G.H. Raisoni College of EngineeringDepartment Of Mechanical EngineeringProject Title:- Design and fabrication of a

nut tapping attachment for drilling machine

Guided by : Dr D J Tidke

Presented by:- Abhishek Gawande A-04

Palash Thuturkar A-50 Niraj Pimplapure A-48

Ajinkya Naydu A-74

CONTENTSIntroductionDesign & assemblyWorking procedureNeed for the attachmentCost estimationAdvantages & applicationsReferences

INTRODUCTIONTapping is the operation of cutting

internal threads in a hole using a cutting tool called Tap.

Most of the industries uses the conventional method -- hand tapping.

Threads are taped by manually rotating & feeding the taps through the drilled hole

This conventional method is very time consuming process, less accurate and includes higher labour cost, and ultimately less productivity.

So there is a scope to develop the machine for tapping operation.

An attachment eliminates the purchasing of a new unit which serves the same purpose.

By implementing an attachment to a unit, the capacity of the unit can be increased which is very economical.

Thus based on the functional and economical aspects we are fabricating a unique attatchment.

Bent shank tap is used for tapping

The size of the bent shank is M-12

The drilling machine motor will provide power to the attachment.

The main advantage for using bent shank tap is that the bent part will provide the indirect drive to the spindle.

Project Design

Design of sliding path and pneumatic cylinder

Nuts will slide through hopper.

Locking arrangement is use so that only single nut will enter the path during tapping.

After tapping of 1st nut the cylinder will go back and next nut will enter into the path.

Spindle Design

Design of Spindle

Sectional View of Spindle

Spindle will be fabricated in two parts

Material used for fabricating the spindle is mild steel

Bent shank tap will fit inside the spindle

Bent Shank TapBent shank tap is

used for tappingSize of tap is M-12Due to bent portion

of shank the nut will move upward and finally it gets collected in the container after tapping process.

Working ProcedureThe taper tap is

connected with a bent rod which is made to rotate at high speed along with the spindle causing rotation of the tap at the same speed.

The blanks are automatically pushed intermittently under the tap and after threading the tap returns but along with the threaded nut.

Finally the accumulated nuts are thrown out form the rod by centrifugal force to come out from the hopper.

the bent shank tap held in a casing which has nuts along the shank and fit the cavity. The casing is provided the drive by drilling machine spindle. Nut feeding and spindle operating mechanisms are also designed.

Also we have designed the path for the feeding of the nut.

Nut will be pushed forward using pneumatics.

After tapping, the nut will move along the shank and at the end, it will get collected in the container.

NEED FOR ATTACHMENT•In recent years, new fabrication

techniques have been developed to satisfy the technological demands. Moreover, emphasis is stressed on attachments.

•Attachments are used in various fields and machines depending upon the needs to be fulfilled and mode of operation.

•An attachment eliminates the purchasing of a new unit which serves the same purpose.

For example, a lathe occupies a place opposite to that of a milling machine, the ten machines mainly used to produce cylindrical and plain surfaces respectively.

By implementing an attachment to a unit, the capacity of the unit can be increased which is very economical.

COST ESTIMATIONItems Estimated Cost

Bent Shank Tap (2 pieces) 4900

Piston cylinder arrangement 1500

Compressor 2000

Hexagonal blanks 100

Material cost 1000

Fabrication works 5000

Motor ,gears ,switches & casing 2000

TOTAL ESTIMATED COST 16500

AdvantagesNo need for doing tapping separately. The extra power required to do the tapping is reduced.Time is reduced.Minimum number of components, so the maintenance of the assembly is easier.No skilled operators are required.Enables high production rate.The attachment is less expensive.Consumes less floor area.Noiseless and smooth in operation.The attachment is auto reversible

REFERENCES

nptel.iitm.ac.in/en.wikipedia.org/www.youtube.com/?gl=INwww.howstuffworks.com/

Thank You