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Capstan & Turret Lathe-Introduction,Working,Advantage,Difference

Capstan and Turret Lathe:

Introduction:

CAPSTAN LATHE MACHINE

  • A  Capstan and Turret lathe is a production lathe. It is used to manufacture any number of identical pieces in the minimum time.
  • It was modified of engine lathes.
  • They were first developed in United State of America by PRATT and WHITNEY IN  1860.
  • Capstan and turret lathes are Semi-automatic lathes that help in making the Auxiliary motion quick and accurate.
  • The Tail stock is replacing with an index able multi station tool head.
  • Turret head has a Hexagonal block having six faces with a bore for mounting six or more than six tools at a time. The threaded hole on these faces are used to hold the tools.

Brief working:

  • The work piece is holding in collect or chucks which are actuating hydraulically or pneumatically. On the turret head, all the tools are holding in the respective holes.
  • The tool is moving with the help of turret head, according to the sequence of operation.
  • Drilling, boring, turning, reaming, threading tools are mounting on the turret head.
  • Forming, Chamfering, Knurling tools are mounting on the front end of the turret.
  • The Parting tool is mount in an inverted position on the rear end of the turret.
  • The turret head is moving back to its initial position after completing each operation where indexes the tools automatically.

Advantages

  • The production rate is high.
  • Different ranges of speeds are obtain.
  • A number of tools can be accommodated.
  • Less skill operators are required hence lowers the labor cost.
  • Higher rigidity so can withstand heavy loads.

Difference Between Capstan and Turret lathe

CAPSTAN AND TURRET LATHE MACHINE

 

S. No.

Capstan lathe

Turret lathe

1. The turret head is mounted on the ram and the ram is mounted on the saddle. The turret head is directly mounted on the saddle and the saddle slides over the bed ways.
2. The saddle is fixed during machining. The saddle is moved along with the turret head during machining.
3. The turret head can’t be moved crosswise. The turret head can be moved crosswise.
4. The lengthwise movement of turret is less. The lengthwise movement of turret is more.
5. Maximum bar size is up to 60 mm.  Maximum bar size is up to 200 mm.
6. Collect is used to hold the work piece. Jaw chuck  used to hold the work piece.
7. Rate of tool feeding relatively faster. Rate of tool feeding relatively slower.
8. It is a light weight machine. It is a heavier machine.
9. It has a simple tool head. It has hexagonal tool head.
10. Automatic indexing. Manual indexing.

Capstan and Turret Lathe Tools

  1. Turning tool
  2. Facing tool
  3. Parting tool
  4. Forming tool
  5. Chamfering tool
  6. Drilling
  7. Boring tool
  8. Counter bore
  9. Reamer
  10. External thread cutting tool
  11. Internal thread cutting tool
  12. Workstop

1. Turning tool

Turning tool Capstan & turret lathe

  • Turning tool is mounted on the cross-slide or knee holder.
  • Hollow mill  is a special turning tool used in capstan and turret lathe.

2.  Facing tool

Facing tool Capstan & turret lathe

  • Facing tool may be mounted on the cross-slide or on the knee tool holder.

3. Parting tool

 

PARTING OFF TOOL

  • The tool is mounted on the rear tool post.
  • All round clearance is given on tool to clear the work while cutting.

4. Forming tool

FORMING TOOL

  • The forming tools may be straight or circular type.

5. Drill

DRILL BITE

  • A drill is a tool primarily that use for making round holes or driving fasteners.

6. Boring tool

  • The boring tools mounted on boring bars are used for enlarging a hole in a capstan or turret lathe.

7. Counter bore

  • The counter bores are used for enlarging the drilled hole from one end.

8. Reamer

  • The reamer are used for sizing and finishing a hole.
  • Reamers may have two or more straight or helical flutes in the body.

9. External thread cutting tool

 

  • External thread are cut on a job in a capstan or turret lathe by using any one of the following tools:

a. Solid button dies

b. Chasers

  1.  Radial chaser

Radial chaser Capstan & turret lathe           ii.Tangential chaser

Tangential chaser Capstan & turret lathe                 iii.Circular chaser

Circular chaser Capstan & turret lathe

 

c. Single point tools

Single point tool Capstan & turret lathe

10. Internal thread cutting tool

Internal thread cutting tool Capstan & turret lathe

  • The internal thread may be cutting in a capstan or turret lathe by using any one of the following tool:-

a. Solid tap

b. Collapsible tap

c. Single cutting tool or chaser

11. Chamfering tool

Chamfering tool Capstan & turret lathe

  • The chamfering tool is mounting on the four station turret on cross-slide.
  • The extreme longitudinal position of the saddle is adjusting for stop.

12. Workstop

  • It is a cylindrical bar whose position can be adjusting relative to the spindle nose by the turret stop.
  • In some workstops, micrometer graduations are provided for accurate setting.

Workstop Capstan & turret lathe

Work Holding Devices & Tool Holding Devices
S.NO

.

Work Holding Devices Diagram S.NO. Tool Holding Devices
Diagram
1. jaw Chucks 1. Straight cutter holder
b. Self centering chuck 2. Multiple cutter holder
c. Independent chuck 3. Offset cutter holder
d. Combination chuck 4. Combination tool holder
e. Air operated chuck 5. Knee tool holder
2. Col let chucks 6. Slide tool holder
a. Push out type 7. Knurling tool holder
b. Draw in type 8. Boring bar holder
c. Dead length type 9. Recessing tool holder

 

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