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Author Topic: Help turning arc profile  (Read 14984 times)
cadwiz
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« on: September 20, 2015, 15:54:32 pm »

Not sure what I'm doing wrong here, toolpath shows I'm cutting everything except what I want to remove.

Part profile has arc, I want to remove the inside portion, toolpath indicates cutting everything outside of arc

Is there a reverse option somewhere?

Cadwiz


* XZ Drawing.JPG (17.47 KB, 375x561 - viewed 380 times.)

* Desired Cut.JPG (16.49 KB, 246x552 - viewed 408 times.)

* Toolpath.JPG (19 KB, 280x540 - viewed 408 times.)
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lloydsp
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« Reply #1 on: September 20, 2015, 15:57:11 pm »

CAD,
It's much more helpful if you also attach the .cb file with your other descriptions.

It's hard to see what's wrong with something we cannot see!  Wink

You'll get help here fast, though.

LLoyd
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cadwiz
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« Reply #2 on: September 20, 2015, 16:00:49 pm »

Oops, forgot that part.

* 1.5in K-Baffle Profile_Scoop.cb (6.12 KB - downloaded 206 times.)
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EddyCurrent
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« Reply #3 on: September 20, 2015, 16:28:04 pm »

Did you read this ? http://www.cambam.info/doc/plus/cam/Lathe.htm
because your drawing looks to be in the wrong plane for a start
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cadwiz
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« Reply #4 on: September 20, 2015, 16:45:37 pm »

Drawing and MOP are set up in the XZ plane.  Not an expert in CB Lathe but I have cut a few things successfully.  This is the first time trying this particular profile.  I tried removing all the reference lines and leaving just the arc, same result
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Bubba
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« Reply #5 on: September 20, 2015, 17:48:07 pm »

Not sure I understand your problem Will this sample help you?

* 1.5in K-Baffle Profile_ScoopSAMPLE.cb (6.81 KB - downloaded 200 times.)
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EddyCurrent
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« Reply #6 on: September 20, 2015, 18:37:36 pm »

Using Bubba's file, if you just want the arc cut out;

* 1.5in K-Baffle Profile_ScoopSAMPLE_2.cb (7.78 KB - downloaded 198 times.)

* Image6.jpg (53.86 KB, 1000x529 - viewed 393 times.)
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cadwiz
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« Reply #7 on: September 20, 2015, 19:14:42 pm »

Thanks for the help but I really did mean for the drawing to be oriented in the way it was shown.  This is with the z-axis indicated.  I guess maybe Cambam didn't like trying to cut the inside of an arc in the x direction

Cadwiz


* Arc with Z-axis indicated.JPG (19.15 KB, 469x373 - viewed 385 times.)
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EddyCurrent
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« Reply #8 on: September 20, 2015, 19:40:18 pm »

Maybe there's a better way than using the Lathe MOP ? do you have a 3D drawing of what you are making ?
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cadwiz
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« Reply #9 on: September 20, 2015, 20:32:26 pm »

I have a 3D model but haven't drawn the arc scoop in.  Basically making the item indicated here with arc scooped out of the bottom face surface.  Everything basically turned just have to carve out the scoop.  I could do it with a form tool on my manual lathe but what's the fun in that.  Could also do it with a ball end mill on rotary table, but again kinda defeats the utility of having a CNC lathe handy.  I could even do it on my CNC mill with 4th axis rotary but figured lathe was the easier way to go.  I looked at some of the wizards in Mach3 but nothing really fits for cutting an arc offset from the z-axis.

Cadwiz


* Kbaffle.jpg (18.95 KB, 291x283 - viewed 390 times.)
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dh42
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« Reply #10 on: September 20, 2015, 21:03:34 pm »

Hello,

The lathe operation is not yet designed to do front cut or internal cut as mentioned in the doc Wink

Quote
Only profiling operations are currently supported. No facing, boring or threading support yet.

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cadwiz
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« Reply #11 on: September 20, 2015, 21:10:10 pm »

Bummer, I was afraid that might be the case.  Well, guess I'll fall back to other options.

Thanks,
Cadwiz
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