-> Parameters tab

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2D-Cam > Parameters tab

2D-Cam dialog > Parameters tab

2D-Cam dialog > Parameters tab

Parameters tab

Click to exapand /collapse Cam Range and Radius...      
Cam Range and Radius tab

Cam Range and Radius tab

Red-14-1 Radial Clearance (mm) Default = 0

Cam without Radial Clearance

Cam without Radial Clearance
Cam with 0.2mm Radial Clearance

Cam with 0.2mm Radial Clearance

When Radial Clearance ≠ 0 we calculate for you a Cam-Profile that is offset from the true Cam-Profile.

Examples Radial Clearance ≠ 0

1.Groove-Cam: Radial Clearance =+0.05 : a small clearance for a Roller bearing to fit between the Cam-Flanks of a Groove cam-type.

2.Conjugate-Cam: Radial Clearance =+0.05 : a small clearance to compensate for assembly tolerances with a Conjugate cam-type.

3.Rough-Cut: Radial Clearance = –0.5 : to export data for a rough-cut of the cam (opposite to clearance)

Notes:

a)You can also edit this parameter in the Cam-Coordinates dialog.

b)Stud-type Follower-Roller usually have a large negative tolerance bias - for example. - which may be enough, or too much, clearance for a Groove cam-type.
Cam-Profile RED = Warning

Cam-Profile RED = Warning

Red-14-2 Cam ROC 'Soft-Limit' ( %)

Default: see Application Settings > General tab > Cam Radius Soft-Limits = Default value.

This parameter compares the Cam's radius of curvature (ROC) with the Roller's radius.

Warning if ...

... then the Cam-Profile is RED as a warning.

For example: Cam ROC 'Soft-Limit' = 100%

The Cam-Profile is RED where the Cam's Radius-of-Curvature is less than the Roller's Radius.

Cam: Range < 360

Cam: Range < 360

Red-14-3Cam Start - Default = 0 ; Red-14-4Cam Range - Default = 360

•Use Cam-Start to start calculating the Cam-Profile at a different Master Machine Angle.

•Use Cam-Range to display the cam for less than 360° of the machine-cycle

Application examples:

E.g.1: A Cam-Part rotates 2 times / machine-cycle, then enter Cam Start: 0 and Cam Range : 360 / 2 (revs)

E.g.2: To hide one side of a Slot-Cam.
Click to exapand /collapse Enable Lifetime, Edit Safety-Factor  
Enable Show Roller and Cam Lifetimes

Enable Show Roller and Cam Lifetimes

☑Show Roller and Cam Lifetimes

If you enable Show Roller and Cam Lifetime, the 2D-Cam dialog has two new tabs:

•Roller Life - see Roller Life

•Cam Life - see Cam Life

With these tabs:

•We can calculate for you the life of the Outer or the Inner cam-profile. We remove the Groove options in the Display tab

•We display Force-Vectors. To hide Force-Vectors, see Forces toolbar > Force-Vectors - Display

See Display tab > Cam Display options  

Safety-Factor (Cam)

We apply for you the Safety-Factor to the Cam's Contact-Stress and the Roller's Equivalent Contact-Load

Cam Life tab

Cam's Dynamic Maximum Contact-Stress = Max Contact-Stress × Safety-Factor (cam)

Roller Life tab

Safety-Factor (Roller) = Safety Factor (Cam)2

Roller's Dynamic Equivalent Load = Equivalent Load × Safety Factor (Cam) × Safety Factor (Cam)  

E.g: If Safety-Factor (Cam) = 1.1 ; Safety-Factor (Roller) = 1.21

The Safety Factor should consider at least the following.

What drives the Cam-Shaft? Is it a constant speed servo-motor or a single-cylinder diesel engine?

What does the Follower drive? Is it a simple paper-tucker, or a forging, stamping press?

What is the stiffness, rigidity, inertia, natural-frequency, of the load - is it a long, thin shaft, or a short, stub spindle?

What is the severity of the motion - does it have jerk continuity, or acceleration discontinuity?

How much backlash - does it have forged spur gears, or a precision Planetary gear-box with helical gears?