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Problems Constructing A Helix
Sherri is planning a helix and has a question for readers relating to online helix calculators and uses the example of the free helix calculator at http://www.modelbuildings.org/free-calculator-tools.html to explain her problem:
“On the Helix Calculator “Item D” you can choose a ring width as small as 1″. This number is used to reflect how many sheets or fraction of sheets of plywood you will need as shown in “Item M”.
In “Item F” the formula adds 4″ to whatever radius size you choose in “Item A”. Therefore, I believe the minimum ring width would be 2″ plus one half the width of the gauge track you are using. At that calculation the inside edge of the track would be right at the inside edge of the ring. If you center the track in the ring, then I believe the minimum width of the ring would have to be 4″ instead of the minimum 1″ as shown in “Item D”. Am I correct, or am I missing something?”
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I am assuming that the 1″ figure given here is for calculation setting purposes to allow for different scales.
Robert M