July 23, 2026
David
0

Fanuc CNC Parameter 14852, Fixed Form Character Length

Tags : Change Fanuc Parameters Fanuc Parameters guide i parameters

Fanuc CNC controls include hundreds of parameters that quietly shape how the control behaves. One that often goes unnoticed—but can make a real difference to usability and program readability—is Fanuc CNC Parameter 14852, Bit 4.

This article explains what parameter 14852 bit 4 does, when you might want to change it, and what to watch out for before making any adjustments.

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What Is Fanuc Parameter 14852 Bit 4?

Parameter 14852, Bit 4 controls the number of characters that can be displayed or entered in each fixed form field on supported Fanuc CNC controls.

When this bit is enabled, the control allows more characters per fixed form, effectively expanding the usable text length within those fields.

In practical terms, this means:

Longer text entries are possible
Descriptions and identifiers are less likely to be truncated
Fixed-form screens become more informative and easier to interpret

The exact behaviour can vary slightly depending on the Fanuc control series and software version, but the purpose of Bit 4 remains the same: increase character capacity per fixed form.

What Are Fixed Forms on a Fanuc Control?

Fixed forms are structured input screens used to quickly create program.

Typical forms:

Start of program
Call a tool
Call a cycle
End a program

I means the programmer does not need to memorise loads of G and M codes. The structures is created.

For more details on Fanuc macro variables and fixed forms, check our Fanuc Parameters that cover advanced control functions.

Why Increase the Number of Characters per Fixed Form?

Enabling Parameter 14852 Bit 4 can be particularly useful in the following situations:

1. Improved Program and Process Clarity

Longer character limits allow more information to be added in one keystroke.

2. Better Operator Understanding

Operators can see more meaningful descriptions without abbreviations, reducing the risk of misunderstandings on the shop floor.

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David
2

Rads and Chamfers Fanuc Parameters 8134 3453

Category : Fanuc Parameters

Messing With Parameters Can Be Fatal!!!!!

To change parameters you need to go to the setting screen in MDI. Now put a 1 in the parameter write box.

Bits n Bobs

When counting the bits in parameters you count from right to left so the first one on the right is bit 0 or sometimes known as #0

Rads and Chamfers Fanuc Parameters. Today we are going to change the parameters that make ,R and ,C work this means you can program point to point and just stuff in some rads and chamfers as an afterthought.

Here’s an article on it if you want to use it

Fanuc have two ways of putting on chamfers and rads and that’s where the confusion lies.

Just do as you’re told (oh and read this article)

So in Parameter 3453 you can set bit #0 (CRD) to a 1 this allows what Fanuc call “Direct Drawing Inputs” to work.

Also in Parameter 8134 set bit #2 (CCR) to a o

Now don’t let the description put you off this turns on the crappy one that uses R and R- and K and K-. This only works on 90 degree corners and unless you won Mastermind I wouldn’t even try to understand how it works.

Trust me it’s shit

Anyway Rads and Chamfers Fanuc Parameters 8134 3453 all sorted!

Isn’t it just great to sort out those annoying problems?

If you want to learn about rads and chamfers on a Sinumeric Siemens 840D read this

Other Parameters Of Interest

1300 Stops over travel alarm

1401 Cutting Feed-Rate 0% stops movement of machine

3101 Clear Screen

3102 Unlock Programs

3203 Clear MDI Screen

3204 Unlock Program 9000 to 9999 and 8000 to 8999 to Edit

3291 Wear Offset requires Key to Adjust

3401 Calculator Type Decimal Point or Integer

3402 G Codes that are Active When The machine is Turned On

5003 Retain Geometry when you Press Reset

6005 Allows the Use of Local Subroutines (Newer Control)

6050-6059 Allows you to Call a 9000 series Program with a G Code

6080-6089 Allows you to Call a 9000 series Program with An M Code

8134 3453 allows you to use ,R and ,C (Rads and Chamfers)

That’s it away you go.

Oh just one other thing before you go off and cripple your machine forever.

Do yourself a favour take a picture of the screen before you change a parameter.

If you aint got a camera then you must have a piece of paper.

Even better back everything up.

Thanks

If you have been affected by any of the issues in this post or need CNC Counselling then contact me.

Or call us

If you want to learn to program CNC Milling Machines

Look no further Contact CNC Training Centre

December 3, 2025
David
0

Parameter 3109 Display W and G

Tags : Change Fanuc Parameters Fanuc Parameters

Category : Fanuc Parameters

People who know me know just how boring I am. Today I’m going to confirm this by getting very excited about this parameter.

