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Thread:
collett strikes: caused by incorrect cutter inform
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amstanley
2018-09-12
21:44 CEST

I am machining a model and experiencing collett strikes.
Collet collision detection is enabled.
I speculate it may be cuased by incorrect cutting tool information.
There is little information in the manual so I am checking here.
specifically, can we clarify the definitions of 'free length' and 'cutting length'?

The cutter I am using is like the one in the attached picture.
The total length of the shaft is 40mm.
The length extending from the collett is 25mm, from the upper edge of the green ring downward.
the flutes extend for 20mm, from the lower edge of the green ring downward.

In this case, I have entered the following:
free length = length of shaft = 40mm
cutting length = flute length = 20mm

I suspect this is incorrect and the definition of 'free length' is actually the part extending from the collet, in this case 25mm instead of 40mm. Can you confirm this?

the collett strike is happening on a vertical surface.
In the config 'check for vertical surfaces' is NOT enabled.
there are many vertical surfaces in the model and I do want them machined where possible.
What does 'check for vertical surfaces' do and when should it be enabled?

Thanks for your continued support.
it is most helpful.

Lex
2018-09-13
09:29 CEST
Hi Malcolm,

Thanks for including an image, which makes this conversation easier and more clear.
Your 'suspicion' is correct:
the Free length is the length of the part that extends from the collet, so for your cutter ca 25 mm.
And the Cutting length is the length of the part that actually cuts: for your cutter ca 10 mm.
You can also define the 'sloping part', where the cutting diameter changes into the shaft diameter (DeskProto calls this cutter a "multiple diameter cutter").

When you press the Help button in the cutter definition dialog you will get an explanation of all cutter dimensions, with a drawing that shows the meaning of each dimension.

The check for vertical surfaces does not solve this, it is meant to solve a different problem. Here as well: please use the help button for an explanation (which for this option is quite long, so I won't repeat it here.

Lex.

amstanley
2018-09-13
14:40 CEST
thanks for the clarification...
I will reset the parameters and try again...