Customized Sliding Air Chucks

Northfield is continually developing new products, custom designed to solve the most difficult workholding problems for all metal, composite, ceramic and glass materials. Our engineers provide custom workholding solutions for internal/external, thin-wall/rigid, over-the-shoulder, and hundreds of other unique solutions to exactly meet each workholding requirement to bring gage block accuracy to your production pieces.

FULL WRAP CLAMPING

FULL WRAP CLAMPING

Custom Jaws mounted to a standard Northfeld Model NF-650 air chuck. The pie shaped top jaws provide a full wrap clamping around the work piece Jaw has a custom spring loaded locating pin assembly, which is used to orient ‘’time” the customer’s workpiece for verticle machining

COOLANT-THRU AIR CHUCK

COOLANT-THRU AIR CHUCK

Model 650W 6'' DIA Coolant-thru Air Chuck. It has Special hardened and ground Jaws to grip the customer’s part with a 39.74mm body. Jaws are made of 1018 steel case hardened and ground to 58/63 Rc. with a step machined in it to act as the part stop. Also it has a Special Face mounted Spyder locating base for Model 650; it has been hardened & ground to hold the customers special dressing ring. The customer wanted to be able to dress their grinding wheel in close proximity to the part that they grind with this chuck.

SPECIAL HARDENED/GROUND JAWS

SPECIAL HARDENED/GROUND JAWS

Model 450 4'' DIA Air Chuck with Special hardened and ground jaws to grip O.D. of a precision split bushing. The bushing is Special hardened and ground to locate on .8683 part diameter. Bushing has an O.D. of approximately 1.800 inches to clear flange. Bushings are made of alloy steel with I.D. and O.D. ground at the same time to insure tight tolerance runout run out.

DIAMOND COATED JAWS

DIAMOND COATED JAWS

Model 450 WHS (4In High-speed Chuck) gripping an aluminum die cast in its internal hex. The jaws are diamond coated for extra grip at lower pressure. The stop has three air detect holes for part seat sensing.

TOP TOOLING AIR CHUCK

TOP TOOLING AIR CHUCK

Model 625 Sliding-Jaw Air Chuck (0.0001” TIR) with special top tooling attached.
Our customer needed grip on the ID’s of their CVT transmission sheaves for runout inspection.
Top Jaws are permanently mounted onto the chuck’s master jaws to grip the ID of the part’s central bore (not shown). An air-detect Axial Locator (3 air holes evident in its top surface) was incorporated to ensure proper seating of the part upon robot-arm placement onto the chuck.
This chuck is capable of .0001” TIR total accuracy/repeatability on all critical surfaces that interface with the part.

ID GRIPPING MODEL 450

ID GRIPPING MODEL 450

Model 450 Sliding-Jaw Air Chuck (0.0001” TIR) with special ID-gripping Top Jaws and integral Axial Locator.
Our customer inspects and balances torque converters and other driveline parts. They requested a chuck that can expand to grip the ID of their female splined shafts while it rotates on their balancing machine. Previously, they used a “homemade” fixture that had a slip-fit without the expanding capability to grip the ID of the part.
This chucking arrangement solved their problem, providing a reliable and repeatable method for them to grip their parts while accommodating the part’s tolerance variations.

EXTENDED STROKE CHUCK

EXTENDED STROKE CHUCK

Model NF-425 extended stroke chuck, modified with custom top tooling. The jaws not only clamp the work piece, but also orient prior to customers grinding procedure.
The jaws are strategically machined to allow for side loading and timing of work piece. The jaws will clamp the stem of the customer’s part and allow plenty of clearance to finish grind the OD of the work piece.

MODEL 870 SLIDING AIR CHUCK

MODEL 870 SLIDING AIR CHUCK

This air-actuated chuck has two moving jaws for gripping square or rectangular parts.
In this custom application, our customer requested Vee-Block type jaws to accommodate a range of drill sizes with each set of Insert Pads. The drill tip (not shown) stops on the axial locator (mounted to the face of the chuck), and the Insert Pads (mounted in their subjaws) clamp down on the OD of each drill while they grind its shank.
The Insert Pad and Subjaw arrangement allow for quick changeover from size to size.