Parameter 3109 bit 1 (#1) DWT will make the display of wear offsets loose that confusing W and G.

Stay here I’ll explain more.

CNC Training Call David: 07834 858 407

30 five star ratings on Google (just saying)

Messing With Parameters Can Be Fatal!!!!!

Parameter 3109, to change this parameters first you need to go to the setting screen in MDI.

Put a 1 in the parameter write box.

Today we are going to change the parameter that stops the offset page displaying G and W.

Bit 1 (#1) DWT make this a 1 to stop this being displayed.

So when you change this parameter you won’t see a W beside the offset number in the wear screen. You also won’t see the G beside the tool number in the geometry screen.

I know for a fact when training people that this really confuses them. Especially the the G on the geometry screen.

This is it before with the W

Parameter 3109

This is it with the parameter change good old fashioned numbers.

Parameter 3109

As in the book

Parameter 3109

Bits n Bobs

When counting the bits in parameters you count from right to left so the first one on the right is bit 0 or sometimes known as #0

Other Parameters Of Interest

1300 Stops over travel alarm

1401 Cutting Feed-Rate 0% stops movement of machine

3101 Clear Screen

3102 Unlock Programs

3203 Clear MDI Screen

3204 Unlock Program 9000 to 9999 and 8000 to 8999 to Edit

3291 Wear Offset requires Key to Adjust

3401 Calculator Type Decimal Point or Integer

3402 G Codes that are Active When The machine is Turned On

5003 Retain Geometry when you Press Reset

6005 Allows the Use of Local Subroutines (Newer Control)

6050-6059 Allows you to Call a 9000 series Program with a G Code

6080-6089 Allows you to Call a 9000 series Program with An M Code

8134 3453 allows you to use ,R and ,C (Rads and Chamfers)

That’s it away you go.

Oh just one other thing before you go off and cripple your machine forever.

Do yourself a favour take a picture of the screen before you change a parameter. If you ain’t got a camera then you must have a piece of paper.

Even better back everything up.

Thanks

If you have been affected by any of the issues in this post or need CNC Counselling then contact me.

Or call us

If you want to learn to program CNC Milling Machines

Look no further Contact CNC Training Centre

October 29, 2025
David
0

How To Format a Data Card on a Fanuc Control

Tags : Fanuc Fanuc Data Card Format Data Card

Category : Fanuc Fanuc Mill Fanuc Parameters Fanuc Turn

Format a Data Card on a Fanuc Control yes that’s what were going to do. Now first of all I have a confession to make.

People often say to me how nice it is of me to write all these articles helping people with the shit they can’t do. Well sorry it’s not true actually I’m just a selfish bastard just like all the rest of you.

CNC Training Call David: 07834 858 407

30 five star ratings on Google (just saying)

My only reason is that I have and always have had the memory of a goldfish. If you have ever had a goldfish and tried to train it (which I once did). I read books on it like “How to Train Your Goldfish in 3 Easy Steps”, for which I got a refund.

Anyway I digress. The reason you can’t train them is, not least of all because you can’t keep them out of the water too long, but they don’t remember a word you say. Fuck all, Jack shit.

So the minute they learn a nice trick they immediately forget it. It doesn’t bother them because they just forget that it bothered them.

Sorry no more about Goldfish.

Anyway its really easy to Format a Data Card on a Fanuc Control. You just hold in these two babies while switching it on.

Oh and make sure you have data card selected in your parameters.

Format a Data Card on a Fanuc Control

This is me doing it. Yes that’s my gnarled up old hand.

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David
0

Overtravel Axis Fanuc Parameter 1300

Tags : Change Fanuc Parameters Fanuc Parameters

Category : Fanuc Parameters

Messing With Parameters Can Be Fatal!!!!!

Over-travel alarm, make this a thing of the past with this parameter

You first need to go to the setting screen in MDI.and put a 1 in the parameter write box.

Today we are going to change the parameter that stops the machine generating an alarm when it gets to the end of travel.

CNC Training Call David: 07834 858 407

30 five star ratings on Google (just saying)

End Of Travel Alarm Fanuc Parameter

Now I need to start by apologising to all the lovely people at Fanuc. All the years I have moaned and moaned about the fact that when you get to the end of the machine stroke on a Fanuc control you get a stupid alarm.

Actually I have been totally wrong and I offer my sincere apologies to all who have been hurt by my nasty comments about this.

If you set parameter 1300 BIT 1 (NAL) to a 1 then you do not get an alarm when you travel to the end of the machine stroke.