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Source: Roblox Creator Hub · CC BY 4.0 · View source · Code samples: MIT Imported 2026-10-03. Formatting adapted for this site.

SlidingBallConstraint

Inherits from: Constraint → Instance → Object

SlidingBallConstraint is the base class for constraints that allow their attachments to slide along an axis, including PrismaticConstraint and CylindricalConstraint. The base class does not restrict rotation. PrismaticConstraint prevents rotation, while CylindricalConstraint allows rotation about an axis.

When configuring this constraint, it may be helpful to study Roblox Units to understand how Roblox units compare to metric units.

Linear Power

If this constraint's ActuatorType is set to Motor, it attempts to translate the attachments with the goal of reaching Velocity. You can further control this translation through both MotorMaxAcceleration and MotorMaxForce.

If this constraint's ActuatorType is set to Servo, it attempts to translate the attachments to a set separation specified by TargetPosition. This translation is controlled by Speed, LinearResponsiveness, and ServoMaxForce.

Limits

You can set limits to restrict this constraint's sliding range. Enabling the LimitsEnabled property exposes the LowerLimit and UpperLimit values, as well as Restitution which defines the elasticity of the attachments when they reach either limit.

Inherits from: Constraint

Descendants: CylindricalConstraint, PrismaticConstraint

Memory category: BaseParts

Tags: NotCreatable

Properties

Name	Type / Returns	Description
SlidingBallConstraint.ActuatorType	ActuatorType	Sets whether the translation of the `SlidingBallConstraint` is actuated and, if so, what kind of actuation.
SlidingBallConstraint.CurrentPosition	float	The current offset between the constraint's `Attachments`.
SlidingBallConstraint.LimitsEnabled	boolean	Sets whether the `SlidingBallConstraint` will limit the range of translation.
SlidingBallConstraint.LinearResponsiveness	float	Specifies the "sharpness" of the linear servo motor in reaching the `TargetPosition`.
SlidingBallConstraint.LowerLimit	float	The lower positional limit along the X axis of `Attachment0` if `LimitsEnabled` is true.
SlidingBallConstraint.MotorMaxAcceleration	float	The constraint's maximum acceleration when `ActuatorType` is set to `Motor` as the constraint attempts to reach its desired `Velocity`.
SlidingBallConstraint.MotorMaxForce	float	The constraint's maximum force when `ActuatorType` is set to `Motor`, as the constraint attempts to reach its desired `Velocity`.
SlidingBallConstraint.Restitution	float	The elasticity of the constraint's `Attachments` when they reach the end of the range specified by `UpperLimit` and `LowerLimit`, assuming `LimitsEnabled` is set to true.
SlidingBallConstraint.ServoMaxForce	float	The constraint's maximum force when `ActuatorType` is set to `Servo`, as the constraint attempts to reach its desired `Speed`.
SlidingBallConstraint.Size	float	The constraint's visualized size.
SlidingBallConstraint.SoftlockServoUponReachingTarget	boolean
SlidingBallConstraint.Speed	float	The constraint's desired speed when `ActuatorType` is set to `Servo`, as the constraint translates towards its `TargetPosition`. Measured in studs per second.
SlidingBallConstraint.TargetPosition	float	The constraint's attempted target position when `ActuatorType` is set to `Servo`. Measured in studs.
SlidingBallConstraint.UpperLimit	float	The upper positional limit along the X axis of `Attachment0` if `LimitsEnabled` is true.
SlidingBallConstraint.Velocity	float	The constraint's attempted velocity when `ActuatorType` is set to `Motor`. Measured in studs per second.

Inherited from Constraint

Name	Type / Returns	Description
Constraint.Active	boolean	Indicates if the constraint is currently active in the world.
Constraint.Attachment0	Attachment	The `Attachment` that is connected to `Constraint.Attachment1`.
Constraint.Attachment1	Attachment	The `Attachment` that is connected to `Constraint.Attachment0`.
Constraint.Color	BrickColor	The color of the constraint.
Constraint.Enabled	boolean	Toggles whether or not the constraint is enabled.
Constraint.Visible	boolean	Toggles the constraint's visibility.

Inherited from Instance

Name	Type / Returns	Description
Instance.Archivable	boolean	Determines if an `Instance` and its descendants can be cloned using `Instance:Clone()`, and can be saved/published.
Instance.archivable	boolean
Instance.Capabilities	SecurityCapabilities	The set of capabilities allowed to be used for scripts inside this container.
Instance.IsInSandbox	boolean	Indicates whether the instance is inside a sandboxed container.
Instance.Name	string	A non-unique identifier of the `Instance`.
Instance.Parent	Instance	Determines the hierarchical parent of the `Instance`.
Instance.PredictionMode	PredictionMode	Reflects the client-side prediction mode applied to the instance under server-authoritative physics.
Instance.RobloxLocked	boolean	A deprecated property that used to protect `CoreGui` objects.
Instance.Sandboxed	boolean	When enabled, the instance can only access abilities in its `Capabilities` list.
Instance.UniqueId	UniqueId	A unique identifier for the instance.

