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Linear to ID/OD feed rate convertion

BCW

By BCW,
in Industrial Forum

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BCW Newbie

BCW

Posted
Posted

I don't have access to CNC's MasterCAM forums so Ill just post it here.

 

I know its a simple conversion but it would be even easier if we had this as an option after finding the linear feed to convert it to an ID or OD adjustment.

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Colin Gilchrist Proficient

Colin Gilchrist

Posted
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Can you give an example of what you are looking for in the G-code? This seems like a pretty simple Post Modification to make, but I'm having trouble understanding exactly what you want. Is this for 4th axis milling, or are you just looking to adjust the feedrate on a arc move, based on "ID or OD" cutting? Is this for Lathe or Mill?

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BCW Newbie

BCW

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What I had in mind was more like a calculator, maybe under right click options on the feed rate field. It would pop up and you could enter ID/OD size then calculate the difference from the linear feedrate previously entered.

 

 

This looks easily doable in the post processor. I'll give it a try in the next day or two and see if I can come up with some code to make it possible.

 

Assuming it is possible, what would you be willing to pay for an enhancement like this?

 

Cant pay or change post without jumping thru many hoops. Thanks though for the offer.

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Colin Gilchrist Proficient

Colin Gilchrist

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Thanks for the illustration Bobby. After doing some reading on the subject, this seems doable inside the post. No need for a dialog, probably just a Miscellaneous Integer to activate the routine for feedrate calculation adjustment.

 

  • I can get the "direction" of the cut based on "climb vs. conventional", and detect the tool swinging a "CW vs. CCW" arc.
  • Just need to calculate the Angular Velocity, Angular Acceleration, Angular Displacement, and Time.
  • Use the radius of the move vs. the radius of the cutter and the Angular values, combined with some Vector Math, and it should be able to adjust the feedrate value for each arc move being output, to maintain the equivalent "linear feed" value

 

I totally understand about the red tape issues of working in a large corporation. I can imagine that it is exponentially worse working for a government entity. Sorry to come out with a response like "what would you be willing to pay", but Post Development is one of the things that I use to feed my family...

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  • 2 weeks later...
Colin Gilchrist Proficient

Colin Gilchrist

Posted
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I debated for a while with myself about whether I should offer this as a Post Development service. Ultimately I decided against that for a couple reasons:

 

  1. The idea (request) was not originally mine. Someone was asking for an enhancement to Mastercam, and I got the idea from them in the first place. (Thanks Bobby!)
  2. It only took me a couple hours to work out the logic and debug.
  3. I like giving back to the Emastercam community, and I feel like this could benefit a bunch of people, that might not necessarily be able to pay to have it implemented.
  4. The modifications are fairly simple, so it would probably take me longer to deal with the administration of the project, than it would to add the code. (Things like dealing with Purchase Orders, and the back-and-forth communication eat up a lot of my time, which is in relatively short supply these days.)

Now, I do like helping people out as much as I can, but I've also got to balance that against having a family to feed. So I've decided that I'll request you to make a donation to my PayPal Account, if you feel like these modifications are beneficial to you. So go ahead and copy the code into your Post, try out the functionality, and if you feel like making a donation, I would appreciate it very much. But it is certainly not required. (If you do send a donation, please send it as "Friends and Family", otherwise it creates another administration headache on my part...) You can PayPal me at 'colin' AT 'eapprentice' DOT 'net.

 

OK, so what do these modifications do, exactly?

 

The idea is simply to take the Feedrate that is used when making a Linear Cut (G1), and determine if the cutter is "outside" or "inside" the geometry, when cutting an Arc motion. The original request was made for Bore and Boss style (circular) geometry, but I did some testing and it works pretty well for most of the 2D paths, although you need to be a little careful, as I'll explain below.

 

The theory behind this functionality is that when you are cutting an Internal Arc, the Centerline of the cutter is moving around an Arc that is smaller than the Edge Length. (The tangent path that the periphery of the cutter makes while Circle Milling a hole for example.)

 

  • When cutting a Straight Line move, the Angular Velocity of the cutting teeth is held constant, and is simply dependent on the programmed RPM of the cutting tool.

