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Roughing sequence and plunge feed

Level 7

Roughing sequence and plunge feed

Dear all,

When using the roughing sequence to rough a pocket I see there is no option to enter a plunge feed.

When using an end mill this is essential in order not to damage the flutes.

I've tried entering a ramp speed and specify explicitly a ramp angle of 90° (which is the default setting).

This has no effect on the resulting toolpath. The only feed applied is the default cut_feed.

2017-04-20_11-02-40.png

The volume rough sequence does have this option but I can't use that sequence for this particular toolpath.

2017-04-20_11-04-06.png

Is it possible to specify a plunge feed with the roughing sequence ?

   John
   KU Leuven - Technology campus Diepenbeek

7 REPLIES
Level 9

Re: Roughing sequence and plunge feed

Hi John,

If you are using the new volume milling sequence you must then specify the entry type defined to ramp as image below. With the old volume milling you just have to specify the ramp angle and speed and Creo understands you want a ramp entry ! By the way I'm still not using the new volume milling sequence as I don't find it very "logical" !

Level 7

Re: Roughing sequence and plunge feed

Merci beaucoup pour votre response.

I've now found that the new "roughing"-nc sequence, the one that uses a faceted model internally and which is the one I'm referring to, has a slightly different option set (in Creo 4 M010) as can be seen in the following screenshot.

2017-04-20_15-24-53.png

Although I have now specified RAMP explicitly and specified a RAMP FEED (see the following picture)

I still no see a different feed in the cutter location file with respect to the first entry

   John

   KU Leuven - Technology campus Diepenbeek - CAD2CAM  

Level 8

Re: Roughing sequence and plunge feed

It works on my System with Creo4.0 M10

in roughing If I specify a ramp feed different from the cut feed it shows as different. But it is not a straight plunge it is a helical cut into the part.

rough_ramp.jpg

Here is the code output with the feed at 50 as specified in the ramp_feed  parameter.

roughing tool path code.jpg

Here is what it looks like again it is not a ramp as you would think. it's an odd helix even though I have it set to ramp.

rough_toolpath.jpg

roughtoolpath2.png

Level 11

Re: Roughing sequence and plunge feed

I've not used Creo 4.0, but it looks like you are using a spiral path, and the helix entry is the spiral version of a ramp. Note the pitch of the helix tapers constantly as it descends into the part. Kind of cool, but I wonder if it is possible to customize the way it is done. I.e. could you increase the number of coils in the helix so it is a more gradual cut into the part.

Level 8

Re: Roughing sequence and plunge feed

Ken,

that is how I normally enter a pocket with a 7 degree tangent_helix and a helix diameter to the bottom with stock. then the helix is a constant spiral into the work. this is also available in Creo3.0 roughing and volume roughing.

rough_helix.png

rough_helix_sample.png

Level 11

Re: Roughing sequence and plunge feed

I am definitely going to have to give this a try for those situations where I can't avoid plunging into a pocket. I avoid bottom cutting as much as possible, but sometimes you're stuck with it, and a drill doesn't do the whole job of "starting" the path...

Level 8

Re: Roughing sequence and plunge feed

Ken,

This method works very well for pockets. no drilling of start holes just helix into the cut and go. Pretty efficient too. as you can see there are very few retracts until it get to the outside then I have the retracts set to .025 above the cut portion.