I did not examine Task Manager to see what the computer was trying to do, but other than Alibre the only programme open was the browser, including this Forum!
I don't think Alibre did re-install itself if the number following the title is a guide. the Desk-top symbol is labelled,
" Alibre Atom 3D 26.0.0.26040".
If the first two digits are the version, it hasn't. It was trying to load V27.
Anyway it appears to have survived its antics.
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So I set out to draw my wagon's new cylinder block. I am not sure how much of Alibre Atom I've forgotten as I'd not touched the programme for at least six weeks; but I remembered I cannot grasp how to Assemble anything from two or more Parts if they are not already facing the right way and stay that way.
This 3D model is a single Part though.
All went well until one of the cylinder-cover stud holes fell off the edge.
Measuring the actual part-made block on the table next to the computer, I found I'd miscalculated the dimensions. So had to trim one end and stick some "metal" on the other, necessitating re-drawing the ports at that end.
It looks a bit of a mess, as the added bit, as an outwards extrusion, is not a true extension but turned out as a "glued-on" slice and slightly out-of-line. I'd also tried too hard with that mirror tool so created problems without saving time. The "long" way round where the experts would go the quick way, is the simpler and better one when you are not an expert.
I'll have to redraw this Alibre model from fresh if I want to produce working drawings from it. For I need make the block afresh as I'd "designed" all sort of strange traps in it, leading years later to it being too complicated with extra and too-narrow sealing-surfaces, stud-holes entering the passages, and the like.
Meanwhile, how large a block of cast-iron stock bar can College Supplies, supply?
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As for Alibre, it did not feel up to re-installing itself!