Accurate angle on a scraped prism

[not done it yetParticipant @notdoneityet]

Our esteemed 'A' level maths tutor seems not realise that 'x' in my example was the error between assumed intersection and actual intersection on the x axis.

Simply, two equations with two unknowns is easily solved with simultaneous equations. As I wrote previously, the error margin may be in excess of the accuracy, or precision, of his practical measurements. But the principle is barely in excess of GCSE level, so can be assessed for worth, dependent on measuring skills.

[SteveIParticipant @stevei]

Posted by Iain Downs on 31/10/2016 22:24:40:

What I'm not clear about is how one then gets the dovetail angle accurate. I appreciate that you scrape a dovetail against a straight edge and the use that to blue up the mating dovetail, but surely one wants the angle to be as close to a target dovetail as possible.

Iain,

The absolute angle does not matter. You are scraping for fit so that you have a match between the 2 parts. Best practice is to work with whatever the angle is and remove the minimum amount of material.

Steve

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