MechDesigner Glossary-EN

Glossary

element-names with a short description. For reference only.

Element Names

'Element' is the generic name we use for the objects that we add to the model.

Each Element has an:

Element Name
The default name of an element is: 'element-name + number'. After you add an element to the model, you will see it in the Assembly-Tree.

For example: Part1, Pin-Joint7.

You can rename elements.

Element Icon
The elements icons we add to the Assembly-Tree for each element you add it to the model is a small image that represents the function of the element.
You cannot change the icon.

Derived Element Names

To help with instructions in the tutorials, we also use Derived Element Names.

For example, other names for a Part are: 'Connecting-Part' is the derived element name for a 'Part with a Ball-Joint at each end'; 'Added-Part' is a Part that we add to the model. Base-Part is the frame of each Mechanism-Editor, Motion-Part is a Part that is assigned a motion.

'Connecting-Part' is easier is easier to say than: 'Part with a Ball-Joint at each end' each time we want to add a spatial mechanism.

Glossary / Terminology of Element Names and Derived Element Names

Elements Groups

Element Names

 

Derived Names

Short Description

MACHINE MODEL

Model

The Model Element at the top of the Assembly-Tree in the Model name-tab.

 

Model Frame

The Model Frame is fixed. It is the 'absolute ground'. This is also called the Machine-Frame. Compare to the Base-Part

Model-Editor

Model-Editor


The working environment to see the Solids in the Model. You can also add Planes and new Mechanism-Editors to Planes.

 

Model graphic-area

The workspace to see and edit the Model.

 

Model Contextual Toolbar

The Toolbar that is vertical and to the left of the Model graphic-area.

 

Model name-tab

The tab at the top of the Model graphic-area. There is only one Model name-tab. It is the left-most tab.

 

Model Triad

The X, Y and Z–axis arrowheads at the Origin (0,0,0) of the Model.

Mechanism-Editor

Mechanism-Editor

The Editor to Parts, Joint and Motion to assemble kinematic-chains. *Kinematic-chains = Mechanisms, Linkages.

 

Mechanism graphic-area

The workspace for each Mechanism-Editor

 

Kinematic-elements toolbar

A Toolbar that is vertical and to the left-side of the Mechanism graphic-area.

 

Machine-elements toolbar

A Toolbar that is vertical and to the left-side of the Mechanism graphic-area.

 

Kinematic-FB toolbar

A Toolbar that is vertical and to the right-side of the Mechanism graphic-area.

 

Mechanism name-tab

The tab at the top of the Mechanism graphic-area.

 

Mechanism-Plane

The Plane you select to add a Mechanism-Editor.

It is easier to write 'Mechanism-Plane' than 'the Plane with which the Mechanism is related'.

 

Mechanism Origin

The 0,0 Point of each Mechanism-Editor. The +X-axis is horizontal.

The Base-Part has the same Origin and +X-axis direction as the Mechanism-Plane

The X and Y-axes in the Base-Part identify the Mechanism Origin.

 

Master-Machine-Angle (MMA)

The Machine Angle. It is between 0 and 360. The Master-Machine-Angle 'beats the drum' of the machine as it moves from 0 to 360 and then repeats, when you cycle the model

All of the Function-Blocks and kinematic-chains move in response to the MMA.

 

Machine Cycle

One full cycle of the Master-Machine-Angle from 0 to 360

Part-Editor

Part-Editor

The Editor to Edit a Part. The working environment to add sketch-elements, sketch-constraints and dimensions to Parts.

 

Part

Parts represent the physical entities in a machine. For example: Piston, Connecting Rod, Crank-shaft, ...

 

Part graphic-area

The workspace for the Part-Editor

 

Geometry Toolbar

The vertical Toolbar to the left-side of the graphic-area when the Part-Editor is in use.

 

Constraints Toolbar

The vertical Toolbar to the right-side of the graphic-area when the Part-Editor is in use.

 

Part name-tab

The tab at the top of the Part graphic-area.
The Part name-tab name replaces the Mechanism name-tab name when you edit a Part.

