Contour Parameter: Depth Cut . Unpredictable ?.

[Jimic]

I encouter an unpredictable situation.

 

Example: By machining a deep 1/2" pocket. Using a 1/4 Endsmill. So I was using 5 depth of cut .100/depth

 

At the Define Tool: parameter

I setup

 

Rough xy step (%) : 0

Rough z step : .1

Finsih XY step : 0

Finish Z step : 0

 

At the Contour parameter: Depth cuts

When I click on the depth Cuts box

It Shown

 

max. rough step; .1

# finish cut: 0

Finish step : .0625

 

 

My qustions:

 

Where the 0.o625 came from I didn't ask for it?

Even I changed Rough z step to .2 at define tools. It still show .0625 at Finish step.

I didn't ask for Finish step .

Also, everytime when I reopen my file the info

at Define Tool is gone. I have to restep it.

 

How you guys do it?

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RTFM ,man !

~~~~~~~~~~~~~~

 

Contour depth cuts divide the total depth of a toolpath into smaller Z-axis cuts to reduce tool wear. To set the number of depth cuts, you can enter a maximum rough step and Mastercam divides the total depth into equal steps. Or you can enter the exact number of finish steps and the size of each finish step. Mastercam never creates unequal rough depth cuts.

 

~~~~~~~~~~~~~~~~~~~~~

[Cuda84]

If your # finish step = 0 then the .0625 will not be in the program. At least it should not be. All depths should be .1. Run the toolpath in backplot and see what the step down is in the program itself.

[john316]

.

 

quote:

---

max. rough step; .1

# finish cut: 0

Finish step : .0625

---

The only thing I can think of with the .0625 is that it is a default from something. With your "finish cut" set at 0 it isn't using it anyway.

 

As Iskander said, Mcam takes the total depth of your cut and devides it into depths that will not violate your max depth setting. Take note that on your roughing depth, the value you input is used as a max depth.

 

.

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Do you use thin walls function

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Use the following parameters on the Thinwall finish passes dialog box to calculate the finish steps:

 

¨ Max rough stepdown from Depth Cuts – displays the maximum rough stepdown from the Depth Cuts dialog box. Use the Depth Cuts button on the Pocketing Parameters tab to edit this field.

 

¨ Max calculated finish step – displays the maximum Z depth for each finish pass. You cannot edit this field.

 

¨ Z Finish passes per rough depth cut – enter the number of finish passes you want to use.

 

¨ To determine the machining direction, select Climb to cut in the direction opposite the spindle motion, or Conventional to cut in the same direction as spindle motion.

 

Mastercam divides the Max rough stepdown from Depth Cuts by the Z finish passes per rough depth cut to determine the Max calculated finish step.

The following graphics show examples of pocket toolpaths with and without thin wall finish passes. Notice that the toolpath with the thin wall passes on uses more finish passes.

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At the Define Tool: parameter

I setup

 

Rough xy step (%) : 0

Rough z step : .1

Finsih XY step : 0

Finish Z step : 0

~~~~~~~~~~~

I never use it

I PREFER TO SET DEPTHES .

Il like full control ,so I always change them according to situation

 

aLSO THIS PARAMETER CAN BE FROM PREVIOUS OPERATION

 

~~~~~~~~~~~~~~~

C-Hook Name: prmdef.dll/.txt

 

Date: 30 January 2003

 

Programmer: CNC Software, Inc.

 

Description:

When you make a new operation, default parameter settings for the new

operation are taken from a preceding operation (if a preceding operation

of the same type can be found) or from the default operation library

(if it is not found).

 

In some cases, you may not wish to "carry" the parameter settings from

one operation to the next. An example of this is when making multiple

contour operations, each at different absolute depths.

 

This chook will prompt you to turn on or off the use of preceding

operation. This value will reset to "use the preceding operation"

when you exit Mastercam.

 

You may use this chook as the startup chook (see Screen/Config).

 

Input:

1-Yes, use preceeding operation of same type to set the defaults for a

new operation. If no similar operation is found, the parameters

from the default library will be used.

2-No, use only the parameters from the default library.

 

Distributor: CNC Software

671 Old Post Road

Tolland, CT 06084

~~~~~~~~~~~~~~~~~~

[William Grizwald]

The unpredicatable results bring up a thorn in my side with using "max rough depth".

 

In the real world - by default and without a calculation - we want to tell MCX exactly the depth of cut for each pass. This is critical with specialized insert cutters and high speed milling. Another need is alternating depths of cuts for inserted tools. This would reduce premature notching of inserts.

[Jimic]

Where in the Screen/config.?? That i can change the setting ??

 

 

This chook will prompt you to turn on or off the use of preceding

operation. This value will reset to "use the preceding operation"

when you exit Mastercam.

 

You may use this chook as the startup chook (see Screen/Config).

 

Input:

1-Yes, use preceeding operation of same type to set the defaults for a

new operation. If no similar operation is found, the parameters

from the default library will be used.

2-No, use only the parameters from the default library.

[kublikahn]

Jimic,

 

Its a chook, not an option in Configuration. From the settings menu, choose the "Run user application" command. Then select prmdef.dll.

 

The Kahn

[kublikahn]

Ahhh, if you mean "where do I set the chook to run automatically on startup?", Settings - Start/Exit page.

 

There is a section on the right that says "Add-In Programs" use the file cabinet button to browse to your chooks folder and select the chook that you want to run on startup.

 

HTH

 

The Kube

[Jimic]

???

 

I can't find prmdef.dll at the chool dir

 

????

 

That how my setup right now:

 

Startup: None

Exit : None

Default: TRIME.dll

[Fig sign]

VX ?

[Jimic]

I am using Mcamx MR2 level-2

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I wrote considering ver9

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