Ramp Contour with Wear Comp

[Bill H]

I work with a lot of smaller equipment and really like the Ramp Contour for milling larger holes.  My problem is that MasterCam inserts the G41/G42 code on an arc move with this toolpath.  Since this is a Bozo no no for our Haas mills, we're not able to fine-tune the hole size at the control by entering a wear value.  Is there some way to get MC to put the G41/G42 code on the linear part of the lead-in move?  Thanks!

[Leon82]

You can set a perpendicular lead in with no arc. You can use .0005 as long as you're not planning on using any positive cutter comp

[AMCNitro]

You need to set a straight lead in THEN a radius lead in, the straight lead in can be very small too.  Had the same problem years ago and I accidentally found the solution.   I don't understand why Haas mills have this problem.

[Bill H]

Leon82 - Thanks!  That seems to work fine.

AMC Nitro - Thanks for the response, but I don't understand.  The first segment of the toolpath I was working with was a short straight segment and then there was an arc.  Is this something different than what you're suggesting?

[Leon82]

It could be leading off with the arc. If your ramp depth isn't divisible by your depth evenly it will exit in a different spot than it starts.

 

Sometimes gouge check will alter the lead in on you also

[zachlancy]

....
G00 G17 G90 G55 X.9308 Y.9104 S12000 M03
G43 H4 Z1.
Z.0138
G94 G01 Z-.0862 F25.
G41 D4 X.9401 F72.
X.9382 Y.9472 Z-.0867
X.9322 Y.9835 Z-.0871
X.9224 Y1.0189 Z-.0875
X.9087 Y1.0531 Z-.0879
....

This is how I set up my ramps with comp

[[email protected]]

Haas Machines won't turn comp on or off on Arcs( G02 or G03 ). Like said previously just use lead in lead out settings. But I am curious what machines accept comp on Arcs? Also on small interpolations where your lead in/outs become very small like .005 for instance you can not exceed that value with your Wear value (D) or you will get an error as well.

[JParis]

Perpendicular entry and be done with it...at the bottom, if you're concerned about the retract...add a .005 to the ramp height on the out and it'll pick up as it pulls back

[deejflat]

On ‎10‎/‎30‎/‎2020 at 3:35 AM, zachlancy said:

....
G00 G17 G90 G55 X.9308 Y.9104 S12000 M03
G43 H4 Z1.
Z.0138
G94 G01 Z-.0862 F25.
G41 D4 X.9401 F72.
X.9382 Y.9472 Z-.0867
X.9322 Y.9835 Z-.0871
X.9224 Y1.0189 Z-.0875
X.9087 Y1.0531 Z-.0879
....

This is how I set up my ramps with comp

Very nice!  I will have to try this next time.  I typically don't try to finish to size with ramp, but I also really like using it. 

[crazy^millman]

2 hours ago, deejflat said:

Very nice!  I will have to try this next time.  I typically don't try to finish to size with ramp, but I also really like using it. 

I have finished bores with Helix and wear cutter comp for years.  

[Leon82]

3 hours ago, crazy^millman said:

I have finished bores with Helix and wear cutter comp for years.  

Yes, when they are really close I will under it the endmill and only use about .02 to.05 flute to make a straighter hole

[AMCNitro]

On 10/29/2020 at 5:46 PM, Bill H said:

Leon82 - Thanks!  That seems to work fine.

AMC Nitro - Thanks for the response, but I don't understand.  The first segment of the toolpath I was working with was a short straight segment and then there was an arc.  Is this something different than what you're suggesting?

Seems I misunderstood.  I thought you were having problems with Lead in?/Lead out.  

I don't understand the problem then, I finish 90 percent of my bores with Ramp Contour and never have problems.  When does it alarm out?  At lead in?  Perhaps the tool is too close to the size of the bore? 

Can  you send a file?