LibLathe - Lathe Path Generation
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Re: LibLathe - Lathe Path Generation
Hello Dan,
can you tell me where the current version of it is? (and is there a write up on how to install the add on?)
thanks,
Ron
can you tell me where the current version of it is? (and is there a write up on how to install the add on?)
thanks,
Ron
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Re: LibLathe - Lathe Path Generation
Hello sir, all the links you need are in the original post.
The github link will get you all the files you need: LibLathe: https://github.com/dubstar-04/LibLathe
The github link will get you all the files you need: LibLathe: https://github.com/dubstar-04/LibLathe
Re: LibLathe - Lathe Path Generation
thanks!!
Re: LibLathe - Lathe Path Generation
Hello,
I used a new disk with a fresh install of ubuntu 20.04, and cloned the git.
I did browse through it for a while, but have no idea how to set it up?
Is there a write up for installing it as an add-on?
(not trying to be a pain here) thanks,
Ron
I used a new disk with a fresh install of ubuntu 20.04, and cloned the git.
I did browse through it for a while, but have no idea how to set it up?
Is there a write up for installing it as an add-on?
(not trying to be a pain here) thanks,
Ron
- dubstar-04
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- Location: Chester, UK
- Contact:
Re: LibLathe - Lathe Path Generation
Hi Ron,
The instructions are on the git page:
https://github.com/dubstar-04/FreeCAD_Turning_Addon
Thanks,
Dan
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- Joined: Sat May 15, 2021 6:11 pm
Re: LibLathe - Lathe Path Generation
I'm having some trouble getting everything to work, but I am very excited by what I can get so far!
For tools: are the tools included with LibLathe usable in the current version?
Also, for tool definitions: It looks like there is some confusion in the libraries about edge length vs Inscribed Circle Diameter.
Quick trick to convert between the two (for parallelogram inserts):
Edge Length = ( tan( Tip_Angle) + atan( Tip_Angle) * Inscribed_Diameter
The above formula should allow for arbitrary definitions of S, C, D, and V shape inserts.
For tools: are the tools included with LibLathe usable in the current version?
Also, for tool definitions: It looks like there is some confusion in the libraries about edge length vs Inscribed Circle Diameter.
Quick trick to convert between the two (for parallelogram inserts):
Edge Length = ( tan( Tip_Angle) + atan( Tip_Angle) * Inscribed_Diameter
The above formula should allow for arbitrary definitions of S, C, D, and V shape inserts.
- dubstar-04
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- Joined: Mon Mar 04, 2013 8:41 pm
- Location: Chester, UK
- Contact:
Re: LibLathe - Lathe Path Generation
Hi Steve,MechaSteve wrote: ↑Sat May 15, 2021 6:22 pm I'm having some trouble getting everything to work, but I am very excited by what I can get so far!
For tools: are the tools included with LibLathe usable in the current version?
Also, for tool definitions: It looks like there is some confusion in the libraries about edge length vs Inscribed Circle Diameter.
Quick trick to convert between the two (for parallelogram inserts):
Edge Length = ( tan( Tip_Angle) + atan( Tip_Angle) * Inscribed_Diameter
The above formula should allow for arbitrary definitions of S, C, D, and V shape inserts.
I don't think the liblathe tools will currently work with FreeCAD due to some issues with relative paths in the toolbit library.
Do you have any examples of what makes you think there is confusion with the edge length definition?
The tool parameters are partially documented here:
https://liblathe.readthedocs.io/en/late ... oling.html
With the edge length value coming from the ISO definition.
The ANSI definition uses the IC. Maybe that's the confusion?
https://littlemachineshop.com/info/insert_charts.php
Thanks,
Dan
Re: LibLathe - Lathe Path Generation
Hi,
I just tried the addon (not very successful actually).
Also the tool library is not very clear to me, if I change to the LibLathe Tools I get following list:
If I create an S Shape insert bit and try to add it I get:
02:54:36 PathToolBit.ERROR: Did not find a PropertyBag in Iso_shape_S - not a ToolBit shape?
I also added the "sample" project, does anyone know where I'm heading into the wrong direction?
I just tried the addon (not very successful actually).