 

  • When you are cutting an Internal Arc, the Path Length (center of cutter) is shorter than the Edge Length. This leads to an Increase in Angular Velocity that is proportional to the size of the Arc, and the ratio between the Arc Radius and Tool Radius. This gives you a ratio (fraction), that can be used to "adjust" the Feedrate of the Arc Move, to maintain a constant Angular Velocity. Cutting an Internal Arc leads to Over Feeding of the cutting tool, resulting in a larger chip being taken than was calculated based on the programmed Linear Feedrate.

 

  • When you are cutting an External Arc, the Path Length (center of cutter) is longer than the Edge Length. This leads to a Decrease in Angular Velocity that is also proportional to the size of the Arc, and the ratio between the Arc Radius and the Tool Radius. This gives you a ratio (fraction), that can be used to "adjust" the Feedrate of the Arc Move, to maintain a constant Angular Velocity. Cutting an External Arc leads to Over Speeding of the cutting tool, which can lead to dulling (poor surface finish), and premature tool wear.

 

So my solution to this was to add logic to the Post that will calculate the Ratio of the path length and tool radius, and adjust the Feedrate for each Arc Motion. I also added some logic to check the state of the Lead In and Lead Out "Overrides" for Feedrates, and to not use the "Adjusted" values if these options are enabled. My thinking here is that if you are setting these values, then you want those specific numbers to be used, and not a fraction of those numbers. If you do not enable those Feedrate Overrides, then the logic will take that into account and simply look at the ratio of the path length vs. the tool radius, and adjust your Feedrates accordingly.

 

I also added some logic to detect a Helix Move on the 2D HST Paths, and when performing a Helix Entry, with the "Entry Speeds/Feeds" enabled, it will simply use the data you entered. If you do not Override the Feedrate on the Entry motion, then the logic will adjust the Feedrate accordingly.

 

When performing a 2D Dynamic HST path, the logic will detect when you are in "Backfeed" mode, and will not adjust the feedrates, since your tool is not in contact with the material. Be sure to set your Backfeed value to a number that is different (and larger usually) than your Cutting Feedrate.

 

Finally, there is a feature I added to use a Minimum and Maximum "Scale Factor", to have a limit for scaling the Feedrate up or down, based on External or Internal cutting. The reason I do this is that in the HST paths, you can frequently get both very small, and very large Arc Moves. This can lead to your Feedrate being either extremely slow, or ridiculously fast, so I give you two variables at the top of the post that you can set to allow the min/max adjustment to the nominal linear feedrate.

 

The function is activated (turned on) with a Miscellaneous Integer. (I used 'mi10$', but you could set this up for another MI value if that one is already used in your post.

 

I would appreciate feedback on how to improve the functionality if you find that something can be improved, but I also have to give a few warnings to go along with this "free" code.

 

  • You are responsible for setting proper feedrates for your cutter and material, based on your experience. This Post Logic simply scales the Feedrate values that are output when cutting arcs. I will not be held liable for broken cutters or scrapping your parts, so use at your own risk (or reward).
  • This logic does not distinguish between "internal or external" cutting changes in the middle of the path. There is just a simple switch to turn on Internal or External cutting mode. I have tested the output with several different Contour, 2D Dynamic HST, and Circle Mill configurations, and it has worked really well for these simple geometry cases. The original request was for Bore/Boss style geometry, and this logic works great on that kind of cutting.
  • I did test with 2D HST, and as long as your cutting is completely "internal" or completely "external", then you should be able to apply this logic to other paths as well, but keep in mind that you need to carefully check the output when trying to apply this to another path.
  • This logic only adjusts Arc Motions. All the Linear motion will commence at the programmed Feedrate.
  • I set some "default" values for the Min/Max Scale Factor, you may discover through testing that you can safely increase these values to allow a bigger adjustment range, or the opposite may be true; you may need to lower these scaling values.

 

Ok, now that we've got the warning out of the way, let's get on with the implementation details...

