Constant Velocity
The activity generate a displacement stage on the Cam, climb (displacement +) or slope
(displacement -) following the Basic Curve with constant velocity of the follower and zero the
acceleration.
It is suggested to don’t use this Basic Curve for the first stage and to introduce them with a
Dwell–Concentric circle.
If this is unavoidable, we suggest using one of the Advanced options that are proposed.
Radius Fillet .
Select Radius and define its value to obtain the fillet; the Radius must be greater than the Radius
of the roller follower.
Motion Fillet.
Select the Basic Curve to be used, define the angle Beta representing the width of the stretch of
fillet.
The calculus preserves the position and the slope of the stage at Constant velocity modifying the
entry and exit to insert the fillet.
When the previous Basic Curve lets the permission, it is applied a transposition of the complete
stage, including the fillet, in order to preserve the start and exit position of the stage at Constant
velocity in respect to the preceding Basic Curve.
The stage at Constant Velocity has preserved its position and slope while the fillet covered a part
of the preceding Basic Curve
The operator will decide to modify the application angle of the subsequent Basic Curve in order
to compensate the part covered by the exiting fillet.
In the following sample are defined five Basic Curve as :
1. Stage at Dwell – Concentric circle : 60° deg.
2. Stage at Constant Velocity : 90° deg ; displacement 15 mm ; Beta Fillet 20° deg.
3. Stage at Dwell – Concentric circle : 50° deg.
4. Stage at Cycloid : 90° deg ; displacement -15 mm
5. Stage at Dwell – Concentric circle : 60° deg.
The operator can to notice :
· The initial stage at Dwell is reduced to 50° deg ; 10° deg are engaged by the fillet.
· The stage at Constant Velocity including start and exit fillet results 20° deg greater.
· The second Dwell stage has been defined of 50° deg rather than 60° deg to make room to
the exiting fillet
· The subsequent stages preserved their width and position.
By activating the Not Change Angle/Length option, the interval specified in the initial
DIALOG-BOX (Rotation Angle) will be maintained.
CMM2000 Help
