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bmarkeyJ44PH
369 Vistas, 4 Respuestas

Unable to mill tapered pocket(groove?), never finishes to bottom.

Trying to mill a long groove with a 15 degree taper on each side, and a small radii at the bottom. We seem to be getting the same issue no matter how we try to do it.  It will rough to a certain point with a flat em, then stop, which makes sense.  It will attempt to finish with the taper but it never goes full depth.

 

I'm guessing it has to do with doing it as two sides?  I would have assumed a final pass down the center since the taper mill has the same end radius.

 

The best luck so far has been with draft angles as seen in the attached doc.   I have a solid model but surface milling makes a total bodge of it, plus the run time exponentially longer. 

 

Is there a better way to do a feature like this? 

 

Thanks

Bruce

 

Etiquetas (1)
  • taper
bhorstTGM48
en respuesta a: bmarkeyJ44PH

I redefined a tool to match your side wall profile. See if this is what you want?

bmarkeyJ44PH
en respuesta a: bhorstTGM48

Ok, I can order new tooling yes, I was trying to use what was already ordered by someone else.  I think I was more confused as to why a tapered endmill with a more acute angle wouldn't be able to mill this since there would be clearance, as you'd use a radius tool to do a draft angle.

 

Full disclosure, this is the first time I've used tapered endmills with FC, and I really just assumed there was some setting I was missing.

 

I can get it to work if I do each side independently and just constrain its stock, though that seems like the long way around.  Plus I had to force it to finish decently with z increment, as I think that "Radius tool scallop height" under finish is ignored by the tapered endmill.  I have to do some more testing to see if that holds up.

 

Either way,  I'd still be curious to know the acute angle part of it.

 

Thank you.

Bruce

 

 

 

qpeturnKVRK6
en respuesta a: bmarkeyJ44PH

Hi Bruce, 

                is the tip of the tool the same or smaller than the bottom of the tapered groove.

 

John.

bmarkeyJ44PH
en respuesta a: qpeturnKVRK6

Yes,  the tip is the same size as the bottom of the groove, .0625 in this case.  

 

Actually I changed it a small bit, changed bottom radius to .039 in hopes that might help.  

I have it to almost finished but no matter what I do I can't get a finish pass to go to the full depth.  

 

I wrote a quick program to rough with the 10d taper down to .765 which is almost final depth, .769.     Every finish operation I try doesn't want to go lower than around .695.