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IndustryArena Forum > CAM Software > Uncategorised CAM Discussion > new to cnc, need help with meshcam
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  1. #21
    Join Date
    Aug 2018
    Posts
    18

    Re: new to cnc, need help with meshcam

    Quote Originally Posted by stevensturgis View Post
    It sounds like your g code and mach3 set ups are not both in mm or in inches.The cnc must be set up to one or the other at the start of loading mach3 for the motor travel set up. you cant change g code by using select native units. under configuration tab. That is for setting motor controls for the cnc only.
    In mesh cam set zero to top of stock. use the real thickness of the stock you will use. set the mm or inches in the mesh cam tab marked define stock this should be set to what you what to work in mm or inches. mesh cam will set the g code to mm or inches by g code commands for mach3.automatically

    The tool zero must also match the units your working in i think this is the problem. you can edit the tool zero text in windows note pad the thickness of your plate is set in this code change it to the thickness of your zero plate.

    also. g70 is inches and g71 is mm. g 20 or g21 will set mach3 to the working units.look at the g code and see what mesh cam is using

    . if you zero the tool and then hit go to zero in mach3 the tool should go to the top of your stock. if it dosent the tool zero code is wrong. or there is a tool offset being used tool offsets are set in the native units you picked when loading mach3. to view hit config tab then tool table.

    In mach3 hit the tab operator than edit text bottom the screen will blink then hit tool zero button this will bring up the code its using so you can compare them. there is also a tool retract height in this code.

    sample code only for reference or comparing to yours.

    CurrentFeed = GetOemDRO(818) 'Get the current feedrate to return to later
    CurrentAbsInc = GetOemLED(48) 'Get the current G90/G91 state
    CurrentGmode = GetOemDRO(819) 'Get the current G0/G1 state


    If GetOemLed (825)=0 Then 'Check to see if the probe is already grounded or faulty
    DoOEMButton (1010) 'zero the Z axis so the probe move will start from here
    Code "G4 P3" ' this delay gives me time to get from computer to hold probe in place
    Code "G90 G31Z-4. F4" 'probing move, can set the feed rate here as well as how far to move
    While IsMoving() 'wait while it happens
    Wend
    ZProbePos = GetVar(2002) 'get the exact point the probe was hit
    Code "G0 Z" &ZProbePos 'go back to that point, always a very small amount of overrun
    While IsMoving ()
    Wend
    Call SetDro (2, .246) ' change .060 to your plate thickness and then adjust for final accuracy
    Sleep 200 'Pause for Dro to update.
    Code "G1 Z1. F50" 'put the Z retract height you want here, must be greater than the touch plate thickness
    While IsMoving ()
    Wend
    Code "(Z axis is now zeroed)" 'puts this message in the status bar
    Code "F" &CurrentFeed 'Returns to prior feed rate
    Else
    Code "(Z-Plate is grounded, check connection and try again)" 'this goes in the status bar if applicable
    End If
    If CurrentAbsInc = 0 Then 'if G91 was in effect before then return to it
    Code "G91"
    End If
    If CurrentGMode = 0 Then 'if G0 was in effect before then return to it
    Code "G0"
    End If
    this is a problem, im trying to cut it out of mdf as a practice but if i set the mdf thickness in 'define stock' which is 36mm, then i go to 'program zero' and hit 'top of stock' it says z 18.813 mm

    so it wants to start half way through my material?

  2. #22
    Join Date
    Aug 2018
    Posts
    18

    Re: new to cnc, need help with meshcam

    the machine / mach 3 runs in mm. im using meshcam in mm...still i need to work out how it can start at the top of the stock

  3. #23
    Join Date
    Aug 2018
    Posts
    18

    Re: new to cnc, need help with meshcam

    so i remade the toolpath in meshcam using MM only. yet the output file still says G20? inches?

    the stl file was made in inches, does that matter? how can i fix this?

