The question of proper threading
07 Jul 2020 13:49 #173836
by pkasy
The question of proper threading was created by pkasy
Hello.
I have been using the system not so long ago, maybe since 2014, and I cut a lot of threads. And I was always wondering why they do not always turn out smooth? What settings should be on the lathe, which encoder, what rotation speed?
I tried to increase the distance in front of the thread to stabilize the speed. I tried to exit the thread a multiple of the thread pitch and the length of the thread a multiple of the thread pitch.
it still turns out very badly.
Please teach me how to cut the thread correctly.
I have been using the system not so long ago, maybe since 2014, and I cut a lot of threads. And I was always wondering why they do not always turn out smooth? What settings should be on the lathe, which encoder, what rotation speed?
I tried to increase the distance in front of the thread to stabilize the speed. I tried to exit the thread a multiple of the thread pitch and the length of the thread a multiple of the thread pitch.
it still turns out very badly.
Please teach me how to cut the thread correctly.
Please Log in or Create an account to join the conversation.
09 Jul 2020 06:43 #174059
by pkasy
Replied by pkasy on topic The question of proper threading
the simple question, why does the tool pause before the exit taper?
Please Log in or Create an account to join the conversation.
09 Jul 2020 07:46 #174062
by Clive S
I think it might help if you gave more info ie. Do you have an encoder onthe spindle for A+Z and post your ini and hal files with the Gcode you are using to thread with.
Replied by Clive S on topic The question of proper threading
the simple question, why does the tool pause before the exit taper?
I think it might help if you gave more info ie. Do you have an encoder onthe spindle for A+Z and post your ini and hal files with the Gcode you are using to thread with.
Please Log in or Create an account to join the conversation.
09 Jul 2020 08:23 #174073
by pkasy
Replied by pkasy on topic The question of proper threading
ok.
I have same problem at all my different cnc lathes.
It does not depends on one exacly machine.
Spindle has encode ABZ 2500 ppr.
GCODE:Hal:
It looks to me as working with G61 - tool stopped before exit taper.
If I put G64 P0.25 - it moves much better.
But who cut threads with G64?
I have same problem at all my different cnc lathes.
It does not depends on one exacly machine.
Spindle has encode ABZ 2500 ppr.
GCODE:
G76 Z[-#<Len>+#<startZ>] P[#<P>] I[-#<I>] J[#<FC>] K[#7*2] H2 L[#<Taper>] E[#<TaperL>] R1.5 Q29.5It looks to me as working with G61 - tool stopped before exit taper.
If I put G64 P0.25 - it moves much better.
But who cut threads with G64?
Please Log in or Create an account to join the conversation.
10 Jul 2020 02:53 - 10 Jul 2020 06:19 #174178
by pkasy
Replied by pkasy on topic The question of proper threading
here is a EMC code:
so in my case taper_pitch < pitch, why?
cutting feed is 600 mm/m as I see at Axis, but at tapper feed is 300 mm/m (about).
but they must be same, right?
START_SPEED_FEED_SYNCH(pitch, 0);
if(taper_dist && exit_taper)
START_SPEED_FEED_SYNCH(taper_pitch, 0);so in my case taper_pitch < pitch, why?
cutting feed is 600 mm/m as I see at Axis, but at tapper feed is 300 mm/m (about).
but they must be same, right?
Last edit: 10 Jul 2020 06:19 by pkasy.
Please Log in or Create an account to join the conversation.
14 Jul 2020 23:33 #174670
by pkasy
Replied by pkasy on topic The question of proper threading
G76 doesn't seem to use an encoder to move. I tried to rotate the spindle with my hands on the engine turned off. The EMC waits for a full turn and jumps. and not always.
Please Log in or Create an account to join the conversation.
- tommylight
-
- Away
- Moderator
-
Less
More
- Posts: 17795
- Thank you received: 5915
15 Jul 2020 08:16 #174695
by tommylight
Replied by tommylight on topic The question of proper threading
That does not seem right.
Can you do a video of that while monitoring with halshow encoder inputs ?
Can you do a video of that while monitoring with halshow encoder inputs ?
Please Log in or Create an account to join the conversation.
15 Jul 2020 23:34 #174780
by pkasy
Replied by pkasy on topic The question of proper threading
the video turned out to be of poor quality, since there is no tripod for the phone.
but here is a screenshot of the signals from the encoder when I rotated the spindle by hand. as you see, everything works.
but the cutter stands still and waits for something. sometimes jumping, sometimes follows.
but here is a screenshot of the signals from the encoder when I rotated the spindle by hand. as you see, everything works.
but the cutter stands still and waits for something. sometimes jumping, sometimes follows.
Please Log in or Create an account to join the conversation.
16 Jul 2020 06:35 #174806
by Clive S
Is the encoder counting the correct way ie is it increasing +ve when turning the spindle
Replied by Clive S on topic The question of proper threading
the video turned out to be of poor quality, since there is no tripod for the phone.
but here is a screenshot of the signals from the encoder when I rotated the spindle by hand. as you see, everything works.
but the cutter stands still and waits for something. sometimes jumping, sometimes follows.
Is the encoder counting the correct way ie is it increasing +ve when turning the spindle
The following user(s) said Thank You: pkasy
Please Log in or Create an account to join the conversation.
16 Jul 2020 08:10 #174812
by pkasy
Replied by pkasy on topic The question of proper threading
that's a very good question, thanks.
Please Log in or Create an account to join the conversation.
Time to create page: 0.121 seconds