Turning thread on a Lathe

Methods turning lathe screw.

There are several methodof turning thread on a lathe
1 The conventional method
The conventional method is a method of movement threading with feeds (additional incision depth / depth of cut), upright / using the cross slide.
2. Method slice one side
This threading method by tilting the top of the slide and use the top slide 60 as funeral movement (depth of cut). This method is efficient for turning lathe the screw with a large size




 

The steps turning lathe the screw outside.
1 Prepare working drawings
Prepare working drawings and understand the dimensions of the image in accordance with the demands of work. It is important that during the turning lathe process the error does not occur
 
2 Prepare the cutting tools.
Several pieces of equipment that need to be prepared is
a. Flat Tool bit / ISO 6 to turning lathe the outer diameter of the screw
b. Tool bit face chamfer / ISO 2 for turning lathe face and make pingul or chamfer
c. Tool bit grooves / ISO 7 for turning lathe groove when liberators threading
d. Metric for turning lathe Tool bit threaded screw
 
3 lathe major diameter for outside thread
For turning lathe threaded outside diameter of the major outside screw is usually reduced by 0.2 mm, with the goal threading process occurs when built-up chip on the top of the screw, the screw outside diameter and will fit easily on the fitting time. For example, the M10 threaded turning lathe prior to threading turner diameter is 9.8 mm.
 

4 Make relief threaded grooves
relief or undercut grooves need to be made in order to not hit the chisel threading time on the corner / elbow on the turning lathe screw diameter and so the Shoulder time can be tight fitting with the corner / elbow
 
5 Set the peak spacing (pitch) desired
Adjust the pitch in accordance with the demands of the picture by looking at the table and turning the screw automatic gear lever on the gearbox feed according to the table. For example ......
 

6 Checking the suitability of the pitch screw
To check the suitability of the pitch is done turning lathe the screw thread with depth as thin as possible and then be checked with mall thread / pitch gauge.
 

7 turning thread
After the turning lathe screw can fit was done with the addition of an incision depth of 0.1 each. Fatherly finishing process adding a depth of 0.02 mm and an incision made ​​2-3 times at the same depth
 

Steps turning lathe inside thread.
In turning lathe inside thread on the same principle just different on the cutting tool and the Flat size of the turning lathe before threaded
1 Prepare working drawings
 
2 Prepare the cutting tools.
Cutting tools used another conduction
a. Center drill
Center drill is used to make holes in the prefix drilling holes in lathe
b. twist drill
Used to make the initial hole on the turning lathe thread
c. Tool bit ISO 8 / ISO 9
Once perforated with a twist drill is then done enlarged hole boring process with ISO 8 for through hole and ISO 9 for shoulder hole
d. Relief internal Groove tool bit
if thread not through it needs to make a groove for the release screw with a internal groove toolbit
e. Screw Tool bit inside
Used for turning lathe thread
 

3 Minor diameter lathe to thread
On the turning lathe screw in the hole that is the diameter of the major turner reduced pitch screw (threaded peak distance). For example Screw M16 x 2 the diameter of the hole made is 16-2 = 14 mm. and that the threaded fitting easier usually minor diameter plus 0.2 mm so that the diameter is 14.2 mm turner. to the next process in the same turning lathe with turning lathe screw threaded outside
 

4 Make relief threaded grooves
 
5 Set the peak spacing (pitch) desired
 
6 Checking the suitability of the pitch screw with pitch gauge
 
7 turning the thread until finish

Pics From :
 http://www.educationlite.com/lathe-machine-operations-shoulder-turning-thread-cutting-boring/
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