PLANES

Plane

A flat surface to which we add Mechanism-Editors

Mechanism-Plane

A Plane you select to add a Mechanism-Editor. It is easier to write 'Mechanism Plane' than 'the Plane with which the Mechanism-Editor is associated'.

We assemble kinematic-chains on Mechanism-Planes.

The Mechanism-Plane does not need to be fixed relative to other Mechanism Planes or the Model Frame. A Mechanism-Plane can move relative to the Model Frame, and other Mechanism-Planes.

Part Plane

It is easier to write Part Plane than 'the Plane that the Part specifies, by virtue of its Origin and X-axis and CAD-Line'. We add sketch-elements to the Part Plane in the Part-Editor.

The Part Plane and the Mechanism Plane are co-planar, unless it is a Connecting-Part.

ORIGINS AND AXES

Model Origin and X, Y, Z-Axes

Global, Machine Frame Axes in the Model Editor.

Mechanism Origin and X, Y, Z-Axes

The same as the Plane and Base-Part Origin and Axes.

Part Origin and X, Y, Z-Axes

Origin at the start-Point of the CAD-Line; X-axis along the length of the CAD-Line. The Z-Axis is normal to the Mechanism-Plane.

PARTS

Part

Parts are the physical elements in a machine. An important element in each kinematic-chain. We also call a Part an 'Added-Part', Completely Free-Part, Free-Part, 'Connecting-Part'

Base-Part

The fixed Part and axes in the Mechanism Frame. The fixed Part at the Origin of the Mechanism-Plane in each Mechanism-Editor. The Origin of the Base-Part is the same as the Mechanism-Plane.

Connecting-Part

A Part we join to other Parts with Ball-Joints.

Added-Part

Added Part is a Part, not a Base-Part.

Geared Rocker Part

The Part that has its motion specified by the input motion to the Gear-Pair, the ratio of Gear Teeth in the Gear-Pair, and the selection of internal or external mesh.

Part-Outline

A SYMBOL used to identify a Part in the Mechanism-Editor. You cannot edit this symbol.

Motion-Part

The Part in a kinematic-chain that is given a Motion-Dimension FB. Its motion is specified by the input motion-values to the FB

Kinematically-Defined Part

A Part that has a mobility of zero. It has a Green Part-Outline

Free-Part

A Part that is not yet a kinematically-defined Part. It has a Blue Part-Outline. It requires one more Joint to make it a kinematically-defined Part.


Completely Free Part

A Part that is not yet connected to any other Part.

General Names for Parts

Other useful descriptive names in the text of the help.

 

Rotating-Part

A Part joined to a different Part with a Pin-Joint.

 

Sliding-Part

A Part joined to a different Part with a Slide-Joint.

 

Translating-Part

A Part that moves in a Plane and does not rotate. It may be a Siding-Part, but not necessarily.

 

Reciprocating-Part

A Part that slides back and forth along a Line and does not rotate. It does not Index.

 

Oscillating-Part

A Part that rotates back and forth about a Pin-Joint. It does not Index.

 

Indexing-Part

A Part that moves progressively in the same direction. Usually, the Part moves then Dwells, and repeats.

 

Free Part

A Part that has a minimum of one degree-of-freedom. It's position is not fully specified. It is joined to a different Part. It has a Blue Part-Outline. It has one or two degrees-of-freedom.

 

Completely Free

A Part that does not have a joint with any other Part. It has a Blue Part-Outline. It has three degrees-of-freedom.

JOINTS

Pin-Joint

It makes a Point in two separate Parts align; the Mechanism Planes align.

Slide-Joint

It makes a Line is two separate Parts coincide; the Mechanism Planes coincide.

Ball-Joint

It makes a Point is two separate Parts coincide; the Mechanism Planes do not coincide.

 

Magnetic-Joint

A joint to force a circular Profile become in contact with an irregular Profile [or Curve from Point-Cloud].

CAMS

2D-Cam

A Cam that can be shown on one Mechanism Plane.

