4th Axis Calibration How to?


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Thread: 4th Axis Calibration How to?

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    Default 4th Axis Calibration How to?

    Hello,

    Bit of noob help needed please.

    I have a 4th axis/rotary How do you set up MACH3 so it knows it's done a 360 turn when it has done an exact 360 turn?

    Any perspective on this would be of great help just to get me going. Maybe I'm just looking at this whole thing wrong.

    Best, Jono

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    Default Re: 4th Axis Calibration How to?

    what`s the diameter of your 4rth axis chuck sir?



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    Default Re: 4th Axis Calibration How to?

    Hi KHOUJ,

    Thaaanks, It says in the manual that it's 80mm.



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    Default Re: 4th Axis Calibration How to?

    Quote Originally Posted by Jono888 View Post
    Hi KHOUJ,

    Thaaanks, It says in the manual that it's 80mm.
    ok sir 80mm diameter = 251.32mm perimeter

    mark the spindle itself with one line then align it to the spindle motor, line centered, then input the 251.32mm in the axis calibration A in the diagnostics page. it should turn 360 degrees and end at you marked position, if it lapses, measure the lapse in mm then add it to the 251.32mm then enter it in the calibration window, re align again the marked point in the spindle then re run the 251.32mm until it will stop to it`s point after rotating 360 degrees, if it`s under then minus the gap in mm to the 251.32mm then enter the value on the calibration page until you get it aligned.



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    Default Re: 4th Axis Calibration How to?

    You're a star. So simple when you know how but a real head ache until the penny drops. Thank you very much for taking the time to answer this post it really means a lot....



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    Default Re: 4th Axis Calibration How to?

    Quote Originally Posted by KH0UJ View Post
    ok sir 80mm diameter = 251.32mm perimeter

    mark the spindle itself with one line then align it to the spindle motor, line centered, then input the 251.32mm in the axis calibration A in the diagnostics page. it should turn 360 degrees and end at you marked position, if it lapses, measure the lapse in mm then add it to the 251.32mm then enter it in the calibration window, re align again the marked point in the spindle then re run the 251.32mm until it will stop to it`s point after rotating 360 degrees, if it`s under then minus the gap in mm to the 251.32mm then enter the value on the calibration page until you get it aligned.
    I believe that this is incorrect.
    It's a rotary axis, so you want to tell mach3 that's it's actually moving 360°, not the diameter of the chuck. Because if you command A180, instead of moving 180°, it would turn 180/251.32 degrees.

    My preference would be to calculate the steps/degree based on the gear ratio of your rotary axis and the microstepping of the drive.

    Gerry

    UCCNC 2017 Screenset
    [URL]http://www.thecncwoodworker.com/2017.html[/URL]

    Mach3 2010 Screenset
    [URL]http://www.thecncwoodworker.com/2010.html[/URL]

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

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


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    Default Re: 4th Axis Calibration How to?

    maybe there`s another way sir, but I always draw on a 4rth axis using this method, in a 3D environment my rectangle would be 252 then the width is the length of the material, then make a G-code on that rectangle model then wrap the G-code with a G-code wrapper so if I draw a 3D head I divide it by 2 then put it in the rectangle then make a G-code on it then wrap with the G code wrapper works every time



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    Default Re: 4th Axis Calibration How to?

    Thanks too. My rotary axis is a 1:6 How would I work out the best steps figure? My driver is a 2DM542 I can adjust the pulse from 100 - 25000. What would the formula look like?



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    Default Re: 4th Axis Calibration How to?

    Set the microstepping to 1600.
    If it's a 6:1 reduction, then it's 1600 x 6 = 9600 steps per revolution. 9600/360 = 26.66667 steps/degree.

