CNC Repair Tip #17: G30 Position (2nd Reference Position) on Fanuc Controls
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What is a G30 position?
CNC repair work often requires that you have an understanding of how the G30 works. In short, it’s a 2nd reference position…or 3rd reference position…or 4th. It is a position set in NC parameters that is a specified distance from the machine zero-return position. It may be used to set a tool-change or a pallet change position that is not machine zero.
I say 2nd, 3rd or 4th, is because setting parameters allows you to have several “alternate” reference posoitions. On Fanuc 16, 16i18, 18i,21, 21i, 30i, 31i and others, NC parameter 1241=2nd reference, 1242=3rd reference, 1243=4th reference.
As stated, on Fanuc 16, 16i18, 18i,21, 21i, 30i, 31i and others, the G30 position is set in parameter 1241 for the specified axis. Other controls will use a different parameter number (see Commonly Altered Parameter Chart).
Let’s say that you have a horizontal machine that has a headstock that moves in X and Y and the table feed toward the spindle is Z axis. Let’s also say that the position at which the ATC functions is not machine position X0.0000 and Y 0.0000. X and Y have to move to a G30 position for the ATC function. Calling the 2nd reference poistion in a program for the X and Y axes of a machine with a Fanuc control would typically look like this: G0 G91 G30 X0. Y0.;
It breaks down like this:
G0: RAPID MOVEMENT
G91: INCREMENTAL DISTANCE
G30: 2ND REFERENCE POSITION
X0.:DISTANCE FROM 2ND REFERENCE POSITION
Y0.:DISTANCE FROM 2ND REFERENCE POSITION
The machine will move in rapid to the values set in NC parameter 1241 (on specific controls) for X and Y axes from machine zero for these axes.
Calling up the 3rd reference position in a program for the X and Y axes of a machine with a Fanuc control will typically look like this:
G0 G91 G30 P3 X0. Y0.;
It works the same way as the 2nd reference position call but the “P3” calls the 3rd reference position specifically. The machine will move in rapid to the values set in NC parameter 1242 (on specific controls) for X and Y axes from machine zero for these axes.
Check out www.pinpointcnc.com for machine repair information, procedures and other products
Go to www.cncalarm.com for machine alarms and details
Go to www.toyookivalve.blogspot.com for information on Toyooki products
Go to Fanuc Control Central for all Fanuc related posts
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CNC Machines with Fanuc Controls: Welcome to Fanuc Control Central
Attention: Please read the Terms of Use for this site before proceeding.
Approximately 2/3 of all CNC controls in the field have the Fanuc name on them. Because of this fact, it is therefore likely that you may run into a Fanuc control on any given day if you work in the business of CNC field service and repair.
This page is ”Fanuc Control Central”. As we post new material that is in any way related to CNC machines with Fanuc Controls of any type, they will be listed on this page. This should make it easier to review what we have available for review and get to the information quickly. We hope you can find the Fanuc control information you are looking for here. Please bookmark this page and refer to it often for new Fanuc related posts and updates.
These are the Fanuc control related posts that we have available currently:
CNC Repair Tip #16: Fanuc 31iMA-Machine Position Display in Metric
CNC Repair Tip #15: Fanuc 15iMB On Horizontal Machine with Stuck in Reset
Mori Seiki SH-50 with Fanuc 16-M Control: Limit and Proximity Switch Table
CNC Repair Tip #12: Using Fanuc Parameter RMV
CNC Repair Tip #10: Fanuc Beta and Fanuc Beta i Alarms
Fanuc 21-MB: Using an M-Code to Jump from Cutting Program to Sub-Program
CNC Repair Tip #8: Axis Interlock (No Axis Movement) on a CNC Machine with Fanuc Control
CNC Repair Tip #7: Fanuc CNC: Avoiding Crashes Due To Incorrect Offset Adjustments
Axis Soft Overtravel (Soft OT) Alarms: Stroke Limit Function for Fanuc Controls
CNC Repair Tip #6: Mori Seiki Lathe Not Moving in G01 Feed Mode
CNC Repair Tip #3: Fanuc Position Switch Parameters (or PSW’s)
CNC Repair Tip #2: Fanuc Alarm 028 (Illegal Plane Select) on Fanuc 18iTB Control
CNC Repair Tip #17: G30 Position (2nd Reference Position) on Fanuc CNC
Check out www.pinpointcnc.com for machine repair information, procedures and other products
Go to www.cncalarm.com for machine alarms and details
Go to www.toyookivalve.blogspot.com for information on Toyooki products
Go to Fanuc Control Central for all Fanuc related posts
Filed Under Fanuc Control | 2 Comments
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