First pass is too deep - Router Forums
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post #1 of 35 (permalink) Old 05-03-2019, 07:54 AM Thread Starter
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Default First pass is too deep

I have not noticed this before but in this project it was my first attempt at milling Aluminum. The plate is 1/8" thick (0.125) and 18"x18" I set everything up to use Virtual Zero. I'm running V-Carve Pro 9.5

I set it to a maximum cut depth of 0.030 and the end mill set to maximum pass depth of 0.010 for a total of 3 passes. See pics

The problem is the first pass was 0.035! The next 2 passes were correct at 0.010 each. I ended up with 0.055 total depth. The total depth I was OK with because I had enough material thickness to work with but the initial pass of 0.035 caused the end mill to "Dig" in or be pulled down into the material which caused a few imperfections in the sign. I checked a few tutorials and they all have the Start Depth at 0.0. And I did set it up to use the material surface for starting point.

Any ideas why my first pass is going way beyond the set point? What am I missing?
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Last edited by OCEdesigns; 05-03-2019 at 07:57 AM.
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post #2 of 35 (permalink) Old 05-03-2019, 08:01 AM Thread Starter
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The picture of the R is a test piece I tried after I made the sign and it did it again. (The R is actually from the sign. I just set it up separately on another piece of material)

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post #3 of 35 (permalink) Old 05-03-2019, 08:31 AM
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Sorry I'm no help but at least you're not alone. My first aluminum cut did the exact same thing. I never did figure it out. Broke 2 bits, rebooted, recalculated everything and then it worked fine.
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post #4 of 35 (permalink) Old 05-03-2019, 08:52 AM
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Make sure you're using a coolant cutting Alum.
Some do get by on plain air others do WD40.

I hate the WD40 smell and the mess it leaves.

Actually surprised at the cost of the FogBuster

Pretty soon I'll be cutting alum but not looking forward to
giant mess that'll be left all around the machine.

When doing the Alum cut setup, wouldnt be just the same as you
normally would? just a less than thru cut?

Can that program do side-to-side cuts? They look better
than the spiral if paint filling.
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post #5 of 35 (permalink) Old 05-03-2019, 08:59 AM Thread Starter
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Quote:
Originally Posted by UglySign View Post
Make sure you're using a coolant cutting Alum.
Some do get by on plain air others do WD40.

I hate the WD40 smell and the mess it leaves.

Actually surprised at the cost of the FogBuster

Pretty soon I'll be cutting alum but not looking forward to
giant mess that'll be left all around the machine.

When doing the Alum cut setup, wouldnt be just the same as you
normally would? just a less than thru cut?

Can that program do side-to-side cuts? They look better
than the spiral if paint filling.
I did the WD40 and it worked real well. I actually prepped the entire area pretty well to keep the mess as contained as possible. I can do the side to side cuts and have done that several times in wood. My only issue with this was the initial cut of 0.035 depth instead of the programmed 0.010 depth.

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post #6 of 35 (permalink) Old 05-03-2019, 10:21 AM
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Check your Safe Z and Home position settings.

Does the preview show the deep cut?

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post #7 of 35 (permalink) Old 05-03-2019, 10:25 AM Thread Starter
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Quote:
Originally Posted by honesttjohn View Post
Check your Safe Z and Home position settings.

Does the preview show the deep cut?
My Safe Z is set at 0.800
I didn't look to see if the preview shows it. I can check when I get home this afternoon.

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post #8 of 35 (permalink) Old 05-03-2019, 10:38 AM
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Quote:
Originally Posted by OCEdesigns View Post
My Safe Z is set at 0.800
I didn't look to see if the preview shows it. I can check when I get home this afternoon.
Your pic shows Safe Z at .2 - not .8

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post #9 of 35 (permalink) Old 05-03-2019, 10:40 AM Thread Starter
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Quote:
Originally Posted by honesttjohn View Post
Your pic shows Safe Z at .2 - not .8
You're right. My Home Z is .8 and Safe Z is .2

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post #10 of 35 (permalink) Old 05-03-2019, 11:26 AM
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Is it possible that you forgot to recalculate your toolpath after setting your passes = 3? I have forgotten to do that on occasion after making a toolpath change. You could look at the gcode and see what it is being told to do on the first pass.

I would also recommend ramping instead of plunging to cut depth.
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