Message 1 of 15
We often use SmoothFlow roughing with 20 mm Z steps with low density materials.
Paths are OK, but clearances are way too high, and do not seem relevant (much greater than Z step or security clearance). Thus, the clearance can be higher than our CNC max Z travel, without any real need.
Reducing the Z step solves the problem, as clearance seems more or less proportional to this value.
Here are 2 screenshots of the same part with a 20mm and a 10 mm Z step.
Sounds like a bug.
ZW3D 2010/ ZW3D 2013 beta 3
10 mm Z step
20 mm Z step
Message 2 of 15
Thank you for sharing this.
I have raised a few pcr's /ZDP reports on the issue, but no luck so far
Partly because these step sizes are not very common in the machining industry, I think
But in the machining of soft materials we use steps of 80mm and more.
You can imagine the required space around the product with that step sizes :-)
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Message 6 of 15
I'm Sam, from ZW3D support team. I'm very sorry for the late reply.
Concerning this question, I recommend you set the Long Link Type to "Optimized", please refer to the picture as below. If you set this option to "Clearance" that's means the retract distance always be Cleareance Distance+Step value+Thick value. Could you please try it in your computer again.
Message 7 of 15
Thanks for your reply.
This parameter was already set to "optimized", so no change. Changing it to "clearance" has no visible effect
Clearance is set to 160, higher than the part, step value is 20, and I get effective clearance at a little more than 190.
What is the "Thick value" you are referring to?
I do not want to post the file on the forum, but I can send it to support email, if you'd like to check it.
All the best,
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Message 11 of 15
Thanks, it's much better with 170 mm clearance instead of 190 mm. These 20 mm can make a big difference.
I do not know why the XY containment offset was 40% only for this part. At the time I created this CAM plan, I didn't have enough time to build clean templates. It probably came through pasting and copying from another part that required this particular value.
With 300%, which is our standard value in the newly created templates -and the value you used-, it works a lot better.
But how is this XY offset containment value related to Z clearance?
I have to admit I can't make the link and didn't have the idea to change this parameter.
Luurt, is your case similar to this one?
Message 12 of 15
Concerning the question about "But how is this XY offset containment value related to Z clearance? "I need talk about this question with our Amercian colleagues to get the point.
Here, I recommend you use the default value when create a new roughing operation.
Message 13 of 15
"Here, I recommend you use the default value when create a new roughing operation."
We now have templates properly built and based on default values, so getting a weird parameter using copy and paste from another part may not occur.
But I'm still interested by the answer to my question as we may have to use unusual parameters for specific parts and understanding this relationship will probably help identifying the best solution.
Message 14 of 15
Concerning my earlier post I have attached an example of the my clearance issue. We machine many curves, in this example the depth is constant so I can use a support surface and achieve the required depth. Which is shown in the operation 1. The chaining with .1" from the surface is what I want.
However most of our deco varies in depth based on one surface so I can not use a support surface. In this case, operation 2, all retracts go to the clearance plan, which is NOT very efficient. I know I could setup some extra planes but I think it should be much easier. The settings for each operation is the same except for a support surface.
Message 15 of 15
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