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In Reply to: Can someone tell me what is wrong with Abe's protractor posted by artemus on October 12, 2009 at 18:16:17:
...that use the same alignment calculcations and see if they all agree with your setup - TB, the one included with the Hi-Fi News LP, a printed one, etc. They probably won't all agree, simply because there is too much error in the setup *process* (there is nothing wrong with the protractors themselves). It's the process that induces too much error.
Now print an arc protractor from Conrad's tool (with a very accurate Pivot-to-Spindle measurement), and go to work. I bet when you're done, all the universal protractors will agree, and then you'll offer to give them away (just as I am with my TB protractor).
There is no magic in the tools themselves. You can crank out an arc protractor in MS Visio in about 10 minutes (see above). It's all about the accuracy of a repeatable process. An arc protractor simply fixes a greater number of variables compared with a universal protractor.
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Follow Ups
- Grab 2 or 3 different universal protractors... - Nicholas Renter 06:01:26 10/13/09 (4)
- RE: Grab 2 or 3 different universal protractors... - artemus 06:54:51 10/13/09 (3)
- Make sure... - Nicholas Renter 10:40:28 10/13/09 (2)
- RE: Make sure... - John Elison 10:43:24 10/13/09 (1)
- Yes and no... - Nicholas Renter 11:44:28 10/13/09 (0)