The following are important points about the Roughness scan measurement:
When you create a Roughness probe file, you need to ensure that T1 is created with a Support Pin. If you use a Roughness sensor with an Oblique cone, you must define T2 as the hot spot at the center of the cone.
The TIP command in the Edit window for the T1 tip type displays as:
TIP/T1A-30B90, SHANKIJK=0.5, 0, 0.866, SCANIJK=-0.866, 0, 0.5, NORMALIJK=0.5, 0, 0.866, ANGLE=90
Scan ijk - This is the tip vector of the scan.
When the Roughness scan command inserts a tip command in the Edit window, PC-DMIS sets the scan ijk direction to be the same as the scan direction.
If you type or select the Tip command to insert in the Edit window, PC-DMIS calculates the scan ijk.
Normal ijk - This is the normal vector for the support pin.
When the Roughness scan command inserts a tip command in the Edit window, PC-DMIS sets the normal ijk to be the same as the scan normal vector of the start point.
If you type or select the Tip command to insert in the Edit window, PC-DMIS calculates the normal ijk.
With the software uses the scan ijk and normal ijk vectors, it must re-calculate the tip angles for the Roughness scan each time you execute the measurement routine. Every time you place a part on the CMM, some change occurs in its position in the machine coordinate system. Therefore, this requires re-calculation of the T1 angles to scan the same line for the Roughness scan. For the T2 type of roughness sensor tip, PC-DMIS does not record the scan ijk and normal ijk vectors. You can use T2 tips to measure roughness in small holes. These tips are self-centered in the hole and its angles cannot be adjusted during execution.
When you use a T2 type of TIP, the Roughness scan command cannot automatically determine the required tip angles.
Roughness scans are generated for the type of roughness sensor. You should not change the sensor type after creation of Roughness scan commands. It is not feasible to scan all surfaces with all types of sensors. If you need to change the type of roughness sensor, you must re-create all roughness scans.
If you need to re-calibrate roughness sensor for kinematics, you must re-import kinematics.
More: