Spherical Radius
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  1. #1
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    Default Spherical Radius

    im trying to program a spherical radius. my OD .211 im using a .015r insert.
    the start of my program is
    x.500 z0.0
    G1x-.04
    -.03
    G2x.211z.1205R.1205
    the issue im having is im getting a .035 flat on my face. im noy using any TNC any suggestions?

  2. #2
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    You need to add your tool radius to the finish Z and radius you are cutting.
    Basically you have to program to the tangent points of the tool radius.

    X-.03
    G2 X.211 Z-.1205 R.1205

  3. #3
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    Quote Originally Posted by Booze Daily View Post
    You need to add your tool radius to the finish Z and radius you are cutting.
    Basically you have to program to the tangent points of the tool radius.

    X-.03
    G2 X.211 Z-.1205 R.1205
    I'm not going to point out the G2 for the OD---oops.

    But isn't what you posted exactly what he posted?

    My guess is he's using a .0312"r insert. If not, he can try feeding into Z by .0098 then finish at Z-.1293. That will be the Tangency of the insert radius.

    R

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    Quote Originally Posted by litlerob1 View Post
    I'm not going to point out the G2 for the OD---oops.

    R
    He is turning from Z0 to Z.1205 (positive) so G2 is correct.

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    Quote Originally Posted by ThunderPants View Post
    He is turning from Z0 to Z.1205 (positive) so G2 is correct.
    Nope, sorry. G2 is a clockwise arc.

    R

    EDIT> I can see clearly now the rain is gone. Unless he's using a sub, or the programming is all wonky, it's redundant anyway. Besides first time poster, probably won't respond anyway.

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    Quote Originally Posted by litlerob1 View Post
    Nope, sorry. G2 is a clockwise arc.

    R

    EDIT> I can see clearly now the rain is gone. Unless he's using a sub, or the programming is all wonky, it's redundant anyway. Besides first time poster, probably won't respond anyway.

    Depends on the machine type, right? My Citizen M and L machines are always Z+ for forward turning (main or sub, using tooling on the turret, gang slide, or back post) and G2 would swing the correct direction for turning a spherical OD feature. I was assuming he knew his machine. But, maybe he doesn't and that's his problem. I suppose no one is right or wrong without more information.

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    Quote Originally Posted by ThunderPants View Post
    Depends on the machine type, right? My Citizen M and L machines are always Z+ for forward turning (main or sub, using tooling on the turret, gang slide, or back post) and G2 would swing the correct direction for turning a spherical OD feature. I was assuming he knew his machine. But, maybe he doesn't and that's his problem. I suppose no one is right or wrong without more information.
    Tell me about it... The Mori SL2 that I am trying to get used to use Negative X values. So 50mm is X-50.0


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