# Too much force?

**URL:** <https://forum.universal-robots.com/t/too-much-force/31646>\
**Category:** Technical Questions\
**Created:** [November 30, 2023, 11:20am UTC](https://forum.universal-robots.com/t/too-much-force/31646 "2023-11-30T11:20:30Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![luca-0](https://avatars.discourse-cdn.com/v4/letter/l/41988e/32.png) [@luca-0](https://forum.universal-robots.com/u/luca-0)\
**Post date:** [November 30, 2023, 11:20am UTC](https://forum.universal-robots.com/t/too-much-force/31646/1 "2023-11-30T11:20:30Z")

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Hello,

Im using Force mode to deburr some holes. I’ve applied a kind of drill to the flange and I go into force mode with the force set to 75N (too high maybe?). I use a directional move to go straight to the hole, drill and go backwards, but it measures force up to 250/300N and goes into error.

Should i be using less force? is it even a good idea to use force mode with something like a drill which moves and makes the force measuring unstable.

any help appreciated

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**Author:** ![efn](https://avatars.discourse-cdn.com/v4/letter/e/35a633/32.png) [@efn](https://forum.universal-robots.com/u/efn)\
**Post date:** [November 30, 2023, 11:48am UTC](https://forum.universal-robots.com/t/too-much-force/31646/2 "2023-11-30T11:48:41Z")

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Can you upload a screenshot of your program sequence?

I haven’t done drilling myself, but I can’t image it shouldn’t work. 🙂  
Maybe you’re need a zero\_ftsensor() before you start Force mode.

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<div class="post-metadata">

**Author:** ![luca-0](https://avatars.discourse-cdn.com/v4/letter/l/41988e/32.png) [@luca-0](https://forum.universal-robots.com/u/luca-0)\
**Post date:** [November 30, 2023, 12:30pm UTC](https://forum.universal-robots.com/t/too-much-force/31646/3 "2023-11-30T12:30:03Z")

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its programmed in polyscope, and very simple.

MoveL  
-Force 75N Z direction  
-directional move, Z-  
-until 7mm  
-wait 0.25s

directional move, Z+  
untill 7mm

maybe im using it the wrong way or something but i have no clue why its applying so much force that it goes into error

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<div class="post-metadata">

**Author:** ![efn](https://avatars.discourse-cdn.com/v4/letter/e/35a633/32.png) [@efn](https://forum.universal-robots.com/u/efn)\
**Post date:** [November 30, 2023, 12:42pm UTC](https://forum.universal-robots.com/t/too-much-force/31646/4 "2023-11-30T12:42:33Z")

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Try removing the Direction/move in Z-. If the Force is also moving the robot i Z-, it might cause issues.

Also take a screenshot of the program. It tells a lot more about your structure. 🙂 And highlight the Force command in the screenshot.

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<div class="post-metadata">

**Author:** ![luca-0](https://avatars.discourse-cdn.com/v4/letter/l/41988e/32.png) [@luca-0](https://forum.universal-robots.com/u/luca-0)\
**Post date:** [November 30, 2023, 12:49pm UTC](https://forum.universal-robots.com/t/too-much-force/31646/5 "2023-11-30T12:49:07Z")

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the program is only on the TP, I don’t really work with PC so I cannot screenshot as far as I know. and does force in Z- direction automatically move the TCP in that direction until it hits the force? I did not know that. I’ll change that and try some more

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**Author:** ![efn](https://avatars.discourse-cdn.com/v4/letter/e/35a633/32.png) [@efn](https://forum.universal-robots.com/u/efn)\
**Post date:** [November 30, 2023, 1:19pm UTC](https://forum.universal-robots.com/t/too-much-force/31646/6 "2023-11-30T13:19:13Z")

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You can take a picture with a phone. 🙂

Force in Z direction will move the robot in the Z direction, yes.

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**Author:** ![eric.feldmann](https://avatars.discourse-cdn.com/v4/letter/e/94ad74/32.png) [@eric.feldmann](https://forum.universal-robots.com/u/eric.feldmann)\
**Post date:** [November 30, 2023, 10:00pm UTC](https://forum.universal-robots.com/t/too-much-force/31646/7 "2023-11-30T22:00:04Z")

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It may be that the drill is binding at some point and you’re seeing a massive wrenching force on the wrist joint, not necessarily a large force parallel to the direction of motion.
