making of lathe dog
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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
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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.
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• Use: for turning between centers in conjunction with a drive plate and drive pins• Types: straight leg or bent leg type
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MAKING OF LATHE DOG:
Procedural steps involved:•Basic workpiece•Drilling •Circumferential hole• Tapping
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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.
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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.
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• Center Drill • 10mm Drill
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• 20 mm drill bit • 25 mm drill bit
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3.Circumferential hole
• Upright drilling machine • Center punch• Initial touch • Manual feed• 8 mm diameter• Through hole on one
side thickness
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4.Tapping
• Tool: 3/8 inches BSW tapping tool• Taper• Plug• Bottoming
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FINAL WORKPIECE
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How Does It work??
Components required:
• Face plate • Supporting rod and fasteners• Dead center, live center• Lathe dog and workpiece
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Pre-requisites:• The workpiece must be center drilled on both
end faces for the holding purpose.
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• 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.
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• Face plate holds the live center whereas dead center is attached to tail stock.
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• 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.
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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
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Thank you !