CLOCK.

I have been busy. A few weeks ago the machine had a major fit and though it is back to better than normal now I seem to have lost half of MS Office. The only bits I use are Word and Xcell or whatever the spread sheet bit is called. I only use the latter infrequently as a posh calculator if I have the same job to run with differing input values. Usually it's more trouble to set up than it is to use a calculator. I have uninstalled MS Office installed LibreOffice, had a quick look, it seems fine, probably of more use to me as it has a dedicated mathematics page.
I have made or modelled my first proper gear with no overlapping faces, like a dog with two tails I am.

This mesh is awful but it is clean and clear of double vertices. I must apologise to Mark for the derogatory observation I made when confronted with his peat wagon mesh. This is far worse but it is an accurate spur gear. It isn't going to get any better as I can see me having to loop cut the teeth to get it to animate in Rigid Body Physics. Blender 2.80 is accepting Functions now so with a lot of help from OTVINTA I have got this far.
I'm away for a walk as my head is about to explode. Only three more gears to go and I'll have the makings of a clock final drive.