Vmc Programming I Thread Milling I Threading Program
Thread milling produces threads with the circular ramping movement of a rotating tool. The lateral movement of the tool in one revolution creates the thread pitch.
Although not as widely used as thread turning, thread milling achieves high productivity in certain applications.
Thread milling should always be the application of choice when:
Machining asymmetric/non-rotating components
Machining materials that cause chip breaking and chip evacuation problems
Machining tough materials that create high cutting forces
Machining against a shoulder or close to the bottom of a blind hole
Machining thin-walled components
Component set-ups are unstable
Tool inventory needs to be minimized
You do not want to risk tap breakage on expensive parts – thread mills can always be removed from the component completely
A machine tool capable of simultaneous movement in the X, Y and Z-axis directions is required
Machine Mate Thread Milling
1.PROGRAMMING FORMAT of Thread milling
(a.) G02 X.. Z. I.. F....
G02 X.. Z. I.. F....
(b.) G42/G41 D. X. F.
G2 X. R. Z-.
X. R. Z-...
G1 G40 X0.
Format Details
** G02/G03 -- Circular interpolation
X, and
Z interpolation coordinates
R, I radius of circle
F --cutting feed
2.Pre-Thread Hole creation
**Thread Profile M24*3mm
thread depth =1.624 mm
minor hole dia =2*thread depth,
so, 1.624*2=3.248
Hence major dia - M24 -3.248(total thread depth)
Pre hole dia for M24 thread=20.752mm
3.Depth of cut & Side Pass calculation
**Thread Pitch/2 mm
3/2=1.5mm, for halfround circle & 3mm for 360' rotate
so G02 X. I.. Z-1.5 F.
G02 X. I.. Z-3.0 F.
**Side Pass
how to set side pass for single threading tools
thread depth 1.624 mm
so, you have to decide to side pass cut amount in mm
suppose i put 4 passes for side cutting
then 1.624/4 =0.406mm/pass
3.Programming example
4.Revision /Summary
Benefits of Thread Milling
The main benefits of thread milling include:
Better Thread Quality: Thread milling can deliver better thread quality than tapping, since it offers a better chip evacuation. Tapping uses a tool the same size as the thread, forcing the chip through the thread for evacuation.
Flexible Tool: The same cutter can be used to produce both internal and external threads, and the same goes for the tool holder. Also, you can use the same tool to make threads with different diameters, as long as the pitch is the same.
Secure Machining Operation: Short chips and low cutting forces make up for a minimal risk for machining stops. Should there be a tool failure, the work piece is less likely to be damaged, as the tool will not be caught since the diameter of the thread mill is less than the thread.
Threading in Difficult to Machine Materials: The superior cutting conditions makes it possible to thread mill materials such as hardened steel up to HRC 65, Titanium, and other materials that are considered difficult to machine.
Threading in Blind Holes: Thread milling will produce a complete thread profile from the top to the bottom of the hole. But when tapping, it´s necessary to drill deeper, as the tap only starts making a complete thread profile on the third thread.
Your Queries
What are thread mills used for?
What is the difference between thread milling and tapping?
What is thread machining?
Do we use threading tool in milling machine?
Is thread milling faster than tapping?
Which of the following are advantages of thread milling?
Can you thread mill with a tap?
What is thread Grinding?
What are tapping tools?
What is thread Grinding?
How do you set up a thread mill?
How do you thread a mill on a lathe?
How do I choose a thread mill?
Content in this video
0:00 | Intro
1:10 | Understand the Threadmilling VS. Tapping
2:42 | Drawing, model / Pre simulation toolpath
3:48 | Programming format
5:42 | Pre Hole calculation
06:40 | Side pass Details
7:40 | Quick view of thread milling cutter
8:40 | Programming Example
13:29 | revision/summary
VMC PROGRAMMING
| THREAD MILLING PROGRAM
| THREAD MILLING PROGRAM
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