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Author Topic: Jerky Motion & Poor Quality in Curves  (Read 10230 times)

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Offline MJR

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Re: Jerky Motion & Poor Quality in Curves
« Reply #10 on: July 19, 2006, 12:11:41 AM »
What is your recomendation for this setting?
Mine is currently at +1.

Thanks.
Re: Jerky Motion & Poor Quality in Curves
« Reply #11 on: July 19, 2006, 06:41:22 AM »
This feed rate will tell Mach3 how much to round the corner... So I woudl think about 25% the max feedrate of the machine should do.
Fixing problems one post at a time ;)

www.newfangledsolutions.com
www.machsupport.com

Offline MJR

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Re: Jerky Motion & Poor Quality in Curves
« Reply #12 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
Re: Jerky Motion & Poor Quality in Curves
« Reply #13 on: July 20, 2006, 11:07:16 AM »
I have the same problem with spirals generated in mastercam.  Also it stops in each of the 4 quadrants when cutting a circle.
« Last Edit: July 23, 2006, 02:39:59 PM by mrmatt68 »
Re: Jerky Motion & Poor Quality in Curves
« Reply #14 on: July 22, 2006, 09:24:08 AM »
Could you guys please post files that are giving you trouble? and please put in a note on the lines so I can find them :)

thank you
Brian
Fixing problems one post at a time ;)

www.newfangledsolutions.com
www.machsupport.com

Offline MJR

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Re: Jerky Motion & Poor Quality in Curves
« Reply #15 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 )
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%

Not sure how to send an attachment.
Thanks.
Rusty
Re: Jerky Motion & Poor Quality in Curves
« Reply #16 on: July 23, 2006, 09:15:24 AM »
Ran good here... Could you send me your XML and I will see if I can find a problem in the settings

Thank you
Brian
Fixing problems one post at a time ;)

www.newfangledsolutions.com
www.machsupport.com

Offline MJR

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Re: Jerky Motion & Poor Quality in Curves
« Reply #17 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
Re: Jerky Motion & Poor Quality in Curves
« Reply #18 on: July 23, 2006, 01:48:56 PM »
Send it to brianb (at )newfangledsolutions.com

It is in your Mach3 directory and in called Mach3Mill.XML

I ran it at 100IPM :)
Fixing problems one post at a time ;)

www.newfangledsolutions.com
www.machsupport.com