Need Help!- Helical cutting

[Maxz]

I would like to make a hole 100 mm with 250 mm depth on 18M control. It is possible to do that by using helical method? (tool dia 60 mm)
I tried..
N001 G1 Z0 X20. Y0 F600
N002 G3 G17 X20. Y0 Z-250. K1.25 I0 J0 F200
N003 G1 X0 Y0
N004 G0 Z50.

It shown alarm ILLEGAL PLANT AXIS COMMAND

Please suggest what I did wrong. I already change parameter #9930 as 1100111
Thanks in advance
Maxz

[Maxz]

Additional information,
I tried below with A2100 (Cincinnati) it can work smoothly

N001 G1 Z0 X20. Y0 F600
N002 G3 G17 X20. Y0 Z-250. F200 K1.25 I0 J0
N003 G1 X0 Y0
N004 G0 Z50.

[HuFlungDung]

I would question the arc center coordinates. If the arc centers are incremental, then I0J0 could not be correct for a 50mm radius.

If the arc centers are in absolute coordinates (on the Cinci) and the hole is centered on X0Y0, it could work.

[dcoupar]

Try this:

N001 G1 Z0 X20. Y0 F600
N002 M98 P2001001(CALL SUB 200 TIMES)
N003 G1 G90 X0 Y0
N004 G0 Z50.
...
...
M30

O1001(SUB)
G3 G17 G91 Z-1.25 I-20. J0 F200
M99

[Maxz]

Hi Dcoupar,

thank you for your advice. I will let you know the result after I try.

Maxz

[Maxz]

Hi Dcoupar,

I have tried the suggestion. It worked so good. Thank you so much.

Maxz

[davereagan]

Did you do this from the solid? What style of facemill? 50 taper spindle? (That's a long hangout for a 40 taper)

[Maxz]

I used 66 mm diameter with round insert. I have drill dia 40 mm at the center before helical cutting. I extend the holder with 60 mm capto (total length 290 mm)
My OKK machine is BT50 taper. I changed the depth (from 1.25) to 0.7 mm only. Spindle 1200 rpm with 800 table feed. Workpiece is S45C material.

[davereagan]

That sounds like quite a rigid machine. So you are running 357 laps with .7mm lead? Is it just too loud/harsh sounding with 1.25mm lead? With 66mm cutter, your cutting path radius is 17mm, right? I calculate 106.76mm per revolution, so you would be running 7.5 laps per minute and 357 laps would take 48 minutes. Long time, but to have a 100mm hole 250mm long in medium carbon steel 48 minutes later would be nice.