Eccentric cammotion graph

Cam-Action Hold-Down Clamps. The cam-action hold-down clamp, shown in Figure 8-77, is another clamp that uses a cam-action to apply holding force. The cam here is also a spiral design with a 2-1/2º wedge angle. It permits a clamping range of 3/16”. This clamp is made of cast steel with flame-hardened wear points. The solid arm can be used to clamp workpieces directly, or tapped to mount a threaded clamp spindle.

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The spiral design, although an improvement over the eccentric design, is still subject to loosening under heavy vibration. For this reason, a mechanical lock is a good idea for applications, such as extremely heavy milling, where considerable vibration can occur.

Snailcam

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CARR LANE MANUFACTURING 4200 CARR LANE CT. P.O. BOX 191970 ST. LOUIS, MO 63119 Phone: 314.647.6200 Fax: 314.647.5736

Pearcam

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With eccentric cams, special care must be exercised to keep the cam locked during the clamping cycle. Eccentric cams only have one true locking point. This is the point at which the vertical center lines of the eccentric mounting hole and the lobe are perfectly aligned and exactly perpendicular to the clamped surface. Any other cam position cannot provide a positive lock. For this reason, eccentric cams are generally not suitable for workholding applications.

Up-Thrust Clamps. The up-thrust clamp, Figure 8-76, is a unique clamp design. It holds a workpiece with pressure from below. As shown at (b), pushing the cam handle down moves the clamping element upward against the workpiece. The underside of the top jaw element has a ground surface and acts as a precise locator for the clamped workpiece. This clamp is designed for workpieces that must be located and machined on the top surface.

Eccentric camfollower

Eccentric cams, as their name implies, apply the clamping force with the action of an eccentric circle. As shown in Figure 8-71, these cams have a mounting hole positioned off center in the cam lobe. The off center location of the mounting hole produces the “rise,” the radial movement of the cam through its clamping cycle.

The most suitable applications for cam clamps are where workpiece vibration is minimized. Drill jigs, light-to-medium- duty milling fixtures, inspection fixtures, and assembly tools are all safe, effective applications for cam clamps.

Eccentric camexamples

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what are some attributes of aneccentriccam?

Eccentric camreview

Standard cam-clamp designs include cam-action strap clamps, cam edge clamps, up-thrust clamps, and cam action hold-down clamps. Each of these clamps has been designed to reduce the effects of vibrations and to maximize clamping efficiency.

Concentriccam

Cam Edge Clamps. The cam edge clamp, shown in Figure 8-75, uses a horizontal single-cam handle with a 180º maximum throw. The pivoting nose element of the clamp applies force both forward and downward to securely hold the workpiece. These clamps are available with either a standard base for fixed-position mounting, or a slotted base for adjustable mounting.

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Cam clamps are also based on the principle of the inclined plane. The most common forms of cam clamps are the eccentric cam and spiral cam. Depending on their arrangement, these cams can be used as directpressure clamps or indirect-pressure clamps.

Cam-Action Strap Clamps. Two examples of cam-action strap clamps are shown in Figure 8-74. The clamp shown at (a) has a standard slotted-heel clamp strap, while the clamp at (b) has a double-end clamp strap. Both clamps utilize an eye bolt and double cam, instead of the stud-and-nut assembly. Both these clamps apply indirect force to the workpiece through spiral cams, and are suitable for all but the heaviest machining with excessive vibration.