Flashcards
Indexing
Cards in this deck (13)
- 1PurposeUsed to divide circumference of work
piece into equally spaced divisions
when milling gear teeth, squares,
hexagons, octagons, etc. - 2Indexing head parts- Headstock with index plates
- Headstock change gears
- Quadrant
- Universal chuck
- Footstock
- Centre rest - 3Indexing head parts (img)
- 4Indexing head parts (simple; img)
- 5Indexing head parts (simple)- Swiveling block
- Spindle
- Worm
- Direct indexing plate - 6Methods of Indexing1. Direc
2. Simple
3. Angular
4. Differential - 7Direct Indexing- Performed by disengaging worm shaft from worm wheel by means of eccentric device in dividing head.
- Used for quick indexing of workpiece when cutting flutes, hexagons, squares, etc. - 8Direct Indexing DivisionsDirect indexing plate usually contains three sets of hole circles or slots:
24, 30, and 36.
-> Number of divisions possible to index limited to numbers that are factors of 24, 30, 36. - 9Simple Indexing- Work positioned by means of crank, index plate, and sector arms.
- Worm shaft attached to crank must be engaged with worm wheel on dividing head spindle: 40 teeth on worm wheel, One complete turn on index crank causes spindle and work to rotate one-fortieth of a turn (ratio of 40:1). - 10Formula of the indexingIndexing = 40 / N
N = number of divisions to be cut - 11Index plateCircular plate provided with series of equally spaced holes into which index crank pin engages
- 12Sector armsFit on front of plate and may be set to any portion of a complete turn
- 13Angular Indexingno. of degrees required
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- L2 General Machinist Flashcards on Indexing, created by mininoey on 16/10/2015.
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- mininoey
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