 

1 - Near the top of the post, in the General Settings, add the Scale Variables:

# --------------------------------------------------------------------------
# General Output Settings
# --------------------------------------------------------------------------
fr_min_scale : 0.5   #Scale Factor for Arc Feedrate Adjustment
fr_max_scale : 1.5   #Scale Factor for Arc Feedrate Adjustment
                     #Value is Max % of adjustment + or - from programmed feedrate
                     #Used to keep FR adjustment in range of programmed feedrate
                     #NOTE: Very Small or Very Large Arcs in HST Paths can cause
                     #      extreme FR values to be calculated in Arc FR Adjustment,
                     #      that is the reason for using the Scale Factors
                     #DEFAULT VALUES:
                     # fr_min_scale : 0.5 = Scale Down max by 50% of programmed FR
                     # fr_max_scale : 1.5 = Scale Up   max by 50% of programmed FR

2 - I modified the Feedrate Format Statement to increase the precision. You'll need to make sure this setting matches the precision on your actual control unit. Many modern controls allow 4 or more decimal places for the Feedrate value in Inch mode, but I'd recommend checking your machine manual.

fs2 15  0.3 0.2      #Decimal, absolute, 3/2 place (feedrate)

3 - Between 'feed' and 'dwell$' variables in the Format Assignment section, I added the following variables:

fmt  "F" 15 feed        #Feedrate
fmt  ""  4  back_feed   #Back Feedrate for HST Ops (suppress Arc Feed Adjustment)
fmt  "F" 15 lead_in_fr  #Get Lead In FR Value
fmt  "F" 4  lead_in_on  #State of Lead In FR Checkbox
fmt  "F" 15 lead_out_fr #Get Lead In FR Value
fmt  "F" 4  lead_out_on #State of Lead In FR Checkbox
fmt  "F" 15 hst_fr_val  #Get HST FR Override Val
fmt  "F" 4  hst_fr_box  #State of HST FR Override Checkbox
fmt  "R" 1  edge_rad    #Calculated Edge Radius (tangent contact radius of cut)
fmt  ""  2  arc_max_fr  #Max Arc FR
fmt  ""  2  arc_min_fr  #Min Arc FR
fmt  ""  1  raw_arcrad  #Raw Arc Rad - for calc
fmt  ""  1  raw_tlrad   #Raw Tl Rad - for calc
fmt  ""  1  adj_arcrad  #Adjusted Arc Radius for calc
fmt  ""  1  adj_tlrad   #Adjusted Tl Radius with tolerance applied
tol_tlrad : 1.02        #tlrad tolerance 2% (use when arcrad is close to tlrad)
fmt  "P" 11 dwell$      #Dwell

4 - Modify the 'pcirout' post block. Note that this example is from the Generic Fanuc 3X Mill Post. So the normal "output lines" may not match your Post, if you are modifying a 4X post. (The bottom two lines may be different. Do not copy that part of the code, just use your existing output lines, and copy/paste the code above it.)

