Presented by: Project Guide: Utsav Vyas(06m58) Mr.N.A.PATEL Mahendra Gelatar(D07m63)Hardish Trivedi(06m55)

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A Rotary Table is a precision work positioning device used in metalworking. It enables the operator to drill or cut work at exact intervals around a fixed (usually horizontal or vertical) axis.

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Some rotary tables allow the use of index plates for indexing operations, and some can also be fitted with dividing plates that enable regular work positioning at divisions for which indexing plates are not available.

A rotary fixture used in this fashion is more appropriately called a dividing head (indexing head). Rotary indexing tables are used to index parts and components in defined, angular increments so that they can be machined, worked, or assembled in multiple operations.

The Tables effect substantial savings in time and money in a wide variety of applications. For example.

The Tables permit fast, automatic feeding of parts to tools in machine and assembly operations. Parts can be loaded and unloaded while machining operations continue.

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Because It Has Following Advantages… Rotary indexing machine provide flexibility for

handling or machining multiple components.

Suitable for mass production

It is easy and time saving method for machining multiple components .

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It provide precise angular increment. Due to that we get higher precision.

By using of rotary indexing turn table we can get Higher accuracy and tolerance.

It perform function like jig and suitable for NC and CNC machines also.

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Its reduces manual labour work as its partially automated machining process.

Its increase versatility and utilization of machine tools.

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To machine spanner flats on a bolt. To drill equidistant holes on a circular flange. To cut a round piece with a protruding tang. To create large-diameter holes, via milling in

a circular tool path, on small milling machines that don't have the power to drive large twist drills (>0.500"/>13 mm).

To mill helixes.

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To cut complex curves (with proper setup) to cut straight lines at any angle to cut arcs with the addition of a compound table on top of the

rotary table, the user can move the center of rotation to anywhere on the part being cut. This enables an arc to be cut at any place on the part.

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Additionally, if converted to stepper motor operation, with a CNC milling machine and a tailstock, a rotary table allows many parts to be made on a mill that otherwise would require a lathe.

Rotary tables are

most commonly

mounted "flat", with the

table, the tool rotating

around a vertical axis, in

the same plane of a

vertical Milling Machine

or Drilling Machine.

• An alternate setup is

to mount the rotary table

on its "flat" on a 90°, so

that it rotates about a

horizontal axis. In this

configuration a tailstock

can also be used, thus

holding the work piece

"between centers."

•A tilting rotary

table provides all of

the benefits of the

4th axis integration

described above,

plus an extra axis of

titling.

•. The table shown is a manually operated type.

•The Angular Incremental Feed is given by using Stepper Motor .

•Mainly used in CNC Machines.

Horizontal Type Manual Rotary Turn Table For Radial Drilling Machine using worm and worm wheel as an indexing mechanism.

The worm and worm wheel has a unique table locking mechanism that is positive and does not move the table as it is locked.

As it provide accuracy and frictionless movements.

Rotary tables are made with a solid base, which has provision for clamping onto another table or fixture.

The actual table is a precision-machined disc to which the work piece is clamped (T slots are generally provided for this purpose).

This disc can rotate freely, for indexing, or under the control of a worm (hand wheel), with the worm wheel portion being made part of the actual table. High precision tables are driven by backlash compensating duplex worms.

Main Body Table Worm And Worm

Wheel with Indexing

Assembly Hand Wheel

Assembly Bearings

Design is based on Bending And Wear Failure.

Following Dimensions are Obtained Pressure angle=20 deg. Pitch circle dia of worm=30mm Numbers of Starts=3 Module=5 Type of Worm=Right Hand

Lead angle=27deg. Addendum=5mm Dedendum=4.8mm Clearance=0.891mm Length of Worm=82mm Axial Pitch=15.708mm

Addendum=3.91mm Dedundum=5.892mm Addendum Dia.=187.82mm Dedundum Dia.=168.218mm Face Width=32mm.

Popular Machinist(journal)

Five hundred and seven Mechanical movement by Henry T.Brown

Transmission system Design By Haideri.

Machine Design By Sharma And Agrawal.

www.wikipedia.org www.howstuffwork.com www.googlevideo.com www.books.google.com www.pdf-search-engine.com

Siddhapura Machine Tools. Bhavya Machine Tools.

Presented by: Utsav Vyas(06m58) Mahendra Gelatar(D07m63) Hardish Trivedi(06m55 )