| Gallery, Projects and General > How do I?? |
| Checking a 45 degree square? |
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| Bluechip:
--- Quote from: Fergus OMore on May 27, 2015, 02:51:27 AM --- isosceles triangle which cannot have equal sides and 90 degrees somewhere. Back to the coffee Norman --- End quote --- ??? Surely a 45o set square is just that ...... two equal sides, ditto 45o angles and 90o at the apexy end ?? Enjoy your coffee, I'm back to fence painting ... :bang: Dave |
| mexican jon:
--- Quote from: Bluechip on May 27, 2015, 03:52:57 AM --- --- Quote from: Fergus OMore on May 27, 2015, 02:51:27 AM --- isosceles triangle which cannot have equal sides and 90 degrees somewhere. Back to the coffee Norman --- End quote --- ??? Surely a 45o set square is just that ...... two equal sides, ditto 45o angles and 90o at the apexy end ?? Enjoy your coffee, I'm back to fence painting ... :bang: Dave --- End quote --- What is needed here is a Isosceles Triangle :scratch: 2 equal sides and 2 equal angles :clap: and in this case 2 45 degrees and a 90 :clap: |
| Fergus OMore:
Yes Dave- the coffee is not strong enough! Thank you. I can't deduct 2 x 45=90 from 180 degrees. I hope that I have not caused 'a fence' said he 'hedging' away. Lawn and ordure, that's me! I ought to go back as a manure student :loco: :hammer: :bow: arriba, arriba Wor Norm |
| awemawson:
Can one not precisely check or set angles by turning (and / or grinding) precisely sized disks and abutting them? Three such disks firmly in contact with each other can have straight edges tangentially touching two disks and forming an easily calculated precise angle between them? |
| PekkaNF:
--- Quote from: S. Heslop on May 27, 2015, 12:26:21 AM ---If it's triangular shaped couldn't you measure the lengths of the sides, and just make sure they match and the angle between them is 90 degrees? --- End quote --- There are some practical considerations on how sharp you can make the edges....therefore this is not very accurate. --- Quote from: awemawson on May 27, 2015, 05:38:09 AM ---Can one not precisely check or set angles by turning (and / or grinding) precisely sized disks and abutting them? Three such disks firmly in contact with each other can have straight edges tangentially touching two disks and forming an easily calculated precise angle between them? --- End quote --- Yesh, this is old "book" method and used to check squares etc. I would take some roller bearing parts or ball bearings or such. Surely there are three of them proper sized lurking somewhere? But you need a good square or four identical bearing rings to check the square first :wave: Pekka |
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