sheetcam.com Forum Index sheetcam.com
SheetCam discussion board
 
 Forum SubscriptionsForum Subscriptions    FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

rounded corners

 
Post new topic   Reply to topic    sheetcam.com Forum Index -> Problems and questions (problems @forum.sheetcam.com)
View previous topic :: View next topic  
Author Message
jeff tunks



Joined: 31 Mar 2017
Posts: 3

PostPosted: Thu Apr 20, 2017 10:16 pm    Post subject: rounded corners Reply with quote

Thanks for telling me my problem. my controller is MP 3500 - DTHC IV. What is turned on and can you give me any ideas how to make any changes so i cut square corners instead of rounded corners?
Back to top
View user's profile Send private message
WyoGreen



Joined: 07 May 2014
Posts: 123

PostPosted: Fri Apr 21, 2017 12:42 am    Post subject: Reply with quote

A couple of things you can try. You can use cut rules to slow down on the corners to about 60% of your cut speed. Where possible, you can try loop sharp corners, upper right corner of the jet cutting operations dialog.

Steve
Back to top
View user's profile Send private message
Les Newell
Site Admin


Joined: 11 May 2006
Posts: 1870

PostPosted: Fri Apr 21, 2017 10:13 am    Post subject: Reply with quote

In Mach3 you can turn off CV by going to Config->general config and setting the MotionMode to 'Exact stop'. The disadvantage of doing this is that the machine will come to a complete halt on each corner. Try leaving CV on and playing with the 'CV control' values. I never really worked out what they do so you will have to experiment a bit.

If you can increase the motor acceleration that will help a lot.
Back to top
View user's profile Send private message
PK



Joined: 10 May 2012
Posts: 353

PostPosted: Fri Apr 21, 2017 10:38 am    Post subject: Reply with quote

I don't use Mach, but use CV with my controller which probably produces the same results. I believe in a perfect world, the table would not need CV and have high acceleration settings.

But high acceleration settings with a table that can't handle it, will produce jerky results shown on the cut piece. CV attempts to compromise this. Without CV or settings in CV set too "tight" will show up in corners burnt too long as the table mechanics slow down in the corner trying to stay on line and slower acceleration causes this to show up more.

My CV settings (I assume yours, too) will have two parts. Speed and accuracy. The higher the accuracy, the slower the movement through a tight corner. If you can give up a little accuracy in an attempt to keep the torch moving closer to the programmed feed rate, you may be able to get improved cuts.

If you set the accuracy too low to keep the torch moving, a tight corner can look more like a curve. This is all outside of the Sheetcam or any gcode programmed paths.

At least this is what I have found. YMMV

Paul
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    sheetcam.com Forum Index -> Problems and questions (problems @forum.sheetcam.com) All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group