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Old 03-13-2019, 01:03 PM
mcmahonk mcmahonk is offline
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Default Z lowering itself during job

Hi All!

Very new to CNC, after reading a lot of this forum I'm finally running through some simple test files and making chips. However I've noticed a problem on longer jobs I run. The Z will lower itself about 1/4" and then continue cutting the file like normal.

Here's an example of what it did last night. It happened about 71 minutes into the job. If you look closely the 4th layer is about double the depth of all the others and took out a chunk of the top layer on it's way down

Is this a static issue? it doesn't happen on shorter jobs. We have a small Hitachi compressor hooked up for air assist
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Stinger I SR-49, 1 HP HSD Spindle (ER 20), V-carve Pro, Performance package
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Old 03-13-2019, 01:22 PM
The real JP The real JP is offline
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Static can cause odd things to happen. Could have been the collet nut on the top layer there? How long is your bit?

Material cupping can come into play, check the workpiece and the spoilboard with a straight edge.

Could be a toolpathing error or a zeroing error.

There was something on here a while back about Z problems and it was some .ini setting but I don't remember it specifically.

Static or a simple mistake are usually the deal. You can look at your g code and see what the cut depth is.

I remember not zeroing a new bit one time. I changed them and put the new one in a really close to the right depth..... I was like " how is this a 1/16th off? "
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Last edited by The real JP; 03-13-2019 at 01:26 PM.
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  #3  
Old 03-13-2019, 01:50 PM
mcmahonk mcmahonk is offline
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Same bit for the whole job so I don't think zeroing is the issue. Bit is about 1 5/8" out of the collet, and everything seems square and tightly clamped to the board.

I will check the gcode and see if something changed half way through.

Thanks!
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