Automatically programmed tool (ATP)

Nov 24, 2017Download as pptx, pdf9 likes7,099 views

APT stands for Automatically Programmed Tool. It is a language that defines the tool path with respect to the part geometry, and often forms the basis for post-processor generated NC files.

 It is a language that defines the tool path with
respect to the part geometry.
Or
 It is a program which consists of
instructions/statements which are used to
specify the path of the tool to follow for
producing a given part.
 Developed by MIT in 1959

 Geometry statements
 Motion statements
 Postprocessor statements (feed, speed,
coolant, …etc)
 Auxiliary statements(tool, tolerance, part, …
etc)

 It defines a geometric shape/form.
 There are 16 different geometric forms
e.g.-POINT, LINE, PLANE, CIRCLE, CYLNDR,
ELLIPS,HYPERB, CONE, PATERN,….etc
 The general form of geometry statements is:
symbol = geometry type / descriptive data

 Used to define the tool movement in a
specific direction.
 In APT there are two basic types of motion
statements:
1. Point to Point motion (PTP)
2. Contouring motion

 Used to position the tool at desired position.
 There are only two basic point to point
motion commands
1. GOTO/
2. GODLTA/

GOTO:
The GOTO statement instructs the tool to go to a
particular point location specified in the descriptive
data.
e.g. GOTO / P2
GOTO / 2, 7, 0
GODLTA:
The GODLTA command specifies an incremental move
for the tool.
e.g. GODLTA / 2, 7, 0
instructs the tool to move from its present position to
2 units in x-direction, 7 units in y-direction and 0 units
in z-direction.

 In contouring motion commands the tool
position must be continuously controlled
throughout the move. For contouring
movements, the tool is directed along
intersecting surfaces.These surfaces have
specific names in APT.
i.e. Drive Surface (DS)
Part Surface (PS)
Check Surface (CS)

Drive Surface (DS): The surface against which the edge of tool
rides.
Part Surface (PS) : The surface on which the bottom end of the
tool rides.
Check Surface (CS) : The surface at which the tool motion is
stop.

HOWTO APPROACHTHE CHECKSURFACE
Modifier words, such asTO, ON, PAST orTANTO, are
used to govern the position of the tool in relation to
the check surface.

INITIAL CONTOURING MOTION
STATEMENT
GO/TO
which defines the initial drive, part and check surfaces.
It takes the form:
GO/TO, drive surface,TO, part surface,TO, check surface
An example would be:
GO/TO, L1,TO, PL1,TO, L2
specifying that the tool should use
line L1 as the drive surface,
plane P1 as the part surface, and
line L2 as the check surface.

MOTION COMMANDS
GOLFT/ : Move left along the drive surface
GORGT/ : Move right along the drive surface
GOUP/ : Move up along the drive surface
GODOWN/ : Move down along the drive surface
GOFWD/ : Move forward from a tangent position
GOBACK/ : Move backward from a tangent position

 MACHIN/ : use to specify the machine tool
e.g.- MACHIN/DRILL,3
 COOLNT/ : coolant fluid to be turned on or off.
e.g.- COOLNT /ON
 FEDRAT/: feed rate for the tool in inch per min.
e.g.- FEDRAT/4.5
 SPINDL/: spindle rotation speed in rev per min.
e.g.- SPINDL/ 850

 These statements complete the APT
programming language
 CUTTER/: specifies a quarter-inch cutter dia.
e.g.- CUTTER/.25
 FINI: end of program
 Tool tolerances.
e.g.-INTOL/.0015
e.g.-OUTTOL/.001

(a)feed rate is 5.39 inches per minute;
(b)spindle speed is 573 rev per minute;
(c)coolant is to be used to flush the chips;
(d)the cutter dia is to be 0.5 inches,
(e)the tool home position is (0, -1, 0).

PARTNO
MACHIN/MILL ,1
CUTTER/0.5000
P0 = POINT/0, -1.0, 0
P1 = POINT/0, 0, 0
P2 = POINT/6.0, 0, 0
P3 = POINT/6.0, 1.0, 0
P4 = POINT/2.0, 4.0, 0
L1 = LINE/P1, P2
C1 = CIRCLE/CENTER, P3,
RADIUS, 1.0
L2 = LINE/P4, LEFT, TANTO, C1
L3 = LINE/P1, P4
PL1 = PLANE/P1, P2, P3
SPINDL/573
FEDRAT/5.39
COOLNT/ON
FROM/P0
GO/PAST, L3, TO, PL1, TO, L1
GOUP/L3, PAST, L2
GORGT/L2, TANTO, C1
GOFWD/C1, ON, P2
GOFWD/L1, PAST, L3
RAPID
GOTO/P0
COOLNT/OFF
FINI
PROGRAM

This document contains information about computer-assisted part programming using APT (Automatically Programmed Tool) language. It discusses the tasks divided between the human programmer and computer, including input translation, arithmetic computations, editing, and post processing. It also describes defining part geometry, specifying tool paths and operations, and includes examples of part programs for drilling and milling operations.

