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 Post subject: 3D CUTTER COMP
PostPosted: Tue Nov 08, 2005 7:25 pm 
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Here it is:

I use cutters that are toleranced at -.001 sometimes the .125bem will be .1236, so here is the DILEMA:

While my Makino is running on a job, I like to program ahead, well I cannot do that with these loose tolerance tools because they flucuate so much, holding .0002 is a bitch, so I have to wait till the program in the machine is done so I can measure my next set of tools.
WAIST OF TIME!!!!

Does 3D cutter comp work? and would it work in this case?

3D Cutter Compensation - when On the specified toolpath is created with the contact normals details in it. This is essential when the machine tool does the 3D cutter compensation and PowerMILL outputs i, j, k vectors in the tape file. To turn 3D Cutter compensation on for all toolpaths simply select all the toolpaths in the list and then select a Radius of 3D and check the Contact Normals option in the Calculation frame on the Tools - Options - Toolpath dialog.


WHAT?


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PostPosted: Tue Nov 08, 2005 9:03 pm 
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3D cutter or 5-axis compensation is an option in the control. It is very easy to program. It works very well with point to point data.

On a Fanuc 30i it can be programmed using G41.2 (G42.2) or G41.6 (G42.6)

It is a dynamic offset.

"Of or relating to objects in motion"

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PostPosted: Tue Nov 08, 2005 9:35 pm 
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Heidenhain controllers can do this as well. Never tried it myself, but I know that they can do it.

Alternatively, I think all the tooling companies, certainly Japanese ones, make a range of tools that are made to tighter tolerances than normal, +/- 0.005mm on ball nose.

Ah, OSG do an "Exocarb" ball nose which is claimed to be held to +/- 0.003mm (+/- 0.00011")

I don't know what they cost, but if you are trying to achieve high precision and finishes then it sounds like you have to have them.

Why can't you measure the tools beforehand btw?

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PostPosted: Tue Nov 08, 2005 10:28 pm 
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You can buy a non contact probe "Renishaw NC3" and measure the profile of the cutter and have it adjust your cutter compensation automatically :wink:

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PostPosted: Tue Nov 08, 2005 10:45 pm 
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MMT-USA wrote:
You can buy a non contact probe "Renishaw NC3" and measure the profile of the cutter and have it adjust your cutter compensation automatically :wink:


OOOO!
Sounds like loads of

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PostPosted: Wed Nov 09, 2005 3:36 pm 
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I machine everything at 1/2 the tolerance on the print, so that is .0002 in most cases, we are a tight toleranced mold shop. I geuss I need to contact someone about my MAKINO SNC 64 to see if I can use 3d cutter comp, also the Post will have to be changed also..


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PostPosted: Wed Nov 09, 2005 8:09 pm 
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Does anybody here use 3D CUTTER COMP???


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PostPosted: Wed Nov 09, 2005 8:44 pm 
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Nope, never tried it. In fact, we only recently have a machine that is capable of using it, a Heidenhain TNC 530.

Personally I would go with the super accurate tools and no 3D compensation first of all, as they are guarenteed to be within those limits with no extra effort on your part. If you are trying to work within +/- 0.0002" then you need some means of measuring the tools you have to a tighter tolerance than that.

Also, unless your shop is temp controlled, and the machine has thermal compensation/cooling etc, you will have a hard time staying within that. We have run Hurcos for a while now and they are awful for drift with temperature change, can be as much as 0.05mm in Y or Z or both as the machine and shop warm up/cool down.

Last, but not least, is your machine 5 axis? and have you got the multax option in powermill. If not, forget using 3D cutter comp because it only works with multax toolpaths. (I think)

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PostPosted: Thu Nov 10, 2005 1:20 pm 
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I will go with the more expensive tooling :lol:


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PostPosted: Thu Nov 10, 2005 1:49 pm 
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MAKINOMAN wrote:
I will go with the more expensive tooling :lol:


If you want quality and an accurate grind "Kobelco" is the only way. You get what you pay for.

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PostPosted: Thu Nov 10, 2005 1:55 pm 
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MMT-USA wrote:
If you want quality and an accurate grind "Kobelco" is the only way. You get what you pay for.


I like a good accurate grind...... :shock: :D :lol: 8)

We use Mitsubishi (Kobelco) for all of our accurate work, although any of the major japanese tooling manufacturers make some damn good stuff.

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 Post subject:
PostPosted: Thu Nov 10, 2005 4:18 pm 
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Has anyone used Fraisa endmills for Aluminum?

We use them and I question their ability to cut properly.

Thanks for any info you can provide.

Kirk


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 Post subject:
PostPosted: Thu Nov 10, 2005 4:18 pm 
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Makinoman was your initial request simply to understand what 3D compensation is about in Powermill? If so the answer is that most machines require the IJK vector of the surface normal to be written on each line of the NC program file in order to do 3D compensation.
In order to do this you need to calculate the toolpath with the contact normal in the first place, which you do by ticking the "Contact Normal" box on the Tools->Options form (toolpath tab). We don't do this by default because it uses extra memory.
You also need to select the "Cutter Radius Compensation" to "3D" - this will mean that the vectors are written in the cutfile.
Lastly you need to make sure your option file is set up for 3D compensation.
Having said all this we provide this because some customers have asked to use 3D compensation, we do not have enough evidence to know how well it works.


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 Post subject:
PostPosted: Thu Nov 10, 2005 4:33 pm 
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3D cutter comp is a payable option from Makino, which I do not have, I want to investigate this option so I can see if it could apply to my applications, the total cost is over $6000.


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 Post subject:
PostPosted: Mon Nov 21, 2005 4:24 pm 
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Hi Makinoman

I've used 3D cutter compensation on a Matsuura with a Fanuc 15M controller. We used it mainly for machining EDM electrodes with different gaps. G1 moves with X,Y,Z,I,J,K and it worked perfect. Only one important issue. It only works with ballnose cutter's programmed to center and not tip. This you can change then posting the program.


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