[Da...] Posted June 10, 2020 Share Posted June 10, 2020 Hello I have a long stylus (210mm) and I keep getting false collision errors when the probe retracts. You can see it "shake" when it retracts and stops. I have turned down "Speed" under travel in feature editor and turned down the "Probing Dynamic" neither seemed to help. Any ideas? Thanks, -Dave Link to comment Share on other sites More sharing options...
[Ke...] Posted June 10, 2020 Share Posted June 10, 2020 What probe head are you using & what is the stylus weight? XXT heads have stricter weight/length restrictions . Link to comment Share on other sites More sharing options...
[Da...] Posted June 10, 2020 Author Share Posted June 10, 2020 Vast XTR Gold, the stylus is well within the limits of the head. Link to comment Share on other sites More sharing options...
[Ri...] Posted June 10, 2020 Share Posted June 10, 2020 What type of feature is this? I typically see this with the Clearance Distance, not the Retract Distance. This is why I tend to run 0 Clearance Distance unless it's a tilted surface, and I need the Clearance Distance help me approach the surface perpendicular to the axis. Link to comment Share on other sites More sharing options...
[Da...] Posted June 10, 2020 Share Posted June 10, 2020 Please sign in to view this quote. What is your (Small) Z value on your Joystick box?Capture.JPG Link to comment Share on other sites More sharing options...
[Da...] Posted June 10, 2020 Author Share Posted June 10, 2020 Please sign in to view this quote. the problem is showing up on partial circles. the probe is an "L" configuration that I drive inside the part measure partial circles retract rotate repeat. It happens typically between scans, or re-scans, when it retracts from the surface and changes directions. Link to comment Share on other sites More sharing options...
[Da...] Posted June 10, 2020 Author Share Posted June 10, 2020 What is your (Small) Z value on your Joystick box? [/quote] I go a range of depths from around 7" to 0.25". I typically don't look at the jog box, but are you asking if there is correlation between the jog box and the programmed depth? Link to comment Share on other sites More sharing options...
[Da...] Posted June 10, 2020 Author Share Posted June 10, 2020 Please sign in to view this quote. I went and looked at the currently running program:IMG_20200610_133426.jpg Link to comment Share on other sites More sharing options...
[SH...] Posted June 10, 2020 Share Posted June 10, 2020 That small value is your probe deflection not the your measuring depth. your L-shaped configuration showcasing that you don't have counterweight I think that is your problem. Link to comment Share on other sites More sharing options...
[Da...] Posted June 10, 2020 Author Share Posted June 10, 2020 Please sign in to view this quote. Thank you Shabu, you are correct, there is no counter weight. I was told by our distributor that counter weight wasn't need on the newer Vast XTR Gold. the only way I could counter this is on the cube at the top by the rotary. Link to comment Share on other sites More sharing options...
[Ri...] Posted June 10, 2020 Share Posted June 10, 2020 Please sign in to view this quote. You most certainly need a stylus system counter-weighted. The VAST Gold (not the XTR) does allow for more unbalance, but always remember that any time you have a stylus system unbalanced you are causes unnecessary stress on the motors inside of the head. Link to comment Share on other sites More sharing options...
[Ke...] Posted June 10, 2020 Share Posted June 10, 2020 Please sign in to view this quote. What is the actual weight of your stylus vs XTR specs? If it is "well within" specs, then it may be a probe head issue. Do you have other similar styli to swap & test? Link to comment Share on other sites More sharing options...
[SH...] Posted June 10, 2020 Share Posted June 10, 2020 Please sign in to view this quote. This might be useful for you. Courtesy Tom Oakes.Tilt Torque.pdf Link to comment Share on other sites More sharing options...
[Da...] Posted June 11, 2020 Author Share Posted June 11, 2020 Please sign in to view this quote. The stylus system is 129 Grams, 210mm long. I left 5/8" of the stylus probe sticking out.L-Stylus.JPG Link to comment Share on other sites More sharing options...
[SH...] Posted June 11, 2020 Share Posted June 11, 2020 Please sign in to view this quote. I think, I have mistaken, no need of counterweight this like probe. Problem should be something different.. Link to comment Share on other sites More sharing options...
[Me...] Posted June 11, 2020 Share Posted June 11, 2020 This issue sound very familiar to me, an ongoing issue for a couple years now. I have attached a Field Service Report from Zeiss's finding but our Accura (Vast XT) has an issue with tapping and retracting from features in the Y direction (Shutting drives off and displaying collision errors due to shacking). Take a look at the report and see if its what you are dealing with.MFG_OFFICE_06_11_20_07_52_02.pdf Link to comment Share on other sites More sharing options...
[Da...] Posted June 11, 2020 Author Share Posted June 11, 2020 Please sign in to view this quote. Not quite the same Andre. The problem is in Y+ almost exclusively, it shows a collision but it doesn't shut the drives off, just gives a red light. I shortened my retract to 0.050" from 0.200" with the thought that it wouldn't allow it time to build enough velocity to shake and register a collision. Being inside the part I had to add drive points to avoid the geometry of the part the retract was avoiding. So far it ~seems~ to be working. I don't have this problem with other styli, but this is the only one I have configured like this. Link to comment Share on other sites More sharing options...
[Ke...] Posted June 11, 2020 Share Posted June 11, 2020 Perhaps a larger diameter extension on the top portion may add some rigidity? If clearance is an issue, you may need to use a longer stylus... #LastThoughts Link to comment Share on other sites More sharing options...
[Da...] Posted June 11, 2020 Author Share Posted June 11, 2020 Please sign in to view this quote. I appreciate the input, but this stylus is specifically configured to measure inside features of a family of three parts. I see your logic in using a using a larger Dia, but I'm curious if the added weight would add to the problem. This is all new to me (VAST) I miss the flexibility of RDS. Link to comment Share on other sites More sharing options...
[Da...] Posted June 17, 2020 Share Posted June 17, 2020 Please sign in to view this quote. Sorry that was only for Vast XXT heads not for XTR Gold heads the are self centering and don't rely on springs to make the correction. If you had an Vast XXT head and that number is above .800 or .900 you have damaged the XXT head. This is with no probe it is cased by a holding clip in the XXT head at comes unglued after a hard crash. Link to comment Share on other sites More sharing options...
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