    (STOCK/BLOCK, 11.875, 6.301, 0.079, -0.000, -0.000, 0.079)
    G20G64G17
    G90
    (TOOL/MILL,0.1969,0,0.5906,0.0)
    M6 T1
    M3 S5000
    G0X0.0000Y0.0000Z0.1000
    (Parallel Rough)
    (Roughing Level Depth: -0.998)
    G0X10.5253Y4.7933
    G1A0.0000Z-0.0068F0.0
    G1F0.2
    X10.4877Y4.7853
    X10.4539Y4.7788
    X10.4237Y4.7737
    X10.4467Y4.7581
    X10.4821Y4.7325
    X10.5253Y4.6992
    Y4.7933
    X10.5208Y4.8325
    X10.4803Y4.8240
    X10.4465Y4.8175
    X10.4132Y4.8119
    X10.3776Y4.8067
    X10.3301Y4.8007
    X10.3108Y4.7987
    X10.3577Y4.7698
    X10.3910Y4.7484
    X10.4236Y4.7262
    X10.4591Y4.7006
    X10.4947Y4.6733
    X10.5295Y4.6452
    X10.5646Y4.6153
    Y4.8419
    X10.5410Y4.8366
    X10.5208Y4.8325
    X10.5130Y4.8711
    X10.4722Y4.8625
    X10.4399Y4.8563
    X10.4075Y4.8509
    X10.3719Y4.8457
    X10.3252Y4.8398
    X10.2783Y4.8351
    X10.2604Y4.8337
    X10.1791Y4.8291
    X10.2042Y4.8158
    X10.2268Y4.8032
    X10.2575Y4.7853
    X10.3371Y4.7363
    X10.3697Y4.7153
    X10.4006Y4.6942
    X10.4360Y4.6687
    X10.4699Y4.6427
    X10.5041Y4.6151
    X10.5334Y4.5904
    X10.5949Y4.5361
    X10.6040Y4.5276
    Y4.8921
    X10.5632Y4.8819
    X10.5332Y4.8752
    X10.5130Y4.8711
    X10.5051Y4.9097
    X10.4648Y4.9012
    X10.4334Y4.8952
    X10.4018Y4.8898
    X10.3670Y4.8847
    X10.3203Y4.8789
    X10.2753Y4.8743
    X10.2582Y4.8730
    X10.1814Y4.8686
    X10.1430Y4.8673
    X10.1030Y4.8668
    X10.0593Y4.8674
    X9.9925Y4.8691
    X10.0454Y4.8477
    X10.0821Y4.8320
    X10.1182Y4.8154
    X10.1436Y4.8031
    X10.1651Y4.7920
    X10.1856Y4.7811
    X10.2077Y4.7688
    X10.2369Y4.7518
    X10.3158Y4.7032
    X10.3475Y4.6827
    X10.3776Y4.6623
    X10.4121Y4.6374
    X10.4452Y4.6121
    X10.4794Y4.5845
    X10.5073Y4.5609
    X10.5688Y4.5066
    X10.6045Y4.4734
    X10.6290Y4.4492
    X10.6434Y4.4342
    Y4.9442
    X10.6164Y4.9362
    X10.5852Y4.9278
    X10.5539Y4.9202
    X10.5253Y4.9138
    X10.5051Y4.9097
    X10.4972Y4.9483
    X10.4884Y4.9466
    X10.4566Y4.9397
    X10.4260Y4.9338
    X10.3961Y4.9288
    X10.3621Y4.9238
    X10.3161Y4.9180
    X10.2722Y4.9136
    X10.2559Y4.9123
    X10.1791Y4.9079
    X10.1417Y4.9067
    X10.1035Y4.9062
    X10.0598Y4.9068
    X9.7099Y4.9150
    X9.7323Y4.9101
    X9.7907Y4.8959
    X9.8232Y4.8870
    X9.8480Y4.8797
    X9.8722Y4.8720
    X9.8979Y4.8633
    X9.9229Y4.8543
    X9.9468Y4.8451
    X10.0307Y4.8112
    X10.0657Y4.7962
    X10.1010Y4.7800
    X10.1263Y4.7677
    X10.1665Y4.7467
    X10.1885Y4.7344
    X10.2170Y4.7178
    X10.2951Y4.6697
    X10.3254Y4.6501
    X10.3546Y4.6303
    X10.3882Y4.6061
    X10.4204Y4.5815
    X10.4540Y4.5544
    X10.4813Y4.5314
    X10.5420Y4.4778
    X10.5770Y4.4452
    X10.6012Y4.4213
    X10.6187Y4.4031
    X10.6493Y4.3700
    X10.6827Y4.3317
    Y4.9983
    X10.6402Y4.9843
    X10.6062Y4.9742
    X10.5750Y4.9659
    X10.5445Y4.9584
    X10.5174Y4.9524
    X10.4972Y4.9483
    X10.4894Y4.9868
    X10.4804Y4.9852
    X10.4485Y4.9782
    X10.4186Y4.9725
    X10.3896Y4.9676
    X10.3564Y4.9627
    X10.3120Y4.9572
    X10.2827Y4.9541
    X10.2536Y4.9516
    X10.1778Y4.9472
    X10.1412Y4.9460
    X10.1040Y4.9456
    X10.0611Y4.9461
    X9.5009Y4.9593
    X8.5953Y4.9808
    X7.8010Y4.9993
    X6.2662Y5.0358
    X5.6149
    X4.8547Y5.0177
    X4.0612Y4.9993
    X2.5366Y4.9630
    X2.1212Y4.9536
    X1.8364Y4.9467
    X1.7786Y4.9459
    X1.7501Y4.9459
    X1.7348Y4.9460
    X1.6792Y4.9480
    X1.6265Y4.9513
    X1.5695Y4.9564
    X1.5473Y4.9587
    X1.5206Y4.9621
    X1.4854Y4.9674
    X1.4481Y4.9740
    X1.4071Y4.9825
    X1.3371Y4.9987

