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Author Topic: continuous motion and tangential cutting problem  (Read 6707 times)

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continuous motion and tangential cutting problem
« on: November 17, 2010, 12:30:44 PM »
hi

i use my cnc to cut with a knife with tangential motion on, and the feed rate is very fast compared to milling. what i notice is that the motion stops at each point, or code line, and then starts again, resulting in the machine shaking.

i wonder if anyone knows how to get continuous motion so that the axes move wit smooth flowing motion?

another problem i cannot solve is that for tangential knife cutting the knife will spin (A axis) in the material at what appears to be random times - it generally works fine, and only seems t do this once per cut-out shape.

many thanks.

Offline Hood

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Re: continuous motion and tangential cutting problem
« Reply #1 on: November 17, 2010, 01:32:19 PM »
Afraid I have never used Tanegential Control so not sure if CV will work or not with it but try putting a G64 at the start of your code and see if that helps.

Hood

Offline Tweakie.CNC

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Re: continuous motion and tangential cutting problem
« Reply #2 on: November 18, 2010, 03:27:36 AM »
I don't use tangential control but I do use a rotary A Axis. There were some issues between different versions of Mach and the function of 'Rot 360 Rollover and Ang Short Rot on G0' (General config page). Have you set these functions correctly ?
I believe this was all sorted a while back so it my be worth checking that you are using the latest lockdown version.

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: continuous motion and tangential cutting problem
« Reply #3 on: November 18, 2010, 05:46:30 AM »
thanks hood.  G64 doesn't appear to change anything though, still stopping on each move resulting in machine shaking a lot and moving very slowly where there are a lot of short moves such as going around a small rounded corner.  i have a vinyl cutter (plotter) for cutting vinyl lettering from film and i wonder why i cant get the same smooth flowing motion which you get on this machine.
Re: continuous motion and tangential cutting problem
« Reply #4 on: November 18, 2010, 05:48:38 AM »
thanks tweakie i haven't looked at that, all new to me so i will have to read up on it.

Offline Hood

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Re: continuous motion and tangential cutting problem
« Reply #5 on: November 18, 2010, 07:55:45 AM »
Can you attach the code you are running  please.
Hood
Re: continuous motion and tangential cutting problem
« Reply #6 on: November 18, 2010, 03:29:24 PM »
here is the g code generated by v carve (vectric) with arc fitting on, i had to cut it short though as it exceeded 2000 charcters which is the max i can send you. i couldn't see how to attach a file.  thanks for looking at this, much appreciated.

( 1-5mmtolfrommark )
( File created: Thursday, November 18, 2010 - 09:51 AM)
( for Mach2/3 from Vectric )
( Material Size)
( X= 1617.624, Y= 1690.919, Z= 15.000)
()
(Toolpaths used in this file:)
(1-5mmtolfrommark)
(Tools used in this file: )
(1 = End Mill {0.25 inch})
N95 G64
N100G00G21G17G90G40G49G80
N110G71G91.1
N120T1M06
N130 (End Mill {0.25 inch})
N140G00G43Z20.000H1
N150S12000M03
N160(Toolpath:- 1-5mmtolfrommark)
N170()
N180G94
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Offline Hood

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Re: continuous motion and tangential cutting problem
« Reply #7 on: November 18, 2010, 04:30:54 PM »
What is the lookahead set to on General config page? maybe that is fairly small and you will need to increase as there are lots of small segments there.
As for the part where the knife rotates, is that near the start i9n the G2/G3 moves, if so I think that may be the problem as I am sure tangential control only works with G1's

Hood
Re: continuous motion and tangential cutting problem
« Reply #8 on: November 23, 2010, 06:43:25 AM »
hi hood

the lookahead is 20.

yes i have noticed that when the knife spins around it is only with arc moves, not G1s.
Re: continuous motion and tangential cutting problem
« Reply #9 on: November 23, 2010, 07:23:59 AM »
hi Tweakie

both Rot 360 Rollover and Ang Short Rot on G0 are not ticked - is this correct?

version of mach i am using is R2.2 so not the latest.  i cant see any info about upgrading versions, is it straight forward ie. run the new version and it overwrites the old?

thanks for your help.