These foot controls are designed to be rugged and dependable with a predictable feel and response regardless of age. A model of simplicity, they work by bleeding off air from the GraverMax/GraverMate units allowing the handpiece to start and run controllably. It is normal to hear air escaping when you push down on the throttle. The true beauty of this design is positive air pressure outbound helps to keep the bleed shaft and outlet valve clear of light debris.

A certain amount of understanding and care is needed to keep these operating at peak performance. Dirt and abuse is the bane of any mechanical device, foot throttles of all designs are no exception. These typically sit in the dirtiest spot in a shop, under the workbench, and are subjected to a daily diet of metal shavings and dirt. Even though the design is self cleaning, you can cut down on the wear by maintaining a clean floor under your bench. When you sweep, place the foot throttle on the bench or chair.

Frequently Asked Questions

QUESTION: I have to push down quite a way on the foot control to get the handpiece to move reliably. Why is this?

ANSWER: What air pressure are you using to operate your handpiece? Typically, over-pressurizing the handpiece will require more throttle to start. You may also hear more air hiss at the foot throttle as well. Follow the instruction manual suggestions for setting air pressure.

QUESTION: I hear air leaking from my foot control without my foot on the pedal.

ANSWER: The first thing to do is check the throttle hose. Many times a hose will become chaffed and develop a hole, instances have been seen where a renegade mouse has chewed on the hose as well. Check your hose first. On older units, this may signal the need for maintenance. Sometimes a careful cleaning around the outlet valve and bleed shaft will dislodge the particle which is holding the 2 pieces apart. If cleaning does not resolve the issue, it is better to return the foot control for a rebuild at Glendo/GRS.

QUESTION: I would like a softer start to my handpiece when I press down on the control.

ANSWER: A new progressive foot control (#004-519PRO) is now available. This design allows a predictable and consistent start-up for those who use their handpieces for bulino and banknote fine line cutting. See the online catalog for more information.