Tool Comp

[MetalMarvels]

This one has had me pulling hair for several hours. I suspect that the answer has been staring me in the face, but I just can't see it.

 

I am pre-drilling a 1/2-inch diameter hole 0.7-inches deep then using a 0.500 diameter M.A. Ford endmill to finish the inside diameter to 0.625 inches (using contour). I have a small lead-in, lead-out selected (about 0.05 inches)and wear comp selected for the tool. I get a G41 and the D* in the posted code for the endmill, but regardless of the amount of offset I put in the offset table for the tool in the machine - no changes in the cut diameter..... Using a Fadal 3016L. The tool comp seems to work just fine when I use it in other paths - but the lead-in, lead-out is larger.

 

Does this mean that my lead-in, lead-out is just too small??

[Trevor Bailey]

I don't think that is it. I have a 15XT and almost always bore my fixturing holes with end mills using as little as .002 for my lead in/out and radius. My machine works fine this way.

[McRae]

Post file to FTP site and we will have a quick look. Suspect that the leadin/out switch is not set correctly. Would also suggest to chain a point as the entry position and then to use leadin-out from here.

[Keith Graydon]

I have found that any dummmy (lead-in)moves should be larger that the offset. This gives the tool, "somewhere to go". so to speak.

 

How much offset did you plan to use? and are you climb cutting the bore?

 

In the Fadal's that i use i do this for lead-in.

 

180 degree arc in and out.

the lead-in radius is 1/4 the difference between the actual cutter diameter and the finish hole size.

 

(.625-.5)/4 = .0315 (lead-in radius)

 

This technique lets the tool enter the bore on the virtual center.

 

Oh, and BTW what version MC are u using?

 

-Keith

 

[ 01-06-2003, 03:46 PM: Message edited by: Keith L. Graydon ]

[Roger Peterson]

Are you leading in with a radius only? Can you turn cutter comp on on an arc move in a fadal? Are you putting in a posative or a negative value in the radius register, if it is a negative value is that a valid value in a fadal? If it is negative try changing it to a posative value and picking reverse wear for your compensation.

 

Other than that I don't know.

[McRae]

Check out the FTP under the MC9 directory and look at the file Contour_WearComp.zip

 

Posting using MPMASTER gives result zipped inside. Set the compensation to Wear.

[MetalMarvels]

Keith,

It just slapped me in the face!!!!! I was using a 0.0498 (10%) lead-in line and arc. TOOOO BIGG for a 0.650 hole with a 0.500 cutter. The lead-in, lead-out was too big and it didn't actually USE the lead-in, lead-out - it was plunging. Therefore NO compensation.

 

Duh.....

 

Changing the lead-in, lead-out as you suggested did the trick. The really sad part is that I KNOW this...... Must have had a senior moment.

 

Thanks all.

[MetalMarvels]

BTW I am using MC 9.0SP1, a modified MPFADAL post, and a Fadal 3016L.

 

Thanks again. I just KNEW that the blasted answer was staring me in the face - I just could not see it!

 

[McRae]

You still have ten minutes to cut the part before you go home for the night, good work!

[Keith Graydon]

Gary,

glad to help. sorry to hear about the "senior moment".

 

now, what was the question?

 

LOL

-KLG