Design Of Milling Fixture

Prepared by: NILESH D PATEL Roll no.: L081040005 T Y B TECH (PRODUCTION)

1. Milling of Reference Surfaces A , B & C

B C A

 Location

 Clamping  Loading & Unloading

Location is principle.

done

using

3-2-1

locating

 Surfaces A, B & C are used for locating purpose.  Locating pads, Ring, Cams & pin are used to located surface A, B, C on the fixture, to increase the accuracy of the workpiece

1. Loosen the clamps. 2. Place the job on the base and locate it on three surfaces. 3. Align the job by adjusting and then tighten the clamp in 90 º 4. See that all the fasteners are secured, so as to maintain the accuracy of workpiece

1. Loosen the clamps.

1. 2. 3. 4. 5. 6. 7.

Base plate Strap Clamps Dowel Nut Soc. Headed cap screw Setup block Tenon

1 3 2 1 4 1 2

1. Base plate is made out of cast iron. 2. The Boss is provided for clamping on the machine table. 3. Holes have been drilled for fixing angle plate & setup block.

1. These are made of rectangular plates and acts like levers. 2. The clamp is tightened by rotating an hexagonal nut. 3. One end of clamp presses against the workpiece 4. It take care of any variation in workpiece

1. Resting

pads locate

the component

component. 2. It also helps in swarf removal.

and supports

the

This are meant for fastening purpose.

1. Milling fixture are generally fixed with locating tennons. 2. These are fixed in slots machined on the resting face on the base. 3. Tennons are made close sliding fit in machine T – Slot. 4. Tennons align milling fixture with the longitudinal stroke of the machine.

1. Suitable cutter setting pieces should be provided for easy & accurate tool setting. 2. Gap of 0.4 – 0.5mm facilitates cutter setting with the help of the feeler gauge.