sample of 3d cnc wire forming cad drawings
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From CAD to CAM – do you work with a CNC developer? or maybe you are a CNC programmer!
Here are a few AutoCAD tips, tricks and tools that yous can use to clean up the 2nd geometry in your DWG files ready to bring into your favourite CAM programming software.
Place your geometry on a 'CNC' layer
Be nice to your CNC programmer. Create a Layer in your DWG file for CNC paths and copy the relevant geometry onto it. To make this piece of cake, utilise the 'COPYTOLAYER' command. Copying the relevant geometry to the correct layer is a simple as betoken and click.
Flatten
Geometry that does not accept a Z coordinate of Nada, when information technology really should do, tin massively confuse the CAD to CAM process. You can employ the 'FLATTEN' control to set all the Z coordinate values to '0'.
'Flatten' is an AutoCAD express tool, so it isn't available to AutoCAD LT users. If y'all are using AutoCAD LT, you tin use the backdrop palette equally a detective tool to help you come across what'southward going on.
Type 'PROPERTIES' at the command line to open the properties palette. Select each entity you are having a problem with, and check out its properties.
For lines, check that the Z value of the start and cease points is set to 0 (Zero). For 2nd polylines make sure that the pinnacle is set to 0 (Zero). For splines click in the 'Fit Points' cell and employ the frontwards and backward arrows to step through each fit signal, making sure that the Fit point Z is ready to 0 (Nix).
(click on the images for a larger view)
Overkill
CNC machines don't like overlapping geometry. This tin cause them to go back and forward over the same area needlessly.
'OVERKILL' was an AutoCAD express tool that has now been included in the primary production. The 'Overkill' command removes redundant geometry in the following way.
- Duplicate copies of objects are deleted.
- Arcs drawn over portions of circles are deleted.
- Lines, partially overlapping, but drawn at the same angle are combined into a single line.
I take establish that it is better to run each option of the overkill command individually for the best results. You lot may need to play with the tolerance a fleck until you become the results you are looking for.
Convert splines and ellipses
CNC machines don't like compound curves such as ellipses and splines. CNC machines like polylines – which can only include line and arc segments. Yous will need to convert splines and ellipses into arcs earlier y'all can join them up into a polyline.
In AutoCAD 2012 you can at present convert a spline to a polyline using 'SPLINEDIT'.
- Select the spline to convert.
- Enter p to catechumen to Polyline.
- Specify a precision value or press Enter to end the command.
In tests, we have found that our CAD to CAM software does this ameliorate than AutoCAD. Only this is even so a useful tool for those who don't have some other option.
At that place are a number of other ways that y'all tin convert Splines and Ellipses to polylines. You lot can read more well-nigh it in this mail on converting Ellipses to Arcs.
Polyline, fuzz distance
CNC machines don't like geometry that nearly, but doesn't quite join up at the corners. By turning your lines and arcs into polylines, you can be sure that the corner junction points are spot on. If the polyline won't join upwardly, y'all have identified a problem that needs fixing.
A quick way to join multiple lines into ane polyline is with the 'PEDIT' command. Type 'pedit' at the command line, then immediately chose 'Thou' for multiple object pick. Select all the objects yous want to join, and so type 'j' for the join option.
Y'all will exist prompted for a 'Fuzz' Distance'. This is the margin of error between lines that overlap, or don't quite join. Set this higher than your biggest overlap/gap and AutoCAD volition join all your lines together in 1 fell dive.
Tip: If you get an abrasive prompt that says 'Do you want to convert these lines to polylines' set the 'PEDITACCEPT' system variable to 'one' to suppress it.
Fillet nix
If you are looking for a petty more than precision, try the Fillet command. The fillet command has a hidden option which is cracking for joining up corners.
Type 'FILLET' at the command line to start the fillet command. Don't worry well-nigh the current fillet radius that is shown. Just hold your finger down on the shift cardinal and pick two lines. Bingo, bango the lines will be joined neatly at the junction.
Holding down the 'SHIFT' key temporarily overrides the current value of the fillet command with '0' (Zero) which will effectively trim/extend each line or arc to each other in one functioning. As a bonus, if one or other of your entities is a polyline, the other entity will automatically be converted to a polyline and added to it.
Select touching objects
Sometimes your lines merely don't want to connect up into Polylines, and it can be difficult to tell where the problem is. A quick way to tell where the problem intermission might exist is with 'FASTSEL'. Fastsel is an limited tool, that prompts y'all to select one object, and information technology and so selects whatever items that are touching that object.
FASTSEL has two modes. To change modes type 'FSMODE' at the command line, and select 'off' or 'on'. With FSMODE set to 'on' AutoCAD will at present select every item that is touching every item that touches the particular you select… ad infinitum.
Tip: you tin use FSMODE 'transparently' (i.eastward. while in the centre of some other command) by typing 'FS at the command line, note the single quote marking before the command alias.
Export DXF
If y'all just need to export part of your drawing out to a DXF file for CAD to CAM, you can do this with the top secret options in the Consign DXF command.
To make us of this, type 'DXFOUT' at the command line, so pick 'Tools' and then 'Options' from the 'Salve Drawing Every bit' dialogue that pops up.
In the 'Saveas' options dialogue option the 'DXF options' tab, and check the 'Select objects' box. Striking OK. When you lot return to the 'Salvage Drawing As' dialogue, set your file name and path as usual. When you striking OK, yous volition exist prompted for a option set. Only the geometry you select will be exported.
Chspace
'CHSPACE' is a very handy control for moving geometry between model space and paper space. You need to be in paper space for this to work. Type 'CHSPACE' at the command line, pick an object, choice a viewport, and the geometry volition be 'pushed' through the viewport into model infinite. The control volition even calibration the geometry by the viewport scale automatically.
To motion objects in the opposite management, offset off in newspaper infinite and double click in a view port to make information technology active . Now run the 'CHSPACE' command and select the geometry you wish to movement. It will be 'Pulled' through into paper space and scaled for you.
Insert views and export layout model infinite
If you have a .DWG file that has been created with Autodesk Inventor, you lot may observe that all the geometry is in paper space. The Inventor views are actually in a magic hinterland somewhere between paper space and model space. However, all the Inventor views are available in the cartoon file as blocks.
To get to the Inventor views use the 'INSERT' command to insert the view into model space every bit a block. You can also browse the bachelor blocks that are in the drawing via the Design centre. You volition need to explode the blocks once you've inserted them and you may need clean upwards the geometry a bit.
For more on this tip, cheque out this post on How to extract 2D AutoCAD geometry from an Autodesk Inventor DWG Drawing File.
For a quick way to put the whole layout into model space, employ the 'EXPORTLAYOUT' command to consign the unabridged layout into model space in a new cartoon. If you do this, don't forget that you may need to scale the geometry upward or down a bit to suit the view scale.
Rounding up CAD to CAM
Drawings are quickly condign only one of our deliverables. Oft a 3D model or 2d geometry is as well required for CNC or CAM processing down the line. Creating skilful clean DWG files is rapidly condign part of your job.
Can y'all think of whatsoever other processes yous use to clean upwards and extract your geometry for CAD to CAM or CNC programming? Please experience costless to leave a annotate…
Read this post for more ways tooptimize your AutoCAD DWG drawing files.
Source: https://cadsetterout.com/autocad-tutorials/cad-to-cam-cleaning-up-dwg-files-for-cnc/
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