3D-Cam

A Cam that cannot be shown on one Mechanism Plane.

Cam-Plate

The parent to a Cam in the Assembly-Tree. It can be a parent to many Cams.

Cam-Follower

A Profile*, a shape to give the Cam-Follower, that is in continuous contact with the Cam surface. The Profile is in a Part. (*Profiles are solid extrusions that are extruded from a sketch-loop).

Cam-Shaft

A Part that usually rotates continuously in one direction

Cam-track/groove

The space between Cam 1 and Cam 2 (the internal and external Cams). It may be a groove, slot or rib.

GEARS

Gear-Pair

The pair of gears that you edit to modify the number-of-teeth, the module, and the mesh.

 

Geared-Rocker

The kinematic element at the output of a gear-pair that is operated by the gear with a motion at the input to the Gear-Pair

 

Rack Driven Pinion

Pinion Driven Rack

The Rack and Pinion element is joined kinematically. Either the motion of the Pinion is found by the known motion of the Rack, or the motion of the Rack is found from the known motion of the Pinion.

Hence, in the Kinematics Tree, the terms are 'Rack driven Pinion', or 'Pinion driven Rack'.

BELTS

Pulley

A Rotating Part [Pulley] that either drives a Belt, or a Belt drives the Pulley.

 

Belt Driven Pulley

Pulley Driven Belt

The Belt and Pulley elements are joined kinematically. Either the motion of the Pulley is found by the known motion of the Belt, or the motion of the Belt is found from the known motion of the Pulley.

Hence, in the Kinematics Tree, the terms are Belt driven Pulley, or Pulley driven Belt.

DIMENSIONS

Dimension

A distance, angle or length

'Static' Dimension

A Derived Name. To imply the dimension does not change with time or machine angle.

Motion-Dimension

The Motion-Dimension identifies the Part we will move with a specified motion. We call the Part a Motion-Part.

Measurement Dimension

A driven* dimension between two sketch-elements. You use a Measurement FB to measure in the Mechanism-Editor. (*Driven: we can only observe and analyse its value). The Measurement also gives its first and second derivatives.

Reference Dimension

A dimension that gives a measurement between two sketch-elements that are in two separate Mechanisms

FUNCTION-BLOCKS : FB

Function-Block [ FB ]

Each Function-Block has an output-connector that provides motion-values that can be connected to the input-connector of a different FB. The motion-values at the output-connector are a function of the motion-values at its input-connector, the MMA or the measurement taken from a different kinematic-chain.

We use the acronym FB for Function-Block in the help text.

 

Linear-Motion Function-Block

'Clock'

A FB whose output mirrors the Master-Machine-Angle (MMA). You can change the phase of its output relative to the MMA with the Linear-Motion dialog-box.

Motion FB

A FB linked to a motion in MotionDesigner. The output mirrors the Y-axis of the Motion. The values at the input-connector represent the X-axis of the Motion.

Gearing FB

A FB to apply a simple mathematical function to the input. You can also add a number before and after you multiply the input with the ratio.

Motion-Dimension FB

The Motion-Dimension identifies the Part you will move with a specified motion.

Motion-Path FB

The Motion-Path FB identifies the Sketch-Element in a Part, to which we add a Point at the origin of the sketch-element. A Motion FB will define how the motion moves along the sketch-element.

Point-Data FB

A measurement of a Point – it gives X and Y coordinate motion-values. (Position, Velocity and Acceleration) and also the Magnitude of the Point's motion. The Point-Data can also be used as an independent variable for other FBs.

Measurement FB

A measurement between sketch-elements; to give motion-values. You can use Measurement Data as an independent variable for other FBs.

Cam-Data FB

A FB linked to a 2D-Cam to calculate Cam-Coordinates and provide data for Cam Analysis.

Graph FB

A FB to show data during a machine cycle

Spring FB

A FB to apply Force between two Points

Force-Data FB

A FB that provides Force and possibly Torque data, at a Point or a Motor.

