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Messages - MJR

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1
General Mach Discussion / Backlash
« on: August 06, 2006, 01:05:18 PM »
Hi All:
My home-built machine has one slight drawback.  On my Y axis I am using a chain & sprocket system.  Works very well except when the Y changes directions, I get about .015" less travel in the new direction.  If the Y moves & continues to move in the same direction I lose NO more distance, but as soon as the Y goes in the opposite direction again there seems to be a slight lag, then the Y moves which results into an average of .015" lost.
This is very noticeable when cutting a circle.  It produces a very slight out of roundness.
I have checked all the mechanical stuff & I think it is just in the fit between the chain & the drive sprocket & all the links.

How can I adjust Mach3 to correct this problem.
Please be specific with the instructions. I do not fully understand what I have read about the backlash within the documentation.
Thanks all.
Rusty

2
General Mach Discussion / Make Cuts without writing g-code
« on: August 02, 2006, 10:55:05 PM »
Hi All:
On occassion all I need to do is cut a straight line on the X or Y axis (to true up a face or for alignment purposes).
Is there a way that I can use Mach3 with out writing a g-code?
Thanks.
Rusty

3
General Mach Discussion / Re: Jerky Motion & Poor Quality in Curves
« on: July 23, 2006, 01:06:15 PM »
Thanks Brian:
What feedrate did you use?  Was it real smooth?
I do not know where to find the XML file & how do I send it.

Talk to you later.
Rusty

4
General Mach Discussion / Re: Jerky Motion & Poor Quality in Curves
« on: July 22, 2006, 09:56:10 PM »
Brian:
This is the file that seems to be the worst.  Cuts not bad at 10 inches/min & starts to get bad at 30 inches/min & vilantly jerky at 100.  Still cuts & doesn't miss a beat, but is hard on the machine.
Try it for yourself & let me know how it cuts on your machine.

( Outside Chamfer )
( Mach2/3 Postprocessor )
N20G00G21G17G90G40G49G80
N30G70
N40T1M06
N50G00G43Z1.0000H1
N60S12000M03
N70G94
N80X0.0000Y0.0000F30.0
N90G00X1.8767Y1.4232Z0.2500
N100G01Z-0.2500F20.0
N110G01X0.6186Y3.6682F30.0
N120X0.5271Y3.8583
N130X0.4584Y4.0633
N140X0.4158Y4.2790
N150X0.4014Y4.5002
N160X0.4158Y4.7215
N170X0.4584Y4.9372
N180X0.5271Y5.1422
N190X0.6186Y5.3323
N200X1.8765Y7.5770
N210X1.9744Y7.7308
N220X2.0965Y7.8808
N230X2.2438Y8.0222
N240X2.4159Y8.1493
N250X2.6111Y8.2562
N260X2.8257Y8.3375
N270X3.0544Y8.3883
N280X3.2906Y8.4056
N290X3.5268Y8.3883
N300X3.7555Y8.3375
N310X3.9701Y8.2562
N320X4.1653Y8.1493
N330X4.3375Y8.0222
N340X4.4847Y7.8808
N350X4.6068Y7.7308
N360X4.7047Y7.5770
N370X5.4377Y6.2689
N380X5.4483Y6.2530
N390X5.4614Y6.2384
N400X5.4769Y6.2257
N410X5.4943Y6.2155
N420X5.5129Y6.2082
N430X5.5321Y6.2039
N440X5.5511Y6.2025
N450X10.1131
N460X10.2919Y6.1917
N470X10.4756Y6.1575
N480X10.6599Y6.0982
N490X10.8396Y6.0127
N500X11.0092Y5.9017
N510X11.1635Y5.7674
N520X11.2979Y5.6131
N530X11.4088Y5.4434
N540X11.4943Y5.2638
N550X11.5537Y5.0795
N560X11.5878Y4.8958
N570X11.5986Y4.7170
N580Y2.0800
N590X11.5876Y1.8996
N600X11.5528Y1.7141
N610X11.4923Y1.5281
N620X11.4051Y1.3468
N630X11.2918Y1.1759
N640X11.1546Y1.0208
N650X10.9973Y0.8862
N660X10.8244Y0.7759
N670X10.6417Y0.6917
N680X10.4547Y0.6343
N690X10.2687Y0.6026
N700X10.0881Y0.5947
N710X10.0876Y0.5947
N720X10.0865Y0.5947
N730X10.0859Y0.5947
N740X3.2906
N750X3.0830Y0.6080
N760X2.8735Y0.6493
N770X2.6676Y0.7192
N780X2.4712Y0.8171
N790X2.2899Y0.9406
N800X2.1282Y1.0860
N810X1.9898Y1.2486
N820X1.8767Y1.4232
N830G01Z-0.5000F20.0
N840G01X0.6186Y3.6682F30.0
N850X0.5271Y3.8583
N860X0.4584Y4.0633
N870X0.4158Y4.2790
N880X0.4014Y4.5002
N890X0.4158Y4.7215
N900X0.4584Y4.9372
N910X0.5271Y5.1422
N920X0.6186Y5.3323
N930X1.8765Y7.5770
N940X1.9744Y7.7308
N950X2.0965Y7.8808
N960X2.2438Y8.0222
N970X2.4159Y8.1493
N980X2.6111Y8.2562
N990X2.8257Y8.3375
N1000X3.0544Y8.3883
N1010X3.2906Y8.4056
N1020X3.5268Y8.3883
N1030X3.7555Y8.3375
N1040X3.9701Y8.2562
N1050X4.1653Y8.1493
N1060X4.3375Y8.0222
N1070X4.4847Y7.8808
N1080X4.6068Y7.7308
N1090X4.7047Y7.5770
N1100X5.4377Y6.2689
N1110X5.4483Y6.2530
N1120X5.4614Y6.2384
N1130X5.4769Y6.2257
N1140X5.4943Y6.2155
N1150X5.5129Y6.2082
N1160X5.5321Y6.2039
N1170X5.5511Y6.2025
N1180X10.1131
N1190X10.2919Y6.1917
N1200X10.4756Y6.1575
N1210X10.6599Y6.0982
N1220X10.8396Y6.0127
N1230X11.0092Y5.9017
N1240X11.1635Y5.7674
N1250X11.2979Y5.6131
N1260X11.4088Y5.4434
N1270X11.4943Y5.2638
N1280X11.5537Y5.0795
N1290X11.5878Y4.8958
N1300X11.5986Y4.7170
N1310Y2.0800
N1320X11.5876Y1.8996
N1330X11.5528Y1.7141
N1340X11.4923Y1.5281
N1350X11.4051Y1.3468
N1360X11.2918Y1.1759
N1370X11.1546Y1.0208
N1380X10.9973Y0.8862
N1390X10.8244Y0.7759
N1400X10.6417Y0.6917
N1410X10.4547Y0.6343
N1420X10.2687Y0.6026
N1430X10.0881Y0.5947
N1440X10.0876Y0.5947
N1450X10.0865Y0.5947
N1460X10.0859Y0.5947
N1470X3.2906
N1480X3.0830Y0.6080
N1490X2.8735Y0.6493
N1500X2.6676Y0.7192
N1510X2.4712Y0.8171
N1520X2.2899Y0.9406
N1530X2.1282Y1.0860
N1540X1.9898Y1.2486
N1550X1.8767Y1.4232
N1560G00Z0.2500
N1570G00Z1.0000
N1580G00X0.0000Y0.0000
N1590M09
N1600M30
%