pcirout         #Output to NC of circular interpolation
      #Feedrate Adjustment for Internal (mi10$=1) or External (mi10$=2) Arcs
      if feed <> back_feed,
        [
        arc_max_fr = fr_pos$ * fr_max_scale #Get max Arc FR
        arc_min_fr = fr_pos$ * fr_min_scale #Get min Arc FR
        raw_arcrad = arcrad$                #Capture arcrad - format 1 for better calc
        raw_tlrad  = tlrad$                 #Capture tlrad  - format 1 for better calc
        adj_tlrad  = tlrad$ * tol_tlrad     #Adjust tlrad by 2% for safety
        if cutpos2$ = two | cutpos2$ = three, #Calculation "in-cut"
          [
          if mi10$ = 1,
            [
            edge_rad = raw_arcrad + raw_tlrad #Internal, add
            feed = feed * (raw_arcrad / edge_rad)
            ]
          if mi10$ = 2,
            [
            edge_rad = abs(raw_arcrad - raw_tlrad) #External, sub
            if fmtrnd(edge_rad) = zero, edge_rad = abs(raw_arcrad - adj_tlrad)
            feed = feed * (raw_arcrad / edge_rad) #else,
            ]
          ]
        if cutpos2$ = zero,
          [
          if hst_fr_box, feed = hst_fr_val  #If HST FR is ON, override calculated Feed
          else,
            [
            edge_rad = raw_arcrad + raw_tlrad #Internal, add
            feed = feed * (raw_arcrad / edge_rad)
            ]
          ]
        if cutpos2$ = one,
          [
          if lead_in_on, feed = lead_in_fr  #If Lead In FR is ON, override calculated Feed
          else,
            [
            edge_rad = raw_arcrad + raw_tlrad #Internal, add
            feed = feed * (raw_arcrad / edge_rad)
            ]
          ]
        if cutpos2$ = four,
          [
          if lead_out_on, feed = lead_out_fr #If Lead Out FR is ON, override calculated Feed
          else,
            [
            edge_rad = raw_arcrad + raw_tlrad #Internal, add
            feed = feed * (raw_arcrad / edge_rad)
            ]
          ]
        if feed > arc_max_fr, feed = arc_max_fr
        if feed < arc_min_fr, feed = arc_min_fr
        ]
      pcan1, pbld, n$, sgplane, sgcode, sgabsinc, pccdia,
        pxout, pyout, pzout, parc, feed, strcantext, pscool,$

5 - Add these lines to 'pparameter$' to capture the settings from inside the Mastercam dialog boxes:

        if prmcode$ = 12718, back_feed = rpar(sparameter$, 1)   #Get back feedrate value
        if prmcode$ = 15485, lead_in_fr = rpar(sparameter$, 1)  #Get Lead In FR Value
        if prmcode$ = 15486, lead_in_on = rpar(sparameter$, 1)  #State of Lead In FR Checkbox
        if prmcode$ = 15487, lead_out_fr = rpar(sparameter$, 1) #Get Lead In FR Value
        if prmcode$ = 15488, lead_out_on = rpar(sparameter$, 1) #State of Lead In FR Checkbox
        if prmcode$ = 40219, hst_fr_val = rpar(sparameter$, 1)  #Get Entry FR Override Value
        if prmcode$ = 40227, hst_fr_box = rpar(sparameter$, 1)  #State of Entry FR Override

6 - Modify any of the "misc integer" Post Text Sections at the very bottom of the post, to name the 'mi10$' variable. If you want to use a different MI value, feel free, but make sure you modify the code in 'pcirout' to use that MI variable:

[misc integers]
1. "Work Coordinates [0-1=G92, 2=G54's]"//2
2. "Absolute/Incremental, top level [0=ABS, 1=INC]"
3. "Reference Return [0=G28, 1=G30]"
10. "Adj. Arc FR? [0=No, 1=Int, 2=Ext]"
[simple drill]

Ok, that's about all that is required to get the Arc Adjustment. Keep in mind that it works by using your Programmed Linear Feedrate value, so you will ultimately need to adjust that number to "dial in" the proper speed/feed range. The Adjust Arc Code will just handle the G2/G3 adjustment to the feed values.

 

If you find this code helpful, and you want to make a donation I'd certainly appreciate it.

 

Thanks and Happy coding!

 

-Colin

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Colin Gilchrist Proficient

Colin Gilchrist

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Some sample NC Code:

