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7 Centre Lathe Machine Attachment that enhance Lathe Applications

7 Centre Lathe Machine Attachment that enhance Lathe Applications

Why Attachments are Necessary ?

Each general purpose conventional machine tool is designed and used for a set of specific machining work on jobs of limited range of shape and size. But often some unusual work also need to be done in a specific machine tools, e.g. milling in a lathe, tapping in a drilling machine, gear teeth cutting in shaping machine and so on. Under such conditions, some special devices or systems are additionally used being mounted in the ordinary machine tools. Such additional special devices, which augment
the processing capability of any ordinary machine tool, are known as Attachments, Unlike accessories, Attachments are not that inevitable and procured separately as and when required and obviously on extra payment. Some attachments being used in the general purpose conventional machine tools are :

 
In centre lathes :
  1. Taper turning attachment
  2. Copy turning attachments
  3. Milling and cylindrical grinding attachments
  4. Spherical turning attachments
  5. Relieving attachment 
  6. Grinding Machine attachment For Lathe
  7. Indexing Table Attachment For Lathe 
1) Taper turning attachment

Taper turning attachment Taper cylindrical surface, which is a very common feature of several engineering components, is generally produced in lathes in a number of methods, depending upon length and angle of the tapered position of the job, such as offsetting tailstock, swivelling the compound slide using form tool and combined feed motions. But jobs with wide ranges of length and angle of taper, are easily machined by using a simple attachment, called taper turning attachment. Fig.  schematically shows a taper turning attachment where the cross slide is delinked from the saddle and is moved crosswise by the guide block which moves along the guide bar preset at the desired taper angle. Thus, the cutting tool, which is fitted on the cross slide through the tool post and the compound slide, also moves along with the guide black in the same direction resulting the desired taper turning.

diagram of taper lathe machine
Taper Turning Attachment
2) Copy turning attachment 

There are two common types of copy turning;
  1. Mechanical type
  2. Hydraulic type 
Mechanical copying A simple mechanical type copy turning attachment has been schematically shown in Fig.. The entire attachment is mounted on the saddle after removing the cross slide from that. The template replicating the job-profile desired is clamped at a suitable position on the bed. The stylus is fitted in the spring loaded tool slide and while travelling longitudinally along with saddle moves in transverse direction according to the template profile enabling the cutting tool produce the same profile on the job as indicated in the Fig.

Copy turning attachment for lathe machine
Copy Turning attachment
3 ) Milling attachment

This is a milling head, comprising a motor, a small gear box and a spindle to hold the milling cutter, mounted on the saddle after removing the cross slide etc. as shown in Fig. Milling attachments are generally used for making flat surfaces, straight and helical grooves, splines, long and deep screw
threads, worms etc. in centre lathes by using suitable milling cutters.

Diagram oF milling machine attachment for lathe machine
Milling Machine Attachment
4) Grinding attachment 

Grinding attachment is very similar to milling attachment. But in the former, there is no gear box and the spindle speed is much higher as needed for grinding operation. Such attachments are employed for external and internal cylindrical grinding, finishing grooves, splines etc. and also for finish grinding of screw threads in centre lathe. But unlike dedicated machines, attachments cannot provide high accuracy and finish. 
Grinding Machine Attachment for lathe machine
Grinding Machine Attachment
5) Spherical turning attachments 

These simple attachments are used in centre lathes for machining spherical; both convex and concave surfaces and similar surfaces. Fig. schematically visualizes the usual setting and working principle of such attachments. 

Spherical turning attachments

6) Relieving attachment

The teeth of form relieved milling cutters like gear milling cutters, taps, hobs etc. are provided with flank having archemedian spiral curvature. Machining and grinding of such curved flanks of the teeth need relieving motion to the tool (or wheel) as indicated in Fig. 
 Diagram Of Relieving attachment
Relieving attachment
. The attachment schematically shown in Fig. is comprised of a spring loaded bracket which holds the cutting tool and is radially reciprocated on the saddle by a plate cam driven by the feed rod as indicated. 


There are many of lathe accessories including various centres, extensions & tool rests also various type of tool holder, chuck, headstock. Similarly to this principal we design Multipurpose indexing device. This device is generally  used for lathe tool post. Our project is depending upon the worm and worm gear for the indexing purpose to index the tool post.

Diagram Of Indexing Device Mechanical Project
Indexing Device Mechanical Project
APPLICATION-
  • Milling curved slots.
  • Drilling a bolt holes circle around the circumference of a  parts    
  • Chamfering the job of any angle by using straight tool.
  • Indexing the job as well as tool.
  • Drilling complex shape parts.
  • For cutting the arcs

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