Ridges on finish with 1/4" down cut

[jkcreative]

Hello all,

I am having a problem with my 1/4" downcut leaving ridges during cutting. I am running a Morbidelli author 636, Xilog Plus (PanelMac) and Alpha CAM. The two with the more defined ridges were experiments with feed rates, the one with less defined ridges was run at 20% speed using the controller on the machine. Spindle is at 18000 RPM. The bit is an onsrud 1/4" down spiral.

I was running at +9.00 in/min and dropped down to +3.00 with no noticeable change.

Sorry if it's hard to see from the pictures but that was the best I could do. Can anyone help me?

The material is MDF, but these marks also showed up on laminate.

Thanks so much




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[ger21]

I have the same machine here. I'd recommend doing a finishing pass, if the finish is critical? About .01", at a slower speed.
You might try a 3 flute tool, which might cut a little smoother.

[RCaffin]

I don't have a lot of experience with MDF, but that sort of looks like chatter, from either backlash in the drives or loose bearings in the spindle. But that is just a guess and could easily be wrong.

Cheers
Roger

[ger21]

It's a several thousand pound machine with a 10-15HP spindle.
What it is is deflection. If possible, try using a 3/8" tool, and you won't see that.

[RCaffin]

Deflection in the tool rather than in the frame? Blimey!
Which is why we don't take such deep cuts in metal I guess.

Cheers
Roger

[lancut]

Make first rough cut using conventional pass,leave about 0.015". Then comeback with finish cut using climb method..

[streetrodlover]

Also make sure your material is secured properly and you have no run out in your spindle

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