Swing Clamps Standard Features
Patented V-groove cam design
Air Ordering Information
Frequently Asked Questions
Where and when should I use swing clamps?
Swing clamps are a logical choice where loading of the part is hampered by other styles of clamp. Swing clamps (as their names indicate) move out of the way for easy access to the load/unload area. They may be easily visualized by tool designers and the action emulates that of manual strap clamps which have been used for years.
Are there some applications where I need to avoid using swing clamps?
Yes, swing clamps should not be used when there are no fixed stops or hard locators into which the cutter force is transmitted. If swing clamps are oriented to hold vertically, horizontal cutter forces should be transmitted into solid stops that can easily absorb their energy. If forces are transmitted to swing clamps at 90° to the clamp action, all of the force is transmitted into the rotating mechanism. This may result in premature wear and early failure.
How do I size swing clamps?
First, calculate your cutter forces forces to be resisted. Then examine the direction of these forces. Determine how much of these forces will have to be held by the clamp. Size your clamp based on the estimated working pressure of your fixture. (We recommend using 3,000-4,000 psi at this point to give you some additional capacity if required when your fixture is complete or processes change.)
I want the fastest possible action from my swing clamps. How do I do that and how fast can I get?
Look at the Clamp Time and Fluid Flow Rates chart to determine flow rates. If you are unable to determine flow rates, use the time limitations indicated under the same footnote. A good rule of thumb, "If you see the clamp open, then see it closed, but don't see it move between, it moved in less than 1/16th second. That is always too fast." Finally, ask yourself; "To what good use will the operator put that extra fraction of a second?" If the answer is none, slow the clamp down.
I am planning to exceed the flow rating of your clamps, but I will be using low pressure (750 psi). That's OK isn't it?
No. Excessive speed is excessive speed, regardless of pressure. Swinging an arm against a cam faster than intended is not recommended. It will shorten clamp life even at low pressures. We recommend not exceeding maximum flow rates. The flow control swing clamp may be your solution.
My swing clamps don't all contact the part at the same time. Why?
Flow restrictions, excess fittings, long tubing runs and different springs can all cause swing clamps to swing at different times. Despite the appearance, they actually build to pressure at approximately the same time. Because some customers (often the machine operators) are sensitive to the timing of their swing clamps we created the flow control swing clamp. Look to this clamp as a solution to the timing sensitive problem or add your own flow control valve at each swing clamp.
NOTE: Do not use this as a sequence valve.
I want to run my swing clamp on air; is this easily done?
We have designed pneumatic swing clamps. It can be done for the three larger sizes of hydraulic swing clamps (excludes Low Profile models). The smallest swing clamp may not be changed to air. It is extremely difficult to control air flow into or out of a pressure vessel this small. We do not recommend that the smallest clamp be converted to air, nor will we warrant its use in this application. Please call us for specific ordering details.
My application calls for an arm about the size of a baseball bat. It only weighs 14 lb. How fast can I swing it?
VERY SLOWLY! Weight, like flow, can damage a swing clamp. If you must use an arm exceeding the weight of our standard or extended arm, slow it down. Heavy arms should be used on double acting clamps only, and swing speed must be restricted in both directions. Remember the Arm Length and Pressure Limitations from the charts provided.
I want to use a 450 lb. swing clamp but need a 5,000 lb. swing clamp arm for length. How do I fit this arm onto the clamp? What are my flow and pressure restrictions?
You will have to add to an extended arm or make a custom. We cannot supply an arm modified to these specifications. A reach of this distance is not recommended. If you must reach beyond the limits charted, please consult Vektek's engineers.
I need to clamp over a work support. Are there any special precautions that I should take?
Yes, you will want to be sure that the clamp is sequenced to swing only after the support has built sufficient pressure to hold the force it is capable of generating and that they are properly sized. Sequencing is recommended only above 2,000 psi using a Vektek sequence valve (other brands will not work). The recommended swing clamp to work support ratio is approximately 1:2 (1,100 lb. swing clamp, 2,500 lb. work support).
My part won't take 5,000 psi. How do I make your clamps work?
Your part doesn't have to take 5,000 psi. The force exerted on your part is determined by the pressure (in psi) times the piston area (in sq. in.). The force exerted by VektorFlo® swing clamps ranges from 450 to 5,000 lbs. at 5,000 psi input pressure. If you adjust the pressure down to 2,500 psi, your force will range from 225 to 2,500 lbs. depending on the model selected. You can generally adjust your pressure from 750 to 5,000 psi and get just the force you need to hold your part properly.
Threaded Body Long Stroke
Machined on most Vektek swing clamps, the Arm Clocking feature will dramatically reduce the time it takes to change arms for maintenance, replacement or design set up. This innovation eliminates the need for expensive special swing clamps and moves cost effective user modifications to the clamp arms.
A drill point on each clamp standardizes arm location at a particular position. A second orientation drill point resides 180° out from that position. Access to the positioning feature is through the back or side of the arm, making modification a snap for users. Each arm position can have its own specification.
Swing Clamp Swing Restrictors
Swing Restrictors add just one more element of flexibility when using Vektek Swing Clamps. Normally shipped with the swing angle set to 90˚, you can have swing restrictors added to your clamps to limit the the arm swing to 30˚, 45˚ or 60˚of rotation. Restrictors that are factory installed on new product will be specially marked to avoid intermingling clamps with varying swing angles in your shop. Contact your Vektek Customer Service specialist should you need swing angles greater than 90˚.
LP SC 5000/22kN
LP SC 7500/33kN
Clamp Time and Fluid Flow Rate Chart
ILS150108 REV G
- The above flows are maximum recommendations and clamp times are minimum recommendations.
- For upreach and double arms, use extended arm flows and times.
- The actual time to position the clamp will vary by custom arm configuration and may require customer testing in specific application to establish limits.
Arm Length and Pressure Limitations
Arm lengths and pressures operating at or below the curves shown are in teh safe operating zones for the clamp model indicated.