During machining, the thickness of the chips being produced can vary from thick-to-thin. This can have a significant impact on the machining process, as thick chips can cause problems with chip evacuation and tool wear, while thin chips can help reduce heat generation and improve surface finish. Understanding the effects of thick-to-thin chip formation is important when milling titanium, as it can help you adjust your machining parameters and achieve better results.

When machining titanium, it is essential to use tools that are specifically designed for the material. Titanium is extremely hard to machine and can quickly wear down inferior cutting tools, resulting in poor surface finishes, tool breakage, and other issues. Look for cutting tools made from high-performance materials such as carbide, which can withstand the high temperatures and pressures generated during titanium machining. You should also choose tools with a high number of teeth to reduce the load on each tooth and prevent tool wear.

G76threadingexample PDF

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

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.

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.

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.

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)

Arc In is the steady entry of the tool into the workpiece, while chamfer is the angle at the cutting edge of the tool. Both factors can have a significant impact on the performance of your cutting tool when machining titanium. Make sure when machining to program thick-to-thin-arc instead of a straight path which will help avoid sudden jarring changes in cutting forces. And program your chamfer to avoid unstable left-over materials.

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”.

G76CNC threadingprogram examples

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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.

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.

Cnc threadingmachine

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

Cnc threadingpdf

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CNCthread cutting

It's important to adjust your feed and speed settings to achieve optimal performance. Lower cutting speeds may be necessary to maintain a consistent cutting temperature when used on titanium. However, it's important to balance this with an appropriate feed rate to ensure that you achieve optimal chip evacuation and prevent excessive tool wear.

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

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

If you are new to machining titanium or are having trouble achieving the desired results, it is important to seek expert advice. Kennametal has experts who understand titanium and the tools used for machining it. By leveraging expert knowledge and experience, you can improve your machining results and avoid costly mistakes.

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.

Secondary relief is an additional relief angle ground into the back of the cutting tool, which can help to reduce the risk of chipping or breakage, stabilize cutting edges and increase clearance. This can be particularly important when machining titanium, which can be highly difficult to work on. With todays advanced designs, you’ll find many tools utilizing eccentric ground edges specifically targeted toward titanium. These designs offer the proper clearance behind the eccentric relief. They are very effective and tend to feature a stronger edge and last longer. Kennametal’s HARVI™ III high-performance aerospace end mills are only one example of what is offered in the line.

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.

Mar 25, 2024 — Enter the stock diameter and rotations per minute (RPM) into the calculator to determine the surface speed.

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Coatings and grades can be highly effective in improving the performance of cutting tools when machining titanium. Titanium nitride (TiN), Titanium Carbonitride (TiCN), Titanium Aluminum Nitride (TiAlN), Aluminum Titanium Nitride (AlTiN), and Aluminum Chromium Nitride (AlCrN)   are common coatings for cutting tools, as they offer improved wear resistance and reduced friction. However, there are more advanced coatings that have multiple layers and provide more protection against chip building and tool wear. For example, high-performance solid carbide end mills used in aerospace applications can help you improve performance when machining titanium.

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

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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Coolant pressure plays an important role in machining titanium. It is a difficult material and generates a significant amount of heat during cutting. Using high-pressure coolant can help reduce chip adhesion by flushing them away from the cutting area and cooling the workpiece and cutting tool. Additionally, using a chip conveyor or other means of automatic chip removal can further improve chip evacuation and reduce the risk of tool breakage.

Titanium is a highly valuable and sought-after material used in a wide range of industries, including aerospace, medical, and automotive. While it offers many benefits, such as excellent strength-to-weight ratio and corrosion resistance, it is also notoriously difficult to machine, making it a challenging material for many metalworking professionals. Here, you’ll discover 10 tips for machining titanium when milling, which can help you achieve better results and improve your productivity.

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.

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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Radial engagement is an important factor to consider when milling titanium. This refers to the amount of the cutting tool that is in contact with the workpiece at any given time. When radial engagement is decreased, the surface speed can be increased to maintain the optimum temperature at the cutting point.  By optimizing the radial engagement, you can improve chip evacuation and reduce the load on each tooth of the cutting tool, which can increase tool life and improve surface finish.

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.

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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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

Machining titanium can be a challenge, but with the right techniques and tools, you can achieve high-quality results and improve your productivity. By understanding the benefits and challenges of machining titanium, choosing the right cutting tools, using proper radial engagement and coolant pressure, monitoring tool wear, and seeking expert advice, you can optimize your machining process and achieve better results.

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

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

Tool deflection can occur when the cutting tool bends or flexes during machining. This can result in poor surface finishes, tool breakage, and other issues. To avoid tool deflection, use cutting tools with a higher number of teeth, and consider reducing the cutting depth or width to reduce the load on each tooth of the cutting tool.

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.

Climb milling, or thick-to-thin chip formation is the ideal way to make sure you are getting the proper results. It begins with the cutting edge entering the excess material and exiting on the finished surface – meaning the cutter tries to climb over the material, ensuring that thick chips absorb cutting heat, decreasing adhesion from cutting pressure and the thin chip exits effectively. The exception to this is to conventional mill when you have an Alpha case in order to remove the thick harden skin, shearing from the softer surface below to create a clean surface, and then revert back to climb milling once the skin is removed.

High-speed machining techniques can be highly effective when milling titanium. This involves using high high-feed rates taking lighter cut using dynamic paths to achieve optimal cutting conditions. By increasing the speed of the cutting tool, you can reduce the amount of heat generated during cutting, which can help improve surface finishes and reduce tool wear.

Titanium is a strong, lightweight metal ideal for a range of applications. However, it can be difficult to machine due to its high strength, low thermal conductivity, and chemical reactivity. Additionally, titanium can generate high temperatures and cutting forces during machining, which can cause tool wear and damage to the workpiece.

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.

G76threadingcycle formula

CNC threadingprogram examples

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

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G92threadingcycle

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.

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.

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When dealing with thick-to-thin chip formation, it is important to pay attention to the chip breaker design on the cutting tool. A chip breaker is a groove or notch on the cutting edge that helps to break up the chips into smaller, more manageable sizes. A well-designed chip breaker can help to prevent these issues and improve overall machining performance.

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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.

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.

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

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.

Tool wear is a common problem when machining titanium. To prevent tool wear and damage to the workpiece, it is important to monitor your cutting tools regularly and replace them when necessary. You should also adjust your machining parameters if you notice signs of tool wear, such as poor surface finish or increased cutting forces.

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.

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.