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01-07-2010 #1
Last Activity: 02-02-2020
Cheers ... Just what the doc ordered!!
Tim G-C
“I disapprove of what you say, but I will defend to the death your right to say it.”
(attrib. Voltaire but written by Evelyn Beatrice Hall "The Friends of Voltaire" 1906)
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01-07-2010 #2
Last Activity: 4 Days Ago
Nice one Ross, looks good to me. I fed those numbers into my Gantry Spreadsheet (using tube profile with OD 16 and ID 0, length 900mm and load 250N) and got the same values for second moment of area and vertical deflection.
Out of interest, I've posted my sheet. It compares different sections and how they deflect due to vertical load and tool cutting applied torsion. Obviously, this spreadsheet only considers the gantry part of the machine.
Purple boxes are inputs, yellow boxes are outputs. There are graph tabs to visually compare sections.
Might help other people with the design process, although usual disclaimers apply...
EDIT: Updated to version 4, with much clearer layout and data entry. Also added different end conditions (from Ross's sheet).Last edited by routercnc; 06-07-2010 at 09:23 PM. Reason: updated attachment . . .
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