https://www.posetteforever.com/viewtopic.php?f=64&t=3930&p=45099#p45099
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Nik
Friday, 26 January 2018, 11:12 AM

'Arch-ery' Re-visited !!
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After studying my 10', 20' & 30' arches, nothing made sense; why did I pick those arch-brick / Voussoir numbers ??

Baffled, suspecting I [i]may [/i]have miscounted a couple of whatsits, I looked at my many door-ways & windows.

22" inch doorway, 11 whatsits, so cut from a 22-'ogon.
26" inch doorway, 13 whatsits, so cut from a 26-'ogon.
38" inch doorway, 19 whatsits, so cut from a 38-'ogon...

Gotcha.

The 10', 20' and 30' arches were the first I'd made, 'sized by eye'. Doorways were 'second generation', from when I knew better.

Another 'gotcha' is that eg 10' arch = 120" inches would need 60 whatsits, cut from a 120-'ogon. No key-stone. But a 118" arch would need 59 whatsits, [b]including [/b]a key-stone, at the cost of an inch either side. 
That's a win !!

Now I just have to make them with the still-unfamiliar ACIS tool-set. First, though, I've to retrieve the screen-layout template from old TC, hide some of the zillion tool-bars that clutter TC16_Pro's default views...


Um, I've decided 10" ( 10.x") inch riser spiral steps are too steep. I'll switch to 5" (5.y") risers, with a landing half-way. This also allows mezzanine access if required...

Waiting for postie, then off for some groceries. Dental check-up this afternoon...


