Wolfgang
The lock to unlock turn is very slight. It also works independently of gravity. I can hear a click noise when I turn to unlock, at the very opposite end of the tube where it interacts with Tube I.
Possibly a cam? Many other concepts are ruled out as the turn is about 30 odd degrees.
Regards
Brad
On Feb 10, 2013 3:20 PM, "Wolfgang Hasper" <wolfgang.hasper@web.de> wrote:
I am still curious as to what mechanism is behind the original tube lock... Pondered it quite a while. The apparent sensitivity to a special adjustment makes it unlikely that my cam idea is the true explanation. I thought about a set of radial knee levers that could offer the advantage of giving an inherently stable locked position...? Brad, from the feel of the locking process is there any indication of how it might work? Gary's sqeezed-rubber stopping mechanism seems to present an unlikely explanation as apparently these locking mechanisms work even after 70 years when rubber has usually turned hard and unflexible... Any suggestions welcome. Best regards Wolfgang Am Sonntag, 10. Februar 2013 19:48 schrieb Robin Stuart: > Brad, > Thanks very much for the HiDef photos and > explanation. Please don't do anything that would > damage your treasure. Does the height of the locking > knob rise when turned from the fully unlocked to > locked position? If so this would indicate that it > is on a screw probably pulling a tapered plug into a > constriction at the base of the (co)tangent tube as > opposed to turning a cam which was a solution that > Wolfgang Hasper had implemented, Regards, > Robin > ---------------------------------------------------- >------------ NavList message boards and member > settings: www.fer3.com/NavList Members may > optionally receive posts by email. To cancel email > delivery, send a message to NoMail[at]fer3.com > ---------------------------------------------------- >------------ > > > > > : > http://fer3.com/arc/m2.aspx?i=122311