    Gerry

    UCCNC 2017 Screenset
    [URL]http://www.thecncwoodworker.com/2017.html[/URL]

    Mach3 2010 Screenset
    [URL]http://www.thecncwoodworker.com/2010.html[/URL]

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

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


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    Default Re: 4th Axis Calibration How to?

    on a perimeter method I draw a model in 251.3mm and the length let`s just say 100mm, this will look like this on a 3D environment

    4th Axis Calibration How to?-1-jpg

    Then import it in the CAM program just a rectangle then the code looks like this:

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    ( 10 )
    S1000
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    ( 11 )
    S1000
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    G0 X52.4467 Y0.0
    G0 Z1.0
    G1 Z-0.4
    G1 Y-251.3
    ( 12 )
    S1000
    G0 Z3.0
    G0 X55.8195
    G0 Z1.0
    G1 Z-0.4
    G1 Y0.0
    G0 Z3.0
    G0 X0 Y0
    G0 Z0
    M5
    M30
    Then I import it again to the G-code wrapper software then there`s an option there to put your desired diameter of the material (ex. 50mm dia) then it automatically converts the G-code into that diameter, you can input any diameter you want.

    Code:
    (PROGRAM CONVERTED WITH CNCWRAPPER)
    (4 AXIS CNC.NC - WRAPPED )
    (4/6/2017 12:08:02 AM)
    (Y AXIS MOVES CONVERTED TO ROTATIONAL A AXIS)
    (JOB DIAMETER = 50)
    (CHECK CODE BEFORE RUNNING ON CNC!)
    
