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Rules or Scales in guitar building - question

Posted: Sun Nov 03, 2013 5:30 pm
by Bob Moore
What type of rules or scales do you prefer for guitar building? How exact do they need to be? Do you use mm's, decimal inches, fractional inches, what combinations? What increments are needed - 64th", .1mm? How long are they?
I'm going to start building #5 in the next month or so, and thought I'd get some rules or scales (some refer to the very accurate ones as "machinist scales" - but I don't want to bog down in names if it can be avoided) buying one every couple of weeks or so.
My thoughts are to have one that is 6", 2 ft, and 3 ft. As I might start making some classical guitars, it might be good to have Inch/Millimeter on one or more of them.
So what to buy? Fractional + decimal inches? Fractional + metric? Decimal + metric? Is there one with all? (Too much? probably)
Is it more important to use the same measuring scale - is it enough to use the same one if you do it the same way all the time?
I'd appreciate insight on what you choose and what makes you choose a particular type or brand.
Thanks in advance.
By the way, what brought this on is that my eyesight has been changing over the past several years, and I couldn't see accurately enough anyway, and although I tried to be very precise, often it was hard to see enough detail for precision. I had cataract surgery this past Mon, and will have the other eye done tomorrow. Gosh what a difference. I won't be going overboard on this, so if there's such a thing as too much precision, I won't go there. Oh, I do recommend the surgery if you have cataracts. It's very, very safe and the whole world looks way better to me than it did a week ago.
Bob

Re: Rules or Scales in guitar building - question

Posted: Sun Nov 03, 2013 7:40 pm
by ken cierp
I use digital calipers (.000) and a 24" engineering scale decimals on one edge metric (mm) on the other.

Re: Rules or Scales in guitar building - question

Posted: Sun Nov 03, 2013 10:11 pm
by Lonnie B
Bob I also have a digital caliper. Metric and inches. My eyesight is somewhat questionable I have an appt with my eye dr this Friday. Every time I go he increases my prescription strength so I expect him to do it again. Good luck to you