Surface - Cut line

[leow_john]

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Hi All:

I would like to share with you one thing.

When I use surface option for milling, using cut line option, I notice some time,the surface not exactly not follow the 3D Model.

Especially I noticed when I give profile stock allow negative value (for EDM spark gap).

Some area more material removes, but when I check

 

[marker4x4]

When you say that your cutter gouges the part, how much of an error are we talking about? Is it larger than your Sequence tolerance?


Lastly, what do you set your tolerance at. I think default is .001" and that's not good enough, you would need at least .0001" if not less.

 

[leow_john]

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Thanks for the reply,

Let me explain more.

See this example

My question that I would like to share with you is

1.The resulted spark gap for A and B will be same or not?
That is spark gap will act in XYZ direction or in XY only.
(My experience it will act only in XY in this case, but for EDM we need it in XYZ.

2.Any thing to control with

 

[leow_john]

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Hi all

Another point for your thought

When do the same work piece with pocketing option, I got a better result.

So I would like to ask

What make the difference in pocketing and surface sequence?

Regards

Leow

 

[chf65]

Hi Leow,


To answer some questions:


- The resulted spark gap for A and B will be same or not? NO. This picture shows the tool tip, not how much it goes inside the part. BY_TOOL_CONTACT is the way the toolpath is computed. It is always shown in playpath the same as any other toolpath as tool tip .


- That is spark gap will act in XYZ direction or in XY only. IN XYZ always.


- What make the difference in pocketing and surface sequence? Totally different toolpaths. In picture 1, if you want to keep the surface flow, you use cutline. In the pocket like part, you do not use cutline (unless you want to use a continuous helical toolpath)


Also, I second Mark's advice about tolerance. You need a tighter tolerance.

 

[leow_john]

Hi Mr. Chf65

Thanks for the detailed reply.

 

[chf65]

Hi Leow,


We have communication problems, so I will rephrase.


The picture that you used to mark A and B shows distance between tool tip and geometry (which will be different based on the surface slope).


The result is always 3D offset. Like what you need in electrodes for spark gapa nd spherical orbits.


Negatice stock allow will NOT give you 2D offset.

 

[leow_john]

.........thank you.......

Regards

Leow