%
O0000(T)
(DATE=DD-MM-YY - 24-11-16 TIME=HH:MM - 05:19)
(MATERIAL - ALUMINUM INCH - 2024)
( T239 |  1/2 FLAT ENDMILL | H239 )
N100 G20
N102 G0 G17 G40 G49 G80 G90
( INTERNAL ARC )
N104 T239 M6
N106 G0 G90 G54 X.3485 Y.105 S2292 M3
N108 G43 H239 Z.25
N110 Z.2
N112 G1 Z0. F20.
N114 Y-.02 F22.222
N116 G3 X.3685 Y0. I0. J.02
N118 I-.3685 J0. F32.769
N120 G1 X.5185 F55.
N122 G3 I-.5185 J0. F37.108
N124 G1 X.6685 F55.
N126 G3 I-.6685 J0. F40.03
N128 G1 X.8185 F55.
N130 G3 I-.8185 J0. F42.131
N132 G1 X.9685 F55.
N134 G3 I-.9685 J0. F43.716
N136 G1 X.9935 F55.
N138 G3 I-.9935 J0. F43.943
N140 X.9735 Y.02 I-.02 J0. F33.333
N142 G1 Y-.105
N144 Z.2 F200.
N146 G0 Z.25
( EXTERNAL ARC )
N148 X3.1185 Y.5
N150 Z.2
N152 G1 Z0. F20.
N154 X2.6185 F44.444
N156 G3 X2.1185 Y0. I0. J-.5
N158 G2 I-2.1185 J0. F62.359
N160 G1 X1.9685 F55.
N162 G2 I-1.9685 J0. F63.001
N164 G1 X1.8185 F55.
N166 G2 I-1.8185 J0. F63.766
N168 G1 X1.6685 F55.
N170 G2 I-1.6685 J0. F64.693
N172 G1 X1.5185 F55.
N174 G2 I-1.5185 J0. F65.84
N176 G1 X1.4935 F55.
N178 G2 I-1.4935 J0. F66.057
N180 G3 X1.9935 Y-.5 I.5 J0. F11.111
N182 G1 X2.4935
N184 Z.2 F200.
N186 G0 Z.25
( EXTERNAL_HST_CIRCLE )
N188 S1069 M3
N190 X-2.6051 Y-.2772
N192 Z.1
N194 G1 Z0. F6.418
N196 X-2.503 Y-.0453 F109.
N198 G3 X-2.4927 Y.0073 I-.1278 J.0523 F54.5
N200 G2 X-2.381 Y.5941 I2.4665 J-.1654 F121.264
N202 X-1.1196 Y2.0215 I2.2624 J-.7283 F121.813
N204 X-.4973 Y2.2279 I1.336 J-2.9875 F118.015
N206 X1.0106 Y2.0439 I.4901 J-2.2546 F122.246
N208 X2.2801 Y-.0035 I-1.0106 J-2.0439 F122.423
N210 X1.0043 Y-2.047 I-2.2801 J.0035
N212 X-1.3926 Y-1.8054 I-1.0043 J2.047
N214 X-2.2704 Y-.2048 I1.3892 J1.8028 F122.45
N216 X-2.2004 Y.4492 I1.9322 J.1239 F125.161
N218 X-.9246 Y1.8733 I2.083 J-.5825 F123.245
N220 X-.2656 Y2.0509 I.9704 J-2.2892 F121.185
N222 X1.3421 Y1.5698 I.2575 J-2.0662 F123.873
N224 X1.928 Y-.7403 I-1.3421 J-1.5698 F124.011
N226 X-.0533 Y-2.0646 I-1.928 J.7403 F124.012
N228 X-1.9637 Y-.6398 I.0533 J2.0646 F124.011
N230 X-2.0563 Y-.0904 I1.6707 J.5641 F127.006
N232 X-1.8445 Y.7652 I1.8431 J-.0023 F126.105
N234 X-.9214 Y1.6409 I1.7299 J-.8991 F125.033
N236 X-.1909 Y1.8429 I.9416 J-1.9832 F123.008
N238 X1.1229 Y1.4686 I.1783 J-1.8672 F125.762
N240 X1.6587 Y-.8163 I-1.123 J-1.4686 F126.044
N242 X-.4788 Y-1.7856 I-1.6587 J.8163 F126.045
N244 X-1.8022 Y-.4071 I.478 J1.7835 F126.069
N246 X-1.7277 Y.4933 I1.5418 J.3256 F129.554
N248 X-.9592 Y1.378 I1.6112 J-.6234 F127.442
N250 X-.1652 Y1.6277 I.9673 J-1.6885 F125.068
N252 X.9212 Y1.3447 I.1467 J-1.6636 F128.189
N254 X1.3531 Y-.9085 I-.9215 J-1.3446 F128.745
N256 X-.8958 Y-1.3615 I-1.3531 J.9085 F128.749
N258 X-1.5623 Y-.4596 I.8898 J1.3547 F128.879
N260 X-1.4805 Y.5093 I1.3384 J.375 F132.905
N262 X-1.0924 Y1.0184 I1.3568 J-.6319 F130.857
N264 X1.1255 Y.9818 I1.0924 J-1.0184 F130.914
N266 X.8637 Y-1.2184 I-1.1255 J-.9818 F130.913
N268 X-1.3009 Y-.7337 I-.8637 J1.2184 F130.914
N270 X-1.101 Y1.0091 I1.3009 J.7337 F130.913
N272 G1 X-1.0871 Y1.0278 Z.0021 F109.
N274 X-1.0774 Y1.049 Z.0043
N276 X-1.0573 Y1.1081 Z.01
N278 G0 Z.25
