Standardized test shapes

Here's the place for discussion related to CAM/CNC and the development of the Path module.
User avatar
freman
Posts: 1226
Joined: Tue Nov 27, 2018 10:30 pm

Re: Standardized test shapes

Postby freman » Mon Jun 10, 2019 6:56 am

@sliptonic , I just had a look cnctorture and couldn't see how to get the actual files. My instinct was to click on the image to get the details or a FCstd file.

I found you need to click the name but since the HTML does not show the usual colour indication of what is a link, I did not realise until the mouse passed over the name and the underscore jumped out. It would be helpful if the images were active too, or name shows up as a link.

Hopefully this flesh out with some new submissions. It's a good idea.

Do you think the "wall of death" file I posted above is worth adding. Relative arc path are know to be inaccurate is certain cases so this may be useful test of CAD as well a good machine test. It cuts a pocket either side of a circle so theoretically there is nothing left. If there is any play in the machine, this probably won't be the case.
nahshon
Posts: 199
Joined: Wed Jul 24, 2013 8:06 pm

Re: Standardized test shapes

Postby nahshon » Wed Jul 10, 2019 3:37 am

I have some ideas. I still need to get over the technical details of how to add my designs. So far tried the suggested macro to save the images which did not work for me.

Example for 4th axis:
Untitled.png
Untitled.png (34.44 KiB) Viewed 3588 times

This is a 2D example, the challenge is to start with inside cuts so parts should not fall-out before their internal features are complete.
BTW, is there a recommended way to provide processing hints? For example - Here I need to use a 1.5 mm EndMill (or a laser cutter) because a larger tool will surely fail.
Untitled1.png
Untitled1.png (25.6 KiB) Viewed 3588 times
-- Itai
Attachments
Yin-Yang-Example.FCStd
(22.65 KiB) Downloaded 55 times
helix+cube.FCStd
(292.66 KiB) Downloaded 61 times
User avatar
freman
Posts: 1226
Joined: Tue Nov 27, 2018 10:30 pm

Re: Standardized test shapes

Postby freman » Wed Jul 10, 2019 7:26 am

You can order separate operation by editing the job. So break it down into ops that can be ordered to get the required result.
The classic solution to stop pieces breaking away where there is still work to do is to leaved small tabs of material at the bottom of the cut. Some software offers this automatically but I don't think FreeCAD does.

You would need to stop a bit short on depth, say 1mm, then have separate pocket ops designed to but most but not all of that last mm away.

This is quite a lot of work manually and probably should be integrated into the path if ( assuming it is not already available and I've missed it ).
etrombly
Posts: 136
Joined: Thu Dec 05, 2019 6:50 pm

Re: Standardized test shapes

Postby etrombly » Thu Dec 05, 2019 8:07 pm

Freecad does have holding tags (at least development does, not sure about 18). They are available under Path->Path Dressup-> Tag Dressup.
chrisb
Posts: 28017
Joined: Tue Mar 17, 2015 9:14 am

Re: Standardized test shapes

Postby chrisb » Thu Dec 05, 2019 9:15 pm

They are available since 0.17.
herbk
Posts: 1911
Joined: Mon Nov 03, 2014 3:45 pm
Location: Windsbach, Bavarya (Germany)

Re: Standardized test shapes

Postby herbk » Fri Dec 06, 2019 7:02 am

Hi Nashon,

if i look at your first pic, i come in mind that you should look at a mill and think about what can can be done with it... ;) ;)
Gruß Herbert
memfis
Posts: 231
Joined: Tue Nov 15, 2016 7:58 pm

Re: Standardized test shapes

Postby memfis » Mon Dec 16, 2019 2:13 pm

herbk wrote:
Sun Jun 02, 2019 3:58 pm
Hi freman,
i don't know how you get the Operations tree like it is at yor file...



Select the wall of the hole and use the Pocket OP

testpart.jpg
On an example of processing paths from this message I want to pay attention to the painful - operations of selecting round slots. First, the upper groove is selected, the larger diameter. But when you create a path, the program DOES NOT create a path over a future smaller diameter slot, which is located below. I'm sure it's the wrong decision. The whole plane should have been processed and then the next slot would have started from the bottom of the first slot.

If you start the created program "as is", there may be a malfunction when you start processing the center hole (slot).
Attachments
Снимок экрана от 2019-12-16 17-07-05.png
Снимок экрана от 2019-12-16 17-07-05.png (248.04 KiB) Viewed 1844 times
chrisb
Posts: 28017
Joined: Tue Mar 17, 2015 9:14 am

Re: Standardized test shapes

Postby chrisb » Mon Dec 16, 2019 4:07 pm

For such use cases you better use the Facing operation (probably not available in 0.18):
Snip macro screenshot-084651.png
Snip macro screenshot-084651.png (7.27 KiB) Viewed 1837 times
and adapt the StartDepth of the "all-through" pocket.
herbk
Posts: 1911
Joined: Mon Nov 03, 2014 3:45 pm
Location: Windsbach, Bavarya (Germany)

Re: Standardized test shapes

Postby herbk » Mon Dec 16, 2019 7:51 pm

Hi memfis,

if you select the sidewall (like sayd before) Path Pocket Op mills the whole area.
pocket_sidewall.jpg
pocket_sidewall.jpg (50.71 KiB) Viewed 1827 times
Yes, the path for the lower hole starts also at the level which Path presets as Start Depth, but you can change it at the OPs UI.
Gruß Herbert
memfis
Posts: 231
Joined: Tue Nov 15, 2016 7:58 pm

Re: Standardized test shapes

Postby memfis » Mon Dec 16, 2019 8:36 pm

1.png
1.png (168.48 KiB) Viewed 1814 times
I want so many buttons on the toolbars, too! it's not sporting to talk about the same thing, but different things ;)

OS: Arch Linux (GNOME/gnome-xorg)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.18947 (Git) AppImage
Build type: Release
Branch: master
Hash: 91f6a5e5ee1b48063d5d4b59cc6250fc2a1021b1
Python version: 3.7.3
Qt version: 5.12.5
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: Russian/Russia (ru_RU)
Attachments
2.png
2.png (323.33 KiB) Viewed 1814 times