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Messages - jack1234

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1
hi mike

i was going to try your suggestions when i accidentally found the solution; i turned off the tangential control and got perfectly smooth high speed motion. however, i had to drag the knife instead to get it to face to the direction of cutting by disconnecting the A axis motor (this turns the knife) and positioning the knife behind the axis about which it rotates. this works fine provided  i have radius corners to go around.

i will give your suggestions a try though since ideally i need tangential mode on.

thanks for your help, and to everyone else who has replied.

2
here it is

3
hi again

i thought i would try a simple test to see if i really am in constant velocity mode by running this g code:

g0x0y0
g0x100
g0x200
g0x300
g0x400
g0x500
g0x0y0

simply moving in a straight line but in stages. when i ran the code the machine stopped for each point or line of code and did not run at constantly velocity.

i added g64 at the beginning but that didn't change anything.  so am i not in constant velocity mode? I don't understand!!

4
CV Dist Tolerance is set at 180

Stop CV on angles > is on zero, and not ticked.

i have ticked this now and set to 90 but no improvement. i also tried bigger values for CV Dist Tolerance but again no change, machine still goes very slowly on a curve as it goes through the many small points and shakes violently.

5
2000 causes errors - only part of the file was cut and there were some strange movements added!  tried 200 but this didnt help.

i went down the route of trying to use arcs to solve the problem and get faster smoother motion, but as we know got another problem with the A axis spinning in the material.  i am amazed that tangential cutting is not designed to work with arcs since knife cutting needs to be high speed, and the only way to get high speed is with arcs unless you are only cutting straight lines.  do you think it is worth me experiomenting or are you certina thta arcs and tangential mode do not work?  i can cut without the problem of the knife spinnign on axis for most of the job but it seems to occur at least once apparently at random.

6
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.

7
hi hood

the lookahead is 20.

yes i have noticed that when the knife spins around it is only with arc moves, not G1s.

8
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
N190X0.000Y0.000F10000.0
N200G00X321.676Y145.407Z6.000
N210G1Z-15.000F10000.0
N220G2X309.638Y187.939I22.272J29.273
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N4670G1X1058.068Y897.796
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N4690G1X1064.535Y896.513
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N4730G1X1078.407Y894.160
N4740G1X1082.069Y893.616
N4750G1X1085.808Y893.091
N4760G1X1089.625Y892.584
N4770G1X1093.518Y892.094
N4780G1X1097.488Y891.623
N4790G1X1101.535Y891.170
N4800G1X1105.658Y890.735
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N4830G1X1118.484Y889.539
N4840G1X1122.911Y889.177
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N4880G1X1140.183Y887.448
N4890G1X1144.465Y886.905
N4900G1X1148.732Y886.318
N4910G1X1152.984Y885.686
N4920G1X1157.222Y885.010
N4930G1X1161.443Y884.291
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N4950G1X1169.839Y882.720
N4960G1X1174.012Y881.868
N4970G1X1178.170Y880.973
N4980G1X1182.310Y880.034
N4990G1X1186.434Y879.051
N5000G1X1190.541Y878.025
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N5120G1X1238.411Y862.324
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9
thanks tweakie i haven't looked at that, all new to me so i will have to read up on it.

10
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.

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