You only need run one pass like this. It may just scratch the first pass. Put your speed back up and you won’t see it. (It can be our secret)

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Don’t know what flank cutting is? Don’t worry it just means you are stupid. I won’t tell anyone, your secret is safe with me.

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At The Children's Hospital of Philadelphia, experienced otolaryngologists and plastic surgeons assess and treat infants, children and adolescents with a wide variety of ear deformities.

When using G76 you can’t use feedhold. On some controls the tool will retract but please check the small print first or try it in fresh air.

X         Core diameter of thread Z         Thread end point P         Depth of thread (as a radius no decimal point) Q        Depth of first cut no decimal point. F         Pitch of thread

In some children, an ear deformity is a symptom of a genetic disorder that can affect multiple body systems, such as Goldenhar syndrome and CHARGE syndrome. Ear deformities can be inherited or caused by genetic mutations.

For children with ear deformities that do not respond or are not candidates for nonsurgical correction, surgery may be needed. A team of expert plastic and reconstructive surgeons from CHOP’s Ear Deformities Program will work with you and your child to determine when surgical intervention, such as ear reconstruction, will benefit your child.

The ear is shaped like the letter C, formed by the helix and the earlobe. Inside the C is the letter Y, formed by the antihelix and the superior and inferior crura. The central part of the ear is shaped like a conch sea shell, and is called the concha. There is a small bump in front of the ear canal called the tragus. On the other side of the concha is another bump called the antitragus.

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Oh and by the way don’t go looking up the thread depth in some Zeus Book or some such thing. Just multiply the pitch by .614

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So next time you cut a thread don’t guess the number of passes uses this formula it’s dead easy. You can also loose weight if you do this as part of a calorie controlled diet.

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Our free speed and feed calculator can be used to determine the spindle speed (RPM) and feed rate (IPM) for the specified cutting conditions, as well as the ...

To cut a thread with a long hand G code program would take ages. Just one thread could need 30 lines of code. So to me that means loads of opportunities to screw up and it’s complicated.

And not to mention all that boring maths that you will have to do. You remember that teacher with the beard that kept banging on about ratios and differentiation? Well, maybe you should have paid more attention.

Because of the increased maternal estrogen levels seen in infancy, infant ears are very moldable, soft, and responsive to external ear molding during the first few weeks and months after birth. Learn more about ear molding.

Keep it simple on your first attempt. That means missing out as much as possible. Cut your thread in fresh air (no component in the chuck). Then you can play around with all the little adjustments and watch what they do. This engineering business is so much fun. Oh and slow the speed down when you are testing it so you can see exactly what is happening. You can get ready with the E Stop.

Run your spindle really slow (like 100 rpm) that way you can stop the machine with the E Stop if it looks like it’s going to collide with a shoulder.

With method three you get a nice even cut with less chatter and less tool wear. It’s also kinder to your insert and better for the environment.

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To be honest it just looked way too complicated. Then one day when my counselling sessions had finished I gingerly opened the big yellow book and decided once and for all to conquer it.

Hi, Thanks for this post, everything works fine, however there is a factor which is not being controlled, The tool when going the rapid move out of the thread, it is touching the work piece, so it is making double thread ( main thread is getting messed up). Any suggestion how to solve this issue.

The causes of ear deformities are varied. Most ear deformities are congenital, meaning they are present from birth. In rare cases, children develop ear deformities from trauma or disease.

At The Children’s Hospital of Philadelphia, we believe every child with an ear deformity at birth should be examined by an experienced multidisciplinary team to consider if nonsurgical treatment could improve the appearance of the child’s ear. Early intervention is crucial and may help children avoid surgery later.

Some ear deformities are temporary. If the deformity was caused by abnormal positioning in the uterus or during birth, it may resolve as the child grows, the ear unfolds and takes on a more normal form.

Every person on your child’s team has the same goal: to give your child the best possible care. We provide medical care, emotional support and much more.

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Abnormal development or deformities of the ear anatomy can cause a range of complications, from cosmetic issues to hearing and development problems. An estimated 6 to 45 percent of children are born with some sort of congenital ear deformity.

An outstanding share! I have just forwarded this onto a coworker who was conducting a little homework on this. And he actually bought me lunch due too thhe fact that I found it for him… lol. So let me reword this…. Thank YOU for the meal!! Butt yeah, thanks for spending the time to talk anout this matter here on your blog. php patterns

It is where the tool plunges into the thread and the cut gets wider and therefore is more prone to chatter as it deepens. It is going straight down the centre of the thread vee.

