CCD-245-Supporting - locating Review

What is referencing?

the work piece must be properly positioned with respect to the cutting tool

What 4 things must the tool designer provide?

1. Accurate positioning of the part

2. rigid support for the part

3. facilitate loading and unloading

4. correct part orientation or fool proofing

When choosing how to locate the workpiece, what is the order?

1. a hole

2. 2 machined surfaces at right angles to each other

3. 1 machined and 1 unmachined surface at right angles to each other

what tolerance should the tool have in relationship to the part tolerance

20% to 50%

What is fool proofing

place locators to unsure part only fits one way

what is the rule for placing locators?

space locators as far as possible but not to the extreme

why should you use button or pin locators?

to limit contact when machining chips are a problem

What are the three types of supports used for flat surfaces?

1. solid supports: can be machined into the tool body or base for machined part surfaces

2. adjustable supports: used for castings and forgings with rough or uneven surfaces

3. equalizing supports: provides contact on two surfaces at once

What is the only purpose of a clamp?

they only hold the workpiece against the locators - they are not allowed to locate the parts

What are the 3 basic forms of locating?

1. plane

2. concentric

3. radial

what’s the best way to locate a cylindrical workpiece?

V-Block (centralizing feature)