Design-Set FB

A collection of Dimensions and Motion-Dimensions from different Parts.

Maths FB

A FB to do mathematical functions based on the input variables and parameters.

Stats FB

A FB to do Statistics based on the motion-values at its input-connector

Polynomial Fit FB

A FB to fit, mathematically, with polynomial functions.

3D MODEL ELEMENTS

Solids

The generic name for the Profile/Extrusion we can add with the tools in MechDesigner, and a Solid we can import from CAD.

 

Profile

Two contours that are offset from the Mechanism-Plane. The shape of the contours mirrors a sketch-loop in a Part.

Extrusion

The filled space between the Profile contours. The extrusion also has other properties: colour, transparency, density, moment of inertia, mass.

Auto-Profile

A convenient Profile; a sketch-loop and a Profile added to a mechanism with one command - Add Auto-Profile.

Hole

A cut through an Profile/Extrusion

TOOLS

Element-Properties

A dialog to show the exact element properties.

Trace-Point

The locus of a Point that shows on the Mechanism-Plane

 

Briefcase FB

A tool to put other FB inside - to make the model easier to manage.

DXF ELEMENTS

 

CAD-Line

A Line used to link with a DXF Drawing or STL File.

DXF File

A file that you import (open). It has the standard DXF format.

DXF-Element

A DXF element in the Assembly-Tree, put there after you open a DXF file

DXF Outline

A complete DXF Drawing in the graphic-area. You cannot edit it.

DXF Entity

A single line, arc or circle entity in a DXF Outline. You cannot edit it.

DXF Drawing

An external DXF Drawing. You can edit it with other CAD.

DXF Layers

A 'sheet' in a DXF Drawing. You can show or hide each DXF Layer.

DXF Origin

The origin of the DXF drawing in the original CAD drawing.

CAMLINKS MEC

Camlinks Outlines

DXF, or Polyline, that was imported into a Camlinks model, and subsequently imported into MechDesigner. You cannot edit a Camlinks Outline.

KINEMATIC TERMS


Kinematics-Tree

One of three trees in the Project-Explorer

kinematic-chain

Parts joined with Joints, with a minimum of one joint to the Base-Part.

Kinematically-Defined Part

A Part in a kinematic-chain with a Mobility of Zero. It has a Green Part-Outline

Kinematically-Defined Chain

A kinematic-chain with only kinematically-defined Parts. All of the Part-Outlines are Green. Each kinematically-defined chain has mobility of zero

Kinematic-Pair

A Joint: Lower-Pairs, Higher Pairs and Wrapping Pairs

Part

Perfect Rigid Body. It has an exact length.

Rocker

Motion-Parts: A Part joined with a Pin-Joint, and its motion is specified by a motion-values at the input-connector of a Motion-Dimension FB.

Slider

Motion-Parts: A Part joined with a Slide-Joint, and its motion is specified by motion-values at the input-connector of a Motion-Dimension FB.

Geared-Rocker

A Part whose position is determined by the motion at the input gear (drive gear), the number-of-teeth on each gear, and the mesh (internal or external)

Revolute-Joint (Pin-Joint)

Pin-Joint: A Joint with a Point in two different Parts that are made to be coincident

Prismatic-Joint (Slide-Joint)

Slide-Joint: A Joint with a Line in two different Parts that are made to be coincident.

Spherical-Joint (Ball-Joint)

Ball-Joint: A Joint with a Point in two different Parts - that can also be in a two different Mechanism-Editors - are made to be coincident.

Dyad:

Each Dyads always has two Parts and three Joints

RRR Dyad

Planar Dyads

The two Parts in a Planar Dyad lie on one Mechanism-Plane.

The joints are Pin-Joints or Slide-Joints.

RRP Dyad

RPP Dyad

RPR Dyad

PRP Dyad

SSR Dyad

Spatial Dyads: One Part lies on a Mechanism Plane; the other Part in the Dyad joins Parts in two different Mechanism Planes.

SSP Dyad

RAM-R

Dyad that uses a Motion-Point to guide a Point.

