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# Minimum material removed

Builder

What is the exact meaning of this three option

And what is the value of "minimim material removed"

My toolpath list like this

1) cavity mill stock  1mm

2) z level stock .4mm

3) rest cavity mill (want to put stock .12mm) than what is the value in minimum material removed

15 REPLIES 15

# Re: Minimum material removed

Siemens Phenom

Hi Vora,

It is complex to explain in details how this parameter is considered, but basically the toolpath is generated twice- once considering it (1) and second time ignoring it (2) and then paths are compared. if a cut in path (2) do not exist in path (1) it means that it should be ignored. if a cut in path (2) exists in path (1) (partially or entierly) it means that it should remain.

The previous operations you defined - not only leavse material based on their stock (1mm, 0.4mm) but also based on the tool size and shape and the depth of cut will leave stairs of material on slanted walls.

the question you have to answer is if you want the rest cavity to machine the entire part as a semi finish operation (then you can set MMR to 0), remove the stairs left from Z level (then set it to 0.4 or slightly more) or only rough places where the previous tools could not get in (then use a larger value dependent on the material left after Z-level in the areas the Z-level operation could machine).

There is a top value you should not pass and that is the depth of cut you are going to use in the rest cavity operation. the reason is that if you exceed it the system may remove a complete cut level in some cases cuasing to a "heavy cut" at the begining.

sorry for the length and complexity of the expalnation..

Eddy Finaro
NX CAM Product Manager
Siemens PLM

# Re: Minimum material removed

Builder
Very complex
Cant understand exactly what you say
Thnx

# Re: Minimum material removed

Builder
Actually MMR is which value
1) stock left by previous operation
Or
2)detect material where stock is more than MMR(value in MMR box)

# Re: Minimum material removed

Siemens Phenom

The second. with this parameter you tell the system what amount of IPW you want it to ignore.

Eddy Finaro
NX CAM Product Manager
Siemens PLM

# Re: Minimum material removed

Siemens Phenom

Hi @Vora,

it is 2)

It will skip all the material, where the size is less than the value in the MMR box.

Cheers,

Alexander

Lead Product Manager - Mold & Die

# Re: Minimum material removed

Builder
Tell plz simple now i want stock per face .12mm and previously operation left stock .4 mm than what value should i consider in MMR

# Re: Minimum material removed

Siemens Phenom

As I wrote above - if you want all area to be machined with the new operation to reduce the stock from 0.4 to 0.12 (like a semi finish) - set it to 0.

if you want it only to machine areas where previous tool cannot get in (like corners, channels etc) - set it to be slightly smaller than depth of cut.

You can try with both settings and see which better fits your need.

Eddy Finaro
NX CAM Product Manager
Siemens PLM

# Re: Minimum material removed

Builder
@Eddy Finaro
In Rest mill
1)can we set z level profile where previous tool is reach in both direction and
2)set cavity mill where previous tool is reach like this

# Re: Minimum material removed

Builder
Plz see this picture its interesting