Magnetic-Joint dialog-box
Use the Magnetic-Joint dialog-box to edit the settings of a Magnetic-Joint.
Background
The Magnetic-Joint is an unusual joint for MechDesigner.
'Standard' : Motion-Dimension FB gets its motion-values from Kinematic FBs at input-connector
Usually, motion-values at the input-connector to a Motion-Dimension FB specify the motion of a Motion-Part.
The motion-values at the input to the Motion-Dimension FB are predictable and planned.
'Magnetic' : Motion-Dimension FB gets its motion-values from the movement of a Part which is from a Magnetic-Joint
A Magnetic-Joint makes a circular profile in a Part become in continuous contact with an irregular* Profile in a different Part.
The motion of the Part with the circular Profile becomes a driven-Part. Its motion becomes a function of the shape and motion of the Part with the irregular* Profile.
The Magnetic-Joint calculates the motion-values [positional, velocity and acceleration] of the driven-Part. It can be used as a Motion-Part.
Note: * the shape of the irregular Profile can be derived from a Point-Cloud or a .
Open the Magnetic-Joint dialog box
Note: If you need to add a Magnetic-Joint, see .
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| 1. | Double-click a Magnetic-Joint FB icon in the graphic-area. |
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| 1. | Click the Magnetic-Joint FB in the graphic-area |
| 2. | Right-click the Magnetic-Joint FB in the Selection-Window |
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| 1. | Double-click the Magnetic-Joint FB in the Assembly-Tree |
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Magnetic-Joint dialog-box
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The Magnetic-Joint dialog-box has two separators:
Curve Following Options...
Radius Control
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 Curve Following Options
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| ☑ | 'Enable Magnetic-Joint' check box is active |
The circular Profile becomes in continuous contact with the irregular Profile or Point-Cloud.
| ❑ | 'Enable Magnetic-Joint' check box is cleared. |
The circular Profile is not in continuous contact with the irregular Profile or Point-Cloud.
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Outside
The refers to the relative position of the circular profile and the irregular Profile.
The image shows the 'Curve Following Profile' on the outer side of the 'Curve Shape Profile' .
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Inside
The image shows the Curve Following Profile on the inner side of the 'Curve Shape Profile'
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Radius Control
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Optionally, modify the effective radius of the Cam-Follower Roller.
| ❑ | 'Not Overriding Circle Radius' [default] |
The Circular Profile moves along the Irregular Profile.
The 'Radius' parameter is now 0mm and Read-Only
Click the check box to be able to overlap of the Circular Profile relative to the 'Irregular' Profile.
Radius parameter box.
| • | When the Radius parameter is '0mm', the Centre of the Circular Profile moves along the Irregular Profile as normal. |
| • | When the Radius parameter is '3mm', the Centre of the Circular Profile is 3mm inside the Irregular Profile. |
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This is useful if you use a CMM machine with a probe diameter that is different to the Cam-Follower Roller, and the CMM software does not have 'Probe Compensation'.
When the CMM data does not compensate for the Probe Diameter, you would set the offset Radius to recreate a Cam-Follower system.
Offset Profile Radius = Radius of Actual Cam-Follower – Radius of CMM Probe
R = Rcf – Rp
Rcf = Cam-Follower Radius; Rp = CMM Probe Radius.
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