    ( T0 : 0.0 )
    G21 G90 G91.1 G64 G40
    G0 Z3.0
    ( T0 : 0.0 )
    T0 M6
    ( 1 )
    G17
    M3 S1000
    G0 X13.3467 A0.00
    G0 Z1.0
    G1 F2000.0 Z-0.4
    G1 A575.94
    ( 2 )
    S1000
    G0 Z3.0
    G0 X16.7195
    G0 Z1.0
    G1 Z-0.4
    G1 A0.00
    ( 3 )
    S1000
    G0 Z3.0
    G0 X24.3605 A65.13
    G0 Z1.0
    G1 Z-0.4
    G1 X29.2
    G1 A41.30
    G1 X32.4953
    G1 X46.3928 A72.55
    G1 A78.47
    G1 X32.4953
    G1 A84.49
    G1 X29.2
    G1 A78.47
    G1 X24.3605
    G1 A65.13
    G0 Z3.0
    G0 X32.4953
    G0 Z1.0
    G1 Z-0.4
    G1 A46.01
    G1 X41.0121 A65.13
    G1 X32.4953
    ( 4 )
    S1000
    G0 Z3.0
    G0 X24.3605 A114.14
    G0 Z1.0
    G1 Z-0.4
    G1 X24.9496
    G1 X25.2779 A117.36
    G1 X25.9127 A119.96
    G1 X27.1205 A122.51
    G1 X29.1682 A125.59
    G1 X46.3928 A149.12
    G1 A150.04
    G1 X28.6906 A173.77
    G1 X26.641 A176.87
    G1 X25.5227 A179.35
    G1 X25.1326 A181.34
    G1 X24.9496 A184.01
    G1 X24.3605
    G1 A152.18
    G1 X24.9496
    G1 A153.49
    G1 X25.0371 A156.75
    G1 X25.2998 A158.88
    G1 X25.6102 A159.68
    G1 X26.0321 A159.94
    G1 X26.6211 A159.65
    G1 X27.815 A158.20
    G1 X30.5054 A154.70
    G1 A131.46
    G1 X28.404 A128.69
    G1 X27.4449 A127.67
    G1 X26.6688 A127.34
    G1 X25.8808 A127.89
    G1 X25.3316 A129.57
    G1 X25.1088 A131.84
    G1 X24.9496 A136.02
    G1 X24.3605
    G1 A114.14
    G0 Z3.0
    G0 X31.6834 A133.16
    G0 Z1.0
    G1 Z-0.4
    G1 X39.1177 A143.25
    G1 X31.6834 A153.05
    G1 A133.16
    ( 5 )
    S1000
    G0 Z3.0
    G0 X24.3605 A187.41
    G0 Z1.0
    G1 Z-0.4
    G1 A205.17
    G1 X24.9336
    G1 X25.053 A202.23
    G1 X25.4192 A200.97
    G1 X26.0321 A200.51
    G1 X26.5733 A200.90
    G1 X27.8787 A203.47
    G1 X29.4865 A206.82
    G1 X27.0668 A210.75
    G1 X25.6659 A212.30
    G1 X25.1883 A211.60
    G1 X24.9336 A207.93
    G1 X24.3605
    G1 A233.21
    G1 X24.9336
    G1 X25.0491 A231.18
    G1 X25.3316 A229.62
    G1 X26.4858 A226.82
    G1 X28.5791 A223.17
    G1 X33.4823 A215.31
    G1 X35.8702 A220.06
    G1 X37.2293 A223.11
    G1 X38.0591 A225.84
    G1 X38.4909 A228.51
    G1 X38.656 A231.37
    G1 X39.245
    G1 A215.31
    G1 X38.656
    G1 X38.3456 A218.34
    G1 X37.7805 A219.19
    G1 X36.8174 A218.22
    G1 X35.3289 A215.31
    G1 X34.4693 A213.47
    G1 X36.6343 A209.92
    G1 X37.4939 A208.56
    G1 X37.9874 A208.32
    G1 X38.3536 A208.71
    G1 X38.6401 A211.23
    G1 X38.656 A212.54
    G1 X39.245
    G1 A187.41
    G1 X38.656
    G1 X38.4769 A189.63
    G1 X38.067 A191.63
    G1 X37.092 A194.01
    G1 X35.2175 A197.36
    G1 X30.4735 A205.17
    G1 X28.6587 A201.43
    G1 X26.6111 A196.82
    G1 X25.5306 A193.45
    G1 X25.0829 A190.57
    G1 X24.9336 A187.41
    G1 X24.3605
    ( 6 )
    S1000
    G0 Z3.0
    G0 X43.989 A241.61
    G0 Z1.0
    G1 Z-0.4
    G1 X44.9342 A242.16
    G1 X45.7321 A243.79
    G1 X46.2754 A246.21
    G1 X46.4565 A249.08
    G1 X46.2754 A251.99
    G1 X45.7321 A254.42
    G1 X44.9342 A256.06
    G1 X43.989 A256.60
    G1 X43.0458 A256.05
    G1 X42.2538 A254.40
    G1 X41.7165 A251.96
    G1 X41.5374 A249.08
    G1 X41.7165 A246.21
