3d Runner in Mold Cavity

[g huns]

It's amazing how something as simple as a runner can kick my butt. Maybe not quite as smart as I though . Anyways I put a file in the MC9 folder on the ftp called runner.mc9 if any of yous are bored, have a look and let me know how you would cut the runner in this block. I don't really like how surface-contour does it or scallop either. It looks like flowline would be smooth, but that never does quite what I think it should do. Tried offsetting the edge curves to the runner center line and doing 3d countour but it cuts to deep in a couple of places. Those were my ideas any of yours would be welcomed. Thanks

[g huns]

Check that, arunner.mc9 is inside of

a runner.zip.

[Thad]

I would try a surface-project-blend. You'd need 3 toolpaths to do it, since you'd want to stay perpendicular to the form. It would end up cutting like a parallel path. One would cut the area that runs off the part, the next would cut the longest part, and the last would cut the little leg.

 

Thad

[Eeyore-nonhuman forum member]

Iskander teh Owl made once a runner for Lars .

Check it out .

http://www.emastercam.com/cgi-bin/ultimate...ic;f=1;t=008438

 

HYLI

[Lars Christensen]

And it worked GREEEEEAAAAAAAAAATTTTTTTTT

 

Thanks again Iskander

 

 

Lars

[Fred @ Slate Industries]

I just use contour.

If there is any elevation change MC will

pick it up and toggle the toolpath to a 3d contour.

*Edit*

It won't let me upload, so i'll email it to you.

Tony

[mig]

Hey Tonny!

To use contur ....? Hmm....

Don't foget your ball cutting by tip.

I would like to look Iskander's tip. Cannot get in now.

Regarsd

[Eeyore-nonhuman forum member]

~~~~~~~~~~~

Don't foget your ball cutting by tip.

~~~~~~~~~~

Not a must.

You can compenste to center and in this case just build proper geometry and it will give better results.

I use it in other cases and used in the days of programming on controller (Pencil-cam ) .

[g huns]

When cutting by tip and I would either have to use a depth of -.125 or leave -.125 stock in Z, correct? When I do this and verify on a stl of the block it digs in kinda deep in a couple of places. When I comp to center it works fine. Thanks to all.

[Müřlıń®]

g huns try this...

 

 

This finish strategy will work on any 3-d model and give very good results with minimal polish required.

 

after the roughing.......

 

Filter .001 use arcs in all 3.

use clearance and retract abs on all

 

Make a top surface and include it in drive surfaces.

 

Boundary on the edge, tool on.

 

Surface Finish Contour .005 step, no shallow, one way, depth (limits= inc .01,.01 important), optimize checked_no minimize, gap distance=1

ramp .25

 

Surface Finish Shallow .01 stepover, CCW, from 0 to 40 degrees slope, inside to outside, gap = distance 1.000, depth limits= abs -.01, -3.00,

3-d collapse.

 

 

Pencil climb......

 

This works and is Soooooooo easy

[Eeyore-nonhuman forum member]

Murlin,his runner is best to make using contour or project contour toolpath on surface or something similary simple ,cause it is actually a trace of ball mill rad 0.13 over slopped surfaces

I looked on his file yesterday .

I myself would have made simle contour toolpath with tool

height compensated to the center in this case .

 

Best regards

[Müřlıń®]

While not the very best strategy to use, the strategy I laid out will work on ANY 3-d model for finishing. It all depends on how accurate you intend to machine your model.

 

It will work every time without thinking about it and will give very good results with minimal polish.

 

quote:

---

trace of ball mill rad 0.13 over slopped surfaces

---

The overcut of contour over the shallow sloping surfaces will not happen because of the .01 depth limits set in the surface/finish/contour.

 

Setting depth limits will cause a slight error and leave wall stock but most of the molds I machine have 7 degrees draft or less. 7 degrees TAN x .005 is very small.....

 

In this cast the walls on the runner are around 15 degrees I think and will leave only .001 stock on the walls.

 

The 40 degree slope on shallow should take care of most of the extra stock left over by the .01 depth limits set in the contour.

 

After all it is a runner and the strategy I used is not for a no polish scenerio or trying to hold + or - .001.

 

The accurate no polish scenerio requires a strategy like you have laid out.

 

Merry New year Bro

[g huns]

Murlin could ya send me or post on ftp a sample mc9 file of what you're explaining. I limped through and got my stuff cut but I didn't really like it and tore up some cutters in the process. Thanks for the suggestions guys and have a Happy New Year.

[Jack Mitchell]

I would tend to agree with Murlin on this but you need to keep in mind what the purpose of the runner really is – the collection of volume has little to do with final finish and more to do with the indirect since it gets trimmed off in the process for a remelt anyways.

I also agree that there is more to this than meets the eye. Aluminum injection – don’t you just love it.

 

I would shoot the runner in 2-D and taper with a 15 Deg draft mill myself, but it's really up to you.

 

 

Regards, Jack

[Müřlıń®]

quote:

---

Murlin could ya send me or post on ftp a sample mc9

---

Murlinrunner.mc9 in the mc9 folder on the FTP.

Since it is a runner I left off the pencil...

 

quote:

---

Aluminum injection – don’t you just love it.

---

Possibly...I was thinking Zinc Yer right though, gotta love those diecast molds......haven't built one of those in 20 years......

[Müřlıń®]

update patch......

 

You will want to set the depth limits on the Shallow from -.03 to -.06, to remove 3 unwanted top passes....

[PE @ IHS]

Hi Murlin

 

Thanks for sharing those specs. Though there is no such thing as a "perfect 3D strategy" that suits all parts, the approach that you detailed is a pretty good way to attack to most 3D parts and is quite effective.

[Müřlıń®]

yw Peter. I did make one more change that I forgot to mention. Had to set the gap to .5 on the Shallow, because the tool ran across the face in one area.

 

[ 01-03-2005, 09:45 AM: Message edited by: Murlin ]

[wildcat99]

What kind of systems/settings are you guys running? I opened up ghuns' file, but when I go to Main Menu Toolpaths I never could get the Operations Manager to open.

 

I'm running Windows2000 SP2, Pentium4 1.70Ghz and 512K RAM. Allocations are 130K database and 120K toolpaths with a Matrox Millenium G450 card.

 

Any ideas? Thanks.