need basics on z when in a g02 or g03 command

[bradyfb]

I dont know how to say this so you will understand what im doing. So here it goes; I figured out that i can rout a line from 0 go 24" and start at the top of the wood 0 and go 24" and be at a 1/4" deep and this make a nice even and gradule Vee grove. Now at the end of this vee grove I want an arc with the center of the arc being at the end of the vee grove, But I want to bring the vee grove out on the arc and the z to go from 1/4" to 0 at the end of the arc and then go back to the long vee grove and do the same thing on the bottom of this arc. I can not get the z to come out at a sweep like the long vee grove. Any help? Thanks Bradythe little drawing isnt comeing out right the astrix should be at the other end above and below the (ctr of arc)
0"deep
*
0" *
0"deep 1/4"deep 24"*
******************************************ctr of arc
*
*
*
0"deep

[joe vidauri]

i think you will need to use G17,G18 or G19 you will need to get a g code list to figure out which one it is.

[bradyfb]

Are you saying to use the G17,18,19 in place of the G02,3

[ger21]

Your control might not allow helical movement with G2/G3. You should just have to do

G2 Xxx Yxx Z0 Ixx Jxx

If the tool is already at -.25, it should ramp up to Z=0 along the arc. But some controls won't let you do this.

[Kiwi]

Can you cut a Helix with your controller? that should do what you want.

[bradyfb]

Never tried a helix, I do not have g-code to try. I'm still lost!!! Since my machine will make a linear move and ramp the Z axis. This ramping function I trying to do may not be able to be done useing a G02,3 command since this is an arc/circle command. I have tried what ger21 suggested but the Z axis does not ramp. The helix suggested above if you have g-code with g02 or g03 in it could I barrow it I have a 3 axis machine. I'll try to get a hold of the guys at deckcnc. Thanks Brady

[Kiwi]

If your controller doesn't Z when arcing with G02/3 you may need to move in small increments using G01.
What are your specs for the arc you wish to cut. eg.
XY centre: Start XYZ: End XYZ and I can generate some gcode.

[bradyfb]

Kiwi, I really appreaciate the offer. But I really haven't got what I'm doing figured out yet. And deskcnc just got back with me and the 2nd generation controller i have is not capable of a g02,3 helix move. So now I'm going to think about another design. And Thanks to all for the help. I learn something new every day.

There is one more question; If you were to buy a program that had solids, which if I'm reading this right is the better way to draw, instead of trianglization which produce alot of code. I dont have a program with solid works so I really dont know that much about it only what im trying to grasp as i read other forums. Anyhow Thanks to all, Brady

[wganders]

If your control supports it, you would need to use G19 for Y/Z circular interpolation, or G18 for X/Z circular interpolation. This would be used in conjunction with the G02/03.

If your control doesn't support helical interpolation, you will need to linearize the arc move.

[dertsap]

something like that would be as Ger said with a g17 , g18 and 19 are a whole other ball game

[bradyfb]

My control dont support helix; ican use g02,3 and i can use g17,19. And now I'm confused. How do I linearize the arc move? That is what g02,3 are for to eliminate excessive amounts of code? RIGHT? Could you show me what the g-code would be for an arc, Perferably an arc that starts at X5.0 Y1.5 Z-.25 and the other end of arc go to X5.5 Y2.0 Z0.0 Thanks Brady

[Kiwi]

Here is code using G01 straight movements of approx 1in.
The centre of this arc is X0 Y0
Is this what you require?
G01 X5 Y1.5 Z-0.25
X5.2064 Y0.5794 Z-0.2427
X5.2441 Y-0.3666 Z-0.2355
X5.1107 Y-1.3073 Z-0.2282
X4.8093 Y-2.2118 Z-0.221
X4.3487 Y-3.0503 Z-0.2137
X3.7429 Y-3.795 Z-0.2065
X3.0106 Y-4.4208 Z-0.1992
X2.1748 Y-4.9065 Z-0.192
X1.2623 Y-5.2352 Z-0.1847
X0.3023 Y-5.3951 Z-0.1775
X-0.6741 Y-5.3799 Z-0.1702
X-1.6351 Y-5.1887 Z-0.163
X-2.5492 Y-4.8268 Z-0.1557
X-3.3862 Y-4.3047 Z-0.1485
X-4.1182 Y-3.6385 Z-0.1412
X-4.7205 Y-2.8489 Z-0.134
X-5.1727 Y-1.9611 Z-0.1267
X-5.4589 Y-1.0032 Z-0.1194
X-5.5686 Y-0.0062 Z-0.1122
X-5.4972 Y0.9975 Z-0.1049
X-5.2457 Y1.9753 Z-0.0977
X-4.8212 Y2.895 Z-0.0904
X-4.2365 Y3.7261 Z-0.0832
X-3.5096 Y4.441 Z-0.0759
X-2.6633 Y5.0154 Z-0.0687
X-1.7245 Y5.4297 Z-0.0614
X-0.7233 Y5.6694 Z-0.0542
X0.3079 Y5.7254 Z-0.0469
X1.3357 Y5.5948 Z-0.0397
X2.3265 Y5.2806 Z-0.0324
X3.2476 Y4.7919 Z-0.0252
X4.0684 Y4.1436 Z-0.0179
X4.7616 Y3.3559 Z-0.0106
X5.3037 Y2.4536 Z-0.0034
X5.5 Y2 Z0