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  1. #1
    Join Date
    Nov 2006
    Posts
    5

    polar interpolation radial tool

    hello,

    Iam having trouble milling flat on a cylinder, not getting a straight flat using radial endmill by using polar interpolation programming on nakamura with fanuc ottb control

    iam getting a radial flat, any programme and ideas will be much appreciated

    regards,
    zas.

  2. #2
    Join Date
    Sep 2010
    Posts
    1230

    Re: polar interpolation radial tool

    Quote Originally Posted by zaheerabbas97 View Post
    hello,

    Iam having trouble milling flat on a cylinder, not getting a straight flat using radial endmill by using polar interpolation programming on nakamura with fanuc ottb control

    iam getting a radial flat, any programme and ideas will be much appreciated

    regards,
    zas.
    Hello zas,

    When you say radial end mill, are you referring to an end mill with axis parallel with X axis?

    Post a listing of your program for the forum to see and comment on.

    Regards,

    Bill

  3. #3
    Join Date
    Nov 2006
    Posts
    5

    Re: polar interpolation radial tool

    thanks bill,

    yes, the tool is parallel to X axis, I have to mill a slot across the cylinder as there is no Y axis in the machine so trying to mill using C axis
    X50
    z-9.6
    G112
    G1 G42X42 C-22F0.2
    G02X22.2C-11.1 R10
    GO1C11.1
    G02X42C22R10
    G1G40X50
    G113

    Regards,
    zas

  4. #4
    Join Date
    Sep 2010
    Posts
    1230

    Re: polar interpolation radial tool

    Quote Originally Posted by zaheerabbas97 View Post
    thanks bill,

    yes, the tool is parallel to X axis, I have to mill a slot across the cylinder as there is no Y axis in the machine so trying to mill using C axis
    X50
    z-9.6
    G112
    G1 G42X42 C-22F0.2
    G02X22.2C-11.1 R10
    GO1C11.1
    G02X42C22R10
    G1G40X50
    G113

    Regards,
    zas
    Hello Zas,
    Using Cutter Radius Comp will give you unexpected results using a flat faced end mill in the manner you're applying the tool. The part is a relatively small diameter, accordingly, you should have room to use a Side and Face cutter mounted on an arbor used parallel with the Z axis. In this arrangement you will be able to use Tool Radius Comp and have no problems machining a flat feature.

    Regards,

    Bill

  5. #5
    Join Date
    Nov 2006
    Posts
    5

    Re: polar interpolation radial tool

    thanks bill,

    I did tried without comp and with comp but no success either way, as I cant use side endmill parallel to Z axis, as the front dia is 25mm for 9.6 mm length.

  6. #6
    Join Date
    Sep 2010
    Posts
    1230

    Re: polar interpolation radial tool

    Quote Originally Posted by zaheerabbas97 View Post
    thanks bill,

    I did tried without comp and with comp but no success either way, as I cant use side endmill parallel to Z axis, as the front dia is 25mm for 9.6 mm length.
    Hi Zas,
    I'm suggesting using a Side and Face cutter; similar to a slitting saw only thicker and with cutting edges on the each side and the periphery of the cutter. The radial difference between the 25mm diameter at the front and the flat is only 1.4mm; a Side and Face cutter will clear that easily.

    You won't be able to achieve the result you want using the flat end of an end mill; the face of the cutter will interfere with the work surface as the C axis rotates to generate the straight trajectory. To prove the point to yourself, replace the flat end mill with a ball nose cutter and run the program, Although a slot will be cut the form of the ball nose, the bottom of the slot will be a straight surface.

    Regards,

    Bill

  7. #7
    Join Date
    Dec 2008
    Posts
    3214

    Re: polar interpolation radial tool

    Fanuc controls apply cutter comp to the axis defined in the ONE active plane only ie G17 = XY (comped) Z depth control, G18 XZ=comped, Y=depth control, G19 YZ=comped, X=depth control
    - no compensation is applied to any axes of rotation

    You need to program tool centreline path for using C axis, & use an exact size cutter

    or ( if you had a Y axis ), lock the C axis, and then you could use comp as you are using XYZ only

  8. #8
    Join Date
    Sep 2010
    Posts
    1230

    Re: polar interpolation radial tool

    Quote Originally Posted by Superman View Post
    Fanuc controls apply cutter comp to the axis defined in the ONE active plane only ie G17 = XY (comped) Z depth control, G18 XZ=comped, Y=depth control, G19 YZ=comped, X=depth control
    - no compensation is applied to any axes of rotation

    You need to program tool centreline path for using C axis, & use an exact size cutter

    or ( if you had a Y axis ), lock the C axis, and then you could use comp as you are using XYZ only
    Hi Superman,
    Tool Radius Comp is available with Polar Interpolation. In this case "C" is a virtual "Y" axis.

    Regards,

    Bill

  9. #9
    Join Date
    Nov 2006
    Posts
    5

    Re: polar interpolation radial tool

    Thanks mates,

    I did explained using a side endmill on Z axis to the manager, he is not convinced abt it, so now plunging the endmill at different C axis positions, we are getting a flat surface but the endmill is leaving it radius on the sides I mean its not a smooth st form. anyway guys I will try using cam on Monday as its a long weekend in Brisbane

    Regards
    zaheer

  10. #10
    Join Date
    Sep 2010
    Posts
    1230

    Re: polar interpolation radial tool

    Quote Originally Posted by zaheerabbas97 View Post
    Thanks mates,

    I did explained using a side endmill on Z axis to the manager, he is not convinced abt it, so now plunging the endmill at different C axis positions, we are getting a flat surface but the endmill is leaving it radius on the sides I mean its not a smooth st form. anyway guys I will try using cam on Monday as its a long weekend in Brisbane

    Regards
    zaheer
    Hello Zaheer,
    Attached is a picture of a typical Side and Face Cutter, they are quite different to a side cutting end mill. They are available in many OD's and Width, from quite small to very large and mount on an arbor. They are available in Indexible Carbide Insert, Silver Soldered Carbide Insert, and solid HSS form.

    Attachment 256896

    The radial distance from your 25mm OD at the front of the part to the flat is only 1.4mm. If the arbor the cutter is mounted on is smaller than the OD of the Side and Face by only 2.8mm then the arbor would just brush the 25.0mm diameter when the Side and Face cutter is at X22.2. Accordingly, if the arbor OD is smaller than the Cutter OD by more than 2.8mm you will be able to cut the flat without interference. It would be rather unusual to have a Side and Face cutter and arbor that varied in diameter by only 2.8mm.

    Regards,

    Bill

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