( INTERNAL_HST_CIRCLE )
N280 X-1.1599 Y-.0897
N282 Z.1
N284 G1 Z0. F6.418
N286 X-1.1917 Y-.3411 F123.
N288 G3 X-1.1851 Y-.3998 I.1354 J-.0144 F61.5
N290 X-.6811 Y-1.0963 I1.2186 J.3512 F102.746
N292 X.5182 Y-1.2439 I.7435 J1.0947 F103.455
N294 X.9509 Y-.9693 I-.4194 J1.1387 F101.988
N296 X.867 Y1.0461 I-.9498 J.9699 F103.871
N298 X-1.13 Y.7544 I-.867 J-1.0463 F103.887
N300 X-1.3275 Y-.2925 I1.1383 J-.7569 F103.983
N302 X-.7231 Y-1.2004 I1.3824 J.2653 F104.449
N304 X.6922 Y-1.2876 I.7838 J1.191 F104.65
N306 X1.3196 Y-.6452 I-.6498 J1.2621 F104.582
N308 X.6589 Y1.313 I-1.3193 J.6454 F105.109
N310 X-1.3061 Y.6724 I-.6589 J-1.313 F105.112
N312 X-1.45 Y-.2421 I1.3213 J-.6765 F105.271
N314 X-.9597 Y-1.1572 I1.5183 J.2246 F105.771
N316 X.7363 Y-1.3889 I1.02 J1.1432 F105.745
N318 X1.4474 Y-.6338 I-.693 J1.3651 F105.734
N320 X.7902 Y1.3686 I-1.447 J.6341 F106.195
N322 X-1.2727 Y.9368 I-.7902 J-1.3686 F106.2
N324 X-1.5663 Y-.2209 I1.2847 J-.9418 F106.315
N326 X-.9945 Y-1.2748 I1.6351 J.2051 F106.798
N328 X.7856 Y-1.4887 I1.0542 J1.2592 F106.749
N330 X1.5673 Y-.6381 I-.742 J1.4663 F106.759
N332 X.937 Y1.4095 I-1.5667 J.6385 F107.164
N334 X-1.1952 Y1.1983 I-.937 J-1.4095 F107.17
N336 X-1.6846 Y-.1776 I1.2036 J-1.2031 F107.245
N338 X-1.0093 Y-1.4071 I1.7519 J.162 F107.697
N340 X.8145 Y-1.5995 I1.0687 J1.3904 F107.653
N342 X1.6783 Y-.6642 I-.77 J1.5777 F107.668
N344 X1.1016 Y1.4304 I-1.6775 J.6648 F108.032
N346 X-1.0711 Y1.4533 I-1.1016 J-1.4304 F108.04
N348 X-1.8022 Y-.1302 I1.0769 J-1.4576 F108.089
N350 X-1.0257 Y-1.536 I1.8692 J.1151 F108.514
N352 X.8601 Y-1.703 I1.0847 J1.5171 F108.461
N354 X1.8045 Y-.6516 I-.8162 J1.683 F108.499
N356 X1.232 Y1.4713 I-1.8036 J.6522 F108.816
N358 X-.9587 Y1.6623 I-1.232 J-1.4713 F108.823
N360 X-1.918 Y-.0978 I.9634 J-1.6665 F108.862
N362 X-1.0086 Y-1.685 I1.9836 J.0825 F109.244
N364 X-.0872 Y-1.9916 I1.0638 J1.6592 F109.155
N366 X1.8654 Y-.7032 I.0872 J1.9916 F109.294
N368 X1.2541 Y1.5496 I-1.8654 J.7032
N370 X-1.0819 Y1.6744 I-1.2541 J-1.5496
N372 X-1.9281 Y-.5066 I1.0819 J-1.6744
N374 X-.1191 Y-1.9899 I1.9281 J.5066
N376 G1 X-.0958 Y-1.9889 Z.0018 F123.
N378 X-.0733 Y-1.9831 Z.0037
N380 X.0016 Y-1.9554 Z.01
N382 G0 Z.25
( INTERNAL_HST )
N384 X-7.3883 Y-.6883 Z.625
N386 G3 X-7.1917 Y-.7838 Z.6171 I.1966 J.1545 F54.505
N388 X-6.9417 Y-.5338 Z.6034 I0. J.25 F54.5
N390 X-7.1917 Y-.2838 Z.5897 I-.25 J0.
N392 X-7.4417 Y-.5338 Z.576 I0. J-.25
N394 X-7.1917 Y-.7838 Z.5622 I.25 J0.
N396 X-6.9417 Y-.5338 Z.5485 I0. J.25
N398 X-7.1917 Y-.2838 Z.5348 I-.25 J0.
N400 X-7.4417 Y-.5338 Z.5211 I0. J-.25
N402 X-7.1917 Y-.7838 Z.5074 I.25 J0.
N404 X-6.9417 Y-.5338 Z.4937 I0. J.25
N406 X-7.1917 Y-.2838 Z.48 I-.25 J0.
N408 X-7.4417 Y-.5338 Z.4663 I0. J-.25
N410 X-7.1917 Y-.7838 Z.4525 I.25 J0.
N412 X-6.9417 Y-.5338 Z.4388 I0. J.25
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N1770 X-3.8879 Y2.0552 Z.0075
N1772 X-3.8707 Y2.0646 Z.0087
N1774 X-3.8553 Y2.077 Z.01
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%
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Guest

