[ZE...] Posted March 28, 2018 Share Posted March 28, 2018 I've got a part that requires a flip in the middle of the program. The secondary alignment is found using manual probing points. This alignment shares 3/4 features with the base alignment. I have 2 base alignment match "characteristics"(resources/utilties/etc/etc) that use circles found on both alignments. These circles are located in both base/secondary alignments which are perpendicular to each other. I can get the program to correctly scan features after the flip/secondary alignment using CNC. My issue is that I cannot get an accurate measurement between features across both alignments. I'm trying to measure the distance between planes. The first plane is scanned with respect to the base alignment. The second plane is scanned with respect to the secondary alignment after the flip. The measured distance appears to be the actual distance between the 2 planes without taking into account the base alignment match, ~6.7". This measurement appears to be the distance between the 1st plane's location on the base alignment and the 2nd plane's location on the secondary alignment. Any insight would be greatly appreciated. EDIT: The Z location of the 2nd plane after the flip is correct, so it appears my 0,0,0 location after the flip is correct. Jonathan Sweeney | 03-14-2018 07:16 PM | Link to comment Share on other sites More sharing options...
[ZE...] Posted March 28, 2018 Author Share Posted March 28, 2018 If anyone has a solution to this please post. I write programs with flips in them all of the time and I've yet to figure this out; However, I haven't really played with measuring features from both sides of the flip against each other. I'm going to do some playing and try to figure this out. Chad Watton | 03-14-2018 07:55 PM | Link to comment Share on other sites More sharing options...
[ZE...] Posted March 28, 2018 Author Share Posted March 28, 2018 Can you align to the same plane? Then remember that one length will be negative and the other positive. So results element can flip those numbers and add them together. Just my thought , never tried it ! Dave Scott! | 03-14-2018 08:34 PM | Link to comment Share on other sites More sharing options...
[ZE...] Posted March 28, 2018 Author Share Posted March 28, 2018 It appears something else may also be wrong with my secondary alignment. It still scanned correctly, but the orientation is wrong. I believe this issue might be different than the issue that originated the post. @Dave I have the Vast XXT RDS. The problem is there are holes and stuff on the underside of the part that are referenced via GD&T After correcting the secondary alignment X,Y,Z directions to properly represent the part's orientation on the machine, the machine cannot properly location the part in 3D space when in CNC mode. Jonathan Sweeney | 03-14-2018 11:25 PM | Link to comment Share on other sites More sharing options...
[ZE...] Posted March 28, 2018 Author Share Posted March 28, 2018 I've only done this once, but it was without a model tied to it (wasn't transforming Z- to Z+ for the second alignment). The solution for mine was to do perpendicular of the shared datum (center cylinder I'm assuming in your case) to each of the planes and add the lengths in result element. worked like a charm. Not sure about your secondary issue. Samuel Young | 03-14-2018 11:34 PM | Link to comment Share on other sites More sharing options...
[ZE...] Posted March 28, 2018 Author Share Posted March 28, 2018 Can you stand the part up ? (Change the X to Z) You may not be able to get the WHOLE part in one program . Dave Scott! | 03-15-2018 12:54 PM | Link to comment Share on other sites More sharing options...
[ZE...] Posted March 28, 2018 Author Share Posted March 28, 2018 I guess I could do that. I'd just like to learn how to flip the part and get it to align correctly at this point. I feel it might be a good skill to add to my toolbox. I think I might be able to get the measurements with clever use of construction geometry and formulas. The only thing stopping me now is getting the part to align after the flip. Jonathan Sweeney | 03-15-2018 01:53 PM | Link to comment Share on other sites More sharing options...
[ZE...] Posted March 28, 2018 Author Share Posted March 28, 2018 After flipping the part and running secondary alignment, can't you use the plane from the base alignment in a new alignment that you can use for the plane in the secondary alignment? Would the Z value of the plane in the secondary alignment then show the correct distance between the 2? Sorry, maybe I'm confused. haha Marc Distefano | 03-17-2018 01:57 AM | Link to comment Share on other sites More sharing options...
[ZE...] Posted March 28, 2018 Author Share Posted March 28, 2018 I've only done this once but, inside your strategy after the stop to flip the part. Create a simply 3,2,1 alignment and changed the mode to manual from cnc for those 3 features kind of like a start alignment for the flip then off that alignment have another CNC alignment based off the flip manual alignment and it worked pretty well. Matt Janssen | 03-19-2018 01:53 PM | Link to comment Share on other sites More sharing options...
[ZE...] Posted March 28, 2018 Author Share Posted March 28, 2018 Quote ---@Dave I have the Vast XXT RDS. The problem is there are holes and stuff on the underside of the part that are referenced via GD&T--- Doesn't the GD&T need the first alignment to be correct? In my opinion this looks risky. Dave Scott! | 03-19-2018 06:53 PM | Link to comment Share on other sites More sharing options...
[ZE...] Posted March 28, 2018 Author Share Posted March 28, 2018 @Dave, The first alignment is correct. The second alignment is not correct. I am going to try some things today to get a correct secondary alignment. Jonathan Sweeney | 03-20-2018 04:26 PM | Link to comment Share on other sites More sharing options...
[ZE...] Posted March 28, 2018 Author Share Posted March 28, 2018 I successfully got the CMM to locate the part after the flip. The planar rotation lock needed to be a plane instead of a line. I have changed the features for both base and secondary alignment to measure the same features as well. My next question is can I set up a secondary clearance plane? Id like to set up a custom clearance plane for the secondary alignment that will let me safely navigate after the flip. Jonathan Sweeney | 03-27-2018 07:37 PM | Link to comment Share on other sites More sharing options...
Recommended Posts
Please sign in to comment
You will be able to leave a comment after signing in