TPC 327 Flashcards
You will probably use the dividing head most often to machine?
Shapes, like gear teeth
What machining method relies on the index holes around the spindle?
Direct indexing
With a gear ratio of 40:1 how many times must you turn the worm gear and spindle to complete one 360 degree rotation?
40 turns
Indexing fractions of a turn formula
T= 40/N
In simple angular indexing one crank turn produces?
360/40 or 9 degrees
For simple angular indexing use any circle in the index plate with a total number of holes that can be divided by?
Nine, for example 27,36,45, or 54
one turn of the crank moves the spindle how many degrees?
9 degrees
In compound indexing, you first turn the crank, as in simple indexing. Next….
You turn the index plate itself to provide the final index
Differential indexing is similar to, but more accurate than?
Compound indexing
How does a universal dividing head differ from a plain dividing head?
The spindle nose can be rotated 90 degrees from parallel with the tabletop to a perpendicular position
Workpieces can be held between the center in the spindle nose and the center in the?
Foot stock
The power flow moves from the dividing head spindle to the driver, from the driver to the dog, and then from the dog to the…?
Workpiece
How do you support a workpiece in a dividing head chuck?
With the footstock center or a steady rest
If you straddle mill a hexagonal bolt head how many cuts are needed?
Only three
How to prevent chips from falling into the spindle while the nose is pointing upward?
By inserting a specifically made cap over the spindle opening
What indexing method does not count for the hole it was in ( the zero hole )
Direct indexing method
How do you use the plain indexing method?
By leaving the worm and worm gear in the engaged position
Make your rough and finish cuts to mill the first side of the hexagon. Retract the pin and turn the crank clockwise six full revolutions and then continue until the pin reaches?
The hole indicated by the second sector arm. This is for plain indexing
Straddle milling a hexagon
You will mill two sides at a time and need only position the workpiece 3 times
When will you find the dividing head useful?
Whenever you must drill or bore a series of holes in a circle