Canned Cycles 150401c Flashcards
What is the advantage of hole Machining canned cycles?
Simplifies programming.
How do hole machining canned Cycles dramatically simplify the programming?
One command is required per hole also canned Cycles are modal you just simply list coordinates for hole locations
What is a Canned Cycle?
A series of predetermined movements a CNC machine executes based on a limited amount of program info.
List the four basic activities of a hole machining canned cycle
Rapids to hold location in XY
Rapid to the R plane
Machines the hole
Retracts from hole
How do you adjust a chip breaking retract movement in a g73 cycle?
Adjustable by a machine parameter. Q word
G83 deep hole drilling cycle is recommended for drilling holes at what depth?
Three to four times the drill diameter
What type of Tap Holder is required on older machines?
Tension compression tap holder
What is rigid tapping and why is it advantageous?
Allows for perfect synchronization between the spindle reversal at the hole bottom position with Z axis motion
Calculate the feed rate g94 to rigid tap a 1/4 20 UNC thread using a spindle speed of 450 RPM
Pitch equals 1/20 equals .05
.05 * 450 equals 22.5 feed rate
What is the recommended approach distance when using a tension compression tap holder?
.250
Rigid tapping is still .100 approach distance
What features are disabled during a tapping cycle?
Feed rate override, feed hold, single block
How is tapping compound applied before the tapping cycle begins?
M00. Clear chips and add tapping compound during this programmed stop
What is the P letter used for in a g82 canned cycle?
Pause time. Done to relieve tool pressure, make the hole bottom flat and precise
How are G82 and G89 different?
G82 uses counterbore or End Mill
G89 blind holes to precise depths, leaves a witness mark
How are g86 and g76 different?
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
When is the boring bars orientation important?
For finishing with no witness marks
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?
I value and + .001”
What object on the tool holder allows you to maintain the boring bar tip in a predictable Direction?
It’s dimpled. There’s a different width (depth) for the key ways
What is the difference between a g85 reaming cycle and a g81 drilling cycle?
G81 Rapids out of the hole, g85 attracts at same feed rate as it enters into.
Explain the difference between the initial plane and the R plane.
The initial plan is the last Z position prior to the Canned Cycle command
The R plane is specified in the Canned cycle
Explain the difference between G 98 and G 99
G98 is a retract motion to the initial plane
G99 is a retract motion to the R plane
Which plane, initial or R, is activated when the machine Powers up?
G98, retract to initial plane
When drilling multiple holes on a grid pattern, would it be best to use absolute or incremental?
Incremental
What letter command is used to specify the number of evenly spaced holes?
L Word
What G code is used to specify a counter boring cycle?
G82
What G code is used to specify a standard drilling cycle?
G81
Name two things all hole machine and canned cycle share in common?
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.
Define the two planes, R and initial plane, that you use to avoid obstructions when using hole Machining canned Cycles
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
