Selecting which side of geometry to rough mill.

[AiR_GuNNeR]

I import a .dxf file of a part that looks like the closed outline of a Pi symbol. I'm using a 1/8" cutter to go around the part to cut it out. If I choose a profile operation, it correctly profiles around the outside perimeter. I wanted to try to create a channel around the part so I could try trochoidel milling. I performed a 3/16" outside offset of the perimeter. I selected roughing, digitized the outline of the part, and then the new offset perimeter for the containment region. However the tool path is now inside the outline of the part. I can't for the life of me figure out how to define which side of the outline to rough on? Any hints?
Thanks.

[txcncman]

Been a while since I even opened EdgeCAM. In MasterCAM it depends on: the point of the profile you click on for conventional or climb milling, and then what you set on cutter comp offset, left, right, or center.

[AiR_GuNNeR]

Originally Posted by txcncman Been a while since I even opened EdgeCAM. In MasterCAM it depends on: the point of the profile you click on for conventional or climb milling, and then what you set on cutter comp offset, left, right, or center.

Thanks for the reply. I tried reselecting from the outside edge and it didn't make a difference. Even swapping climb for conventional didn't make a difference.

[Mimer]

You cant choose trochoidal milling 4 Operations unless you expand your instructions +. And if you do this its pretty much a cycle.

If you are using Roughing Operations : General - Mark Digitise Stock box. (you can expand and choose trochoidal later)

In another thread you claim Edgecam got its own life and you cant start where you want. You can (depending of cycle). Theres a arrow and a star which you can move as you want.

Look in your help files: contents and index - search - start and end points

[AiR_GuNNeR]

Originally Posted by Mimer In another thread you claim Edgecam got its own life and you cant start where you want. You can (depending of cycle). Theres a arrow and a star which you can move as you want. Look in your help files: contents and index - search - start and end points

Thanks for the reply Mimer. Regarding the start point, perhaps the problem is the type of file I started out with. I loaded a .dxf file. In the Start/End window, in the Start/End Point Preference, there is an option Digitize. This puts the start/End as close as possible to the digitized point according to the help file. How do I define this point? Do I need to create a new "Feature" based upon the original .dxf outline?
Eric

[Mimer]

Forget all about start and end points when you rough.

Just so im sure i understand what you want.

First you will rough your contour and leave 5 mm offset.
Next you will run another rough with trochoidal and leave another offset 4 profiling ?

Or just one rough using trochoidal and one profiling ?

Which version Edgecam are you on btw ?

[AiR_GuNNeR]

Right now I am using a 1/8" endmill and two profile operations to cut the part out of 1/4" 6061 plate. The first profile operation is done in four passes leaving .005" on the walls, then a full depth profile operation for cleanup. What I wanted to try was to create a 3/16" wide channel around the part that I could use a trochoidal path on it and hopefully do it on two passes at a greater feed rate, then follow up with a cleanup. To do this, I took the dxf file and performed an offset command on it to get the channel. I thought I would be able to use the roughing command and select the two outlines, and have it rough between them. What i happening is the interior of the inner profile is being cut. I can't get it to select the material between the lines. I thought I could use the dxf files to create a feature or geometry and extrude to create a 3D boss, but the features and geometry items are all grayed out.
Eric

[Mimer]

Which version of Edgecam are you using ?? 2011 R2. 2011 R1 etc ????

[AiR_GuNNeR]

Sorry, you did ask that. It's 2011 r2

[Mimer]

Try this

[AiR_GuNNeR]

Originally Posted by Mimer Try this

Thanks for the help Mimer.

Here is a file of what I have. By the way, I miss-spoke. I meant to say it was an Omega shape, not Pi shape.

I selected the inner shape to rough out, and the offset shape as the containment. It always wants to machine the inside of the inner shape however.

[Mimer]

Can you add your mach3 postprocessor 2 ?

Dont use containment. If your postprocessor supports M-Funktions just add a "Update Stock" after your first roughing. And btw if you wanna rough from outside and in 2 your contour mark checkbox digitise stock and remember 2 put a offset on. When you click ok after that doubleclick on ur stock. (Look lower left corner. Theres a message "digitise stock")