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- #Mach3 cambam endpoint of arc differs full#
- #Mach3 cambam endpoint of arc differs software#
- #Mach3 cambam endpoint of arc differs code#
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I quote "simple" because like the post Ger linked to shows there is a Planner in progress that may solve this but then I think you'll be into messing with compiling machine code and programming etc which if your not into programming isn't simple. If you're having problems with the machine running slow, like you are with the circle made of four different arcs i suggest you play around with G64 G61, P and Q parameters like has been suggested in this thread and you should be able to get it to work. The problem arises when I try and cut a curve that is made up of lots of small straight lines. When i have a curve made up of lots of different radius circles added together I dont have problem.
#Mach3 cambam endpoint of arc differs series#
However, you did say that your curve was a series of arcs of different radius so it's possible that Cambam can't actually do much optimisation into constant-radius arcs which is why it settles for a series of straight lines and lets the machine controller do any optimisation. I want to follow up the ideas already given about G64 and so on, but it may well be that even if you have a series of arcs, it's not going to make much difference as you still get slowing going from arc to arc.
#Mach3 cambam endpoint of arc differs full#
My experience with LinuxCNC cutting circles is that even with a circle made from four quarter-circle arcs (which is what Vectric VCarve seems to generate), the arcs themselves cut at full speed but LinuxCNC slows as it goes from one arc to the next, even though it's still a smooth curve. In your original post, I think you said that it was fine when you cut a circle, but not a curve made of arcs of different radius. Which you shouldn't have to do this and esp for such a basic function as CV to use a CNC machine.:thumbdown: It's also IMO why Linux CNC gets labeled with the GEEK factor and what lets Linux CNC down because the answer all too often is you have to resort to DIY programming machine code to get something fixed or working like you want it.!!.
![mach3 cambam endpoint of arc differs mach3 cambam endpoint of arc differs](https://www.practicalmachinist.com/vb/attachments/f35/22672d1273242394-arc-radius-curve-mach3-mach3.jpg)
Obviously linux as a problem with this and CV or again you need to go ask the Linux technical guys over at there forum but again I don't think you'll have much "Simple" joy because I've heard complaints from several experienced CNC users that Linux is rubbish at CV. Personally I feel your not going to get what you want because like as been said this is how 99% of Cam packages output there code for 3d surfaces. Stop and go ask over at the Cambam forum and I'm sure you'll get the correct answer. Well you know the Old saying about "ASSumeing".!!. So i assume normal would mean it makes a curve using lots of small radius. the spiral's code is lots of radius's not lots of small lines like the above For what it is worth the machine runs smooth and fast when i run an example provided which is a spiral. I put into mdi what you said and still no luck. I had already removed G64 when i copied it. It could be the same issues your experiencing.? One thing I do know thou is a very experienced CNC user who migrated to linux cnc came back to Mach3 because among other things the CV in Linux cnc was rubbish.!!. If it does then chances are Linux default parameters are set to G64.? I don't use Linux cnc so can't help you here. If your G-code doesn't contain G61 then type G64 into the MDI before running same code and see if it runs differant. You can instantly tell when machines set in G61 because it shakes the machine in corners.
#Mach3 cambam endpoint of arc differs software#
G61 is ok if your doing lots of point to point work but can be very jerky in corners, esp when the corner is made up of lots of line segments like lots of Cam software like to spit out. Mostly you'll cut in G64 mode as it gives smoother operation around corners.
![mach3 cambam endpoint of arc differs mach3 cambam endpoint of arc differs](https://docplayer.net/docs-images/34/13150268/images/62-0.png)
For this reason G64 as P & Q parameters to help with path deviation. This can give the affect of larger than required radius in square corners as the control try's to maintain commanded feed and acceleration while going around the bend but the control says hold on I can't go that fast around that bend but as to maintain the speed so it changes the radius to one it can go around at that speed.!! The affect of the radius is inversely proportional to acceleration. G64 keeps a constant feed by blending one segmant into the other, when the first segmant starts to decelerate at it's end point the next segmant starts to accelerate and the moves get blended together. G61 will pause at the end point of each Arc or line segmant that make up the curve but follow closely the shape. Check the G-code to see if it contains G61. CV can be set to either Exact stop G61 or Constant Velocity G64.