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Turning internal Rope thread
David here is the dimension of left hand rope thread R32.- Alex_cn
- Post #48
- Forum: CNC Machining
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Turning internal Rope thread
Hello David, It's is not really the case. based on your way of seeing it you would need an helix on with a radius of 1.6mm (thread depth) and with a pitch of 12.7mm. But and there is a big but the shape with the center originated from the helix isn't a circle due to profile of the thread.- Alex_cn
- Post #46
- Forum: CNC Machining
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Turning internal Rope thread
HI Marcus, I'm allready doing it in ID with the macro in my first post. I do OD on 6 meters bars with thread rolling mill (no cutting, it's deformed). And yes, what I'm trying to do is to make a cheap lathe without C but encoder doing something close to what okuma does.- Alex_cn
- Post #44
- Forum: CNC Machining
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Turning internal Rope thread
Hi Whirling is about OD threading. I actually produce anchor bar with OD thread by thread rolling process. For ID thread milling is a possibility. I'm actually thinking to had a live tool on the machine this would make thing easier and faster. I have to consider tool supply as that thread is...- Alex_cn
- Post #32
- Forum: CNC Machining
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Turning internal Rope thread
Hi Marcus, I did mean that the encoder isn't an absolute encoder. By that I don't know how many turn the spindle have done and I have to set the 0 position at every start of the machine by an M19 or M19S0 in order the the encoder find it's reference position. But it is 4096 pulse/ turn...- Alex_cn
- Post #27
- Forum: CNC Machining
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Turning internal Rope thread
Hi Marcus, The encoder send 4096 pulse per turn which lead to 0.087890625 degree. That should be far enough. X should be a function of the angle being read and Z given Z a fix feed rate. Not Z being a function of the angle which might lead to feed rate issue and as well and most importantly...- Alex_cn
- Post #25
- Forum: CNC Machining
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Turning internal Rope thread
Hi everyone, For those who are interested, I'm updating my progress. So I'm restarting from the basic, reading Fanuc manual. Step one to see, check systems parameter. Parameter 3117 #1 SPP set to 0 the data from the encoder doesn't show up in diagnosis 445 and 449. if set to 1 data from the...- Alex_cn
- Post #23
- Forum: CNC Machining
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Turning internal Rope thread
C axis machine have effectively 2 design. most of it have one normal motor acting as spindle and one servo motor for C axis. Some only have a servo motor capable of both. I just guess it came from two point, the torque and speed needed in normal turning compare to the positioning fonction of the...- Alex_cn
- Post #22
- Forum: CNC Machining
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Turning internal Rope thread
For the pause after looking again you are right it's not acceleration trouble. The macro... possible if to huge calculation. Sure some kind of plastic. With this depth of cut and this speed the insert won't last long in steel. for know I'll keep doing the standard threading way and look deeper...- Alex_cn
- Post #19
- Forum: CNC Machining
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Turning internal Rope thread
Hi wmpy, That is the a good eccentric turning with C and Y axis. It's quite relevant but I don't think it's the macro processing time which cause the slight stop on every turn. I would bet on acceleration and deceleration of the Y axis. Also the eccentricity in that part is quite big so it...- Alex_cn
- Post #17
- Forum: CNC Machining
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Turning internal Rope thread
Hi Implmex, Thanks again, You are right the point is to gain efficiency and quality. I didn't have a thought of a live tool which can easily be implemented on the machine. I'll have a deeper look a it and it sounds like a good compromise. the encoder is effectively a single count encoder...- Alex_cn
- Post #16
- Forum: CNC Machining
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Turning internal Rope thread
Hello Angelw. The execution speed of the customs macro might be an issue as well as the acceleration deceleration of the machine. The motion contrôle level might be a hint. If you have any rough lead which I can try out I’d appreciate. Once I tried by creating a dummy C axis. I explain my self...- Alex_cn
- Post #13
- Forum: CNC Machining
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Turning internal Rope thread
Thanks for the feedback. You got what I’m trying to do. Going to the okuma lathe isn’t a real economics option. For the price of one okuma in China, I’d get 5 machines as I already have and equipped with robots feeder and unloader. Sure the, SYMG aren’t as accurate and as durable as the okuma...- Alex_cn
- Post #12
- Forum: CNC Machining
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Turning internal Rope thread
That might be an interesting solution. I might consider it in the future. But still would like to try an hybrid eccentric turning threading. I go back to the question is there a way to read diagnosis 445 or 446 in fanuc macro to index X axis according to the angle. Thanks anyway.- Alex_cn
- Post #9
- Forum: CNC Machining
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Turning internal Rope thread
D Mandrel swaged would be really hard. I process the same material on bars with the exact same thread but external with a 3 dies thread rolling mill. It requires very high pressure and high torque. Also have some issues with this process, but I managed to produce qualified bars. Maybe I’ll...- Alex_cn
- Post #7
- Forum: CNC Machining
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Turning internal Rope thread
Thank you all for your reply. To answer few points rises up. @ Nmbmcer : it’s mass production. The lathe make those parts 23h/day 6 days/ week. Only this kind of part. The example I gave is one of the most difficult by the internal diameter and by the length. Bigger diameter one are easier to...- Alex_cn
- Post #6
- Forum: CNC Machining
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Turning internal Rope thread
Hello guys, First post on the Forum, so I'll introduce myself first. I'm a Frenchy leaving in China. I recently opened a workshop to produce anchor bars and coupling sleeve to connect the bars together. I produce the bar on a thread rolling mill and the coupling sleeve on a CNC Lathe SYMG...- Alex_cn
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- Replies: 48
- Forum: CNC Machining