move_arc_rel_tool¶

Queued EXEC mode Enabled Homed Takes control

Move the tool along a circular arc given by offsets along its own axes. Like move_arc(), with via and end given as offsets along the tool's axes as they are when the move starts.

Syntax¶

robot.move_arc_rel_tool(via, end, timeout=120.0, *, angle_unit='rad', **options)

Arguments¶

Name	Type	Default	Description
`via`	`Sequence[float]`	required	The offset `[dx, dy, dz, drx, dry, drz]` the arc passes through: metres, and radians or degrees as `angle_unit` says.
`end`	`Sequence[float]`	required	The offset the arc ends at, in the same form.
`timeout`	`float`	`120.0`	Seconds to wait for the move to finish, in sync mode only.
`angle_unit`	`str`	`'rad'`	`"rad"` or `"deg"`: the unit of every angle in this call.
`**options`	`Any`	each setting's own	Settings for this move only. Each one you leave out takes its default: `speed` = 100 % `accel` = 100 % `duration` = none (the speed decides) `profile` = "ruckig" `jerk` = 100 % `ramp_fraction` = 0.25 `blend` = 0 `blend_mode` = "exact_velocity" `blend_continuity` = "c1" `ik_solver` = "pinocchio" `singularity_strategy` = "stop" `samples` = automatic `dry_run` = False

Returns¶

str

The command id. The call returns once the robot has accepted the move; call wait_idle() to wait until it has finished. In sync mode the call returns when the move has finished.

Examples¶

robot.move_arc_rel_tool([0.03, 0.03, 0, 0, 0, 0], [0.06, 0, 0, 0, 0, 0])
robot.wait_idle()

Further details¶

Note

Blending does not apply: blend must be 0, and the move starts and ends at rest. A curve that would exceed an acceleration limit is slowed down, to 25 % of speed at most, before it fails; with duration set it is not slowed.

Usage restrictions 29 codes

This command is added to the robot's motion queue. The robot accepts it only when it is ready for motion (EXEC mode, enabled and homed), from the client that holds control or when no client does. Otherwise, the robot refuses it with one of:

[6022] Client too old for pose commands — only a raw client that sends no "protocol": 2
[6010] Command not allowed now — the message names the mode or state it needs
[6101] Control held by another client — another client holds control; the message names it
[5002] Program aborted — an earlier move failed; clear errors first
[6004] Invalid motion options — a setting is unknown, out of range, or refused for a single move
[6011] Motion queue full

Once accepted, the move can still fail before it starts:

[5108] Blending not supported on curves — blend is above 0; curves do not blend yet
[5110] Invalid curve arguments — a raw client sent the wrong number of values
[5109] Invalid curve — the start, via and end do not define an arc: they lie on one line, or via or end is the start
[5101] Target out of reach — the arm cannot reach the target pose
[5102] Path only partly reachable — the arm cannot reach a pose on the way to the target
[5103] Path too close to a limit — a pose on the path needs a joint outside its limits
[5105] Configuration flip on the path — the arm would have to change its configuration on the way, for example flip its wrist
[5104] Solution misses the pose — the joint solution misses a pose on the path
[5107] Tool strays from the path — the tool would stray from the curve, usually near a singularity
[5010] Requested duration too short — duration is shorter than the limits allow
[5011] Invalid duration — duration is not more than 0 seconds
[5201] TOPPRA profile unavailable — profile="toppra", but that planner is missing
[5202] TOPPRA found no solution — profile="toppra" found no timing within the limits
[5009] Planned acceleration over its limit — the planned motion would exceed an acceleration limit
[5006] Move outside the joint limits — the path would take a joint outside its limits
[5007] Move into a safety zone — the path would enter a safety zone
[5008] Zone check unavailable — safety zones are active, but the robot model to check them is missing
[1401] Self-collision — the path would bring two parts of the arm too close
[5001] Trajectory planning failed
[3201] Trajectory not taken by RTI

A move that has started can end early with:

[5003] Command cancelled — an earlier move failed, or the robot left EXEC mode
[5004] Command stopped — stop() was called
[5005] Move did not settle — only with set_completion_policy("strict")

In Python, a refusal raises CommandRejected; its number is the code above. A failure after the robot accepted the move is raised by wait_idle() as MotionFailed, or by this call itself in sync mode as CommandRejected. No answer raises RobotTimeout; no connection, RobotConnectionError. ValueError: via or end does not have 6 values, or angle_unit is neither "rad" nor "deg".

Protocol¶

A client that does not use robotclient sends this over the TCP command protocol (port 29000) for the example above:

{"id": "c1", "cmd": "move_arc_rel_tool", "args": [0.03, 0.03, 0.0, 0.0, 0.0, 0.0, 0.06, 0.0, 0.0, 0.0, 0.0, 0.0], "protocol": 2}