Guest

Posted
Posted

I would LOVE to see this.

 

While we are wishing for pie in the sky things. I'd love to see the high speed tool paths use Tool Engagement Angle instead of radial engagement step over.

 

Volumill owns that patent. You'll NEVER see that.

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Sticky Newbie

Sticky

Posted
Posted

Volumill owns that patent. You'll NEVER see that.

 

It's called licensing.

 

That aside, I think it's Truemill that has the patent on using engagement angle. IIRC Volumill adjusts the feedrate to maintain chip thickness, but that doesn't control the engagement angle of the cut.

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Watcher Newbie

Watcher

Posted
Posted

Volumill owns that patent. You'll NEVER see that.

Volumill was born as Surfcam TrueMilll and then the mathematicians who created it left Surfcam and improved the algorithm after forming a new company called Celeritive. Everybody knows that so I'm not bringing anything new.

 

Surfcam sued Celeritive and the two companies settled out of court.

 

Who bought Surfcam? Edgecam Waveform was crap before the acquisition of Surfcam IP... It's great now... And guess who's got Waveform too in 2016?

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Guest

Posted
Posted

I should have said you'll never see that until Mastercam ponies up some cash. I don't see that happening. They've invested WAY too much in the engine they've got now. The time for this was back around X5 IIRC.

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Newbeeee™ Community Regular

Newbeeee™

Posted
Posted

Realistically in practical/real terms, what is the difference between what Sticky asked for and what mcam does now?

What we have (in mcam) crucifies the old ways of cutting in a lot of applications. So how much of a gain (cycle time reduction or tool life or?) would be gained with this other technology? 

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Watcher Newbie

Watcher

Posted
Posted

I should have said you'll never see that until Mastercam ponies up some cash. I don't see that happening. They've invested WAY too much in the engine they've got now. The time for this was back around X5 IIRC.

True dat.

 

And MC already went this path (Volumill licensing) and dropped it to favor their own technology, which has come a long way and it is mature now.

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