Cnc Threading Machine

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CNC software includes 'canned cycles', that is, preprogrammed subroutines, that obviate the manual programming of a single-point threading cycle. Parameters are entered (e.g., thread size, tool offset, length of thread), and the machine does the rest. G76 Threading Cycle for CNC Lathes (Fanuc, Haas, Mach3, and LinuxCNC) CNCCookbook’s G-Code Tutorial G76 Threading Cycle G-Code Basics. In this section, we walk through the different parameters that will be specified to tell the G76 threading cycle how to cut the specific thread you want. QK1319 CNC Heavy Duty Oil Pipe threading lathe machine is mainly designed to process all kinds of internal and external pipe threads including metric,inch,module,DP and taper threads,as well as having all the common functions of normal CNC lathe such as processing the inner bore and end face of shafts and disks.This series lathe machine is. Buy with confidence - Smithy Tooling is quality-built to match the needs of small shop machinists. May 17, 2015 This quick tutorial walks through creating a Form Tool Thread Mill in SolidWorks then using that tool in HSMWorks (Or HSMxpress or Fusion360!) to create a thread.

Cnc Machine Threading Calculation
Cnc Lathe Machine Threading

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Plastic
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CNC lathe threading problem
Hello Everyone,
I am new to the group and this is my first posting. Here's my problem. I am trying to single point a M30 x 3.5 thread and the thread is not coming out right. I've tried running the thread on 2 different cnc lathes (Ameri-Seiki TC-5XL with a Fanuc OTC control and a Mori-Seiki SL-6 with a 6T control). I've tried using a G76 threading cycle and a G92 threading cycle and the pitch of the thread seems to be off. I'm running at 400 RPM and a thread lead of .13779. The insert is rated for a 3.5 thread pitch, so I am at a loss as to why the thread is not coming out right. I've run hundreds of threads before on both machines with no major problems, although this is the coarsest thread I've ever run.
Any suggestions?
Titanium
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Post your code, it will tell us much more.
.13779 is rounded down, but it'd have to be a seriously long thread to cause any measurable error. How are you measuring the pitch? Have you tried running it in metric?
Plastic
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G0X.963Z.5
G76P020060Q0020
G76X1.2025Z-2.25P0702Q0080F.13779
Also,
G0X.963Z.5
G92X1.2025Z-2.25F.13779, the adding each X pass up to 1.2025 with a couple of spring passes.
Titanium
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Nothing wrong with that, at least that would affect pitch. You are missing the R on the first G76 line (finish pass DOC), and .1378 is nearer to 3.5mm than .13779, but like I said it would be unmeasurable.
You didn't answer my other questions, but since you are getting the same result with ok code on two different machines that otherwise work fine for you, I would tend to assume that you have some kind of measurement issue.
So, how are you checking the pitch, and what is leading you to believe that it's wrong?
Aluminum
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check relief angle on thread tool to make sure it has enuf
Ox
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Well, with a Z start point of .5 I would like to think that any 'ramp' is done by then, but I am wondering if by chance you are out of reliable feedrate?
400 x .140 isn't much, but on a '6' or '0' I don't know.. ???
Did you try 250 RPM just for grins?
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Think Snow Eh!
Ox
Titanium
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Originally Posted by Ox
Well, with a Z start point of .5 I would like to think that any 'ramp' is done by then, but I am wondering if by chance you are out of reliable feedrate?
400 x .140 isn't much, but on a '6' or '0' I don't know.. ???
Did you try 250 RPM just for grins?
--------------------
Think Snow Eh!
Ox
400rpm x 3.5mm/r is only 1400mm/m. The oldest, slowest lathe I ever used (Harrison M400, Anilam Crusader 2, early '80's) was quite happy threading at 2500mm/m.
Hot Rolled
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I would try a top notch small bar. Make sure the centre height is good. The top notch has a 5 degree relief on it so and problems with relief, changing shims and tool damage would be taken away. The next think I would check would be to check the gauge. Maybe it is off.
If the parts are good with the top notch then there is a tooling issue. I usually resort to this when I am trouble shooting some threading issue. If it is bad with top notch then I would say it is the measuring gauge.
Titanium
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Cut a part in half lengthwise on a bandsaw. Is the thread shiny on both sides? Insert clearence problem. Is there a step on the face of the thread?Part may be moving in the chuck.
i_r_
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Originally Posted by i_r_machinist
Cut a part in half lengthwise on a bandsaw. Is the thread shiny on both sides? Insert clearence problem. Is there a step on the face of the thread?Part may be moving in the chuck.
i_r_
Sorry for not getting back sooner. Mori-Seiki says you can stay in English mode up to a certain point when metric threading, but a very course thread like an M30 x 3.5 requires the program and control to be in metric. I tried it and it worked. Here's the code I used:
G76P020060Q0100
G76X30.5435Z-57.15P1783Q0225F3.5
gregormarwik - The only 'r' for this control (according to the book) is for a tapered thread (straight thread- no R needed). The 'Q' in the first line is the minimum depth of cut.
Thank you all for your input and suggestions.
Diamond
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Well, I would like to say I learned something on this thread, and I did, but it raises a question also. I don't see what the difference is what you program with (metric or english) as long as your feed it correct for the pitch.
