Well I had my first exsperience using the tru-mill function today and i was extremely impressed. The part i was cutting was 15-5 stainless heat treated to aprox 46HRC. I used Tru-mill on a slot that was 1.575" deep 2.210" wide and 36.0" long. I used a 43 degree engagment angle feeding at 100 IPM with a .750" carbide e/m at 0.7875" D.O.C with air blow only. The tool ripped thru the material like it was aluminum and by the time word got around everyone in the shop was coming by to watch it run. Our other programmer who uses master cam told me he had "toolpath envy" after seeing how nice it cut.
Its been along time since ive been impressed by something in a shop but this sure did it.

It is TrueMill not Tru-Mill

Mastercam should have the Adaptive Clearing available as an add-on. If you believe the developers of that (www.freesteel.co.uk) it's as good or better than surfcam truemill. Some amusing posts about patents and surfcam in that blog :)

Anyway, it would be useful and interesting if people with true-mill could post some screenshots of the toolpaths!

Well I had my first exsperience using the tru-mill function today and i was extremely impressed. The part i was cutting was 15-5 stainless heat treated to aprox 46HRC. I used Tru-mill on a slot that was 1.575" deep 2.210" wide and 36.0" long. I used a 43 degree engagment angle feeding at 100 IPM with a .750" carbide e/m at 0.7875" D.O.C with air blow only. The tool ripped thru the material like it was aluminum and by the time word got around everyone in the shop was coming by to watch it run. Our other programmer who uses master cam told me he had "toolpath envy" after seeing how nice it cut.
Its been along time since ive been impressed by something in a shop but this sure did it.


What was your spindle speed and what brand of carbide and number of flutes (Hanita, OSG etc). I would like to try on 15-5, 17-4 and Vasco.

I was running the spindle at 3800 RPM, the tool we were using was a custom ground and coated 4 flute E/M, anything like a data flute or anything with at least a 38 degree helix would work just fine. I found that the coated tool would last at least twice as long.

I was running the spindle at 3800 RPM, the tool we were using was a custom ground and coated 4 flute E/M, anything like a data flute or anything with at least a 38 degree helix would work just fine. I found that the coated tool would last at least twice as long.

Thanks SWPM I will try those parameters with a .750 EM. Do you have any numbers you can suggest on 1" carbide end mills.

I have one job in the shop running a standard 1.0 carbide e/m (un-coated)
running at 6000 RPM and feeding at 200IPM with a .785 depth of cut and using 48 degree engagment angle on heat treated 15-5. Every time I have used true-mill I have had to adjust the feeds and speeds based on the features of the part.
I also just finished running a titanium part using a .250 carbide E/M cutting
.560" deep pocket with 2 bosses at a 50 degree engagment angle at 6750 RPM and F90.0 and the full .560" depth of cut . I couldnt beleive how well it worked and the cutter still looked brand new after it was complete.

I have one job in the shop running a standard 1.0 carbide e/m (un-coated)
running at 6000 RPM and feeding at 200IPM with a .785 depth of cut and using 48 degree engagment angle on heat treated 15-5. Every time I have used true-mill I have had to adjust the feeds and speeds based on the features of the part.
I also just finished running a titanium part using a .250 carbide E/M cutting
.560" deep pocket with 2 bosses at a 50 degree engagment angle at 6750 RPM and F90.0 and the full .560" depth of cut . I couldnt beleive how well it worked and the cutter still looked brand new after it was complete.

Wow...That is impressive.. Question are you a programmer. If so I would like to know what your fee would be to program a job for me. Are you using Velocity III or version II. I have a seat of version II but the part I need programmed has 3D surfaces. Last question: Do you have any videos of the parts that you have run. Are any posted on the Surfcam site.

Truemill, I checked the website, watched some video, it looks great, but only for pocketing

You can use it just like srm now. You can use it to rough 3d and switch to the smaller tools to clean up the steps that are left. works pretty good I think.

What was the machine and Taper?

By using both the part and material lines you can do external tool paths as well as pockets. I am doing most of my work this way now. Saves on tool life, time and a good finish. Using the wall finish for a final pass gives a great finish on the pieces that I am doing. I find more and more uses for it.:)

Eagle