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		几何尺寸与公差论坛------致力于产品几何量公差标准GD&T (GDT:ASME)\|New GPS(ISO)研究/CAD设计/CAM加工/CMM测量 » 欧氏空间：CAX软件开发（二）基本模块 » CMM » 测量技术 » 坐标测量机
Length Metrology FAQs

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2007-07-22, 05:32 PM	#1
yogy 高级会员注册日期: 06-11 帖子: 1527 精华: 15 现金: 6353 标准币资产: 6353 标准币	Length Metrology FAQs General How often should my gauges/instruments be calibrated? Do you know of any good dimensional metrology books? What is the conversion between inches and metres? On what basis is one inch exactly equal to 25.4 mm? Has the imperial inch been adjusted to give this exact fit and if so when? Are inches still legal units? Does NPL still perform calibration of items in imperial units, e.g. inch gauge blocks? Do you still use the 'metre bar' as the length standard? Do you calibrate micrometers and callipers? Where can I buy engineering standards such as gauge blocks, angle gauges etc? How do I calculate the compression of a cylinder between flat parallel anvils? I am starting up a new laboratory. What do I need to consider? Does NPL calibrate test sieves? Where can I get my theodolite calibrated? Does NPL still calibrate sextants? Is there a difference between accuracy and uncertainty?

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2007-07-22, 05:37 PM	#2
yogy 高级会员注册日期: 06-11 帖子: 1527 精华: 15 现金: 6353 标准币资产: 6353 标准币	回复: Length Metrology FAQs http://nvl.nist.gov/nvl3.cfm?doc_id=89&s_id=117

2007-07-22, 05:37 PM	#3
yogy 高级会员注册日期: 06-11 帖子: 1527 精华: 15 现金: 6353 标准币资产: 6353 标准币	回复: Length Metrology FAQs www.npl.co.uk/length/faqs/general.html

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