Rough cut too deep

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Hitch
Posts: 18
Joined: Thu Nov 11, 2010 5:33 pm

Rough cut too deep

Post by Hitch »

I've had this happen on two occasions now. Carve a beautiful 3d image rough and finish (VCarve Pro V9) the first time and the next the rough cut is too deep. Time wasted - 4 hours. Any suggestions as to the cause?

Ron

tonydude
Posts: 1581
Joined: Tue Aug 17, 2010 9:23 am
Location: Buffalo,NY

Re: Rough cut too deep

Post by tonydude »

If you hit your upper limits on the z axis you will lose your z zero. It thinks it's still moving but in reality it's not, but the computer thinks it is. therefor if you think it's at say 1.5 but the machine thinks it's at 2 and the next time you use it, it's not where you think it is. You must rezero your z axis. I hope I explained it.

Tony
Buffalo,NY

"What will matter is not what you bought but what you built; not what you got, but what you gave”

Aspire 11.015, photo vcarve, cnc mako shark extended bed with the new upgraded HD 5 gantry with Led pendent.

Hitch
Posts: 18
Joined: Thu Nov 11, 2010 5:33 pm

Re: Rough cut too deep

Post by Hitch »

Not sure I understand. For the second piece, I set the bit on the starting point and zero all 3 axis's and run the program. I can tell immediately that it's going to deep. Looking for oil?

tonydude
Posts: 1581
Joined: Tue Aug 17, 2010 9:23 am
Location: Buffalo,NY

Re: Rough cut too deep

Post by tonydude »

Is the z axis zero set on top of material or bottom of material?

Tony
Buffalo,NY

"What will matter is not what you bought but what you built; not what you got, but what you gave”

Aspire 11.015, photo vcarve, cnc mako shark extended bed with the new upgraded HD 5 gantry with Led pendent.

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Bob
Posts: 1252
Joined: Sun Aug 08, 2010 3:35 pm

Re: Rough cut too deep

Post by Bob »

Hitch wrote:I've had this happen on two occasions now. Carve a beautiful 3d image rough and finish (VCarve Pro V9) the first time and the next the rough cut is too deep. Time wasted - 4 hours. Any suggestions as to the cause?

Ron
Ron,
I have two questions:
Did you use the same thickness material for each carving?
What is the clearance (Z1) and Home/start Z gap set at?
The answers to these two questions could support what Tony is saying.
Bob
"Focus"
Antonie Van Leeuwenhoek (Developer of the microscope.)

Rando
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Joined: Tue Jan 06, 2015 3:24 pm
Location: Boise, ID
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Re: Rough cut too deep

Post by Rando »

Another part of the puzzle is: how deep is too deep? Is the difference between the two carvings on the order of tenths of an inch? Or is it larger, like 2 inches?

One thing to remember if we're talking about a v-bit carving with a 60- or 90-degree bit, variations in height produce very pronounced changes in line width. So if, say, one board was mounted warp "up" and the other warp "down", and there was say a 0.050" height difference (not uncommon in large, unplaned wood panels), then a cut that was 0.025" deep would change dramatically if that shape isn't either accounted for, or removed. I wonder if that might be part of the problem?

Regards,

Thom
=====================================================
ThomR.com Creative tools and photographic art
A proud member of the Pacific Northwest CNC Club (now on Facebook)

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