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Problem with Thread deburring

 
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franke
Master Poster


Joined: 26 Jun 2004
Posts: 161
Location: Indiana, USA

PostPosted: Wed Jul 14, 2004 12:40 pm    Post subject: Problem with Thread deburring Reply with quote

I have a lot of trouble deburring (blunting) threads at the beginning and at the end of them. The G-codes that I do are generally for 1/6" pitch rounded threads on a HAAS SL-30 lathe (supposed to have Fanuc6T controller or similar).

Any ideas about how to make a G-code for "cleaning" the start and finish portion of the thread Question

I'm working on SL-30 Big Bore......it's not mine, though...

The beginning of a thread is "sharp" and needs to be "flattened", so it would look better and nobody could cut himself while twisting it in his hands...here's a sample of a sequence I use for making an OD thread:

G99 M24
X72.2 Z0
M19 P180
G97 S400 M03
G76 D0.8 X65. Z-19. K2.5 F4.23

This cycle is making an almost perfect 70mm thread with 4.23 pitch (1/6"). I do the spring pass afterwards.

In this case I am using M24, but when I do IDs I use M23.

I have tried different "P" and "X" settings, but to no avail. Never thought about changing "Z", though......I wonder whether a grooving insert would follow the same thread lead if I change "Z".

I have tried to do the deburring operation in a tapered way (with an “I” command), but without any success.

If it would be not much trouble to you, please contact me on:
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CNCJimmy7
Frequent Poster


Joined: 05 Jul 2004
Posts: 91
Location: Minneapolis, MN

PostPosted: Wed Jul 14, 2004 12:43 pm    Post subject: Reply with quote

Here is a clipped 3 pitch acme male thread.



Code:

(3 PITCH ACME)
G54
G00 G53 X0 Z-14.
G50 S3000
M41
T303
G00 G97 S150 M03
X4.315 Z0.0889 M08     (start position of thread--in front of part)
M24
G76 X3.753 Z-1.75 (length of thread) K0.177 A14 D0.008 F0.3333
G00 X4.315 Z0.1605
M09
G00 G53 X0 Z-14.
M01
 
(THIS CYCLE WILL COMPLETELY REMOVE (FLATTEN)THE THE VERY START OF THE THREAD.  IF DONE LIKE THIS EXAMPLE, YOU SHOULD BE ABLE TO RUB A BABY'S REAR ON THE STARTING THREAD AND NOT CUT HIM)



(THREAD CLIP 3 PITCH ACME)
(.187 WIDE V84 GROOVING INSERT)
G54
G00 G53 X0 Z-14.
G50 S1500
M41
T213
G00 G97 S150 M03
X4.315 Z0.27 M08 (start position in front of part)
M24
G76 X3.761 Z-0.275 (length of 1st thread to clip)K0.177 D0.008 F0.3333
G00 X4.315 Z0.1605
M09
G00 G53 X0 Z-14.
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