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30 Which formula is used to find the gear ratio for differential indexing. Ii Now equating eq i and eq iiwe get G x 167x 140 166 167 G 4066 67 66 40 N available N required N available This is the generalized formula calculating the gear ratio of change gears in differential indexing mechanism.
Holes in the 33-hole circle.
Differential indexing formula in milling machine. The denominator of the resulting fraction. Derived in step 2 is the term used to find the number of. Turns and holes to index the spindle and index plate.
To index for 99 divisions turn the spindle by an. Amount equal to 6033 or one complete turn plus 27. Holes in the 33-hole circle.
Turn the index plate by an. The total motion or movement of the crank in indexing is equal to its total movement in relation to the index platethat is the sum of its positive motion and its negative motion. In simple differential indexing Figure 14-6 the gear on the worm shaft is the driver and the gear on the spindle is the driven gear.
Set the dividing head to mill 30 teeth on spur wheel blank by simple indexing. Index Crank movement 40N 4030 43 43 77 1721. If it is desired to index a job by 35 degree then the index head movement required to perform the operation will be 359 389 3 8 X 3 9 X 3 3 2427 ie the crank must be turned three complete revolutions plus 24 holes in the.
Most Navy machine shops have the knee and column type of milling machine. This machine has a fixed spindle and a vertically adjustable table. We will discuss the knee and column type of milling machine in this chapter but keep in mind that most of the information we give you also applies to other types of milling machines such as a horizontal boring mill which is a typical bed-type milling machine.
Simple Indexing Calculating the indexing or number of turns of crank for most simply divide 40 by number of divisions or flats to be cut. 19 Turns of the crank 40 No of flats needed. 34 Angular Indexing Calculate indexing for 24 Divide 24540 490 490 1225 1 hole on a 225 hole circle The nearest is a 23 hole circle.
Indexing would be 1 hole on a 23 hole circle with a slight error approximately 12 minute. A need for higher accuracy requires differential indexing. Ii Now equating eq i and eq iiwe get G x 167x 140 166 167 G 4066 67 66 40 N available N required N available This is the generalized formula calculating the gear ratio of change gears in differential indexing mechanism.
Using this formula if the gear ratio has a negative sign then the indexing plate needs to be rotated in the opposite direction of the crank handle and if it has a. Milling Equations Machining Time. Peripheral Milling T m L A f r T m Machining Time Min L Length of Cut A Approach Distance f r Feed Rate Dist Min Machining Time.
Face Milling T m f r L A O T m Machining Time Min L Length of Cut A Approach Distance O Cutter Run Out Distance f r Feed Rate Dist Min 4. Summary The approximation of linear systemsy-Atybt by backward differentiation methods up to order 5 is considered. To determine the number of turns and parts of a turn of the index.
Crank for a desired number of degrees divide the number of degrees by 9. The quotient will represent the number of complete turns and fractions of a. Turn that you should rotate the index crank.
For example the calculation. Indexing is done on the milling machine using a dividing head. The dividing head is a very important tool used to divide the circumference of a work piece into equally spaced divisions.
This is important when milling gears splines hexagons and so on. Assume H 33 n 22. X 33 40 59 22 33 22 33 2 3 displaystyle x frac left 33times 40right-left 59times 22right 33 tfrac 22 33 tfrac 2 3.
We now select gears giving this ratio as 32 and 48 the 32 being the. Indexing for Divisions One hole on 100-hole circle of small index plate C 1100 x 14000 1400000 of a turn Formula for indexing divisions 400000N 47 48. An indexing head also known as a dividing head or spiral head is a specialized tool that allows a workpiece to be circularly indexed.
That is easily and precisely rotated to preset angles or circular divisions. Indexing heads are usually used on the tables of milling machines but may be used on many other machine tools including drill presses grinders and boring machines. Common jobs for a dividing head include machining the flutes of a milling.
Differential Indexing 15 Grand Plastic Surgery The leading plastic surgery clinic in Korea with 4 specialized centers HOME LATHE MACHINE MILLING MACHINE SHAPER MACHINE PLANER MACHINE SLOTTER MACHINE HYDRAULIC MACHINES BOILERS WOOD WORKING MACHINES WORK HOLDING DEVICES WOOD WORKING TOOLS GAUGES MEASURING TOOLS DRILLING MACHINES. Determine the number of minutes represented by one. The required amount for the number of divisions.
Turn of the index crank multiply the number of. Compound indexing is seldom used because 1 degrees covered in one turn of the index crank by 60. Differential indexing is easier 2 high-number index.
Which formula is used to find the gear ratio for differential indexing. 30 Which formula is used to find the gear ratio for differential indexing. A N x 40 x A B A-N x 40A C 2A x 40A.