CamBam at Cabin Fever 2013

[lloydsp]

I'm not the 3D powerhouse that Ralf is, but when I look at that shape, I see it being fairly easily cut in three 'mounts' -- that is, by rotating the work 120 degrees, and doing a surface machining of the mesh that would be projected to that view.

If I were attacking it, I'd set the stock up in a horizontal indexer, and generate three projections for the machining.

That would take me days to figure out.  Ralf can probably do it in his sleep! <G>

LLoyd

[dh42]

Hello,

Is CamBam capable of generating a toolpath and gcode for this object?  I tried and what I seem to obtain is a 2D object.  

To obtain something, you must at least set parameter like stock surface, clearance plane, tool diameter positioning the workpiece correctly.. etc ... and maybe read the doc here first  

http://www.cambam.info/doc/dw/0.9.8/tutorials/3DProfile.htm

I attach a file corrected, but you need a tool of 8" long ....   ; not sure it's the real size of what you want to machine, but if it is, you need to rotate the part 90° and machine it horizontally in two sides machining .. it's also the case if machined vertically because you can't cut under the material ; (see arrow on photo)

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David

[dh42]

Hello Lloyd,

I thing that the method in 2 faces I ave used for my 'pipe' (on the French doc) can work on this shape, no need 4th axis, but the shape need some works to increase the quality ; it is very faceted !!

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David

[lloydsp]

David,
The only reason I suggested the 4th axis (which could be manual) was because of the LOOOONNNG stick-out of the tool, if machined vertically.

If it really takes a bit 8" long, then to provide enough stiffness, the bit would have to be about 1-1/4" in diameter (unless the stock is very weak, easily-machined material).

LLoyd

[Bubba]

this is a rotational (4th axis) work if I see one..

[dh42]

The hand of my dentist has at least 5 axes      (and she has beautiful eyes  )

[mofosheee]

I can see how Bubba said that he sees it as 4 axis. 

Why is it that after I resize the image to 25% if original value then declare a "start here point"  of 0,0,0, and create gcode that the .nc file shows a z axis travel of 9 inches?

Thank you

[dh42]

Hello,

If I well understand, you have only changed the 3D model size ?

If it is, your problem is because you must also change the values in the machining operation (mop) to match the new size of the object.

in this case: stock surface and clearance plane must be reduced to match the new size of the object.

clearance plane must by above stock surface.

You can know size and positioning of the object by selecting it and use the menu: Tools/Get objects extrema ; they will be displayed in the bottom windows.

http://www.cambam.info/doc/dw/0.9.8/ToolsMenu.htm


I just re find a post where I show the "double side" machining of my doc, but in English this time.
http://www.cambam.co.uk/forum/index.php?topic=2461.msg15126#msg15126

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David

[mofosheee]

Dear Sirs:

With the knowledge that I have gained from this board I have reduced the size of the image and established a stock surface (see attachment) 

I am looking to do the water line roughing that was suggested but am unable to find the tabs that would allow me to progress with this.

Bubba suggested that this appeared to be a 4 axis operation where the object would be rotated 3(ea) times 120 degrees and machined.  Are there any examples of how this is accomplished?  Thanks to all that have responded.

Sincerely,

Jerry

[dh42]

Hello,

In 4 faces, here

http://www.cambam.co.uk/forum/index.php?topic=1774.msg10143#msg10143

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David

[dh42]

re

And an example for 3 sides. (the A axis along the Y of the machine)

the code for rotation is in the Custom MOP footer of each MOP.

Cutviewer can't simulate this, I must do one simu by face.

Have fun 
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David

[mofosheee]

David

I would like to thank you for the responses to my inquires.  You and the other responders have been a great help. 

I recently downloaded CutViewerI.  If I were to successfully create a 3D model in CamBam and were to run that model in CutViewer, would the program show the complete milling operation of the model including the rotating the part say, 180 degrees for milling?  As all ways, Thank you.

Jerry

[dh42]

Hello,

No, cutviewer work only with 3 linear axis, it's not possible to simulate a rotational axis ...

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David

[mofosheee]

Hi David

As a favor and for tutorial purposes would you please examine the attached .cb file and tell me how I could do it better. Thank you

Jerry

[dh42]

Hello,

I assume you want cut it with 4 axis

First thing, for have a good view, I toggled "toolpath visibility" to "selected" (main folder)

the first thing that I view is that the object is not centered for the rotation ; you need to align it with X or Y axis ; here I align it on X, assuming your 4th axis is along the X axis

you need also align in Z ; I use the align window: X=left, Y and Z= center.

I take the extrema for know size and postion in Z.  for Z
I have –0.5433 … to +0.5433 (axis = 0 = centered in Z for a rotational axis)

Now I can define a stock by using this infos ; it's only needed for simulation with CV, but it's still useful to show if the part fit in the stock .. I set a stock of 6 , 1.3 , 1.1 in size with a stock surface to 1.1 / 2 = 0.55 and stock offset is set to 0 in X and 1.3 / 2 = -0.65 in Y

A this stage, we have this.

 

Now we can fit the values in the MOP's.

Part1 – roughing.
First we set the min and max in Z (stock surface and target depht)
SS= 0.5433
TD = -0.5433
clearence plane a little above the stock surface = 0.6

I change also some other things.

stepover is set to 0.5 ; it's better with a ballnoze.
resolution is set to 0.05 -> with a tool of 0.1875 it give a resolution of 0.1875*0.05=0.0094 inch (~0.25 mm) that means that the toolpaths will follow the Z height of the model with a precision of 0.0094 inch.

I add also boudary marging of 0.2 to allow the tool to down at each side of the model.
Boudary method is set to shape outiline.

Now, to do the finishing, just copy paste your MOP and change some little things.

set roughing clearance to 0, depth incr to 0, stepover to 0.1, and you can reduce boudary marging to 0.1

For the second finishing (vertica), just copy/paste your finishing mop and change to "vertical" in the 3D profile method.

The second face.

Copy paste the first part to do a second part with the same MOPs.

In each MOP, change:

backface to true
backface zero Z  = 0

edit the header of the first MOP to rotate the A axis(G0 A180) and check the other headers that must be removed because copy/paste of mop (only the first MOP of each part must have the rotational infos)
 
the profile that you added is not needed; but you must do something to hold the part ; left some material at each end of the objet for example.

For this object, maybe it's more easy to do without 4th axis, by flipping the part on the table ; in this case you can add some tabs to hold the part

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David