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  1. #1
    Join Date
    Mar 2008
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    Default How to test a 22.5 degree bevel cut

    I am in the process of cutting a box with a 45 degree corner, comprising 2 x 22.5 degree cuts. Can anyone please suggest a way of measuring this cut angle to see if it is exactly 22.5 degrees?

    I am familiar with the testing of a 45 degree cut for mitres, joining them and using a set square, or doing 4 pieces with 45 degree ends and then setting them end to end in a square, looking at how well the final joint mates.
    regards,

    Dengy

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  3. #2
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    Feb 2007
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    Default

    If there is a good quick way I would like to know also. Only things I can think of is join 2 bits to get 45 and check with the 45 on your combination square or 4 bits will be 90 checked with a square.
    I guess you dont want to use the good box timber finding out so perhaps test cut the angles in some old pine to see if the box angles work.
    Regards
    John

  4. #3
    Join Date
    Jul 2005
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    Oberon, NSW
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    Default

    Quote Originally Posted by Dengue View Post
    I am in the process of cutting a box with a 45 degree corner, comprising 2 x 22.5 degree cuts. Can anyone please suggest a way of measuring this cut angle to see if it is exactly 22.5 degrees?

    I am familiar with the testing of a 45 degree cut for mitres, joining them and using a set square, or doing 4 pieces with 45 degree ends and then setting them end to end in a square, looking at how well the final joint mates.
    Same thing. Cut 4, put 'em together and check that they come to 90º with a square.

    Or join 2, grab a sheet of A4 paper and carefully fold one corner of the paper to make a 45º angle you can use to check.

    Either way will be "not quite" as accurate as checking 2x 45ºs, but should be well within any discernible margin of error if you take the time and care.
    I may be weird, but I'm saving up to become eccentric.

    - Andy Mc

  5. #4
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    Mar 2008
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    Default Success!

    Thanks everyone, followed your advice and gave it a go by cutting only 3 pieces of 18 x 42 on edge, then sitting them flat on the inside of a carpenters square laid flat on the table saw. Easy to see any misalignment. The wider the piece cut on edge, ( in my case 42mm), the more accurate the test.

    yep, only needed 3 pieces to give 90 degrees
    regards,

    Dengy

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