Code: Select all
Running the Python command 'Path_TurnProfile' failed:
Traceback (most recent call last):
File "/Applications/FreeCAD 2.app/Contents/Resources/Mod/Path/PathScripts/PathOpGui.py", line 1319, in Activated
return Create(self.res)
File "/Applications/FreeCAD 2.app/Contents/Resources/Mod/Path/PathScripts/PathOpGui.py", line 1283, in Create
obj = res.objFactory(res.name)
File "/Applications/FreeCAD 2.app/Contents/Resources/Mod/FreeCAD_Turning_Addon/PathTurnScripts/PathTurnProfile.py", line 89, in Create
obj.Proxy = ObjectTurnProfile(obj, name)
File "/Applications/FreeCAD 2.app/Contents/Resources/Mod/Path/PathScripts/PathOp.py", line 193, in __init__
job = self.setDefaultValues(obj)
File "/Applications/FreeCAD 2.app/Contents/Resources/Mod/Path/PathScripts/PathOp.py", line 338, in setDefaultValues
obj.OpToolDiameter = obj.ToolController.Tool.Diameter
'FeaturePython' object has no attribute 'Diameter'Running the Python command 'Path_TurnProfile' failed:
Traceback (most recent call last):
File "/Applications/FreeCAD 2.app/Contents/Resources/Mod/Path/PathScripts/PathOpGui.py", line 1319, in Activated
return Create(self.res)
File "/Applications/FreeCAD 2.app/Contents/Resources/Mod/Path/PathScripts/PathOpGui.py", line 1283, in Create
obj = res.objFactory(res.name)
File "/Applications/FreeCAD 2.app/Contents/Resources/Mod/FreeCAD_Turning_Addon/PathTurnScripts/PathTurnProfile.py", line 89, in Create
obj.Proxy = ObjectTurnProfile(obj, name)
File "/Applications/FreeCAD 2.app/Contents/Resources/Mod/Path/PathScripts/PathOp.py", line 193, in __init__
job = self.setDefaultValues(obj)
File "/Applications/FreeCAD 2.app/Contents/Resources/Mod/Path/PathScripts/PathOp.py", line 338, in setDefaultValues
obj.OpToolDiameter = obj.ToolController.Tool.Diameter
'FeaturePython' object has no attribute 'Diameter'
02:54:36 PathToolBit.ERROR: Did not find a PropertyBag in Iso_shape_S - not a ToolBit shape?
I also added the "sample" project, does anyone know where I'm heading into the wrong direction?
- Attachments
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- FCLatheTest.FCStd
- (26.06 KiB) Downloaded 78 times
Re: LibLathe - Lathe Path Generation
Hi dubstar,
thank you for your great liblathe extension
I made some testing with the current freecad 0.19 and got it running after modifying the provided toolshapes Iso_shape_C/D/S/T.fcstd to meet the current property-bag-requirements. Now I would like to start to with some more work with your turning-jobs.
Would you please help me with the model and toolshape files from your presented example ?
thank you for your great liblathe extension
I made some testing with the current freecad 0.19 and got it running after modifying the provided toolshapes Iso_shape_C/D/S/T.fcstd to meet the current property-bag-requirements. Now I would like to start to with some more work with your turning-jobs.
Would you please help me with the model and toolshape files from your presented example ?
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Re: LibLathe - Lathe Path Generation
In tool.py the function "get_edge_length(shape, edge_length)" appears to return inscribed circle diameter, not edge length.dubstar-04 wrote: ↑Thu May 20, 2021 7:19 am Do you have any examples of what makes you think there is confusion with the edge length definition?
The tool parameters are partially documented here:
https://liblathe.readthedocs.io/en/late ... oling.html
With the edge length value coming from the ISO definition.
The ANSI definition uses the IC. Maybe that's the confusion?
( This is what table 5 shows in the referenced Mitsubishi document)
Also in the tool shape files, the edge length dimension seems to be the inscribed circle, not the edge length.
The edge length should be the length of the complete edge (fully sharp with no tip radius).
It should also be noted that for many common ISO sizes the edge length is only nominal and not exact.
For example: the ISO insert size VCGT110302 has an actual edge length of 11.07mm
The actual fundamental definition of inserts is generally inscribed circle, tip angle, and tip radius.
Thickness should never matter for path generation. (you could have a check for inside turning, but it really requires tool geometry as well.)
The tools center point will typically be set as the diametral contact point of the tool.
For the axial position it will depend on if the tool is Left, Right, or (effectively neutral).
For Left and right it is the axial contact point.
Neutral tools are difficult to set exact axial position, but are typically set at the diametral contact point.
I think the trick is to calculate the path in terms of tip radius center, and then off set to the actual center point.
A tool definition needs to provide:
- Maximum right cutting angle (traveling towards chuck)
- Maximum left cutting angle (traveling away from chuck)
- Tip radius
Outside of deep grooving, the tool can be treated as semi-infinite.