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Author Topic: Turns INSIDE and OUTSIDE of part  (Read 879 times)
steve T
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« on: June 28, 2017, 00:34:59 am »

My first CAMBAM turning project, essentially the classic pawn chess piece idea. Following the online help, and a helpful Youtube video, I can get toolpath generation - but I am getting toolpaths inside the profile as well as outside. I get a warning about an open polyline - but the Youtube example didn't make their line explicitly closed as far as I can see.

Grateful for any help.


* Capture.JPG (90.39 KB, 1397x600 - viewed 49 times.)
« Last Edit: June 28, 2017, 00:36:40 am by steve T » Logged
lloydsp
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« Reply #1 on: June 28, 2017, 00:47:04 am »

Your .CB file is essential to getting proper help!

Lloyd
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dh42
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« Reply #2 on: June 28, 2017, 01:01:39 am »

Hello

Is your profile done with an unique polyline or multiple arcs ?

If it's not an unique polyline, select all segments then 'join' them (and re assign the new polyline to your machining operation)

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David
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dh42
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« Reply #3 on: June 28, 2017, 01:15:21 am »

After some tests, even a profile made of multiple segments works well (**); the only case where I get something like on your picture is when the profile polyline is done with 2 identical superimposed polylines (the line returns on its steps)

to solve that, you can use 'polyline/remove overlaps' on the profile polyline ; you'll obtain a new polyline (the source polyline stay unchanged) with no overlaps, and you can now assign this new polyline to your lathe MOP.

++
David

** not well, but you do not obtain the result on your picture, but the profile must be done with an unique line ; if not you'll get unwanted rapid moves, and in certain case, collision with the workpiece.
« Last Edit: June 28, 2017, 01:19:48 am by dh42 » Logged
dave benson
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« Reply #4 on: June 28, 2017, 03:56:29 am »

HI Steve
Are you aware of this software "Ezilathe" which is free and is able to to threading.
Dave
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steve T
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« Reply #5 on: June 28, 2017, 04:19:13 am »

Some things to look at. Thanks for those. I just spent $150 on CamBam, so I am not terribly keen on looking at an alternative tool just yet.

Attached, the relevant .CB

* chess piece top.cb (5.56 KB - downloaded 20 times.)
« Last Edit: June 28, 2017, 04:21:23 am by steve T » Logged
Bubba
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« Reply #6 on: June 28, 2017, 05:02:27 am »

There you have..  You had double polylines.

* chess piece top.cb (8.14 KB - downloaded 18 times.)
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EddyCurrent
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« Reply #7 on: June 28, 2017, 08:53:54 am »

As previous replies said, multiple superimposed lines.

I used Edit->Explode on the profile line to get it back to it's component parts then selected them one at a time in the drawing area.
You can see that in the left hand 'tree view' there are a number of unselected lines and arcs, these are the unwanted duplicates.
Use Edit->Join to reassemble the profile then delete those extra unwanted lines and arcs.

It's fair to say that a lot of problems people experience are down to bad drawings in the first instance.


* pic1.jpg (76.8 KB, 1000x400 - viewed 47 times.)
« Last Edit: June 28, 2017, 08:58:24 am by EddyCurrent » Logged
steve T
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« Reply #8 on: June 28, 2017, 15:03:50 pm »

As previous replies said, multiple superimposed lines.

I used Edit->Explode on the profile line to get it back to it's component parts then selected them one at a time in the drawing area.
You can see that in the left hand 'tree view' there are a number of unselected lines and arcs, these are the unwanted duplicates.
Use Edit->Join to reassemble the profile then delete those extra unwanted lines and arcs.

It's fair to say that a lot of problems people experience are down to bad drawings in the first instance.


I looked and looked ! This started as a DXF import, which is the root cause.
 Thanks for all your help folks.

Steve
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Bubba
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« Reply #9 on: June 28, 2017, 15:35:10 pm »

As previous replies said, multiple superimposed lines.

I used Edit->Explode on the profile line to get it back to it's component parts then selected them one at a time in the drawing area.
You can see that in the left hand 'tree view' there are a number of unselected lines and arcs, these are the unwanted duplicates.
Use Edit->Join to reassemble the profile then delete those extra unwanted lines and arcs.

It's fair to say that a lot of problems people experience are down to bad drawings in the first instance.


I looked and looked ! This started as a DXF import, which is the root cause.
 Thanks for all your help folks.

Steve

Did you tried the CB file I fix it for you?
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steve T
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« Reply #10 on: June 28, 2017, 23:10:54 pm »

Yes, your file is great. I went back to first principles and fixed the file myself too.
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