Mitre curve.
 

I have to replace the moulding on a door. The door has two quarter
lites at the top, and these lites are curved. I am curious how to
calculate the angle that the mitre would need to be.

Any ideas? Is there a rule of thumb?

Mitre curve.
 

"Pat" wrote in message
oups.com...
I have to replace the moulding on a door. The door has two quarter
lites at the top, and these lites are curved. I am curious how to
calculate the angle that the mitre would need to be.

Any ideas? Is there a rule of thumb?


I am thinking it would still be a 45 degree miter where the curve meets the
straight if the 1/4 lites are 1/4 circles. On a 1/4 circle the arc
intersects the vertical or horizontal at a right angle.

Mitre curve.
 

I tried that. It did not work.

Mitre curve.
 

Angle finder.

Dave

"Pat" wrote in message
oups.com...
I have to replace the moulding on a door. The door has two quarter
lites at the top, and these lites are curved. I am curious how to
calculate the angle that the mitre would need to be.

Any ideas? Is there a rule of thumb?




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Mitre curve.
 

Pat
When a curve meets a straight it is usually never a 45 degree
If there is a formula I never heard of one

Do a simple full scale layout and then use and adustable triangle
to get the angles

Good Luck,
George

"Pat" wrote in message
oups.com...
I have to replace the moulding on a door. The door has two quarter
lites at the top, and these lites are curved. I am curious how to
calculate the angle that the mitre would need to be.

Any ideas? Is there a rule of thumb?

Mitre curve.
 

I will assume that you have taken the joints in question apart. Use a
miter gauge to measure the angle on the vertical stile with a try
square clamped on the joint. You want the complementary angle [the
actual angle of the new piece].
Use the miter gauge to set up your saw for the cuts.
Try a piece of scrap & check the right angle before committing to the
real operation.
Bugs

Mitre curve.
 

"Pat" wrote in message
oups.com...
I tried that. It did not work.


Ok then use a protractor to measure the complete angle of both sides where
they meet. Cut your miter at 1/2 of that angle for both pieces for the
miter to have a uniform fit at the union. Keep in mind however that you
must hold the curved piece at the exact angle in relationship to the other
piece when cutting.

Mitre curve.
 

Pat wrote:
I have to replace the moulding on a door. The door has two quarter
lites at the top, and these lites are curved. I am curious how to
calculate the angle that the mitre would need to be.

Any ideas? Is there a rule of thumb?

Think of a curve as being a large number of very short straight lines...


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....a help file of info about MP3s, recording from
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Mitre curve.
 

On 18 Dec 2005 17:45:47 -0800, "Pat" wrote:

I have to replace the moulding on a door. The door has two quarter
lites at the top, and these lites are curved. I am curious how to
calculate the angle that the mitre would need to be.

Any ideas? Is there a rule of thumb?

If you have the old trim pieces you can use them to find the angle.

If you have new trim pieces and don't have the old ones you can hold
the pieces on the door where they will be installed and make light
pencil marks to find your angle.
Hold one of the curved pieces up (where it will be installed) and put
a light mark on the wall and jamb along the top and bottom edge of the
piece approximately where the intersection will be. Then hold the
straight piece (where it will be installed) letting it overlap your
marks from the curved piece. Again, make a mark on both sides of the
straight piece where it intersects your first set of lines. The
intersections of your two lines will be the long and short points of
your angle. Hold your pieces up again and transfer your marks (at the
intersection) to your piece(s). Take the piece to your table saw or
miter saw and find your angle buy using the marks.
This will work for finding angles where curved pieces run into
straight pieces or where two pieces of different witdths need to
intersect.

Mike O.

Mitre curve.
 

On 18 Dec 2005 17:45:47 -0800, with neither quill nor qualm, "Pat"
quickly quoth:

I have to replace the moulding on a door. The door has two quarter
lites at the top, and these lites are curved. I am curious how to
calculate the angle that the mitre would need to be.

If you don't know the curvature OR the angles, how are you going to
make moulding, Pat?!? Got a picture of it on your website?
Are they domed, gothic, circular, or what? Symmetrical or asym?


Any ideas? Is there a rule of thumb?

Yes, the window's total angles have to add up to 360°
(or 180°, depending upon the formula used.) bseg

Perhaps a trip to your local bookstore or library might help.
Look for "Circular Work in Carpentry and Joinery" by George Collings.

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Mitre curve.
 

Thanks for the book link. No chance of finding it in my book store.

The "windows" are symmetrical. The radius is 12 7/8. The "windows" make
up a the top half of the circle. Using a protractor I figure the top
angle is 74 degrees and the bottom angle is 85 degrees. I managed to
get the wood bent (steamed) and cut but it is not a nice tight job. I
would have liked to have done it better.

Thanks for the advice.

Mitre curve.
 

On 20 Dec 2005 22:01:00 -0800, with neither quill nor qualm, "Pat"
quickly quoth:

Thanks for the book link. No chance of finding it in my book store.

The "windows" are symmetrical. The radius is 12 7/8. The "windows" make
up a the top half of the circle. Using a protractor I figure the top
angle is 74 degrees and the bottom angle is 85 degrees. I managed to
get the wood bent (steamed) and cut but it is not a nice tight job. I
would have liked to have done it better.

Take some 120 grit sandpaper, fold it in half, and hold the mating
pieces together to form the joint. A few strokes should mate them
better than they were and tighten up the miter.


Thanks for the advice.

Jewelcome.


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