MechDesigner Glossary-EN

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MechDesigner Glossary-EN

Terminology and Glossary

This glossary lists the terms we use in MechDesigner and this Help documentation

Element-Names - those elements we explicitly add to the model

Derived Element-Names - names that we use to explain the instructions and understand the help

User-Interface - terms for the different areas of the MechDesigner application window, and general dialog-boxes.

Keywords - terms that are generally helpful

Element Names: Derived Element Names

Elements Groups

Element Names

Derived Names

Keywords

Short Description

MODEL

 

... the Model

The Model Element is the machine assembly. This element is always at the top of the Assembly-Tree.

 

Model-Editor

 

The editor for the machine assembly. To add Mechanism-Editors, Planes and to view the moving model.

 

Model name-tab :

 

The tab to select the Model-Editor.

 

 

Model Triad :

The Origin and the fixed Coordinate-System of the Model

X-axis (Red), Y-axis (Green) and Z-axis (Blue).

MECHANISM

Mechanism-Editor

 

The editor to add kinematic and machine-elements, and build kinematic-chains.  You must add one Mechanism-Editor. You can add many Mechanism-Editors .

 

Mechanism name-tab :

 

The tab to select a Mechanism-Editor.

 

 

Mechanism-Plane :

The XY-Plane of each Mechanism-Editor.

 

 

Mechanism Origin :

The 0,0,0 of the Mechanism-Plane. See also Base-Part.

 

Master-Machine-Angle (MMA) :

The angle (phase) of the Machine, from 0 to <360.

 

 

Machine Cycle

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

PART

Part-Editor

 

The editor to edit Parts, to add sketch-elements, sketch-constraints and dimensions.

PLANES

Plane

 

A surface defined by its XY-axes

Mechanism-Plane :

 

The XY-axes of a Mechanism-Editor

Part Plane :

 

The XY-axes or a Part

PARTS

Part / Added-Part.

 

A Part represents a machine component. Occasionally, it represents a virtual machine-element..

Base-Part

 

The fixed frame of the Mechanism-Plane

Geared Rocker Part

 

The Part that is driven by a Gear-Pair

Part-Outline :

 

The SYMBOL to identify a Part

 

Derived-Names for Parts

 

Motion-Part :

 

A Part in a kinematic-chain whose position is specified with a Motion-Dimension FB.

 

Rotating-Part :

 

A Part that rotates around a Point.

 

Sliding-Part :

 

A Part that slides along a Line.

 

Translating-Part :

 

A Part that moves across a Plane and does not rotate.

 

Reciprocating-Part :

 

A Sliding-Part that moves from its original position, then moves in the opposite direction to its original position, again and again.

 

Oscillating-Part :

 

A Rotating-Part that moves from its original position, then moves in the opposite direction to its original position, again and again.

 

Indexing-Part :

 

A Part that moves progressively in the same direction.

 

Kinematically-Defined Part :

 

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

 

Connecting-Part :

 

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

 

Added-Part :

 

A Part. Not a Base-Part.

 

Free Part :

 

A Part that has a minimum of one degree-of-freedom. It has one joint with a different Part. It has a Blue Part-Outline.

 

Completely Free :

 

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

JOINTS

Pin-Joint

 

Revolute Joint :

It makes a Point in two separate Parts align; the Mechanism Planes align. Identical to a Revolute-Joint

Slide-Joint

 

Prismatic-Joint :

It makes a Line is two separate Parts coincide; the Mechanism Planes coincide. Identical to a Prismatic-Joint

Ball-Joint

 

Spherical-Joint :

It makes a Point is two separate Parts coincide; the Mechanism Planes do not coincide. Identical to a Spherical-Joint

 

Magnetic-Joint

 

A joint to force a circular Profile to have contact with an irregular Profile (or Curve derived from a Point-Cloud).

CAMS

2D-Cam

 

A Cam that is on one Mechanism Plane.

3D-Cam

 

A Cam that is not one one Mechanism Plane.

Cam-Plate

 

The parent to a 2D-Cam in the Assembly-Tree. It can be a parent to one or more 2D-Cams.

 

Cam Follower

 

The Profile/Extrusion* of the sketch-loop that defines the shape of the Cam-Follower, which is in continuous contact with the Cam surface. The Profile/Extrusion is a child to a Part.

 

Cam-Roller

A Cam-Follower that is circular.

 

Cam-Shaft

A Part, with a Cam-Plate, that usually rotates continuously in one direction.

 

Cam-Track, Groove, Rib.

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

GEARS

Gear-Pair

 

Two gears that you edit to modify the number-of-teeth, the module, and 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 & Pinion

Rack Driven Pinion :

Pinion Driven Rack :

 

The Rack and Pinion element is joined kinematically. Either the Rack motion 'flows' to the Pinion, or the Pinion motion 'flows' to the Rack. The Power may flow in the same or the opposite direction as the motion.

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

 

A driven* dimension between two sketch-elements. You use a Measurement FB to measure in the Mechanism-Editor. (*Driven: we can only observe and analyze 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

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 FB

Clock FB :

 

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. WE sometimes use the term Clock as it is equivalent to a Machine-Clock.

Motion FB

 

A FB linked to a motion in MotionDesigner. The motion-values at its input-connector correspond to the X-axis of the Motion with which it has a link, and the motion-values at the output-connector correspond to the Y-axis of the same 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 FB 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 measures Force or Torque data, at a Point or a Motor.

Design-Set FB

 

A user-defined 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 name for the Profile/Extrusion we add in MechDesigner, and also a Solid we can import from 3D-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: color, 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.

 

Pattern FB

 

A tool to create copies of a Solid, with their motion anticipated over a machine=cycle.

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 has two Parts and three Joints

R-R-R Dyad

 

Planar Dyads

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

The joints are Pin-Joints or Slide-Joints.

R-R-P 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, given their Mass, and inertia, and any 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'.

Smart Dimension

 

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 center-Point.

Circle

 

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

center-Point :

 

The Point at the center 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 'nodes' with curvature continuity at and between the 'nodes'.

 

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-axis 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 center-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-axis 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 two Points to have equal X-axis