Design and Manufacture of Machine Accessory

Machining Processes and Metrology ProjectSubject code: MEE 217Slot: G2GROUP- 3Kunal Agrawal- 11BME0011Ankit Singh - 11BME0017Harshit Mishra - 11BME0058

Yashovardhan - 11BME0083Ashka - 11BME0100Neeraj Dhole - 11BME0103Radhika Goyal - 11BME0425

What is a LATHE DOG???

• A lathe dog, also known as a lathe carrier is a device that clamps around a work piece and allows the rotary motion of the machine’s spindle to be transmitted to the work piece.

• Use: for turning between centers in conjunction with a drive plate and drive pins• Types: straight leg or bent leg type

MAKING OF LATHE DOG:

Procedural steps involved:•Basic workpiece•Drilling •Circumferential hole• Tapping

1.Basic workpiece:

• Lathe settings• Cylindrical ms work

piece • Dimensions: 42 mm

diameter and 27 mm height• Turning and facing• Final work piece: 40

mm diameter with 25 height.

2.Drilling:

• Machine used: Lathe • Horizontal drilling machine• Speed of lathe : 450 rpm• 25 mm through hole• Tools required:Drill chuck; chuck key; center drill(60 degree taper); drill bits of sizes 10mm, 20 mm, 25 mm diameter.

• Center Drill • 10mm Drill

• 20 mm drill bit • 25 mm drill bit

3.Circumferential hole

• Upright drilling machine • Center punch• Initial touch • Manual feed• 8 mm diameter• Through hole on one

side thickness

4.Tapping

• Tool: 3/8 inches BSW tapping tool• Taper• Plug• Bottoming

FINAL WORKPIECE

How Does It work??

Components required:

• Face plate • Supporting rod and fasteners• Dead center, live center• Lathe dog and workpiece

Pre-requisites:• The workpiece must be center drilled on both

end faces for the holding purpose.

• The entire set up is in conjunction with the face plate, which acts like a secondary holding device, holding the carrier pin and live center.

• Face plate holds the live center whereas dead center is attached to tail stock.

• The work piece passes through the lathe dog, which is equipped with a locking screw and its center drilled ends fitting into live center and dead center.

• The supporting pin and the locking pin are perpendicularly touching each other so as to enable the rotation of lathe dog along with the face plate.

Project Limitations :

• Design Consideration - Choosing the proper shape and size of the dog. As the lathe dog rotates, its swing diameter over the lathe bed should not be too much.• Speed Consideration – Spindle speeds are

reduced due to the unbalanced nature of the set up.• Size consideration – The maximum work piece

diameter we can turn is 25mm

Thank you !