May. 06, 2024
Every Kwik-Way valve refacer chuck features two sets of 3 balls each that grip the valve stem on that part which travels in the valve guide. This patented design ensures perfect concentricity between the stem and the valve head and provides precision and reliability.
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The compound compensating, self-centering, six-ball chuck automatically aligns the valve, refacing it concentric with the original centerline of the valve system. This type of 2-point stem support is referred to as a “Centerless” grinding system.
The valve is kept firmly in place by pneumatic action, controlled either by a lock/release button or a convenient pedal. Pneumatic operated change-over also eliminates the need to switch off the motors when changing valves, reducing machining time and increasing life of motors.
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The 6-ball chuck supports variable valve rotation speed, which allows the operator to adjust surface speed and ensure the best surface finish for a wide range of valve head diameters. The standard chuck supports valve stems between ø 4 and 14mm, and an optional chuck is available for larger diameters ranging from ø 11 to 21mm. Other valve grinding machines can require up to 9 separate collets to achieve the same range.
The chuck itself is mounted on the head, which can then be inclined up to 62°.
My Sioux Valve Grinder # 645L and Portable Seat Grinder 1710S Sioux made valve grinders since the early 1920's. A must have single use machine for any antique car enthusiast such as myself. In the early days, up until the 1970's and introduction of unleaded gasoline, the valves on cars needed resurfacing between 50,000 to 70,000 miles. And it was cheaper to grind the old valves rather than purchasing new.After cleaning up the valves. The flat end is ground square to the stem. Then a small 45 degree chamfer is added flat end. Making for easier insertion in the head of block. But most important for truing the valve in the Sioux grinder head. Along with setting a stop making all valves the same length. Only old timer's know and understand this. I have read several poster's saying that they cannot get the valve to run truer than .005”. Saying that the three jaws in the work-head is not enough to hold the valve stem true. When in practice The back end of the work-head has a stop with a reverse taper. That center's the valve stem. And the three small jaws grabs 4” of 5” toward the valve head. And indeed makes for quick and accurate setup. Putting a test indicator the revolving valve reveals the TIR (Total Indicator Reading) of less than .001”.This is a Sioux Portable Valve Seat Grinder. The kit contains the power unit, numerous grinding wheels, positioning shafts, and diamond wheel dresser. This tool in a must have for quick and accurate valve seat grinding of flat head engines. The seat can be resurfaced without removing the engine from the car. Being that most early cars were valve in block design this was a very popular tool to own. However it's still can be used in valve in head engines. But many home mechanics just drop the heads off at a machine shop for someone else to do all the valve work...
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