constant surface feed on lathes where does the go?

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27 Jul 2011 05:55 #11905 by cmorley
Right now i can't find it in the new manual but somewhere it says for CS feed to work the origin
must be on the centerline of the lathe. What i don't quite understand is the reference point.

If it said the tool tip needs to be on center, that i can understand.
(obviously thats not a good reference since each tool is different length)
So can someone clear this up for me?

Chris M

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27 Jul 2011 12:20 #11918 by andypugh
cmorley wrote:

Right now i can't find it in the new manual but somewhere it says for CS feed to work the origin
must be on the centerline of the lathe. What i don't quite understand is the reference point.

It means that X command (or DRO) must be correct.
If you touch-off or use a tool length offset such that a diplsyed diameter of 1" is actually 2" then the surface speed will be higher than programmed.

I think that is all that is meant.

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27 Jul 2011 13:32 #11921 by BigJohnT
Yea, that is "programmer speak" ie. precisely accurate in the minimum of words.

www.linuxcnc.org/docview/html/gcode_main...ec:G96,-G97:-Spindle

John

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27 Jul 2011 19:59 #11928 by willburrrr2003
My understanding, from what I have been reading for setting up my CSS on my lathe, it is saying that your tool tip x offset has to be 0.0 at the center point of the spindle (centerline of the lathe) . This allows the CSS calculation performed as the x position changes to set the correct spindle rate for the CSS that you have set in your g-code.


Regards,

Will

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27 Jul 2011 20:08 #11930 by BigJohnT
Actually the tool and or work offset can be anything that makes the DRO read 0.0 when the tool tip is at the center of the spindle.

John

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27 Jul 2011 20:25 #11932 by willburrrr2003
Ok, that makes sense :)

Will

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28 Jul 2011 00:22 #11935 by cmorley
Well that makes sense - for some reason i got the notion that the machine origin had to be on the centerline of the ways.
It was meant that the user coordinate's origion need to be at center.
Can't think of a reason you wouldn't want the tool to cut on the proper diameter.

Thanks

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