  4. #24
    Join Date
    Jan 2018
    Posts
    16

    Re: new to cnc, need help with meshcam

    The z dro needs to read 0 when you hit go to zero. make sure that you are not in machine coords the lite should be off. Go to config homing limits and make sure z is set to auto zero {checked}.
    in mesh cam when in define stock do the numbers change when you hit inches and change when you hit mm ?

    send the auto tool zero to me it may not be setting zero when it runs or has a built in tool offset.

    what do you wish to work in mm or inches

  5. #25
    Join Date
    Mar 2003
    Posts
    35538

    Re: new to cnc, need help with meshcam

    You need to scale the stl by 25.4x when you bring it into MeshCAM, and make sure the units are all in mm's when working in MeshCAM.
    You may need to reset the default settings in MeshCAM to mm's.

    But you really shouldn't need to do this. If Mach3 is set up in mm's, loading G -code with a G20 should run correctly, as Mach3 will scale the code.

    I still think it's a Mach3 setup issue, and nothing is wrong with the g-code.
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  6. #26
    Join Date
    Jan 2018
    Posts
    16

    Re: new to cnc, need help with meshcam

    this code is in inches mesh cam is writing code in inches in this chase. not mm
    use inch measurements when you define stock in mesh cam not 36mm but 1.41732283 inches 1 inch =25.4 mm The stock is probably not 1.41732283 inches thick your probably entering the wrong size thickness.
    the code says the stock is .079 thick that's just over 1/16 of an inch. .0625 ?

    in mesh cam the program will make the change to mm or inches by selecting the dot in define stock you don't enter new numbers.

    before the job starts all the dro should read 0 {X Y Z} and the tool should be where you want to start cutting.
    after you have the tool where you want to start cutting hit regen tool path and it will reset to start there

  7. #27
    Join Date
    Aug 2018
    Posts
    18

    Re: new to cnc, need help with meshcam

    is there an easy way to change mach3 to just work in inches? i think thats the only solution, this will break the machine. i think meshcam has problems translating it. the stl file is in inches, the machine/mach3 is in mm's, and meshcan support is a joke they don't even reply yet want to sell software...alternatively can anyone suggest a better software for a novice?

  8. #28
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    Cool Free model

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  9. #29
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    ,مدل های سه بعدی دستگاه سی ان سی رایگان,free download model cnc ,free 3d,free art cnc


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  10. #30
    Join Date
    Mar 2003
    Posts
    35538

    Re: new to cnc, need help with meshcam

    i think meshcam has problems translating it.
    No, you just aren't doing something right.

    is there an easy way to change mach3 to just work in inches?
    Config > Select Native Units. Select Inches, close and restart Mach3.

    Config > Motor Tuning
    Foe each axis:
    Multiply Steps per by 25.4
    Divide velocity by 25.4
    Divide Acceleration by 25.4
    Save Axis Settings.

    Close and restart Mach3.

    I'd recommend creating a new profile, and modifying that one.

    - - - Updated - - -

    alternatively can anyone suggest a better software for a novice?
    Try Deskproto maybe?
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  11. #31
    Join Date
    Aug 2018
    Posts
    18

    Re: new to cnc, need help with meshcam

    i was choosing mm in meshcam but the gcode looks like it has mm and inches. apparently others have had the same issue. i switched to vectric aspire and now i have no problems. thanks for the input though

  12. #32
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    Aug 2018
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    anyone need CNC router ?1300x2500mm 3.5KW air cooling spindle .3500USD only
    wa:+8613006583887 Freya

  13. #33
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    anyone need CNC router ?1300x2500mm 3.5KW air cooling spindle .3500USD only
    wa:+8613006583887 Freya

  14. #34
    Join Date
    Jun 2015
    Posts
    119

    Re: new to cnc, need help with meshcam

    I am not that familiar with Mach3, but it looks to me like the problem program was not calling a tool height (G43 H...) or a work offset (G54 - the offset may have a default, so that might not be an issue). The program you showed that you said did work had both callouts, so maybe that is the problem?
    ____________________________
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