    G1 X42.2538 A243.79
    G1 X43.0458 A242.16
    G1 X43.989 A241.61
    G0 Z3.0
    G0 X39.245 A236.85
    G0 Z1.0
    G1 Z-0.4
    G1 A255.88
    G1 X27.4489
    G1 X26.1574 A256.15
    G1 X25.4351 A256.99
    G1 X25.0908 A258.64
    G1 X24.9336 A261.36
    G1 X24.3605
    G1 A236.85
    G1 X24.9336
    G1 X25.0928 A239.47
    G1 X25.5067 A241.32
    G1 X26.1753 A242.05
    G1 X27.4489 A242.29
    G1 X36.1408
    G1 X37.4322 A242.01
    G1 X38.1546 A241.17
    G1 X38.4988 A239.53
    G1 X38.656 A236.85
    G1 X39.245
    ( 7 )
    S1000
    G0 Z3.0
    G0 X23.9626 A267.76
    G0 Z1.0
    G1 Z-0.4
    G1 X29.3114 A266.99
    G1 A268.64
    G1 X27.4728 A271.23
    G1 X26.1594 A274.63
    G1 X25.3714 A278.34
    G1 X25.1088 A281.84
    G1 X25.2262 A283.95
    G1 X25.5784 A285.64
    G1 X26.0977 A286.75
    G1 X26.7166 A287.12
    G1 X27.429 A286.76
    G1 X28.0379 A285.67
    G1 X29.7253 A279.17
    G1 X31.2138 A273.05
    G1 X32.3043 A269.56
    G1 X33.6773 A267.16
    G1 X35.1856 A266.36
    G1 X36.8233 A267.26
    G1 X38.2979 A269.97
    G1 X38.9073 A271.98
    G1 X39.3426 A274.39
    G1 X39.6037 A277.21
    G1 X39.6908 A280.43
    G1 X39.5435 A284.06
    G1 X39.1018 A287.56
    G1 X38.863 A289.70
    G1 X38.9824 A291.10
    G1 X39.6589 A292.80
    G1 A294.45
    G1 X34.5807 A295.18
    G1 A293.53
    G1 X36.4831 A290.52
    G1 X37.669 A287.39
    G1 X38.2899 A284.22
    G1 X38.4968 A281.06
    G1 X38.3874 A279.22
    G1 X38.0591 A277.66
    G1 X37.5875 A276.61
    G1 X37.0482 A276.26
    G1 X36.2204 A277.23
    G1 X35.3349 A280.17
    G1 X33.9837 A285.91
    G1 X32.5192 A291.83
    G1 X31.2934 A295.30
    G1 X30.1213 A296.99
    G1 X28.8179 A297.56
    G1 X27.5882 A297.08
    G1 X26.3823 A295.67
    G1 X25.3276 A293.38
    G1 X24.5516 A290.33
    G1 X24.074 A286.70
    G1 X23.9148 A282.71
    G1 X24.082 A278.91
    G1 X24.5834 A274.02
    G1 X24.7585 A272.03
    G1 X24.5595 A270.57
    G1 X23.9626 A269.36
    G1 A267.76
    ( 8 )
    S1000
    G0 Z3.0
    G0 X29.3274 A391.16
    G0 Z1.0
    G1 Z-0.4
    G1 X27.4648
    G1 X25.8311 A385.51
    G1 X24.7187 A379.64
    G1 X24.08 A373.14
    G1 X23.8671 A365.64
    G1 X23.9536 A360.52
    G1 X24.2133 A355.70
    G1 X24.6461 A351.17
    G1 X25.252 A346.93
    G1 X26.0201 A343.08
    G1 X26.9395 A339.69
    G1 X28.01 A336.77
    G1 X29.2318 A334.31
    G1 X30.5502 A332.37
    G1 X31.9103 A330.98
    G1 X33.3121 A330.15
    G1 X34.7558 A329.87
    G1 X36.2801 A330.18
    G1 X37.7646 A331.11
    G1 X39.2092 A332.64
    G1 X40.6141 A334.80
    G1 X41.9215 A337.48
    G1 X43.0736 A340.59
    G1 X44.0706 A344.13
    G1 X44.9123 A348.10
    G1 X45.5809 A352.35
    G1 X46.0585 A356.73
    G1 X46.345 A361.24
    G1 X46.4405 A365.88
    G1 X46.1938 A373.01
    G1 X45.4536 A380.53
    G1 X44.8805 A386.21
    G1 X44.974 A387.66
    G1 X45.2546 A388.90
    G1 X45.7381 A389.84
    G1 X46.4405 A390.38
    G1 A392.28
    G1 X38.9585
    G1 A390.38
    G1 X40.3375 A389.09
    G1 X41.5454 A387.33
    G1 X42.5821 A385.11
    G1 X43.4477 A382.43
    G1 X44.1303 A379.42
    G1 X44.6178 A376.21
    G1 X44.9103 A372.82
    G1 X45.0078 A369.23
    G1 X44.7173 A363.32
