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 - 查看单个帖子 - Polar angle (PA) axis definition of dimension (true position)

The polar angle PA and polar range PR represent the location of the feature in polar coordinates. The DEV of PA, PR is the deviation of the measured location from nominal expressed as the deviation in PA, PR. Since legacy true position reports these deviations in the current alignment, if you have aligned to the center of the considered feature, then the DEV of PA, PR would represent the deviation angle, range. Otherwise (not aligned to the center of the considered feature), the DEV of PA, PR represents the deviation of the nominal location. With FCF’s, if you are reporting in Datum reference frame alignment and the DRF is aligned to the center of the considered feature, then the DEV of PA, PR would again represent the deviation angle, range. As far as I know, PC-DMIS has behaved this way since day 1.

Fig.1 the definition of the polar angle (PA) at workplane_Z

2009-09-24, 09:43 AM	#1
huangyhg 超级版主注册日期: 04-03 帖子: 18592 精华: 36 现金: 249466 标准币资产: 1080358888 标准币	Polar angle (PA) axis definition of dimension (true position) The polar angle PA and polar range PR represent the location of the feature in polar coordinates. The DEV of PA, PR is the deviation of the measured location from nominal expressed as the deviation in PA, PR. Since legacy true position reports these deviations in the current alignment, if you have aligned to the center of the considered feature, then the DEV of PA, PR would represent the deviation angle, range. Otherwise (not aligned to the center of the considered feature), the DEV of PA, PR represents the deviation of the nominal location. With FCF’s, if you are reporting in Datum reference frame alignment and the DRF is aligned to the center of the considered feature, then the DEV of PA, PR would again represent the deviation angle, range. As far as I know, PC-DMIS has behaved this way since day 1. Fig.1 the definition of the polar angle (PA) at workplane_Z __________________ 借用达朗贝尔的名言：前进吧，你会得到信心! [url="http://www.dimcax.com"]几何尺寸与公差标准[/url]