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In Reply to: RE: I'm grateful posted by amioutaline? on May 17, 2014 at 14:47:12
I'm not familiar with the Hoffman. What is it's construction?
Opinions don't affect facts. But facts should affect opinions, and do, if you're rational..
- Ricky Gervais, 2012
Edits: 05/17/14Follow Ups:
Just an Arc Protractor you can customize and print out. I mounted mine on Foamboard. There are a lot of posts attesting to it's accuracy as checked against the Mint and Feickert.
One ambitious Filbert even printed his on a transparency, then affixed it to a mirror. Not sure about drilling a hole in a mirror with any accuracy so it might be BS.
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.
Opinions don't affect facts. But facts should affect opinions, and do, if you're rational..
- Ricky Gervais, 2012
Edits: 05/17/14 05/17/14
When I got my MintLP Tractor some 2 or so years back, I spent a good 1 hour 45 minutes aligning my ZYX Airy 3X Cartridge. This tractor couldn't be any more precise.
Yes, patience, and a good mood with no alcoholic beverages is required to say the least.
I utilized my Littlite Gooseneck Lamp to good effect, plus a plethora of two Magnifying Glasses, and three Loupes, Yip's, and two others to help aid myself.
Was the cost worth it? Yep, it was IMO.
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