DDT Test 6

Reference Dimension

Dimension in parenthesis

Counterbore Hole

Cylindrically enlarged hole for a specific depth

Casting

Pouring molten metal into a hollow cavity

Countersunk Hole

Hole enlarged conically in one end

Blind hole

A that does not go pass through a part

Fillet

Inside corners

Rounds

Outside corners

Flats

Machines into cylindrical surface to provide drilling start points

Microinch

.000001 Inch

Micrometer

.000001

Chamfer

Reduce sharp corners on edges

Finish allowance

additional material allowed, .125

Half View

Cuts a symmetrical drawing in half

Keyseat

Located in shafts

Keyway

Located in hubs

Clearance Hole

1/32 holes larger than fastener

1/8 in

Finish allowance

1/32 in

Size difference between fastener and clearance hole

Deep

Down arrow

Counterbore

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Countersink

V

Material Removal Required

Checkmark

Material removal prohibited

rounded checkmark

Centerline

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