- 7 Aug 2003
- Reaction score
Anybody help me on this one? Danny Proulx uses one but I can't really get on with it and I can't find any other ones.
In essence yes, the arc and chord etc. Various sizes of cathedral doors to make so need something so that they they all blend in. They have to match various sizes of existing doors. I may be able to borrow a door if I need to.deserter":1okw3o64 said:Is it the radius of the part circle your trying to work out?
~Nil carborundum illegitemi~
Thankyou Bob, good on yer.9fingers":1ztwyiuw said:Noel,
Assuming the curved edge is part of a circle (it need not be - could be an ellipse or an arbitrary oval)
If you have the length of the chord 2L and the distance D between the chord and the circumference of the circle, then the radius of the circle is given by:-
R=(L^2 +D^2) /2D
That's something I hadn't considered Chas and it seems obvious. As long as all the different doors look in proportion I'd be happy. I do have a tendency to over complicate matters.CHJ":2m7grtym said:Noel, if you need to match the form of existing doors with the uncertainty of how the curves were constructed, would it not be better to scribe a pattern from an existing door or it's frame and use that to scale up or down by fixed amounts , rather than bothering with calculations that may or may not be the same as used for the original.