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Automatically programmed tool (ATP)

1. By MANOJ K 1MS16MCM09 MSRIT

2.  It is a language that defines the tool path with respect to the part geometry. Or  It is a program which consists of instructions/statements which are used to specify the path of the tool to follow for producing a given part.  Developed by MIT in 1959

3.  Geometry statements  Motion statements  Postprocessor statements (feed, speed, coolant, …etc)  Auxiliary statements(tool, tolerance, part, … etc)

4.  It defines a geometric shape/form.  There are 16 different geometric forms e.g.-POINT, LINE, PLANE, CIRCLE, CYLNDR, ELLIPS,HYPERB, CONE, PATERN,….etc  The general form of geometry statements is: symbol = geometry type / descriptive data

19. or or

29.  Used to define the tool movement in a specific direction.  In APT there are two basic types of motion statements: 1. Point to Point motion (PTP) 2. Contouring motion

30.  Used to position the tool at desired position.  There are only two basic point to point motion commands 1. GOTO/ 2. GODLTA/

31. GOTO: The GOTO statement instructs the tool to go to a particular point location specified in the descriptive data. e.g. GOTO / P2 GOTO / 2, 7, 0 GODLTA: The GODLTA command specifies an incremental move for the tool. e.g. GODLTA / 2, 7, 0 instructs the tool to move from its present position to 2 units in x-direction, 7 units in y-direction and 0 units in z-direction.

32.  In contouring motion commands the tool position must be continuously controlled throughout the move. For contouring movements, the tool is directed along intersecting surfaces.These surfaces have specific names in APT. i.e. Drive Surface (DS) Part Surface (PS) Check Surface (CS)

33. Drive Surface (DS): The surface against which the edge of tool rides. Part Surface (PS) : The surface on which the bottom end of the tool rides. Check Surface (CS) : The surface at which the tool motion is stop.

34. HOWTO APPROACHTHE CHECKSURFACE Modifier words, such asTO, ON, PAST orTANTO, are used to govern the position of the tool in relation to the check surface.

35. INITIAL CONTOURING MOTION STATEMENT GO/TO which defines the initial drive, part and check surfaces. It takes the form: GO/TO, drive surface,TO, part surface,TO, check surface An example would be: GO/TO, L1,TO, PL1,TO, L2 specifying that the tool should use line L1 as the drive surface, plane P1 as the part surface, and line L2 as the check surface.

36. MOTION COMMANDS GOLFT/ : Move left along the drive surface GORGT/ : Move right along the drive surface GOUP/ : Move up along the drive surface GODOWN/ : Move down along the drive surface GOFWD/ : Move forward from a tangent position GOBACK/ : Move backward from a tangent position

37.  MACHIN/ : use to specify the machine tool e.g.- MACHIN/DRILL,3  COOLNT/ : coolant fluid to be turned on or off. e.g.- COOLNT /ON  FEDRAT/: feed rate for the tool in inch per min. e.g.- FEDRAT/4.5  SPINDL/: spindle rotation speed in rev per min. e.g.- SPINDL/ 850

38.  These statements complete the APT programming language  CUTTER/: specifies a quarter-inch cutter dia. e.g.- CUTTER/.25  FINI: end of program  Tool tolerances. e.g.-INTOL/.0015 e.g.-OUTTOL/.001

39. (a)feed rate is 5.39 inches per minute; (b)spindle speed is 573 rev per minute; (c)coolant is to be used to flush the chips; (d)the cutter dia is to be 0.5 inches, (e)the tool home position is (0, -1, 0).

41. PARTNO MACHIN/MILL ,1 CUTTER/0.5000 P0 = POINT/0, -1.0, 0 P1 = POINT/0, 0, 0 P2 = POINT/6.0, 0, 0 P3 = POINT/6.0, 1.0, 0 P4 = POINT/2.0, 4.0, 0 L1 = LINE/P1, P2 C1 = CIRCLE/CENTER, P3, RADIUS, 1.0 L2 = LINE/P4, LEFT, TANTO, C1 L3 = LINE/P1, P4 PL1 = PLANE/P1, P2, P3 SPINDL/573 FEDRAT/5.39 COOLNT/ON FROM/P0 GO/PAST, L3, TO, PL1, TO, L1 GOUP/L3, PAST, L2 GORGT/L2, TANTO, C1 GOFWD/C1, ON, P2 GOFWD/L1, PAST, L3 RAPID GOTO/P0 COOLNT/OFF FINI PROGRAM

42. THANK YOU

Automatically programmed tool (ATP)

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