Dear forum members, does anybody can share his/her experience of round parts alinment when using a portable arm? I tried to align tube with two rounded slots and through holes but each time I faced with inversion of two coordinates after alignment - when moving probe in x+ or z+ ditection it translated in x- or z- direction accordingly in pc dmis interface. I have no any idea what should I start from to prevent this inversion. Please help.
I don't have a Romer, but I work exclusively with cylindrical parts. The machine has a rotary table that all of the parts are loaded on to. I do the following:
- Measure a circle around the OD
- Take a point on the face
- Rotation Feature
Now, usually there is a notch on the part. I'd take two points (one on each side, left/right) and construct a midpoint. I would construct a
parallel line
from the circle to the constructed point. Keep in mind the line's "K" value, which should be positive.
The circle's "J" value should be positive. Create an alignment:
Level Y+ to the circle who's "J" value is probably 1
Set the circle to the X and Z origins
Set Y origin to the face of the part
Rotate Z+ to the line (who's "K" value is probably 1) about Y+
The problems I would usually have with aligning round parts was in the construction of the parallel line I use to align. If I were to make the line from the midpoint to the circle, "K" would be negative, A.K.A down, thus if I try and align Z to this line, it would point downwards. To fix this I just recreate the line from the circle to the midpoint.
This may not be what you're looking for, but I hope you (and of course anyone else) can take something from my process.
I don't have a Romer, but I work exclusively with cylindrical parts. The machine has a rotary table that all of the parts are loaded on to. I do the following:
- Measure a circle around the OD
- Take a point on the face
- Rotation Feature
Now, usually there is a notch on the part. I'd take two points (one on each side, left/right) and construct a midpoint. I would construct a
parallel line
from the circle to the constructed point. Keep in mind the line's "K" value, which should be positive.
The circle's "J" value should be positive. Create an alignment:
Level Y+ to the circle who's "J" value is probably 1
Set the circle to the X and Z origins
Set Y origin to the face of the part
Rotate Z+ to the line (who's "K" value is probably 1) about Y+
The problems I would usually have with aligning round parts was in the construction of the parallel line I use to align. If I were to make the line from the midpoint to the circle, "K" would be negative, A.K.A down, thus if I try and align Z to this line, it would point downwards. To fix this I just recreate the line from the circle to the midpoint.
This may not be what you're looking for, but I hope you (and of course anyone else) can take something from my process.
