Canned Cycles 150401c

Question 1

What is the advantage of hole Machining canned cycles?

Answer 1

Simplifies programming.

Question 2

How do hole machining canned Cycles dramatically simplify the programming?

Answer 2

One command is required per hole also canned Cycles are modal you just simply list coordinates for hole locations

Question 3

What is a Canned Cycle?

Answer 3

A series of predetermined movements a CNC machine executes based on a limited amount of program info.

Question 4

List the four basic activities of a hole machining canned cycle

Answer 4

Rapids to hold location in XY
Rapid to the R plane
Machines the hole
Retracts from hole

Question 5

How do you adjust a chip breaking retract movement in a g73 cycle?

Answer 5

Adjustable by a machine parameter. Q word

Question 6

G83 deep hole drilling cycle is recommended for drilling holes at what depth?

Answer 6

Three to four times the drill diameter

Question 7

What type of Tap Holder is required on older machines?

Answer 7

Tension compression tap holder

Question 8

What is rigid tapping and why is it advantageous?

Answer 8

Allows for perfect synchronization between the spindle reversal at the hole bottom position with Z axis motion

Question 9

Calculate the feed rate g94 to rigid tap a 1/4 20 UNC thread using a spindle speed of 450 RPM

Answer 9

Pitch equals 1/20 equals .05

.05 * 450 equals 22.5 feed rate

Question 10

What is the recommended approach distance when using a tension compression tap holder?

Answer 10

.250

Rigid tapping is still .100 approach distance

Question 11

What features are disabled during a tapping cycle?

Answer 11

Feed rate override, feed hold, single block

Question 12

How is tapping compound applied before the tapping cycle begins?

Answer 12

M00. Clear chips and add tapping compound during this programmed stop

Question 13

What is the P letter used for in a g82 canned cycle?

Answer 13

Pause time. Done to relieve tool pressure, make the hole bottom flat and precise

Question 14

How are G82 and G89 different?

Answer 14

G82 uses counterbore or End Mill

G89 blind holes to precise depths, leaves a witness mark

Question 15

How are g86 and g76 different?

Answer 15

86 is a standard boring cycle that leaves witness marks for rough or semi finishing
76 is he fine boring cycle and leaves no witness mark for finishing

Question 16

When is the boring bars orientation important?

Answer 16

For finishing with no witness marks

Question 17

If you were using the G76 fine boring cycle and you know the boring bar tip is pointing in the X negative direction when the spindle is at its Orient position, which word and what polarity will cause the boring bar to move away from the finished for?

Answer 17

I value and + .001”

Question 18

What object on the tool holder allows you to maintain the boring bar tip in a predictable Direction?

Answer 18

It’s dimpled. There’s a different width (depth) for the key ways

Question 19

What is the difference between a g85 reaming cycle and a g81 drilling cycle?

Answer 19

G81 Rapids out of the hole, g85 attracts at same feed rate as it enters into.

Question 20

Explain the difference between the initial plane and the R plane.

Answer 20

The initial plan is the last Z position prior to the Canned Cycle command
The R plane is specified in the Canned cycle

Question 21

Explain the difference between G 98 and G 99

Answer 21

G98 is a retract motion to the initial plane

G99 is a retract motion to the R plane

Question 22

Which plane, initial or R, is activated when the machine Powers up?

Answer 22

G98, retract to initial plane

Question 23

When drilling multiple holes on a grid pattern, would it be best to use absolute or incremental?

Answer 23

Incremental

Question 24

What letter command is used to specify the number of evenly spaced holes?

Answer 24

L Word

Question 25

What G code is used to specify a counter boring cycle?

Answer 25

G82

Question 26

What G code is used to specify a standard drilling cycle?

Answer 26

G81

Question 27

Name two things all hole machine and canned cycle share in common?

Answer 27

They are modal
They cause for predetermined activities, rapid to the whole in XY, rapid to the R plane, machine the hole and retract from the hole.

Question 28

Define the two planes, R and initial plane, that you use to avoid obstructions when using hole Machining canned Cycles

Answer 28

Our plane, Z surface specified by the r word in the can cycle command. This position is usually right above the work surface.

Initial plane, the last programmed Z position prior to the Canned cycle command