Mistakes in Van Rennes article

[John OlsenParticipant @johnolsen79199]

Well, I just had a play this afternoon with the Van Rennes article to see what I could make of it. I can confirm the uncertainty about the location of the mounting hole, the article says one thing, the drawing says the other. Also the hole size in the plinth which is given in the text as 8mm, when to be consistent with the base platform it should be 10mm.  One thing that was not totally clear at first was that one side of the lower column does not get the decorative groove, and although it is a reasonable assumption, we are not told that this is done with a ball ended mill. At least, that is what I would use.

 

But these are not show stoppers.

 

I did my check drawings in metric since this seems to be the native format. The dual dimensioning is a difficult thing to do without causing a bit of confusion…my own preference would be to choose one or the other, but then I am sufficiently bilingual to be happy either way.  I went with the offset position for the column since it seems that the rest of the engine will be in front so that made more sense. Easy to change it later if I am wrong.

 

One thing to bear in mind is that this article has been done more in the style that LBSC used to use, in that much of the information is in the text rather than being detailed in the drawings. (“take a piece of 3/8 hex, chuck it in the 3 jaw and turn a quarter of an inch down to 5/16 inch bare…. ” You remember the sort of thing perhaps? At least if you are of a certain age. ) Anyway, that is one way to work, and no doubt it will suit some. My main comment on that would be that a few more photographs could help. So here is a near equivalent of a photograph of the column withoutthe rest of the engine obscuring it.

regards

John

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