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Working with splines
The PDF below gives one method of working with the spline tool.
I’m not gonna say it’s the best method or the only way one should work with splines. But, it has come in handy from time to time
To use this method in Onshape, you will have to connect a number of splines, And wherever you want a smooth curve, you’ll have to make that connection tangent — Indicated by the teeter totter type of handle — see the GIF
I learned this method at a class I took in junior college around 1995. The instructor was accredited by Adobe for teaching Illustrator and Photoshop
One thing about this method is that it’s quite good for tracing over scanned images
And it can produce some very fluid and smooth — maybe even elegant French curve type of line art
But as with a lot of artsy type of things, it will boil down to the operators ability in the long run
Anyway, I hope it helps maybe at least some people
The PDF is a truncated version of some posts I made in another forum 8 years ago, under the handle How_goes_it. So by wild chance, if somebody recognizes this, well I’m not plagiarizing it. I’m the one that wrote those posts back then
There is a PDF directly below that you could download