Trammel Point Tool

One of these days I have to invest in a trammel point tool and today was today. Sometimes you need to draw an arc such as today where I needed a 8.1 inch radius arc. You can make an impromptu tool with a strip of styrene and two sharp pencils but the tool is so much quicker.

anyway:

[url]https://i.imgur.com/rwNd7eY.jpg[/url]


I need two truncated cones of the bottom of my turrets and the mouth wash cups are ideal for a 3D template to manufacture these.

[url]https://i.imgur.com/kyWN68d.jpg[/url]


I'm using 0.020 (thousands) inch styrene so its a bit stiff to form into a cone shape so its best to draw the arc segment over the sharp edge of a table applying pressure with your palm to impart a curve to the arc sheet.

[url]https://i.imgur.com/6f1nBOy.jpg[/url]


Alternately you can wrap the arced pieces tightly and leave for a while secured wit rubber bands to impart an curve.