    G1 X43.8457 A357.92
    G1 X42.5045 A353.47
    G1 X40.8051 A350.40
    G1 X38.266 A348.11
    G1 X35.4563 A347.34
    G1 X32.6883 A347.90
    G1 X30.179 A349.58
    G1 X28.0896 A352.44
    G1 X27.2628 A354.34
    G1 X26.5813 A356.56
    G1 X26.0485 A359.12
    G1 X25.6679 A362.02
    G1 X25.4396 A365.28
    G1 X25.3635 A368.89
    G1 X25.5863 A374.84
    G1 X26.2549 A380.27
    G1 X27.4688 A385.57
    G1 X29.3274 A391.16
    ( 9 )
    S1000
    G0 Z3.0
    G0 X24.3605 A399.12
    G0 Z1.0
    G1 Z-0.4
    G1 X24.9496
    G1 X25.1406 A403.73
    G1 X25.6818 A406.69
    G1 X26.6489 A408.29
    G1 X28.1175 A408.82
    G1 X43.3522
    G1 X43.9253 A407.42
    G1 X45.0556 A403.73
    G1 X45.358 A399.12
    G1 X45.9471
    G1 A422.46
    G1 X32.559 A454.92
    G1 X41.8399
    G1 X43.4676 A454.50
    G1 X44.4666 A453.22
    G1 X44.8685 A451.86
    G1 X45.1511 A450.10
    G1 X45.358 A445.41
    G1 X45.9471
    G1 A467.15
    G1 X45.358
    G1 X44.9043 A461.54
    G1 X44.5382 A460.27
    G1 X43.9969 A459.31
    G1 X43.1433 A458.71
    G1 X41.8399 A458.51
    G1 X23.8671
    G1 A456.86
    G1 X41.8399 A412.37
    G1 X28.1175
    G1 X26.5574 A413.01
    G1 X26.0042 A413.83
    G1 X25.6022 A414.96
    G1 X25.1127 A417.75
    G1 X24.9496 A420.91
    G1 A422.46
    G1 X24.3605
    G1 A399.12
    ( 10 )
    S1000
    G0 Z3.0
    G0 X29.3274 A534.69
    G0 Z1.0
    G1 Z-0.4
    G1 X27.4648
    G1 X25.8311 A529.05
    G1 X24.7187 A523.17
    G1 X24.08 A516.67
    G1 X23.8671 A509.17
    G1 X23.9536 A504.05
    G1 X24.2133 A499.23
    G1 X24.6461 A494.70
    G1 X25.252 A490.46
    G1 X26.0201 A486.61
    G1 X26.9395 A483.22
    G1 X28.01 A480.30
    G1 X29.2318 A477.85
    G1 X30.5502 A475.91
    G1 X31.9103 A474.52
    G1 X33.3121 A473.69
    G1 X34.7558 A473.41
    G1 X36.2801 A473.72
    G1 X37.7646 A474.64
    G1 X39.2092 A476.18
    G1 X40.6141 A478.33
    G1 X41.9215 A481.01
    G1 X43.0736 A484.12
    G1 X44.0706 A487.66
    G1 X44.9123 A491.63
    G1 X45.5809 A495.88
    G1 X46.0585 A500.26
    G1 X46.345 A504.77
    G1 X46.4405 A509.41
    G1 X46.1938 A516.55
    G1 X45.4536 A524.07
    G1 X44.8805 A529.74
    G1 X44.974 A531.19
    G1 X45.2546 A532.44
    G1 X45.7381 A533.38
    G1 X46.4405 A533.92
    G1 A535.81
    G1 X38.9585
    G1 A533.92
    G1 X40.3375 A532.62
    G1 X41.5454 A530.86
    G1 X42.5821 A528.64
    G1 X43.4477 A525.96
    G1 X44.1303 A522.95
    G1 X44.6178 A519.75
    G1 X44.9103 A516.35
    G1 X45.0078 A512.76
    G1 X44.7173 A506.85
    G1 X43.8457 A501.46
    G1 X42.5045 A497.00
    G1 X40.8051 A493.93
    G1 X38.266 A491.64
    G1 X35.4563 A490.88
    G1 X32.6883 A491.44
    G1 X30.179 A493.11
    G1 X28.0896 A495.97
    G1 X27.2628 A497.88
    G1 X26.5813 A500.10
    G1 X26.0485 A502.65
    G1 X25.6679 A505.56
    G1 X25.4396 A508.81
    G1 X25.3635 A512.42
    G1 X25.5863 A518.37
    G1 X26.2549 A523.80
    G1 X27.4688 A529.11
    G1 X29.3274 A534.69
    ( 11 )
    S1000
    G0 Z3.0
    G0 X52.4467 A0.00
    G0 Z1.0
    G1 Z-0.4
    G1 A575.94
    ( 12 )
    S1000
    G0 Z3.0
    G0 X55.8195
    G0 Z1.0
    G1 Z-0.4
    G1 A0.00
    G0 Z3.0
    G0 X0 A0.00
    G0 Z0
    M5
    M30




