Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Golfbuddy]

I am a total novice when it comes to this particular application. In fact, I would say that I am not even at novice level yet.  

I am trying to do something quite basic. All I want to do is draw a rhombus and be able to manipulate the dimensions to see what effect this will have on the other dimensions.

I then need to be able to see the rectangle that the rhombus will fit into to enable me to feed this information into a CNC cutting table which will cut a sheet of material to the dimensions I have entered.

Sounds simple but then so am I.

I know there must be someone out there who can point me in the right direction.

Martin  

[cem_devecioglu]

CNC cutting table algortihms are recursive and really complex..
(for automated systems)

Autocad is so far..

This much I can say :-/

[bob.dent]

I am a total novice when it comes to this particular application. In fact, I would say that I am not even at novice level yet.  

I am trying to do something quite basic. All I want to do is draw a rhombus and be able to manipulate the dimensions to see what effect this will have on the other dimensions.

I then need to be able to see the rectangle that the rhombus will fit into to enable me to feed this information into a CNC cutting table which will cut a sheet of material to the dimensions I have entered.

Sounds simple but then so am I.

I know there must be someone out there who can point me in the right direction.

Martin  

'nuff said Martin.  

[Golfbuddy]

I am a total novice when it comes to this particular application. In fact, I would say that I am not even at novice level yet.  

I am trying to do something quite basic. All I want to do is draw a rhombus and be able to manipulate the dimensions to see what effect this will have on the other dimensions.

I then need to be able to see the rectangle that the rhombus will fit into to enable me to feed this information into a CNC cutting table which will cut a sheet of material to the dimensions I have entered.

Sounds simple but then so am I.

I know there must be someone out there who can point me in the right direction.

Martin  

'nuff said Martin.  

Cheers Bob, go and burn your burgers.  

 

[Martin_1962]

What material?

I'm afraid my only use of Autocad is reading the DXFs.

If you have a shape package you could get the coordinates off it and use them.

Hand coding DXFs is scarey mind you!!

[Bo Bo]

I used to do this when I was an apprentice, can't remember any of it now.....

[Golfbuddy]

What material?

I'm afraid my only use of Autocad is reading the DXFs.

If you have a shape package you could get the coordinates off it and use them.

Hand coding DXFs is scarey mind you!!

No Martin, I can't use the shape package in ALFAK, as this is what I need to put the info into. As you know, this package needs to know the rectangle parameters and then the deductions for the rhombus.

I have site sizes but these do not give enough information for the NC cutting table to work with.

The bottom line is I have the size of four sides and the four angles I could work the sizes out with 'trig' but, seeing as there are 32 different pieces of glass, I was hoping that I could plot the shape in Autocad and then just change the sizes to redimension each piece. I know it can be done, I just don't know how.  

[cem_devecioglu]

What material?

I'm afraid my only use of Autocad is reading the DXFs.

If you have a shape package you could get the coordinates off it and use them.

Hand coding DXFs is scarey mind you!!

No Martin, I can't use the shape package in ALFAK, as this is what I need to put the info into. As you know, this package needs to know the rectangle parameters and then the deductions for the rhombus.

I have site sizes but these do not give enough information for the NC cutting table to work with.

The bottom line is I have the size of four sides and the four angles I could work the sizes out with 'trig' but, seeing as there are 32 different pieces of glass, I was hoping that I could plot the shape in Autocad and then just change the sizes to redimension each piece. I know it can be done, I just don't know how.  

this question come in front of me as a programmer..

After a bit of search I understand its really complex ..As there are thousands of combinations depending on the shapes,sizes and the area itself for optimization..There are recursive algorithms that make trial and error even with some ready formula..

Not a kind of short job..I quit

[cem_devecioglu]

something like this..

http://portal.acm.org/citation.cfm?id=1007782.1007794&coll=&dl=

[Golfbuddy]

something like this..

http://portal.acm.org/citation.cfm?id=1007782.1007794&coll=&dl=

Not really.  

More like this.  

[media]http://www.youtube.com/watch?v=FhcILzESEfQ[/media]

[Martin_1962]

Don't know Alfak that well, but doesn't it do custom shapes for polygons?

PM me the dimensions if you want

[cem_devecioglu]

yep..understood..straight autocad job..any architect neighbours ?

[Martin_1962]

We have a rather good shape package - and we could run the dimensions through it.

[RossPhim]

I am a total novice when it comes to this particular application. In fact, I would say that I am not even at novice level yet.  

I am trying to do something quite basic. All I want to do is draw a rhombus and be able to manipulate the dimensions to see what effect this will have on the other dimensions.

I then need to be able to see the rectangle that the rhombus will fit into to enable me to feed this information into a CNC cutting table which will cut a sheet of material to the dimensions I have entered.

Sounds simple but then so am I.

I know there must be someone out there who can point me in the right direction.

Martin  

What you need is something a bit more advanced than just basic AutoCAD. You need something that can be parametrically driven i.e. you change the dims and the shape automatically adjusts for you.
You need some 3d modelling software, and if you want to stay with an Autodesk product you should be looking at either Mechanical Desktop or the Inventor package.
I used to be a draughtsman, then moved on to 3d-modelling (oil related), and now lead a small team of draughtsmen/women in the water industry.
If you want any further help please feel free to drop me a PM.
Regards
RossPhim

[Bandit127]

The answer is complicated because the question is complicated.

A rhombus is a diamond that has opposite sides that are parallel. Every side is the same length. http://en.wikipedia.org/wiki/Rhombus

Do you mean a rhombus - or a more random diamond like shape? If it's the latter and you don't have Desktop or Solidworks I would draw up lots of different versions in AutoCAD and calculate empirically.

If it IS a true rhombus I would use Excel (or open sauce equivalent). Imagine drawing a line between opposite corners. You then have 4 right angled triangles that the sides of which define your rhombus and rectangle. Easy to do in Excel then. [edit] Then draw up in CAD for the CNC file if you have CAD/CAM [/edit]

Hope this helps.

Jim