To make things easier, we set the origin to the Center:
(this can be changed later)
First, a 3" circle:
We estimate 1/4" thickness, so another circle inside:
and it looks as if the inner lip/body is 1/8" thicker than that, so we create another circle which has a radius 1/8" less than the middle one:
We need a series of lines to set the upper geometry, so we draw one in:
Done
and use the Circular Array tool to make a suitable number of duplicate appropriately spaced:
First thing to do is to adjust the center by clicking “Select Center in Window”, then clicking at the center:
Since half of the circle stays intact, we work with a 180 degree arc:
and then we increase the number of lines until we have lines which seem to be placed where the features should be:
OK
We then deselect the lines which will be wanted by shift-clicking on them:
leaving selected the elements which we wish to delete:
Select the two outer circles:
copy-paste them in place by moving the cursor out of the drawing area:
then add the lines to the selection:
and use the Trim Vectors tool:
to allow you to click on what is not wanted:
until one arrives at:
OK
OK
Join Vectors:
Yes
For previewing’s sake we draw in geometry surrounding everything:
(with dogbones so that the corners won’t be left behind)
Then add the elements for the highest portion of the part to the selection by shift-clicking on them:
We then go to Toolpaths and make a Pocket toolpath with this selection to the desired depth:
Then we select the two outer circles and the other geometry:
and assign a toolpath which starts at the bottom of the previous one and cuts down as deeply as is desired:
Lastly, we select the inner and outer circles and the outer geometry:
and make a toolpath to remove the balance of the material:
which previews as:
Attached as a v7 file.
plastic_valve_body_v7.c2d (116 KB)