Question to understanding turning I-J-K-Values

[makko74]

Hi,

yesterday i've made 3 little nc-programs for a friendly company.
My first simple turning Parts with HSM. 😄
For the Post-Process i've used the fanuc turning.cps.
Now my question:
on milling I,J,K values are incremental from arc-start to centerpoint.
in the fanuc turning.cps stands:

_{var xFormat = createFormat({decimals:(unit == MM ? 3 : 4), forceDecimal:true, scale:2}); // diameter mode}

and for I and K outputs

_{// circular output
var kOutput = createReferenceVariable({prefix:"K"}, xFormat);
var iOutput = createReferenceVariable({prefix:"I"}, xFormat); // no scaling}

Is this normal thats I- and K-Values must also scale with 2 on turning?

Thank you in advance

[skidsolo · Accepted solution]

Some machines can be programmed with either diameter or radius values for X. It can be changed by a machine parameter in the controller to suit the users preference. The Haas turning post is does not have scaled IJK. So the answer is they are different.

http://forums.ge-ip.com/showthread.php?t=14635

[makko74]

AndrewWard wrote:
Some machines can be programmed with either diameter or radius values for X. It can be changed by a machine parameter in the controller to suit the users preference.

OK, and the effects are also on I and K Values. Right?

Thank you Andrew

[Laurens-3DTechDraw · Accepted solution]

makko wrote:
AndrewWard wrote: Some machines can be programmed with either diameter or radius values for X. It can be changed by a machine parameter in the controller to suit the users preference. OK, and the effects are also on I and K Values. Right? Thank you Andrew

The way the k&iOutputs are set-up here means are scaled like the X-value. So if X is scaled to diameter mode the k&i will be too.

[makko74]

Laurens-3DTechDraw wrote:
makko wrote: AndrewWard wrote: Some machines can be programmed with either diameter or radius values for X. It can be changed by a machine parameter in the controller to suit the users preference. OK, and the effects are also on I and K Values. Right? Thank you Andrew The way the k&iOutputs are set-up here means are scaled like the X-value. So if X is scaled to diameter mode the k&i will be too.

It was just incomprehensible to me thats the K -Values must also entered in diameter mode.
Now its a little bit clearer, i've no Lathe and the machinist is up to next week on vacation,
so i'm asking here.

Thank you for your time and answers Laurens and Andrew

[Laurens-3DTechDraw]

makko wrote:
It was just incomprehensible to me thats the K -Values must also entered in diameter mode. Now its a little bit clearer, i've no Lathe and the machinist is up to next week on vacation, so i'm asking here. Thank you for your time and answers Laurens and Andrew

Works like a charm on our Fanuc machine. 😉