contour ramp - cutter comp

[chall]

hey guys,

 

im having some problems, im finishing a slot .451 x .1930 with full rad's using a contour ramp with a 4mm Endmill (im using x5). im trying to finish it using cutter comp but when it cancels comp its going out side the slot boundary therefore milling into the part. is there any way to force it to apply and cancel comp inside the slots boundary?

[BenK]

Try adjusting your lead out until it looks correct. Most machines don't need a very long move to cancel your comp.

[Craig-B]

Try checking the box on your lead in/out to retract before last move, this should correct that.

[OC_THE MCX]

All good advise. I would like to add adjust lead arc sweep angle too (if using arcs)! and make sure "adjust start of contour" is not checked "extend"

[gcode]

an old trick for slots

 

set your lead in /lead out like this

 

tangent value = T

overlap = 2 x T

arc value = A

a = (slot width-tool dia) /4

arc radius = 180

check start at midpoint and start the chain on a straight wall

 

try it, you'll like it

[valus]

What kind of compensation do you use? Computer or control?

[chall]

thanks guys i will try all the advice and let you know how i get on.

i want comp in control.

[valus]

Maybe this is your problem. Retract perpendicular on contour and the value of retraction to be the size of your tool rad + a safe distance (usually the slot width minus tool diameter diveded by 2). If the retraction value is smaller than tool rad and you have compensation in control, when you cancel it, the tool will gauge into material. Be very carefully with compensation in control. Mastercam is not build to use this compensation by default.

[gcode]

i want comp in control.

 

disregard my suggestion ..control comp with those setting WILL scrap your part.

that suggestion works with computer and wear comp only

 

The control comp vrs wear comp debate is endless, but sooner or later you will give up control comp.

The only question is how many times control comp bites you

before you quit using it.

[MotorCityMinion]

Not sure about X5 but in previous versions:

 

Place a point where you want the cutter to exit and select that as the last entity when chaining your geometry. Turn on "use entry and exit point" then play with the lead out settings. This method works good in tight situations.

[Guest]

hey guys,

 

im having some problems, im finishing a slot .451 x .1930 with full rad's using a contour ramp with a 4mm Endmill (im using x5). im trying to finish it using cutter comp but when it cancels comp its going out side the slot boundary therefore milling into the part. is there any way to force it to apply and cancel comp inside the slots boundary?

 

 

i want comp in control.

 

I don't think you're going to get control comp to work in that slot.

 

If I read this correct, the slot is .193 wide and the tool is 4mm(.1574)Ø

 

Simply put to successfully turn comp on, you need to have a machine movement of .1574/2=.0787 as a minimum.

.193-.1574/2 means you only have .0178 on either side of the cutter if you are in the center.

 

Seems to me you're either going to use a smaller cuter, or wear compensation.

 

You could try turning comp on before the first Z move and after the last Z move on the lead in/lead out page but you may get a mark down the side of the slot

[chall]

this may sound daft but i have never used wear comp. always in control. what is wear comp? sorry for silly question.

[Guest]

sorry for silly question.

Not silly if you don't know

 

 

 

Wear comp works exactly like computer except the D# is output for adjustment, you value in the control is zero instead of the dia or half diameter depending on control.

 

Half the diameter of the tool is automatically built into the gcode program numbers

[gcode]

Wear means Mastercam outputs code comped to the centerline of the tool.

At the machine your D offset = zero and you adjust it up or down for waer as needed.

 

 

 

[chall]

So what are the ads of using wear over control? So if I'm right when using contol you set your tool rad in the tool table to the rad of the cutter like we do at the moment. With wear u will set the tool table rad as 0 and adjust it for the wear of the tool? s

[gcode]

yes.. you have it right..

the advantage is the comp on and comp off moves on the machine are much smaller and less likely to be incorrect or gouge the part.

With control comp, the comp on/off moves are 1/2 the tool diameter and Mastercam backplot may not show you what is really

going to happen on the machine.

With wear comp, the comp on/off moves are very small and much less likey to be something unexpected

[chall]

I know what you mean, I had that problem last week with comp in control and mastercam dint show it in back plot. I'll try using wear. Thanks for the help and advice!!

[Newbeeee™]

With wear comp, the comp on/off moves are very small and much less likey to be something unexpected

 

Sorry to gate crash...

With control, our lead ins/outs are set to 55% of tool dia as a default to always work.

With wear, can this run at say 10% as a std default (or even less)?

[Guest]

Sorry to gate crash...

With control, our lead ins/outs are set to 55% of tool dia as a default to always work.

With wear, can this run at say 10% as a std default (or even less)?

With wear, can this run at say 10% as a std default (or even less)?

 

Yes it can.

 

Since half the diameter of the tool is already built into the path, a very small move can be used.

[Newbeeee™]

Thanks JP