Inherited from Object

Name	Type / Returns	Description
Object.ClassName	string	A read-only string representing the class this `Object` belongs to.
Object.className	string

SlidingBallConstraint.ActuatorType

Sets whether the translation of the SlidingBallConstraint is actuated and, if so, what kind of actuation.

If ActuatorType is set to None, the joint can slide freely.
If ActuatorType is set to Motor, it attempts to translate the attachments with the goal of reaching Velocity. You can further control this translation through both MotorMaxAcceleration and MotorMaxForce.
If this constraint's ActuatorType is set to Servo, it attempts to translate the attachments to a set separation specified by TargetPosition. This translation is controlled by Speed, LinearResponsiveness, and ServoMaxForce.

Field	Value
type	ActuatorType
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Slider
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

SlidingBallConstraint.CurrentPosition

The current offset between the constraint's Attachments.

Field	Value
type	float
tags	["ReadOnly","NotReplicated"]
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Derived
serialization	{"can_load":false,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

SlidingBallConstraint.LimitsEnabled

Sets whether the SlidingBallConstraint will limit the range of translation. If true, this property exposes the LowerLimit and UpperLimit values, as well as Restitution which defines the elasticity of the attachments when they reach either limit.

Field	Value
type	boolean
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Slider
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

SlidingBallConstraint.LinearResponsiveness

Specifies the "sharpness" of the linear servo motor in reaching the TargetPosition when the derived classes' actuator type is set to Servo. Larger values correspond to faster a response and smaller values results in more damping and a slower response.

Field	Value
type	float
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Servo
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

SlidingBallConstraint.LowerLimit

The lower positional limit along the X axis of Attachment0 if LimitsEnabled is true.

Field	Value
type	float
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Limits
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

SlidingBallConstraint.MotorMaxAcceleration

The constraint's maximum acceleration when ActuatorType is set to Motor, as the constraint attempts to reach its desired Velocity.

Field	Value
type	float
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Motor
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

SlidingBallConstraint.MotorMaxForce

The constraint's maximum force when ActuatorType is set to Motor, as the constraint attempts to reach its desired Velocity.

Field	Value
type	float
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Motor
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

SlidingBallConstraint.Restitution

The elasticity of the constraint's Attachments when they reach the end of the range specified by UpperLimit and LowerLimit, assuming LimitsEnabled is set to true. The valid range is between 0–1.

Field	Value
type	float
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Limits
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

SlidingBallConstraint.ServoMaxForce

The constraint's maximum force when ActuatorType is set to Servo, as the constraint attempts to reach its desired Speed.

Field	Value
type	float
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Servo
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

SlidingBallConstraint.Size

The constraint's visualized size.

Field	Value
type	float
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Appearance
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

SlidingBallConstraint.SoftlockServoUponReachingTarget

Deprecated. This property should not be used in new work.

Field	Value
type	boolean
tags	["Deprecated"]
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Servo
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

SlidingBallConstraint.Speed

The constraint's desired speed when ActuatorType is set to Servo, as the constraint translates towards its TargetPosition. Measured in studs per second.

Field	Value
type	float
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Servo
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

SlidingBallConstraint.TargetPosition

The constraint's attempted target position when ActuatorType is set to Servo Measured in studs.

Field	Value
type	float
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Servo
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

SlidingBallConstraint.UpperLimit

The upper positional limit along the X axis of Attachment0 if LimitsEnabled is true.

Field	Value
type	float
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Limits
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

SlidingBallConstraint.Velocity

The constraint's attempted velocity when ActuatorType is set to Motor. Measured in studs per second.

