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Offline kolias

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1st MDF
« on: September 02, 2009, 09:42:01 AM »
This is my 1st attempt to use my CNC router to cut a piece of MDF (MDF is something like pressboard but very smooth on both sides)

I’m attaching the DXF and LCAM files here and have set the parameters to the best I can. I will be using a 1/8” upcut straight bit.

Can anyone comment on my settings?  Did I miss something?
Nicolas
Nicolas

Offline ger21

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Re: 1st MDF
« Reply #1 on: September 02, 2009, 11:15:10 AM »
If you set Z=0 to the top of your workpiece, it won't cut anything. All your cuts are at Z=0
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html

Offline kolias

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Re: 1st MDF
« Reply #2 on: September 02, 2009, 02:47:42 PM »
If you set Z=0 to the top of your workpiece, it won't cut anything. All your cuts are at Z=0

I changed in LC (Layers), the Cut Depth value to -0.1250 and regenerated the gcode. Is this my problem?
Nicolas
Nicolas

Offline kolias

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Re: 1st MDF
« Reply #3 on: September 02, 2009, 04:49:43 PM »
Sorry, I also changed the Entities
Revised files attached
Nicolas
Nicolas

Offline ger21

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Re: 1st MDF
« Reply #4 on: September 02, 2009, 06:50:28 PM »
Try it using 0.125, NOT -0.125.

 I think LazyCAM wants a positive number for depth of cut, as it's now cutting .125 above the part.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html

Offline budman68

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Re: 1st MDF
« Reply #5 on: September 02, 2009, 06:57:49 PM »
Actually you want it to look like this for the depth in the picture below. Note: I only fooled with the depth so don't look at anything else as an example!  ;)

Dave
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Just because I'm a Global Moderator, don't assume that I know anything !

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Offline kolias

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Re: 1st MDF
« Reply #6 on: September 02, 2009, 07:39:08 PM »
Try it using 0.125, NOT -0.125.

 I think LazyCAM wants a positive number for depth of cut, as it's now cutting .125 above the part.

The manual says this number should be negative, unless I dont understand something
Nicolas
Nicolas
Re: 1st MDF
« Reply #7 on: September 02, 2009, 08:25:48 PM »
A slice of foam insulation board is good instead of MDF for trial runs, it cuts cleanly and you can't snap a cutter in it even if you rapid through it with no spindle on ;)

Offline ger21

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Re: 1st MDF
« Reply #8 on: September 02, 2009, 08:48:31 PM »
Try it using 0.125, NOT -0.125.

 I think LazyCAM wants a positive number for depth of cut, as it's now cutting .125 above the part.
I don't use lazyCCAM, but the code you posted is cutting at Z 0.125.
The manual says this number should be negative, unless I dont understand something
Nicolas
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html

Offline kolias

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Re: 1st MDF
« Reply #9 on: September 02, 2009, 10:58:50 PM »
Sorry Gerry, my mistake

I will correct it
Nicolas
Nicolas