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Viktor Voroncov
04-06-2010, 12:53 PM
Hello,
We are finishing one project - vector tables and vacuum tables for lasers. If it will be interested - I will put information here next week.
One of ideas is put on both tables rulers on X and Y axis. As we do not have a lot of space at the table edges, WIDTH of ruler will be only 10 mm. We want put on one half of ruler millimeters, on another - inches. Maximum LENGTH is 1245 mm. May be somebody from SMC have CDR file with inch ruler of this width/length? I can create ruler by myself but I am not sure that I can properly mark it as I am not familiar with inch system at all. For example here in Europe we mark each 5th mm with slightly bigger line, and each 10th mm with even bigger line. Sure that similar rules is in inch system also but I don't know them.
Thank's in advance!

Lee DeRaud
04-06-2010, 2:56 PM
Traditional inch rulers have progressively smaller marks at binary divisions (1/2, 1/4, 1/8 etc), but there's nothing keeping you from doing them in tenths with a longer mark at the inches and half-inches. For people driving a laser with Corel or CAD software, that's probably more useful than a "normal" ruler anyway.

Personally, I'd resist the temptation to do divisions any smaller than 0.1": it just clutters the scale and if anyone needs more precise placement than that, they should probably be using some kind of jig anyway.

Viktor Voroncov
04-06-2010, 3:15 PM
Thank's, Lee. I have plastic ruler from old JDS catalog and looking on it I also have idea mark only 1", 1/2, 1/4 and 1/8 and do not mark smaller units. But was not sure is it OK :)

Frank Corker
04-06-2010, 4:44 PM
Here you go Viktor, this should help you, well I hope it will it is all to scale!

Michael Hunter
04-06-2010, 5:51 PM
So which is it to be - tenths or fractions of inches?
My Granddad (a toolmaker) had an American steel ruler that went down to 1/64ths of an inch : he had to guess the 1/128ths!.

Mike Null
04-06-2010, 10:20 PM
Victor

I would use 1/16's as the smallest division.

Viktor Voroncov
04-07-2010, 1:22 AM
Thank's, Frank for file and all others for advices. I will do rulers and put picture here. One question more: is it right name inch system with word IMPERIAL? mm = metric, but inches = ?

Mike Null
04-07-2010, 6:24 AM
Victor

I believe it is called the English system of weights and measures.

Frank Corker
04-07-2010, 7:08 AM
It is called IMPERIAL WEIGHTS and MEASURES system - but it's been quite some time since I bought a rod of timber lol

1 nail = 2 inches 4 inches = 1 hand 12 inches = 1 foot 3 foot = 1 yard 5.5 yards = 1 rod 6 foot = 1 fathom 22 yards = 1 chain 100 links = 1 chain 10 chains = 1 furlong 8 furlongs = 1 statute mile 6080 foot = 1 nautical mile

David Fairfield
04-07-2010, 8:28 AM
I remember struggling to learn the Imperial system in elementary school (we called it the English system if I recall). 4 pints to a quart, 4 quarts to a gallon etc. Needlessly complicated. Medieval in fact.

Mike Null
04-07-2010, 9:00 AM
Here is further clarification/confusion.

http://en.wikipedia.org/wiki/United_States_customary_units

Scott Shepherd
04-07-2010, 9:16 AM
Also a rule posted here too :

http://www.sawmillcreek.org/showthread.php?t=73213

Dan Hintz
04-07-2010, 11:02 AM
Victor

I would use 1/16's as the smallest division.
I second this. Positioning something by eye can be easily done down to 1/32nd of an inch if 1/16" marks are there, 1/64" if you have a good eyeball and decent coordination. If you need better resolution than that, a ruler marked with finer gradations isn't much help over such a large table (that you're leaning over anyway). Leaving it at 1/8" marks is too large, in my opinion...

Viktor Voroncov
04-07-2010, 2:47 PM
After some print tests we decide keep 1/16 as smallest division. The ruler will be on laser table so will not necessary/not possible look on ruler from short distance. Ruler will be like "fashion" but not main advantage of final product and will be used for +/- positioning of material on table.

Niklas Bjornestal
04-08-2010, 2:21 AM
It is called IMPERIAL WEIGHTS and MEASURES system - but it's been quite some time since I bought a rod of timber lol

1 nail = 2 inches 4 inches = 1 hand 12 inches = 1 foot 3 foot = 1 yard 5.5 yards = 1 rod 6 foot = 1 fathom 22 yards = 1 chain 100 links = 1 chain 10 chains = 1 furlong 8 furlongs = 1 statute mile 6080 foot = 1 nautical mile
You ppl should change to the metric system :D
Much better and simpler:
1 km = 1000 m
1 m = 100 cm
1 cm = 10 mm

Michael Hunter
04-08-2010, 4:55 AM
But the metric system is really really boring!

Buy in rods and pay in guineas is what I say.

(1 guinea = 21 shillings = GBP1.05)

Dan Hintz
04-08-2010, 10:53 AM
Would if we could... us 'mericans, we're a stubborn bunch ;)