[Th...] Posted May 22, 2023 Share Posted May 22, 2023 Before giving Zeiss a call has this happened to anyone else. I tried homing the CMM and it stopped when the head is at top most Z position. Is there a z limit switch I can press to lower the head a little. I cannot move the head with the joystick. This is for an AccuraUntitled.png Link to comment https://qualityforum.zeiss.com/topic/7108-cmm-cannot-turn-on-motor-because-of-limit-switch/ Share on other sites More sharing options...
[Mi...] Posted May 23, 2023 Share Posted May 23, 2023 You need to manualy move Z axis. Link to comment https://qualityforum.zeiss.com/topic/7108-cmm-cannot-turn-on-motor-because-of-limit-switch/#findComment-29492 Share on other sites More sharing options...
[To...] Posted May 23, 2023 Share Posted May 23, 2023 Please sign in to view this quote. It has been a while since I've done this but as I recall there a small hole on the side of the Z cover that you can stick a hex wrench, screwdriver or other rigid device that releases the brake that is holding the Z ram in place. Link to comment https://qualityforum.zeiss.com/topic/7108-cmm-cannot-turn-on-motor-because-of-limit-switch/#findComment-29494 Share on other sites More sharing options...
[Ke...] Posted May 23, 2023 Share Posted May 23, 2023 If you could post a picture of the front of the Z of your Accura, that may be helpful. The brake release access can be in a couple different locations, depending on the Accura type. Link to comment https://qualityforum.zeiss.com/topic/7108-cmm-cannot-turn-on-motor-because-of-limit-switch/#findComment-29496 Share on other sites More sharing options...
[Th...] Posted May 23, 2023 Author Share Posted May 23, 2023 There's a hole looking up on the Z axis that I can use a rod to push up against inside the hole and I can hear air releasing but the I cannot pull the Z axis down or upP1010319.JPGP1010318.JPGP1010317.JPGP1010316.JPGP1010315.JPG Link to comment https://qualityforum.zeiss.com/topic/7108-cmm-cannot-turn-on-motor-because-of-limit-switch/#findComment-29498 Share on other sites More sharing options...
[To...] Posted May 23, 2023 Share Posted May 23, 2023 This might be for the X axis, but I don't know. Is there nothing on the side? Link to comment https://qualityforum.zeiss.com/topic/7108-cmm-cannot-turn-on-motor-because-of-limit-switch/#findComment-29500 Share on other sites More sharing options...
[Ke...] Posted May 23, 2023 Share Posted May 23, 2023 That is the correct hole to release the brake for this model. You will need to hold down the button inside while you pull down the Z ram. It will take a bit of force, as there is still mechanical braking to prevent the Z from just slamming down under gravity. Link to comment https://qualityforum.zeiss.com/topic/7108-cmm-cannot-turn-on-motor-because-of-limit-switch/#findComment-29502 Share on other sites More sharing options...
[Ri...] Posted May 23, 2023 Share Posted May 23, 2023 Please sign in to view this quote. It's on the bottom now. Just remove that front cover, and you will see the one that you need to press in to release air. Link to comment https://qualityforum.zeiss.com/topic/7108-cmm-cannot-turn-on-motor-because-of-limit-switch/#findComment-29504 Share on other sites More sharing options...
[Th...] Posted May 23, 2023 Author Share Posted May 23, 2023 Please sign in to view this quote. Thanks!. I used more force and it moved down enough to clear the limit switch. Link to comment https://qualityforum.zeiss.com/topic/7108-cmm-cannot-turn-on-motor-because-of-limit-switch/#findComment-29506 Share on other sites More sharing options...
[Ke...] Posted May 23, 2023 Share Posted May 23, 2023 Outstanding. I would then recommend using the joysticks to move the probe head to roughly the center of the volume in all 3 axes, and turn the speedknob down to around 20% before attempting to home the CMM (this is often not necessary, but I find that in situations like this where the CMM failed to home due to hitting an endlimit it often increases the success of the next rehome) Link to comment https://qualityforum.zeiss.com/topic/7108-cmm-cannot-turn-on-motor-because-of-limit-switch/#findComment-29508 Share on other sites More sharing options...
[Dy...] Posted May 24, 2023 Share Posted May 24, 2023 Was this an Accura 1 or 2? My air release for Z is on the side of the Accura 220230524_075257.jpg Link to comment https://qualityforum.zeiss.com/topic/7108-cmm-cannot-turn-on-motor-because-of-limit-switch/#findComment-29510 Share on other sites More sharing options...
[Th...] Posted May 25, 2023 Author Share Posted May 25, 2023 Acurra 2. There is a side hole but the release switch can only be accessed from bottom hole. Link to comment https://qualityforum.zeiss.com/topic/7108-cmm-cannot-turn-on-motor-because-of-limit-switch/#findComment-29512 Share on other sites More sharing options...
[Ro...] Posted May 30, 2023 Share Posted May 30, 2023 We have the same problem, but in Y. I don't know what the official fix is going to be, but we got it to home after cleaning the glass scales. I wiped down the scales a couple times. i just put a little alcohol on a rag and reach down and clean it, but it was still having issues. but when i went back and cleaned it again, spent more time making sure it was good and clean, it finally worked. Link to comment https://qualityforum.zeiss.com/topic/7108-cmm-cannot-turn-on-motor-because-of-limit-switch/#findComment-29514 Share on other sites More sharing options...
[No...] Posted May 30, 2023 Share Posted May 30, 2023 Please sign in to view this quote. We often had that phenomenon on our O-Inspect 322 when the axes were too close to the limits before homing. The machine would then fail to recognize the limits and hit the end stop. The only remedy was to move far enough from the limits before homing. I was very pleased to learn that on our new Conturas there' s no need to move the axes manually anymore. Even after hitting a limit you just activate the drives again and the CMM is ready to move. Well done! Link to comment https://qualityforum.zeiss.com/topic/7108-cmm-cannot-turn-on-motor-because-of-limit-switch/#findComment-29516 Share on other sites More sharing options...
[Je...] Posted October 2, 2023 Share Posted October 2, 2023 This has happened to me this morning on a Prismo in the +Y Axis. Where can I find a release to move off of the limit switch? Link to comment https://qualityforum.zeiss.com/topic/7108-cmm-cannot-turn-on-motor-because-of-limit-switch/#findComment-29518 Share on other sites More sharing options...
[Ja...] Posted October 2, 2023 Share Posted October 2, 2023 This happened to us many years ago when our Contura was new. I was not the programmer back then so I am not sure but I thought someone moved the CMM home position away from the limit. He was actually Zeiss training teacher. I know he did something to it. We never had it happen again. Link to comment https://qualityforum.zeiss.com/topic/7108-cmm-cannot-turn-on-motor-because-of-limit-switch/#findComment-29520 Share on other sites More sharing options...
[Ro...] Posted October 2, 2023 Share Posted October 2, 2023 Please sign in to view this quote. Just push it. It'll give you resistance but it'll move just by pushing. Link to comment https://qualityforum.zeiss.com/topic/7108-cmm-cannot-turn-on-motor-because-of-limit-switch/#findComment-29522 Share on other sites More sharing options...
[Jo...] Posted October 2, 2023 Share Posted October 2, 2023 Please sign in to view this quote. "Salt-n-Pepa's here, and we're in effect Want you to push it back Just push it " Link to comment https://qualityforum.zeiss.com/topic/7108-cmm-cannot-turn-on-motor-because-of-limit-switch/#findComment-29524 Share on other sites More sharing options...
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