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modified "Linear" strategy for materials
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MarcusWolschon
2017-10-08
17:12 CEST
The forum software said "Failed to post thread." and my thread apeared but with no content.

Here is the content I wanted to post:
I'm doing finishing passes with a very small toolpath-distance
in materials that easily melt if you machine the same spot for too long a time.

e.g. the desired outcome is a "Parallel" or "Crosswise" strategy with a "distance between toolpathes" of d/16.

I'm thinking of writing a small program that takes a Deskproto
project file with a D/4 strategy and copies that strategy with a different Y minimim point.
Effectively doing a D/4 pass with an offset of
0
+D/8

+D/16
+D/8+D/16

+D/32
+D/16+D/32
+D/8+D/32
+D/8+D/16+D/32

...
So
a) it passes over the same point only 4 times and then that point has time to cool down while the remainder of the material is being machines.
b) the surface quality increases incrementally. This strategy can be stopped at any time when the machinist says that the desired quality is achieved
c) If the operatre does a finishing at e.g. D/8 and then sees that the surface qualiity is not yet goot enough. It allows to do another (e.g. D/16) finishing pass that does not do cut the same pathes that the earlier D/8 one but only the additional ones.

Having such a strategy inside Deskproto would be a great improvement but until then I'm trying to do this by modifying the project file with a small script. (because I don't want to copy&paste a strategy by hand quite that often . Nor adjust all of them when I want to make a change to the "master" pass.)

Lex
2017-10-12
10:12 CEST

Hi Marcus,

I do not know why the first two posts went wrong, perhaps a time-out issue...?

It took me some time to understand what you meant: does the image above correctly visualize this suggestion ?
I will add it to our idea's list, no idea though if there will be many users who would benefit from such addition.

In the mean time this effect could be achieved by combining several operations with identical settings, only a very small change in the Y-min of the area to be machined (sub-segment) for each operation.

Lex.


MarcusWolschon
2017-10-12
17:30 CEST
Yes, that's the idea.

I'll try to write a program to do modify project-files to insert these copy&pasted operations with the changed Y-Min.
No need to do that manually in the UI. ;)

MarcusWolschon
2017-10-13
20:20 CEST

I wrote a first version of my small java program to modify Deskproto project files to implement this strategy.

github.com/MarcusWolschon/DeskProtoOperationReplicator/ tree/master/DeskProtoOperationReplicator/src/biz/wolschon/cnc/deskproto



MarcusWolschon
2017-10-17
19:05 CEST
Update:
I added a README.md to the guithub project, explaining what it does.

MarcusWolschon
2017-12-30
11:33 CET
I had a look at the scripting and wizards and I think I can re-implement this as a script or modify a copy of an existing wizard to output these operations.

Lex
2017-12-30
13:12 CET
Hi Marcus,

That is indeed a good option, making it available as easy-to-use feature.
Be aware that scripting has changed in DeskProto V7. So in case you want to work in a new wizard you can best do this for V7, otherwise the result will soon be obsolete.
I can email you the V7 scripting documentation if you like.

Lex.

MarcusWolschon
2018-07-24
17:30 CEST
Where can I find the "DeskProto Script Reference"?

It sounds interesting to automate some more complex tasks.

Lex
2018-07-25
09:31 CEST
Hi Marcus,

The script documentation is emailed on request, as we'd like to know how many DeskProto users are interested in scripting.
So I will email the ZIP file to you.

Lex.

MarcusWolschon
2018-08-06
19:03 CEST
I wrote a simple script to automatically generate this complex finishing strategy (much easier then to do it outside Deskproto)
based on an existing finishing operation as a template for a large number of
automatically generated ones.
Here is some feedback regarding scripting, that came up:


bugs:
* I got Deskproto to crash by adding the calculation
var count = Math.pow(2, iteration)
with iteration being either 1 or 2
* copyOperation(index) is documented as returning the index of the newly generated operation.
However
var newIndex = DPActivePart.copyOperation(3);
DPActivePart.operation(4).name = "newIndex=" + newIndex;
reveals newIndex as "undefined".
* aparently Deskprotp will happily accept "nan" as any segment value through scripting

documentation bugs:
* ScriptOperationBase*operation(int index) does not document what is
returned if the given index is invalid.
* the documentation mentions constants.js for the operation names
but Wizards/Common/constants.js does not contain these constants.

feature requests:
* there is no way to abort a script (that is accidentally running an endless loop)
* A keyboard shortcut for File-Run Script would be nice.
* If not using the default directory for development,
having to select the directory again every single time command is painful.
* The script documentation should cover how to display errors and
how to do basic debug logging.
(It may be covered in the QML documentation but I was coding offline,
during a long train ride with no Wifi or cellphone reception.)
* we do have DPActivePart.operation(int index) but I can not find any way to get
the number of operations on that part. Just like DPProject has numberOfParts.
That would allow me to make my script much more robust and to require no
hardcoded configuration anymore.
* A way to ask the user to select an operation or part would be nice.
There is an activePart but no activeOperation.
* I can calculate ALL toolpathes but not just some operations or even "visible only".
That would be useful together with writeNCProgram(path) to automatically export all
my generated operations into one file each.
* what is a good method of referencing constants.js without making any assumptions
about where in the file system the current script is?

I have not yet seen how to chain operations in a script.
setChaining(part, previousOperation) does not seem to create new chains.
All operations that are chained to something at all seem to end up in "Chain 1".


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