Plastic
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metric or english ????? WTF . metric or imperial or do you lot on other side of world have another system
Diamond
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Originally Posted by jdaisy
metric or english ????? WTF . metric or imperial or do you lot on other side of world have another system
Ok, I thought it was called English. Imperial it is.
Ox
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Diamond
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Originally Posted by turnman
Sorry for not getting back sooner. Mori-Seiki says you can stay in English mode up to a certain point when metric threading, but a very course thread like an M30 x 3.5 requires the program and control to be in metric.
Ok, so now I have a question.
Do we - the Imperialistic pigs that we are - have to go pound sand if we ever need a 7 or under size pitch thread made on Mori lathes?
BTW, I may be out of place here, but for some reason I remember reading something about 5 decimal digit feedrates needing to be programmed using E instead of F.
That is to say:
G76 P020060 Q0020 R5
G76 X1.2025 Z-2.25 P0702 Q0080 E.13779
OX
LOL!!!
Titanium
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Originally Posted by turnman
Sorry for not getting back sooner. Mori-Seiki says you can stay in English mode up to a certain point when metric threading, but a very course thread like an M30 x 3.5 requires the program and control to be in metric. I tried it and it worked. Here's the code I used:
G76P020060Q0100
G76X30.5435Z-57.15P1783Q0225F3.5
gregormarwik - The only 'r' for this control (according to the book) is for a tapered thread (straight thread- no R needed). The 'Q' in the first line is the minimum depth of cut.
Thank you all for your input and suggestions.
Hi turnman,
Notwithstanding that your book (assuming it to be the TC-5XL book) may not mention an 'R' address for the first G76 block, the OTC control does have an 'R' address included in the first G76 block of the two block G76 format. It's presence or not, is not machine make dependent, but a function of the Fanuc control; it specifies a finishing allowance, and you will find reference to it in the Fanuc manual. If the address is omitted, the value specified in the previous G76 cycle that used this address will apply. However, if the above code is being used with the Mori, and the Mori has the 6T control referred to in your first Post, I can't see that working at all; the 6T control never used the two block G76 format.
Not that it makes any difference to the problem you've been experiencing, but to specify X30.5435 as the Major Diameter for an M30 thread is poor programming form. Its tantamount to writing X40.500 in a turning operation where the diameter required is 40.00mm; it just doesn't make sense when reading the program. Programs should be created using logically correct coordinates and the size adjusted via tool offsets.
Regards,
Bill
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One thing I tell my students when it comes to G76/G92 thread cycles is make sure you start with plenty of room!
So I like to have a minimum of around .2' clearance in 'Z' and about .5' in 'X' - this way the machine can calculate its lead correctly.
Also, make sure the lathe is in G97 Straight RPM mode and G99 I.P.R. mode with cutter comp canceled.
Titanium
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Originally Posted by DouglasJRizzo
One thing I tell my students when it comes to G76/G92 thread cycles is make sure you start with plenty of room!
So I like to have a minimum of around .2' clearance in 'Z' and about .5' in 'X' - this way the machine can calculate its lead correctly.
Also, make sure the lathe is in G97 Straight RPM mode and G99 I.P.R. mode with cutter comp canceled.
Hi Douglas,
When cutting a thread long the Z axis, the amount of clearance in X is irrelevant with regards to the Lead inaccuracy that may occur at the start and end of the thread due to acceleration/deceleration respectively. A clearance of 0.5 in X, even if you mean 0.5 as a diameter value, will result is a fairly small diameter threading bar being required for an M30 internal thread. With a G76 cycle used with an internal thread, as long as the threading tool has some clearance on the minor diameter bore, that will work. The clearance of the tool in Z at the start, and the inaccuracy in the thread lead at the end of the thread if not finishing in a groove of appropriate width, is a a function of the Thread Lead and the the Spindle Speed being used. Accordingly, 0.2' may not be enough as a minimum clearance for a 3.5mm lead thread, even with the conservative 400 RPM being used by the OP.
Regards,
Bill
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Bill
These were generalized rules of thumb. If you short change the machine on 'Z' it will not have the ability to accelerate the servo drives and properly synch with the spindle. Crossed threads, broken inserts and lousy parts result. Obviously, one would have to use judgement when it comes to clearances.
I've seen people start a G76 thread cycle with the tool right on top of the part and wonder why it looks like it was hewn out with a dull file.
Ox
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Originally Posted by Dave K
Well, I would like to say I learned something on this thread, and I did, but it raises a question also. I don't see what the difference is what you program with (metric or english) as long as your feed it correct for the pitch.

Since no-one else has touched that - I will say that this is not the first time I have heard of this.
Apparently for some reason the Fanuc can crunch numbers in metric faster. Possibly if the thing always thinks in metric - then it hasta convert everything from inch to metric first?
I think that most folks on this site understand the dwell involved with this first hand.
I don't know if that is the case for sure, but like I said - I have heard of this before.
(A long time ago, far far away..)
---------------
Think Snow Eh!
Ox

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