5 Axis Positional Code questions. Have pictures and MCX file Inside.

I had made a post last week, that sorta got confusing. So I decided to take another simular part and try it again. I drew up in SW the exact orientation of the machine so there is no confusion there. As you can see The machine is a tilting rotary table style of 5th. It is a B and C, with the B being the tilt, and the C being the rotary.


http://i.imgur.com/OPvyR97.png

http://i.imgur.com/2yHeiuV.png

http://i.imgur.com/fmcG071.png



You can see the Positive movment for each axis.

Now lets look at the mcx problem.


http://i.imgur.com/BBGor5f.png

http://i.imgur.com/4uVkwvX.png

http://i.imgur.com/PxMVeOL.png


It is the RED face that I am starting with.

Here is the begining part of the code it outputs:

N102 G20
N104 G0 G17 G40 G80 G90 G94 G98
N106 G0 G28 G91 Z0.
N108 G0 G28 X0. Y0.
N110 ( 1/2 FLAT ENDMILL TOOL - 1 DIA. OFF. - 239 LEN. - 1 DIA. - .5 )
N112 T1 M6
N114 G0 G54 G90 X-5.2979 Y3.3719 C-81.765 B47.494 S3000 M3
N116 G43 H1 Z7.1048
N118 M8
N120 Z6.9548
N122 G1 Z6.2936 F5.
N124 X-4.992 Y3.1204 F20.
N126 X-2.0155 Y3.4114


As you can see it is wanting to do a C-81.765. When I think it should be doing a Neg 8.235 Deg. And it is outputing a B 47.494 when It measures to be needing a B 47.2?

I think I have something wrong in my MISC VALUES section of the Parameters of my toolpath. Can someone look to see what I am doing wrong?

hello ,problem is in your plane are made wrong,check this file .

It looks like you created a surface and then did a surface pocket. The problem is the surface is not parallel to the surface I am trying to cut if you look perpendicular on the view you created?.

What post are you using?

MILL 5 - AXIS TABLE - HEAD VERTICAL

Quote:

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Originally Posted by blakemachine

MILL 5 - AXIS TABLE - HEAD VERTICAL

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My understanding for this description is :-

a "MILL 5 AXIS" post, 4th axis is "TABLE" moving, 5th axis is "HEAD" tilting, Spindle normally "VERTICAL"
your picture is for a "TABLE-TABLE"

the concept of the X & Y positive table movement is OK for 2D work,.... but lose that thought when stepping up into 3D spacial machining....it's the tool that does all the moving & rotating around a fixed part. ( I hate it when manuals show Z+ to move the tool, & the other X/Y buttons to move the table )

Your angles may not be correct as they are taken from intersecting face edges, the only true item to measure from is the hole axis line

Try re-creating your planes by selecting the hole circle wireframe ( it cannot be a spline ), this should give you a couple of variants of Z axis direction/orientation ( select the one coming away from your red face ). This would place your red face perpendicular to the Z axis. It would be simple to then to rotate that new view around Z to get your best C/T plane, re-pick the origin to your tooling ball.

Yea, thats what it is, is that to get the correct compound angle, you cant just move to the angles that are on the part, as the 5th table cant move in those axis, so it becomes a trig function. Turns out is that the code is somewhat output correct. The problem is that it is giving a C of -81.765 when it should be 90.0-81.765= 8.235. But the correct is -8.235 degrees. I dont know why its outputing the -81.765 and not the -8.235. What would be the correct post that I should be using?

MILL 5 - AXIS TABLE - TABLE HORIZONTAL it still wants to spin C axis -81.765 instead of -8.235. I dont get why its referencing from 90 deg with the part orientated the way it is.

Quote:

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Originally Posted by blakemachine

MILL 5 - AXIS TABLE - TABLE HORIZONTAL it still wants to spin C axis -81.765 instead of -8.235. I dont get why its referencing from 90 deg with the part orientated the way it is.

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You would need a TABLE-TABLE VERTICAL
- with a CNC machine build having the C-axis on top of the B-axis. So that B-axis would tip 47.2°, & the C-axis would go to +8.2°

The NC output would seem to be OK.... if a B-axis is on top of the C-axis ( C-axis rotates 81° CW, B-axis tips 47° CCW )

Put up a pic of the TOP view of the red face, so I can see how it is seen by the tool.

You'll also find that the angle ( the items you dimension the angles on ) are not 90° to each other.

- create a line thru the bore, and angle dimension it in TOP & FRONT views to get the proper angles to have the red face flat for machining

Hi Sir,
The Mastercam post proceesor for 5 axis post C value not correct and B value correct
but the sign miss up with + and -. The only way I do is to edit the post by calculate again the C and
keep B always - and add under the G54 line (red line). The B-47.947 is correct( 90- 42.5056 = 47.494)
because the part rotate C171.765 to another side.

T1 M6
G0 G54 G90 X-5.2979 Y3.3719 C-81.765 B47.494 S3000 M3
C171.765 B-47.494
G43 H1 Z7.1048
M8
Z6.9548
G1 Z6.2936 F5.
X-4.992 Y3.1204 F20.
X-2.0155 Y3.4114

Good luck.
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