Field	Value
type	float
security	{"read":"None","write":"None"}
thread safety	ReadSafe
category	Motor
serialization	{"can_load":true,"can_save":true}
capabilities	["Physics"]
simulationAccess	true

Methods

Inherited from Constraint

Name	Type / Returns	Description
Constraint:GetDebugAppliedForce	Vector3
Constraint:GetDebugAppliedTorque	Vector3

Inherited from Instance

Name	Type / Returns	Description
Instance:AddTag	()	Applies a tag to the instance.
Instance:children	Instances	Returns an array of the object's children.
Instance:ClearAllChildren	()	This method destroys all of an instance's children.
Instance:Clone	Instance	Create a copy of an instance and all its descendants, ignoring instances that are not `Archivable`.
Instance:clone	Instance
Instance:Destroy	()	Sets the `Instance.Parent` property to `nil`, locks the `Instance.Parent` property, disconnects all connections, and calls `Destroy()` on all children.
Instance:destroy	()
Instance:FindFirstAncestor	Instance?	Returns the first ancestor of the `Instance` whose `Instance.Name` is equal to the given name.
Instance:FindFirstAncestorOfClass	Instance?	Returns the first ancestor of the `Instance` whose `Object.ClassName` is equal to the given className.
Instance:FindFirstAncestorWhichIsA	Instance?	Returns the first ancestor of the `Instance` for whom `Object:IsA()` returns true for the given className.
Instance:FindFirstChild	Instance?	Returns the first child of the `Instance` found with the given name.
Instance:findFirstChild	Instance
Instance:FindFirstChildOfClass	Instance?	Returns the first child of the `Instance` whose `ClassName` is equal to the given class name.
Instance:FindFirstChildWhichIsA	Instance?	Returns the first child of the `Instance` for whom `Object:IsA()` returns true for the given className.
Instance:FindFirstDescendant	Instance?	Returns the first descendant found with the given `Instance.Name`.
Instance:GetActor	Actor?	Returns the `Actor` associated with the Instance, if any.
Instance:GetAttribute	Variant	Returns the value which has been assigned to the given attribute name.
Instance:GetAttributeChangedSignal	RBXScriptSignal	Returns an event that fires when the given attribute changes.
Instance:GetAttributes	Dictionary	Returns a dictionary of the instance's attributes.
Instance:GetChildren	Instances	Returns an array containing all of the instance's children.
Instance:getChildren	Instances
Instance:GetDebugId	string	Returns a coded string of the debug ID used internally by Roblox.
Instance:GetDescendants	Instances	Returns an array containing all of the descendants of the instance.
Instance:GetFullName	string	Returns a string describing the instance's ancestry.
Instance:GetStyled	Variant	Returns the styled or explicitly modified value of the specified property, or else the default property value if it hasn't been styled/modified.
Instance:GetStyledPropertyChangedSignal	RBXScriptSignal	Returns an event that fires when the given style property changes on the instance.
Instance:GetTags	Array	Gets an array of all tags applied to the instance.
Instance:HasTag	boolean	Check whether the instance has a given tag.
Instance:IsAncestorOf	boolean	Returns true if an `Instance` is an ancestor of the given descendant.
Instance:IsDescendantOf	boolean	Returns `true` if an `Instance` is a descendant of the given ancestor.
Instance:isDescendantOf	boolean
Instance:IsPropertyModified	boolean	Returns `true` if the value stored in the specified property is not equal to the code-instantiated default.
Instance:QueryDescendants	Instances	Returns an array containing all descendants of the instance that match the `selector` string.
Instance:Remove	()	Sets the object's `Parent` to `nil`, and does the same for all its descendants.
Instance:remove	()
Instance:RemoveTag	()	Removes a tag from the instance.
Instance:ResetPropertyToDefault	()	Resets a property to its default value.
Instance:SetAttribute	()	Sets the attribute with the given name to the given value.
Instance:WaitForChild	Instance	Returns the child of the `Instance` with the given name. If the child does not exist, it will yield the current thread until it does.

Inherited from Object

Name	Type / Returns	Description
Object:GetPropertyChangedSignal	RBXScriptSignal	Get an event that fires when a given property of the object changes.
Object:IsA	boolean	Returns true if an object's class matches or inherits from a given class.
Object:isA	boolean

Events

Inherited from Instance

Name	Type / Returns	Description
Instance.AncestryChanged		Fires when the `Instance.Parent` property of this object or one of its ancestors is changed.
Instance.AttributeChanged		Fires whenever an attribute is changed on the `Instance`.
Instance.ChildAdded		Fires after an object is parented to this `Instance`.
Instance.childAdded
Instance.ChildRemoved		Fires after a child is removed from this `Instance`.
Instance.DescendantAdded		Fires after a descendant is added to the `Instance`.
Instance.DescendantRemoving		Fires immediately before a descendant of the `Instance` is removed.
Instance.Destroying		Fires immediately before (or is deferred until after) the instance is destroyed via `Instance:Destroy()`.
Instance.StyledPropertiesChanged		Fires whenever any style property is changed on the instance, including when a property is set to `nil`.

Inherited from Object

Name	Type / Returns	Description
Object.Changed		Fires immediately after a property of the object changes, with some limitations.