5 axis tool marks

[ProE_5_Axis]

I wish I discovered MCAD Central earlier!


I am getting tool marks from what seems to be a bad motion at the interface between two surfaces. The tool does a full round around a blade-tip and then a weird motion before continuing on to the blade surface. The marks are no more than a 0.001-0.002" but they weren't there when using axis definition (which Ihave since hadto give up for this sequence).


Any similar experience or suggestions?

 

[appinmi]

Make sure that the two surfaces are as "tangent" as can be. This will give a smooth transition between surfaces. If you cannot alter the model, you might try machining them in seperate sequences.

 

[ProE_5_Axis]

Thanks AllanP


The surfaces should be tanget because they are joined with a full round. Also, breaking the two surfaces off into two sequences caused tool marks from the pullout at the interface. Could it be a tolerance issue? I am using LIN_TOL parameter set at 0.002 for the sequence. Would loosening this up help to blend the cutlines?


It is frustrating because the tool marks were not there when I did the sequence using datum axis. There has got to be a way...

 

[appinmi]

I am using Wildfire 1, and I do not have a LIN_TOL parameter. I do have and use the TOLERANCE ans SCALLOP_HEIGHT parameters. Usually my TOLERANCE parameter is set to .001 or less. Maybe you need to set your tolerance tighter, so it doesn't gouge the part.
Edited by: appinmi

 

[S:B:C]

How many cutlines is used in the seq?. Try to add intermediate cutlines for the entry and exit of the round. If this doesnt do the trick. try to add sync curves in the troubled area.

 

[chf65]

Hi ProE_5_Axis,


From your 1st posting, it looks to be happening where you have a large rotary move and a small linear move. Linearization is a good bet to where the problem is, especially that you say that the gouges are <.002", which is OK since you only ask for LINTOL of 0.002


I suggest you tighten LINTOL and try again. This will certainly give you a much bigger program, but you should get closer to you geometry where you have these tight move.

 

[marker4x4]

Hi ProE_5_Axis,


From your 1st posting, it looks to be happening where you have a large rotary move and a small linear move. Linearization is a good bet to where the problem is, especially that you say that the gouges are <.002", which is OK since you only ask for LINTOL of 0.002


I suggest you tighten LINTOL and try again. This will certainly give you a much bigger program, but you should get closer to you geometry where you have these tight move.

Ditto to that, I used to have my LINTOL set for .0001. Try that and please let us know if it worked.

 

[Heathbn]

I think the best way to fix this problem is not to change the model butthe surfaces that you are using to cut the model.


Simply put use approximate curves to recreate the surfaces into one continues surfacesthis will eliminate the transition you are having to deal with.

 

[design-engine]

What

 

[ProE_5_Axis]

thanks chf65 and marker4X4,


LIN_TOL did not solve this particular issue, though it did solve another issue we were having (we had to go to a LIN_TOL of 0.00001!!). The surfaces cannot be the issue here as there is a full round at the top of the blade; insuring tangency as far as I am concerned. Our solution at this point is to break the round and blade surface millingout into two different sequences.


Thanks for your help

 

[Heathbn]

If you send me the model you are working on I will put the curves in so that you can machine it as one surface insuring a good blend.

 

[chf65]

Hi ProE_5_Axis,


Another possibility for the gouges at the leading edge is feedrate. Are you using inverse feed?


If not, it means that your rotary/linear axes moves are not synchronized, and as the rotary moves get bigger relative to the linear moves, the problem gets more noticeable.