Background discussion of TT`s Pyramid

[neptune]

@ Duff . Thanks for the above diagram .Unfortunately it still leaves room for doubt . Look at the diagonal line that joins the apex to the baseboard . This represents a square tube . So does it represent the upper surface of the tube , or the lower surface . Judging from the point where the round tube is to be cut , I would say it represents the upper surface . OK so now we have another problem .We know the baseboard is 1` metre square . Therefore the square base frame made of four square tubes must be LESS THAN one metre square , especially if the plasterboards are , as stated , equilateral triangles . My personal guess is that they are not . In other words , the base frame is one metre square , The square tubes that form the diagonals are 1 metre less 20mm , [Thomas talks about "giving away" 20mm here ] and the panels are not true equilateral triangle . Note that back in 2007 , he did not actually measure the panels . He made the frame first , and drew round it onto the plasterboard .  .
Edit . The diagram is correct and makes sense ONLY if that diagonal line is the LOWER surface of the square tube diagonal member . and the red tube is cut a bit higher up than shown . Your comments please .

[FatBird]

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[duff]

@ Duff . Thanks for the above diagram .Unfortunately it still leaves room for doubt . Look at the diagonal line that joins the apex to the baseboard . This represents a square tube . So does it represent the upper surface of the tube , or the lower surface . Judging from the point where the round tube is to be cut , I would say it represents the upper surface .

Yes, I agree.

OK so now we have another problem . We know the baseboard is 1` metre square . Therefore the square base frame made of four square tubes must be LESS THAN one metre square , especially if the plasterboards are , as stated , equilateral triangles . My personal guess is that they are not . In other words , the base frame is one metre square , The square tubes that form the diagonals are 1 metre less 20mm , [Thomas talks about "giving away" 20mm here ] and the panels are not true equilateral triangle . Note that back in 2007 , he did not actually measure the panels . He made the frame first , and drew round it onto the plasterboard .  .
Edit . The diagram is correct and makes sense ONLY if that diagonal line is the LOWER surface of the square tube diagonal member . and the red tube is cut a bit higher up than shown . Your comments please .

The square base is made of two 20mm x 20mm x 1000mm tubes PLUS two 20mm x 20mm x 980mm tubes.

The measurements form the apex (center of vertical pipe) to the bottom outside corner of the square base is 1000mm.

It is, at times, difficult following what Thomas is saying and I struggled with these dimensions and measurement points for a long time, just following the "Language" Thomas used.

Finally I had to let the above drawing have the final word. But if you remember there was even questions as to whether Thomas examined the drawing close enough.

Well, the above is just my opinion. I guess we will see as we go along...

[neptune]

Hi Duff and thanks for your comments . Just to affirm what I am saying . Look at the diagonal line . Notice that.it "passes through" the metal of the base frame .In my opinion it can only represent the lower surface of the diagonal frame member . On TTs video he says that it does not matter if the frame is not correct to the millimetre . We can only build as we think best in the end . To me , it seems a shame that Thomas seems to want others to help with his research , and yet he can not spare two minutes with a tape measure to verify his dimensions .

[duff]

Hi Duff and thanks for your comments . Just to affirm what I am saying . Look at the diagonal line . Notice that.it "passes through" the metal of the base frame .In my opinion it can only represent the lower surface of the diagonal frame member . On TTs video he says that it does not matter if the frame is not correct to the millimetre . We can only build as we think best in the end . To me , it seems a shame that Thomas seems to want others to help with his research , and yet he can not spare two minutes with a tape measure to verify his dimensions .

Yes Neptune - I agree.

That's one reason I drew this in Google Sketchup, so I could actually come up with the length of the diagonal and angle while maintaining the 1000 mm from bottom corner to apex.

It is very frustrating trying to get verification on something so simple.