SETUP LATHE TOOL OFFSET & GEOMETRY OFFSET

[MasterCAM Rulez]

HI,

 

Right my company using "TOOL OFFSET" method to setup cnc lathe, but i heard alot company using "GEOMETRY OFFSET" to cnc lathe.

 

1. I would like to know what is the different between tool offset & geometry offset?

 

2. How do you setup cnc lathe using geometry offset?

 

Thanks in advance

[Trevor Bailey]

Are you talking abuout how to use cutter comp? If so, it all depends on how you want to set the machine up. Need more info.

[PE @ IHS]

Tool offset and geometry offset are the same thing in lathes. You might be referring to pre-programming the tool position after tool change, instead of using the geometry offset screen. Older machines (or newer machines with old operators) tend to use G50 with each tool call

i.e G50 X6.00 Z5.550 to tell the machine where the tool tip is in relation to origin. On any lathe newer than 1983 or so, you do not need to do this any more. Instead you can enter the tool offset in the geometry screen, along with wear values, TNR value, and tool direction value.

[CNCme]

Good day,

 

Geometry are tool offsets taken from the geometry of the work piece.

You turn a diam. on the set-up piece, measure

it and, type the axis (X or Z)and the measurment,

and this becomes the geometry offset...Oh your

machine should have a measure function, or else

you have to subtract the diam. from the active position to get your geometry offset.

 

Then you have another offset known as the

wear offset, An amount added or subtracted

to the geometry offset when the tool wears.

 

On Fanuc controls, the offset pages are named

Geometry and wear...but some machines, just

call them offsets.

 

HTH

 

 

Tony G

Unemployed Programmer

N.E Massachusetts - Southern New Hampshire

_________________________________________

End mills and tooling are like The "AMMO"

and coolant and chips are like the enemy

under your boots as you advance in the

Manufacturing Battle.

_________________________________________

[Reece L Gibson]

I Belive this is control specfic,I seen some Fanuc 6TC's have a work shift and use G50 commands.

As far as Geometry offsets, the values in the offset are taken from machine zero to the face of the part or where ever you want to claim zero.

Each tool has it's own values and must be set in advance before the program is run. The beauty of this is as long as the tool is not removed from the turret it can be used from one program to another(diameter wise).I you have work shift function you can shift all geomerty offsets a specfic amount on top of that.

[CNCme]

Good evenin"

 

Correct, 6T and 6Mb are old and need G50 (lathe)

and G92 (mill ), origin statement.

God bless anyone who sets up these...but 10t

and after had geometry and wear...That 6T is old,

like Peter said Pre-1980's

Tony G

Unemployed Senior Programmer

N.E Massachusetts - Southern New Hampshire

_________________________________________

End mills and tooling are like The "AMMO"

and coolant and chips are like the enemy

under your boots as you advance in the

Manufacturing Battle.

_________________________________________