Bookmark Accounts
Home Articles Forums Gallery Marketplace Videos
Compare cordless drills on the numbers that matter

WoodCentral Forums

Knowledge You Can Build On — Est. 1998

Find sources of lumber, veneer, wood specialties and sawmill services - see how it works

ogee

Posts

ogee

#1

ogee

John Lucas

>Well I tried but could not remember the formula for creating ogee using the golden rectangle. I know it used triangles made from the rectangle like Keith showed us but I can't remember how you find the center points for the circles. Maybe someone else will remember. I've drawn one to give you the idea but I did it in reverse. I drew the ogee and then the circles. As I remember it was done by creating the triangle, then drawing different golden rectangles to establish center points for the circles. You can turn the triangle sideways to get tall vessels. I just couldn't figure out the formula's tonight. Of course I've only had 4 hours of sleep. maybe it will come to me tomorrow.


img

Re: ogee

#2

Re: ogee

William Duffield, on the Cohansey

>Here's how I construct an ogee curve, with ruler, straightedge and compass:

- Draw a straight line between the end points of the ogee.

- Measure the length of the line, and use a calculator to find the inflection point where the curve changes direction. There is also a geometrical way to divide the line at the golden mean, but the calculator is quicker.

- At each end point draw a tangent to the desired curve. This determines the directions the curve will be going at the end.

- At each end, draw a perpendicular to the tangent line.

- At the inflection point, draw a perpendicular to the original line, in both directions. This perpendicular will intersect both of the perpendiculars drawn at the ends of the curve.

- Using a compass, draw arcs from each of these intersection points, between the end points and the inflection point.

Note that this method creates a Roman ogee, not a Greecian ogee. The more ancient Greecian ogee would require much more difficult to construct eliptical curves, instead of circular curves.

If anyone needs a drawing, let me know, and I'll try to construct and post one.

Re: ogee

#3

Re: ogee

John Lucas

>William

I think you and I both have demonstrated what Keith is talking about. Making it simple enough to not turn people off. When I read your statement,and mine, it gets very confusing with all the terms like tangent, perpindicular, golden mean etc, many people get turned off immediately. I think what Keith is trying to do is to make design issues simple enough for everyone to want to give it a try.

I would appreciate of drawing of what you have stated but will try to set it up when I get home tonight even if you don't post it. Thanks for the info.

Re: ogee

#4

Keith Tompkins

Re: ogee

Keith Tompkins

>Thanks for posting this John, I CAN post some complex items if you would like....seriously, it is amazing what one can draw with just a compass......how about a perfect spiral? He He

Re: ogee

#5

Re: ogee *LINK*

John K Jordan

>>it is amazing what one can draw with just a

>compass......how about a perfect spiral?

You can only approximate a spiral with a compass and straight edge.

The link below describes some basic geometric constructions using a compass.

JKJ in East TN


GEOMETRIC CONSTRUCTIONS

Re: ogee

#6

Neat site

Tony - Memphis

>Thanks for the link. I do most all of my layout in CAD, but there is always something I need to do by hand in the shop. Plus, I like to try to keep sharp.

Tony

× Share

Share on

X / Twitter Facebook LinkedIn
✉ Email this page