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  #1  
Old Mon 01 December 2014, 06:02
renraku
Just call me: renraku
 
rome
Italy
working problems during series all the same at the same corner

Hi i had working problems during series, over a big MDF panel, i made many engraving rectangles with a ball tool, all rectangles have 3 corners equal and the left bottom corner is narrower, the root dxf design is a simple rectangle, the speed is not even fast, i really can not understanding why this is happened, someone can helping me to understanding the reasons? What i did wrong? What can i do for solve this problem? Thanks a lot to anyone.
i uploaded an picture about this problem, maybe you need to enlarge the image for seeing the wrong detail
Attached Images
File Type: jpg mistake.jpg (17.2 KB, 236 views)

Last edited by renraku; Mon 01 December 2014 at 06:07..
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  #2  
Old Mon 01 December 2014, 13:43
Alan_c
Just call me: Alan (#11)
 
Cape Town (Western Cape)
South Africa
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Its difficult to see, but it looks like the base rectangle (in the dxf drawing) has a radius on three corners but not on the the bottom left corner? Is the cut starting and ending at that corner?
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  #3  
Old Mon 01 December 2014, 13:45
carcan
Just call me: Carlo
 
Camparada
Italy
I think it is a problem of CV settings
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  #4  
Old Mon 01 December 2014, 14:25
renraku
Just call me: renraku
 
rome
Italy
i do not remember if the only different corner is the starting and ending, my dxf design is a simply closed rectangle, a corner is different repeated all over the Others rectangles
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  #5  
Old Mon 01 December 2014, 14:28
carcan
Just call me: Carlo
 
Camparada
Italy
Yes, but if the first corner is right, means that the CV settings at your speed do not allow to do 90 degree angles. Check the acceleration value, speed and CV settings, otherwise try to cut with a Exact Stop instead of Constant Velocity
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  #6  
Old Mon 01 December 2014, 14:39
renraku
Just call me: renraku
 
rome
Italy
thanks a lot i have to try that setting, i hope to solve this problem thanks
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  #7  
Old Tue 02 December 2014, 04:01
Robert M
Just call me: Robert
 
Lac-Brome, Qc
Canada
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Another thought.... What is your cam (or G-code generator) settings ( but before, what cam are you using?)
Any other “unusual” cut behavior has ever happened before ?
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  #8  
Old Tue 02 December 2014, 04:13
renraku
Just call me: renraku
 
rome
Italy
Vectric aspire
Now I realized this mistake, and 'small but carefully i can see it, the CNC has repeated on many rectangle the same mistake in the same corner of all rectangle
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  #9  
Old Tue 02 December 2014, 09:12
danilom
Just call me: Danilo #64
 
Novi Sad
Serbia
First corner where the toolpath starts is dead on, but the CV shortens the other corners, use the Mach3 option STOP CV ON ANGLES or make a start point anywhere else on the path except in corner
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  #10  
Old Tue 02 December 2014, 09:23
renraku
Just call me: renraku
 
rome
Italy
thanks a lot
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  #11  
Old Tue 02 December 2014, 09:59
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
Danilo,
You make a very valid point on moving the start point.
Corners = bad. Sides or sacrificial area = good.

Cheers.
Sean
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  #12  
Old Tue 02 December 2014, 13:18
danilom
Just call me: Danilo #64
 
Novi Sad
Serbia
just a bit more explanation on possible implications when moving the start point out of corner when you are doing something other than profile cut.
It may leave a mark on the start / end point so do an OVERCUT, it's possible with Vectric Aspire only if you use Lead in/out.
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  #13  
Old Wed 03 December 2014, 00:06
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
A wobble at start or end of cut is also sign of a possible loose router mounting bracket to z-slide. Or z-slide loose inside its rollers.
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  #14  
Old Wed 03 December 2014, 14:02
pblackburn
Just call me: Pete #98
 
South-Central Pennsylvania
United States of America
I have seen the "Z slide loose inside its rollers" issue before. Thought it was good until I took the spring tension off the motor mount, then it was apparent.
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  #15  
Old Wed 03 December 2014, 16:07
renraku
Just call me: renraku
 
rome
Italy
Thanks a lot i have to check it
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  #16  
Old Mon 15 December 2014, 15:32
silverdog
Just call me: Sergio #70
 
Rome
Italy
I tried the same gcode on my mechmate and the results are the same ...
I'm sure it's a "software" problem ... aspire or mach3 setting .... I do not have that problem with most of my files :-)
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