  11. #11
    Member dharmic's Avatar
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    Default Re: 4th Axis Calibration How to?

    For shallow engraving work, KHOUJ, your approach of wrapping a linear axis around the circumference will get the job done.

    But bear in mind it is not geometrically correct, unable to cope with features that aren't perpendicular to the surface and that, with a CAM that supports a proper 4th axis, it's unnecessary.

    As ger21 says, work out the number of steps per rotation, then per degree. Bang that number into your Mach A axis settings. Use KHOUJ's marker method to confirm a G00 A360 move (from A position of 0.0) roughly takes it full circle and then use an indicator to make sure it's a precise full circle.



  12. #12
    Member KH0UJ's Avatar
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    Default Re: 4th Axis Calibration How to?

    @ OP sorry sir my method is considered a freestyle method, For all I know I am good at manipularing a 3D object in the 3D environment, and these method is consideted dangerous, if there's a proper method on it please follow that, for me I can manipulate any 3d model on a 4 axis (precised gears, custom tpi threads, whole car model on fourth axis) but it's really dangerous if you dont know how to manipulate it in a 3D environment, im just doing it by my own understanding and got used to it, but for first timers using a freestyle method on a 4 axis routing is a threat to your safety sir. Use the proper way.



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    Default Re: 4th Axis Calibration How to?

    Hello Gerry, Firstly thank you for your help! Is there a piece of gcde one uses to get the axis to turn 360 to test it or a switch in MACH3? Really am a noob but once I get it then I've got it LOL Once again, many thanks



  14. #14
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    Default Re: 4th Axis Calibration How to?

    Hi KHOUJ,

    Many thank! What type of 3d drawings do you cut out?



  15. #15
    Member ger21's Avatar
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    Default Re: 4th Axis Calibration How to?

    G1 A360

    Gerry

    UCCNC 2017 Screenset
    [URL]http://www.thecncwoodworker.com/2017.html[/URL]

    Mach3 2010 Screenset
    [URL]http://www.thecncwoodworker.com/2010.html[/URL]

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

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


  16. #16
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    Default Re: 4th Axis Calibration How to?

    Quote Originally Posted by Jono888 View Post
    Hi KHOUJ,

    Many thank! What type of 3d drawings do you cut out?
    gun parts, gun part molds for aluminum , try practicing wood first sir, after you get bored on machining wood then try it on metals, aluminum first, then brass, then tiger bronze then mild steel, stainless steel, then high carbon steel, the most challenging metal is the stainless steel because if it gets hot it`ll expand too quickly breaking your tool bit, I can basically make the 4 axis into something like a mini lathe machine, that`s how powerful the 4 axis is .



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    Default Re: 4th Axis Calibration How to?

    Thanks All the best!



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4th Axis Calibration How to?

4th Axis Calibration How to?