Tabs creating seams

[Anonymous]

Hi everyone,

I seem to be having a problem regarding the creation of tabs. At the moment, when I have tabs they create a strange seam that I can't seem to get out (other then post-producing of course).

Attached a picture of what happens (this is after sanding it already quite a bit) and the f3d file. 

Thanks in advance if anyone is able to help!

Philip

[Anonymous]

And if it helps, here too is the NC file generated.  work with a CNC Step High-Z and I control it via KinetiC-NC

[Anonymous · Accepted solution]

This showed up in recent weeks in another thread, problem with rectangular tabs.

Tool under load of cut deflects from stock, when it encounters tab, it stops progressing in X or Y direction and loses the load, while moving up in Z axis it leaves mark because it is no longer deflected due to cutting pressure.

On the other side of tab tool plunges into solid stock and vibrates because it works as a drill bit for duration of the cut between top and bottom of tab.

Select triangular tabs and problem will go away because tool will not stop at the top of tab, it will feed in XZ or YZ direction over tabs, up in Z axis to the middle of tab then down in Z over other half while feeding in X or Y axis at the same time.

[Anonymous]

Thank you very much. This will certainly help!

[richardfferraro · Accepted solution]

I am currently cutting in mdf. This is a problem that others have helped solve.

I want rectangular tabs.

This works for me. No more ghosting and nice surface finish.

The big contributor is Sideways Compensation Right (conventional)

Tool

Choose tool (mine is 1/4")

Coolant Disabled

Spindle Speed 13000

Feed rate 1400

Geometry

Tabs 6.35 1.5875 selected

Heights

Bottom Height Offset -0.5

Passes

Sideways Compensation Right (conventional)

Multiple Finishing Passes off

Stepover .635

Finish Federate 1400

Roughing passes checked

Max stepover 6mm

Smoothing deviation .1mm

# stepovers 1

Multiple depths checked

Maximum Roughing Stepdown 5mm

Finishing stepdowns 0

Finishing stepdown 0.2

Approach Along wall

Rough Final checked

Order by islands checked

Linking

High Feedrate Mode Preserve rapid movement

Allow Rapid Retract checked

Safe distance 5mm

Keep tool down

Maximum stay down (200)

Lead in checked

Horizontal Lead-in .635

Lead in Sweep angle 0

Linear lead in .635

Lead out checked

Lead out same as lead in checked

[Anonymous]

Thanks. Will definitely try that as well!