RAM-P

Dyad that uses a Motion-Point to guide a Point.

Kinetostatic Force Terms

 

Force

The force needed to drive Parts with the motion given to them. Mass, Gravity or external Force applied to them.

 

Torque

The moment that is needed to rotate a Part with the motion given to it and any other Parts joined to it.

Project-Explorer

Project-Explorer

To the left of the Graphic Area

Selection-Window

Identify the elements you select in the graphic-area or the Assembly-Tree

Command-Manager

It provides hints or instructions for the active command. It may also open a short dialog, where you need to select one or more elements, to complete a command

Element-Explorer

List the Elements in the Model in various formats

Assembly-Tree

A hierarchical and chronological List of the Elements you have added to the model

Kinematics-Tree

A list of the kinematic-chains with Motion-Parts, Dyads and Geared-Rockers that may be in each Kinematic-chain

Geometry-Tree

A list of Constraints and Dimensions in the sketch-elements. It is only available when you use the Part-Editor.

Feedback-Area

 

Message Area

The Area below the graphic-area. It gives you information, warnings and errors for each command that fails to complete.

Hints and Instruction

The hint, with a short instruction, of the active command, or the command as you move your mouse-pointer above a command or tool.

Animation Speed Slider

Tool to speed up or slow down the animation

Force Vector Scale

Buttons to increase or decrease the length of Force Vectors

Torque Vector Scale

Buttons to increase or decrease the length of Torque Vectors

Velocity Vector Scale

Buttons to increase or decrease the length of Velocity Vectors

Acceleration Vector Scale

Buttons to increase or decrease the length of Acceleration Vectors

Master-Machine-Angle

The Machine Clock.

'Revs'

Number of revolutions of the Machine.

ELEMENTS IN THE Part-Editor

 

Dimension

A 'Static' Dimension. Note : it is possible to make a dimension to be a 'Motion Function'.

Dimension Tool

Use the dimension tool to add a Static Dimension: between Points, two Lines, three Points, a Line and a Point, the Length of a Line, the radius of a Circle

Sketch-Elements

Line

A Line has a point at each end - the start-Point, at the Origin of the Line, and the end-Point

Arc

An Arc has a Point at each end, and a centre-Point.

Circle

A Circle. It has a Point at its centre, called the centre-Point.

Point

A point is a Point!

start-Point

The Point where you mouse-button-down at the start of a Drag to add a sketch-element or Part

end-Point

The Point where you mouse-button-up at the end of a Drag to add a sketch-element or Part

centre-Point

The Point at the centre of an Arc or a Circle

Blend-Curve

A 'spline' that you can edit, at each end, its angle, curvature and rate of change of curvature.

CAD-Line

A Line that you can use to link and show a DXF Drawing, a SOLIDWORKS, or STL files.

Polyline

A shape that mirrors the shape of a 2D-Cam or Gear-Pair.

Spline

A shape defined a series of points with curvature continuity at and between Points.

 

Reference sketch-element

A sketch-element copied from a different Mechanism-Editor. It is orange.

Sketch-Element Constraints

Coincident

To make two Points, two Lines, a Point and a Line, or a point and X or Y-axis to be at the same location or along the ray of the line or axis.

Concentric

To make two Circles, Arcs, or a Circle and an Arc, have the same centre-point.

Equal

To make two Circles or Arcs, or two Lines, have the same radius or length.

Parallel

To make the Points at the ends of two lines, or a line and an X or Y-axis, to be equally far from each other.

Perpendicular

To make two Lines, or Line and an X or Y-axis perpendicular.

Mid-Point

To make a Point join to the mid-point of a Line

Tangent

To make a Line and Circle or Arc tangent, or a Circle and a Circle tangent.

Horizontal

To make a Line or two Points Horizontal.

Vertical

To make a Line or two Points Horizontal.

Tutorial and Reference Help Files for MechDesigner and MotionDesigner 13.2 + © Machine, Mechanism, Motion and Cam Design Software by PSMotion Ltd