change autocad propeller command

[Riccardo76B]

Good morning to all,
My name is rich and I have just joined this forum.
I am a programmer cad cam for wood pantographs and I wanted to understand if it was possible to bypass an obstacle that I am meeting in the programming phase of 3 axis pantographs. practically I was asked to make bath sinks starting from a single block about 75mm making only the internal concave part of the sink. having only a 3 axes available as a pantograph, the first idea that came to mind was to design with autocad a round sink with in the center the command of autocad "elica". practically giving the starting radius and the final radius, automatically autocad generates the helical spiral on which the mill will be hooked and, changing the number of steps, you go to act on the definition of the past and on the final result. then directly on the machine, having created a unique path, we managed to manage the depth of departure and arrival giving the effect of the concave sink. therefore this first prototype sink has already been made. My problem is that if you were to please the owner and want me to make other sinks but with different shapes from that produced automatically by the propeller how could I do? I could do a lot of polylinea offsets that I want to create but in the machine, not being a unique path, you would see the effect of seeing so many jumpers in milling. to me it would be useful to understand if there is a way to make particular and shaped geometries so that you can then compose it as a single linear polylinea and that it has the characteristics of the propeller, that is from a flat external perimeter you have to offset towards the inside creating a single persorso (hold that in order to reach the result of the first sink, automatically through the helical command I used 250 spire... so I would need a quick method to draw this path and it is not possible to put behind drawing line by line and then join them. I hope I've explained quite well.
thanks and good day

 

[Vittorio]

Hi.
I have an idea, but I don't know if I understand your problem well.
So the first question I ask you is the following.
you with autocad can build a 3d model and export it to stl?
the second question is:
Would you just have a text file with g1 x y z movements to send to your pantograph?

 

[Cristallo]

If you want to get an ellipsoidal shape (the only one I can get you) the escamotage is as follows:
Make the propeller you want, and make a block.
enter the block editor and explide the propeller (you will get a spline with the propeller's performance). close the block by saving it.
scale the block with different x-y (ownership, scale x - scale y)
You'll get an ellipsoid block with the propeller. Explode the block.
you will get a spline, with propeller pattern, consisting of a continuous spline.

 

[Riccardo76B]

Hi.
I have an idea, but I don't know if I understand your problem well.
So the first question I ask you is the following.
you with autocad can build a 3d model and export it to stl?
the second question is:
Would you just have a text file with g1 x y z movements to send to your pantograph?

Good morning victorious,
I could design a 3d model in autocad and maybe I could export it to stl via another colleague using other software. we have various pantographs of two different brands, but for both it would not be enough of the commands g1 x y z; they need dedicated post processors.
Thank you.

 

[Riccardo76B]

If you want to get an ellipsoidal shape (the only one I can get you) the escamotage is as follows:
Make the propeller you want, and make a block.
enter the block editor and explide the propeller (you will get a spline with the propeller's performance). close the block by saving it.
scale the block with different x-y (ownership, scale x - scale y)
You'll get an ellipsoid block with the propeller. Explode the block.
you will get a spline, with propeller pattern, consisting of a continuous spline.

Good morning crystal,
I probably mistake something but I can't climb with different x y. autocad use 2016 but I can't change the spline of the ellipsoid propeller. Do you know where I can go wrong?
Thank you.

 

[Cristallo]

the only way is to blow up a block previously scaled differently on the two axes.
Did you try to follow the steps I proposed?

 

[Riccardo76B]

ok, I used the inserm command and from them I managed to scale in different way the block in x and y. now at least in the possible processing you can manage also the ellipses. (among other things I also saw where you said to climb into property that I had not seen before). If they had to jump out particular or asymmetries to work, the only alternative I know will be to draw many lines and connect them as best as possible. Thank you very much

 

[Cristallo]

Please, figure

 

[Tristus]

The only way is the one described by crystal.
I looked everywhere but it seems there is no lisp able to make an ellipsoidal propeller. and yet the inputs would be only 5: the greater radius and the smaller radius of the first ellipses, and below the greater radius and lesser radius of the second ellipses. and height.
probably it is very complicated if the 2 ellipses were not proportional to each other (perhaps even impossible). but between 2 equal ellipses, one at a certain scale and the other at a different scale, should not be too complicated

 

[Riccardo76B]

Thank you so much