Not sure how to send an attachment.
Thanks.
Rusty

5
General Mach Discussion / Re: Toolpath Display offset
« on: July 20, 2006, 09:56:41 PM »
I had a similar problem & I was told to push/click on the Regen button, under the disply, (before the next file or rerun.  That brought back the display to be on track for the next file/cut.
Later.
Rusty

6
General Mach Discussion / Re: Jerky Motion & Poor Quality in Curves
« on: July 19, 2006, 10:44:30 PM »
I sure am glad I purchased Mach3.  Will be worth the cost.
The forum & fellow users have helped to make my introduction into the cnc world alot smoother.
I am a little overwelmed with the gratious replies.  Many thanks to all. They have allowed me to be pointed in useful directions to try & resolve this jerky problem.  Someday I will be a knowledgeable source to contribute back to this forum.

Back to the problem:
Did one simple test.  Drew a 3 inch circle in TurboCad & also drew a 3 inch circle in V-Carve Pro. Loaded the TurboCad dxf into Mach3, did the g-code conversion, then cut the circle at 100 inches/min.  Great cut, very smooth x & y movements. NO jerkiness whatsoever.  Generated the toolpath in V-Carve Pro (profile cut only), loaded the g-code into Mach3 & cut the file.   Movement of the x & y was somewhat jerky.  Within Mach3 I engaged & disengaged the CV settings (60/20).  Got the best cut with the CV settings turned off.
Result:  there is something different between how things are drawn then coded, then cut.
Eventhough the V-Carve file was a little jerky is was nowhere near how aggressively jerky my main project was.  Still no closer to resolving that issue, but here is what the difference was:
Project drawn in AutoCad 2000, saved as Version 12, loaded into V-Carve, drawing was editted slightly, toolpaths were created, files loaded into Mach3, then cut.  Tried all sort of recomendations by the forum replies with no noticable improvement.
I know that the complexities & compatability issues of programs will always play a part towards the success of any project, so with alittle help along the way a person will just have to live with some short-comings within the technolgies.

Thanks again.  All your comments were greatly appreciated.
Rusty

7
General Mach Discussion / Re: Jerky Motion & Poor Quality in Curves
« on: July 19, 2006, 12:11:41 AM »
What is your recomendation for this setting?
Mine is currently at +1.

Thanks.

8
General Mach Discussion / Re: Jerky Motion & Poor Quality in Curves
« on: July 18, 2006, 11:47:28 PM »
Thanks Brian, I will try that tomorrow.
So, why is it that I have no problems when running just Mach3 on it's own?  Can cut very fast with smooth/clean results.
What is the number below the 180?
Later.

9
General Mach Discussion / Re: Jerky Motion & Poor Quality in Curves
« on: July 18, 2006, 11:34:58 PM »
FastCote:
Thanks for that.  I seem to be getting conflicting opions about the CV settings.  I quess I will just have to experiment.
I did go into Motor Tuning & reduce me acceleration numbers.  That made some differenence to the good until I decided to up the feedrate.  Anything over 30 inches/min starts the jerking motion again.  Very eratic & extremely jerky at 100 inches/min.  This is only happening when I use V-Carve Pro, not when I use Mach3 by itself.  To get a good finish really adds to my cutting time.
Why does no one know exactly what those CV settings mean? 180 & that mysterious number below.
I am hoping that Vectric will soon solve this problem.  Is this problem only affecting Mach users or does it also affect other post processors?
Talk to you later.

Just read Brians post.
Does that mean we should change that 180 to something else?  Don't quite understand.

10
General Mach Discussion / Re: Jerky Motion & Poor Quality in Curves
« on: July 17, 2006, 09:44:28 PM »
FastCote:
I was directed by a V-Carve Pro user to look into exactly what you are talking about.  I am just waiting to get verifcation from that person to tell me if that box in question should be green & what values should be entered.
Go to this post on Vectrics forum:
http://www.vectric.com/forum/viewtopic.php?p=2694#2694
Does that make sense?
Thanks.

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