Z Gouging on thick wood

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rtroiani
Posts: 5
Joined: Thu Jan 12, 2017 12:12 am

Z Gouging on thick wood

Post by rtroiani » Fri Mar 03, 2017 7:59 pm

Hi Guys,
I have an issue when I use thicker wood (1.5" and above slabs). I set the Z as usual, usually starting with a .25 end mill for a roughing pass. However, it seems to dive right in past the .125 per pass I tell it to.

I never have this problem on .75" wood, only the thicker stuff. I'm using VCarve Desktop and height of the wood is correct.

Anyone else have this and have any ideas?

fasteddy
Posts: 68
Joined: Sun Mar 24, 2013 10:27 pm

Re: Z Gouging on thick wood

Post by fasteddy » Fri Mar 03, 2017 8:32 pm

Are you zeroing your Z using the bed or the top of the work surface?

NickT
Posts: 11
Joined: Sun May 15, 2016 3:32 pm
Location: New Jersey

Re: Z Gouging on thick wood

Post by NickT » Sat Apr 15, 2017 3:53 pm

Funny this is coming up as I have the very same issue. VCarve Desktop as well..

Given this..

T1M6
G17
G20
G0Z0.8000
G0X0.0000Y0.0000S12000M3
G0X2.8170Y2.7465Z0.5000
G0Z0.2000
G1Z-0.1250F15.0


Instead of the last command going Z-0.125 its going down almost -0.5. Very strange. And yes my Z-Zero is correct and this was .75 thick material. I went as far as deleting the toolpaths and recreating them, same thing a second time around. Checked to make sure there were no offsets hiding, none found. But given the GCode above there is nothing there saying to go anything greater than Z-0.125 and nothing after either.
Odd thing is that I have been cutting boxes all week and no issues.

I installed bCNC so I can run the command manually and see what happens. Also running it with the router off and no wood until I find the issue.

-Nick

NickT
Posts: 11
Joined: Sun May 15, 2016 3:32 pm
Location: New Jersey

Re: Z Gouging on thick wood

Post by NickT » Sat Apr 15, 2017 4:55 pm

ok ok ok.. I will be the first to say that most, if not all, mistakes are made behind the keyboard.

This time I left the router off, no wood mounted and no hearing protection... Then I heard it....

The Z Axis hitting the upper limit.. DOH!

I had changed by safe Z height to 0.5 and with the combination of wood thickness and bit mounting it was too much.
Took it back down to 0.2 and all is good now..

Silly mistake, but hey we all do them from time to time.

Rtoiani.. Check you Z heights and see if you have the same issue I had...

Cheers,

Nick

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