When you cut a thread you get push off on the last cut so you can go over this a few times to get the correct size. These extra cuts are called spring passes. It depends on the material as to how many you will need.

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Other ear deformities will need medical intervention – either nonsurgical or surgical – to correct the ear anomaly. Because it’s unknown which ear deformities will correct on their own and which will not, it’s important to discuss treatment options as early as possible.

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Where does this formula come from for using the square root to determine the depth of successive passes? Why not just divide it up into equal sections?

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The ear is made primarily of cartilage covered by skin. The earlobe has no cartilage and is made of skin and fat. Although there are some muscles attached to the ear, most people cannot control them, which is why only a small percentage of people can wiggle their ears. The external ear is supplied by four different sensory nerves.

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As I said above when I started googling G76, it’s not a pretty sight. For one there’s not that much information and not least of all some of it is wrong.

G76 has a P value of 1 to 4 (P1 P2 etc). This determines the four different methods you can use. My advice is just ignore them all and use P2. This means the tool cuts by alternating between the two sides of the thread as above. You will also need to input A60 for the angle of the tread.

(3) Alternate flank Cut: Switched from side to side cutting down the flank of the thread. A60 P2 if you have the option.

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Sounds daft I know but you can miss out a lot of the complicated stuff in the cycle as a lot of the values have defaults (meaning you can miss them out).

I noticed quite a few people posting problems on Machining forums etc and as usual loads of misinformation. I decided to do a search on this and frankly there is “Bugger All”. So here we are.

On a Fanuc control this is either a one line cycle or a two line cycle depending on age of control and parameter setting. Haas is a one line cycle.

Traditional treatment for ear deformities has been to wait until a child is 5 years old to perform surgical correction. However, we have learned that many of these deformities, if treated early, can be corrected nonsurgically with ear molding.

Read this article, no more sleepless nights worrying about G76 Threading Cycle. Myth busting information that simplifies and demystified. Applies to Haas, Fanuc and Mazak ISO

G76threadingexample PDF

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Unfortunately, we do not know which ear deformities will correct by themselves and which will require surgical treatment later in life. For this reason, it’s important to discuss early nonsurgical ear molding with your child’s physician.

Be honest I know what you do, you guess. Well you are not alone actually I think loads of people do this. They guess a depth for the first cut then they just run the cycle and see how many passes they get.

Really, you don’t need to know, it’s just me trying to impress. Most of the cycles on a CNC Lathe are wrongly call Canned Cycles. The correct name for a cycle like G76 Threading Cycle and G71 Roughing Cycle is a Multi Repetitive Cycle. No that’s not an illness it’s the correct name. So don’t start ringing the “no win no” fee lawyers.

1.534 ÷√1   = 1.534      Cut = .000 1.534 ÷√2  = 1.084     Cut = .450 1.534 ÷√3  = 0.885     Cut = .199 1.534 ÷√4  = 0.767     Cut = .118 1.534 ÷√5  = 0.686     Cut = .081 1.534 ÷√6  = 0.626     Cut = .060 1.534 ÷√7  = 0.579      Cut = .047 1.534 ÷√8  = 0.542     Cut = .037 1.534 ÷√9  = 0.511      Cut = .031 1.534 ÷√10 = 0.485     Cut = .026

The way you use this cycle makes a big difference to the way the tool performs. The default above for the Haas G76 Threading Cycle would give you what is known as a “plunge cut”.

G76 Threading Cycle First Line P01   One spring pass       00   Chamfer        60   Thread angle Q       Minimum depth of cut R       Finishing allowance

Step three of “Cut Depth” section appears incorrect. On one hand it says “1.534 / sqrt(10) = 0.4854 this is the value to enter for ‘K’ and the you show K.4854

You tell the cycle the depth, pitch, core diameter, length and maybe a few more “bits n bobs”. Then at the push of a button your thread appears.

X = Core diameter of thread Z = Thread end point K = Depth of thread (as a radius) D = Depth of first cut A = Insert angle (Assumed A0 if not entered) Q = The thread start angle this is used for multi start threads and can be omitted. P = Cutting method (see later explanation, can be omitted) F = Pitch of thread

But then in the next line you show the full gcode and the value for K is the thread depth 1.534 and then .4854 is used for D

Canned cycles repeat each time a position is given. Multi Repetitive Cycles do what the title suggests, they repeat moves within a process. In threading, the cycle creates all the repeated moves needed for the thread to be produced.