And, now we have a scan:
As before, the file does not allow a direct 1:1 scaling, so we measure the grid at the current size by zooming in:
r
and drawing a square:
12:1 seems a reasonable scale to try for, so we draw an 0.25" square:
then scale it up by 12:
Done
and then adjust the image scaling to line up:
Again, we set the Job Setup to some dimensions to match:
Scale the grid:
and then do a final adjustment of things:
Again, draw circles:
and align:
and measure:
Duplicate by copy-pasting in place:
and add the measurement to the radius so as to offset:
For the bolt holes, again, group:
shift-click to add to the selection:
and Align Vectors:
OK
Ungroup
and add the measurement to the radius of a copy-pasted duplicate as an offset:
on each side:
For a different approach to get the tangents, since things overlap, select the 3 offset/overalapping circles:
and choose Boolean Union:
and check “Keep Original Vectors”:
OK
Choose Node Editing:
and select and delete nodes:
Until you get things shaped as desired:
Zooming in/out as need be:
If you go a bit too far:
just undo:
and iterate:
Note that only one side needs to be done:
Since one can copy-paste in place to get a duplicate:
Mirror Horizontal:
then select both:
and use the new Region Builder tool:
Yes
To select all of the regions which one wants:
(making sure that “Merge Connected Regions” is checked)
Or, use Boolean Union:
OK
Then use the nodes in the Unioned geometry as a guide:
Delete the unioned geometry:
Select the overlapping circles and the drawn polyline: n
and use Trim Vectors:
to remove what is not wanted:
OK
Select only the polyline:
and delete
w
as well as the small overlaps:
As before, use the Polyline tool:
to draw lines to connect the arcs:
Done
Select everything:
Join Vectors
Yes
Scale
Done
As a check, draw a grid square:
Select everything:
and scale:
Done
e
Select the grid square:
and if desired, adjust scaling further.
Adjust Job Setup:
delete the square
Select everything:
Group
and Align Vectors to the Stock
Setting the grid to match the graph paper, things seem a good match:
Then, Ungroup Vectors:
and apply toolpaths:
Drill
Contour
Cutout
Adjusting as appropriate for material and workholding and so forth.
