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In Reply to: RE: I'm grateful posted by amioutaline? on May 17, 2014 at 17:09:49:
Thanks for sending the link but I have a Mac so can't execute.What I did do, and should have done, in this day of Google was search prior to posting previously. Having just done a google search for images I can see what's up with the Hoffman arc. If I'm looking at correctly labelled images of the Hoffman then it would seem very similar to the Ken Willis system.
Let's assume for a moment that a printed arc protractor (Hoffman or Willis) uses the exact same geometry for a given arm. I can see a few sources of error with a printed arc:
-the ability of the user to cut the spindle hole to the exact size of the spindle
-the ability of the user to centre the the spindle hole
-the ability of the printer to print to the exact scale required
-the ability of the user to measure and resolve the scale with a measuring tape
-the ability of the printer to print fine
-the ability of the user to resolve the needle to be centred on the arc
-the ability of the user to resolve the cantilever to be aligned with the groove at the nulls.These errors CAN be minimal, but all need to be minimized as close to nil as possible in order to keep the overall error at nil.
My experience with the Willis (and other printed protractors) and the Mint has led me to believe that the Mint takes care of most of these sources of error, leaving the only sources of error of the last two points above (which are made easier to resolve with the super-fine arc and the parallax lines).
Using the Willis arc I believed I was DEAD ON. The Mint and listening showed otherwise.
Edits: 05/17/14 05/17/14
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Follow Ups
- RE: I'm grateful - steven d 18:13:23 05/17/14 (1)
- RE: I'm grateful - markd51 18:50:14 05/17/14 (0)