Odd Ground Control, run away condition

Hey,

At some point today, after responding fine to things, GC’s direction buttons (xy) chose to ignore my distance input and just run off in the direction chosen. Hitting Stop in GC worked to stop the machine. This happened with Z also after hitting ‘return to home’, lifting the Z-axis for rapid travel and never stopping, eventually hitting the stops for the vertical adjustment.

No damage occurred but, If let to run, the machine would continue beyond its limits. I stopped and reset locations and tried again and it remained.

GC 1.10, MacOS 10.13.x

Not quite sure but its possible, I might have put my machine to sleep and wake, with GC open, prior to this happening,

Restarting GC solved the situation.

cheers,

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This sounds to me like a situation where the machine was in mm mode and the computer was in inches mode, does that sound possible?

If so all of your commands would be 25 times too large…which is an issue :grimacing:

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yeah thats quite easily the problem. right on thanks!

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@bar is there some kind of fail safe where the machine knows it’s limits are a 4x8 area so if told to go outside that it will ignore it or stop no matter what?

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the machine dimensions are the limits to how far it will move.

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Understood but the motors and software will try to take the sled around the town if told to. I’m asking about a software limit before the mechanical limit of falling off the backer or running out of chain and burning up the motors/cca etc.

There aren’t limits in the software - there’s an opportunity :slightly_smiling_face:. Software limits will need to accommodate different frame geometries and positions for the ‘Home 0,0’ location though. A good challenge.

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I’d be wary of software limits. It could cause some serious issues when the machine loses position. Not to say that it shouldn’t be tackled by someone, but it would take some serious testing before it would likely be ready for prime time inclusion in GC.

I fully agree - the best safety device is the operator present and watchful. The times my sled went ‘off the rails’ were my fault for not being around to spot the situation.

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There is a software llimit at the edge of the board. You can test it my trying to send the router off the edge, it should stop right at the edge

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keep in mind that if the system doesn’t know where the sled is, it can’t enforce
any limit.

That’s the usual situation that people have when the sled takes off doing
strange things.

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@bar Is this something that is modifiable? I’m building a half Maslow with the capability to cut a full 4x8 on occasion. Would be nice if I could change the dimensions of the boundary.

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