rafterrat_2005 Posted September 19, 2014 Share #1 Posted September 19, 2014 I can't remember ware I saw it so am asking. What is the formula to go from fractions to mm. I'm working on the BLUENOSE by M.S. and they are using fraction, I am having trouble measuring the little fraction (38's x 64th). this is what I means and changed to mm (4mm x 27mm ). can some one please help me. They didn't teach millimeters when I was in school. Quote Link to comment Share on other sites More sharing options...
jburchfield1@wowway.com Posted September 19, 2014 Share #2 Posted September 19, 2014 (edited) Maybe this can help. http://www.advantagefabricatedmetals.com/conversionchart.html Another possiblity. Don't know where you live, but I bought a digital micrometer at Harbor Freight for $8.00 that reads out in fraction, decimal, and mm. Edited September 19, 2014 by Pops riverboat 1 Quote Previous build(mostly) - 18th Century Longboat Current build - Bounty Launch Next build - San Francisco by AL Future build - Red Dragon Future build - Mayflower from Model Expo Link to comment Share on other sites More sharing options...
jud Posted September 19, 2014 Share #3 Posted September 19, 2014 (edited) First do as your computer does, reduce fractions to decimal units, then convert. jud Edited September 19, 2014 by jud mtaylor 1 Quote Link to comment Share on other sites More sharing options...
CAd My Fingers Posted September 19, 2014 Share #4 Posted September 19, 2014 1. Divide fraction numerator by its denominator. 2. Multiply #1 result by 25.4 Example: 1/4" 1. 1 divided by 4 = 0.25 2. 0.25 x 25.4 = 6.35 mm Cheers, Jay WackoWolf, mtaylor and riverboat 3 Quote Current Build: Link to comment Share on other sites More sharing options...
mgdawson Posted September 20, 2014 Share #5 Posted September 20, 2014 Hi All Some people might be interested in an app for iPhone called ShopCalc which appears to be designed for carpenters, among other things it converts between fractional inches, decimal inches and metric for length, area & volume as well as basic calculator functions + - / x in whatever units you're working with or converting to. Perhaps someone familiar with Anroid can check if there's something similar available for that environment. Mark Quote Mark D Link to comment Share on other sites More sharing options...
Keith_W Posted September 20, 2014 Share #6 Posted September 20, 2014 Just go to google and type "1/32" into mm". That's it. Mike Y 1 Quote Regards, Keith 2007 (completed): HMS Bounty - Artesania Latina 2013 (completed): Viking Ship Drakkar - Amati 2014 (completed): HMS Bounty Launch - Model Shipways Current: HMS Royal William - Euromodel Link to comment Share on other sites More sharing options...
*Hans* Posted September 20, 2014 Share #7 Posted September 20, 2014 I wish the USA would join the rest of the world and go decimal. Nice wish, but if it will come true? Is Australia decimal? Quote Hans Owner of Kolderstok Models - 17th century Dutch ships. Please visit www.kolderstok.com for an overview of the model kits available Link to comment Share on other sites More sharing options...
Keith_W Posted September 20, 2014 Share #8 Posted September 20, 2014 Nice wish, but if it will come true? Is Australia decimal? Australia uses metric. AFAIK the only country in the world to use Imperial units is the USA and maybe some US territories and colonies - e.g. Liberia, Guam, Marshall Islands (but i'm not even sure about those). Quote Regards, Keith 2007 (completed): HMS Bounty - Artesania Latina 2013 (completed): Viking Ship Drakkar - Amati 2014 (completed): HMS Bounty Launch - Model Shipways Current: HMS Royal William - Euromodel Link to comment Share on other sites More sharing options...
jud Posted September 20, 2014 Share #9 Posted September 20, 2014 (edited) Being a surveyor I have used decimal feet for years and I use decimal feet when fabricating in the shop. I am forced to switch to decimal inches for small stuff because I haven't found any micrometers and such in decimal feet. Anyway decimals in a base 10 system work well and switching to metric which uses different names for decimal parts of a meter is the same. Besides needing two sets of wrenches to work on my pickup is a pain, think it was around 1975 when we were to switch to the metric system in this country, we were putting decimal feet as we always did after the days of chains and also meters on our plats without problem but we are a nation lacking in the ability to change to things that make sense and do well changing to things that don't. jud. Edited September 20, 2014 by jud riverboat 1 Quote Link to comment Share on other sites More sharing options...
jdbradford Posted September 20, 2014 Share #10 Posted September 20, 2014 Wait a minute, we are on the Dewey decimal system. Maybe you meant that we should go to metric? Jeff Quote Current Build: Model Shipways MS2015 - Fair American Kit bash Previous Build: J-Class Endeavor Link to comment Share on other sites More sharing options...
HIPEXEC Posted September 20, 2014 Share #11 Posted September 20, 2014 25.4 is the magic number Quote Rich Rich USS Constitution by hipexec (Finished build) Virginia Pilot Boat 1805 (gallery - first build) USS Syren (USS Argus) by Hipexec Joshua Slocum's Spray by HIPEXEC Link to comment Share on other sites More sharing options...
dgbot Posted September 20, 2014 Share #12 Posted September 20, 2014 At work I had to work standard, dec, and mm. It depends on who our customers were. David B Quote Work in progress USS Maine in cardstock.http://modelshipworld.com/index.php/topic/7446-uss-maine-by-dgbot-hmv-card/#entry220003 Completed Blockade runner Teazer http://modelshipworld.com/index.php/topic/6063-blockade-runner-teazer-by-dgbot-card-stock/#entry175967 Completed The Monitor Lehigh http://modelshipworld.com/index.php/topic/6920-the-monitor-lehigh-by-dgbot-card-model/#entry203680 Completed Kingston Class MCVD http://modelshipworld.com/index.php/forum/10-kit-build-logs-in-progress/ Link to comment Share on other sites More sharing options...
RichardG Posted September 20, 2014 Share #13 Posted September 20, 2014 My childhood in England was feet and inches. Then changing to metric as an adult. I then move to the US and am back to imperial. I find I work in fractional imperial and decimal metric - very confusing. I'm taking 1/4" x 1/16" strip and measuring a millimeter length. BTW, there is a scale calculator app available for Android called Scale Calc. Quote Richard Current Build: Early 19th Century US Revenue Cutter (Artesania Latina "Dallas" - messed about) Completed Build: Yakatabune - Japanese - Woody Joe mini Member: Nautical Research Guild & Midwest Model Shipwrights Link to comment Share on other sites More sharing options...
captainbob Posted September 20, 2014 Share #14 Posted September 20, 2014 (edited) To convert: Dimension in inches X 25.4 = mm Dimension in mm X .03937 = inches Bob Edited September 20, 2014 by Cap'n'Bob Quote Every build is a learning experience. Current build: SS_ Mariefred Completed builds: US Coast Guard Pequot Friendship-sloop, Schooner Lettie-G.-Howard, Spray, Grand-Banks-dory, a gaff rigged yawl, HOGA (YT-146), Int'l Dragon Class II, Two Edwardian Launches In the Gallery: Catboat, International-Dragon-Class, Spray Link to comment Share on other sites More sharing options...
*Hans* Posted September 20, 2014 Share #15 Posted September 20, 2014 It is quite confusing, and once learned one system, you never get really used to the other system. Then there is the other "problem" that it almost never is a round number. F.i. 1/16" is 1,5875 mm - which is not common when you want to buy wood f.i. Here you take 1,5 or 2 mm.... Quote Hans Owner of Kolderstok Models - 17th century Dutch ships. Please visit www.kolderstok.com for an overview of the model kits available Link to comment Share on other sites More sharing options...
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