MODEL 670 2-JAW SLIDING-JAW AIR CHUCK

MODEL 670 2-JAW SLIDING-JAW AIR CHUCK

Model 670, 2-jaw, Sliding-Jaw Air Chuck (0.0001” TIR) with special Top Tooling. Our customer needed to grip the OD of a molded plastic part and have access on all 4 sides for machining in 2 setups, rotary and stationary.

Specially-contoured Top Jaws along with a shuttle pin for location (not shown) were created and mounted to our standard chuck to achieve this.

650W SLIDING-JAW AIR CHUCK

650W SLIDING-JAW AIR CHUCK

Shown here is a Northfield Precision Model 650W Sliding-Jaw Air Chuck (0.0001” TIR) with custom top tooling.
This chuck has an air-detect function, shown as 3 small holes exiting through the top of the Axial Locator mounted to the chuck face. It is used to ensure proper seating of the customer’s parts.
This application is used to hold pistons (not shown) crown-side-down for machining of the opposite side.
This chucking setup is capable of .0001” TIR total accuracy/repeatability on all critical surfaces that interface with the part.

PROVIDING A CUSTOMER A SURE GRIP

PROVIDING A CUSTOMER A SURE GRIP

This is our Northfield Model 1000 Sliding-Jaw Air Chuck (0.0001” TIR) with special Top Tooling and Axial Locator. Our customer is a gauging company that needed to grip a small area of a large casting so they can check O.D. run-out of their part. Special, tall top-jaws are diamond-coated for a secure grip on the casting. We used an Axial Locator with button pads as a resting surface for the part’s flange while swallowing the rest of the part.

MODEL 650

MODEL 650

This is a standard Model 650 (.0001” T. I. R.) air chuck with custom flex jaws. The jaws flex to compensate for the out-of-round workpiece.

MODEL 350

MODEL 350

This is a standard model 350 (.0001 T.I.R.) gripping a gun part. This part is located on the outer face of the Offset tab. Therefore the part is loaded into the jaws, compressing the spring ejector. Then the cross-slide of the lathe moves into position and the chuck opens, pushing the part against a hard stop. The chuck re-clamps,
and the part is hard-turned.

HIGH SPEED BALANCING CHUCK

HIGH SPEED BALANCING CHUCK

This fixture locates a universal joint using built- in V-Blocks and (2) diaphragm jaws. The jaws and blocks center the workpiece while 2 arms slide down to face clamp.

QUICK CHANGE AIR CHUCKS

QUICK CHANGE AIR CHUCKS

Features Include:
- Fast changeover chucks for reduced set- up time.
- No reboring jaws.
- Standards from 3" to 18"
- Custom specials for workholding
applications.
- Changeable Inserts

MODEL 450 AIR CHUCK

MODEL 450 AIR CHUCK

Model 450 Air Chucks (with special top tooling) mounted on a pallet, which installs on the bed of the customer’s machine. The machine’s pick-and-place arm picks up the parts after they are finished in the front (2) chucks and transfers them to the rear (2) chucks for finishing. All hosing is routed under the plate for actuation of the chuck’s jaws.

MODEL 650 3 PISTON GRIP

MODEL 650 3 PISTON GRIP

This is a model 650 tooled with special hardened and ground sub-jaws and inserts to grip (3) different hydraulic pistons. They look like head valves, but they are not. The changeable inserts grip the large diameter, which is spherical. Inserts repeat to 1/10,000 T.I.R. when removed and re-installed. A tail stock supports the opposite side. This is a turning operation.

MODEL 625 (.250 JAW TRAVEL)

MODEL 625 (.250 JAW TRAVEL)

This is a standard Model 625 (.250” Jaw travel) rotating air chuck. This customer needed the extra travel and custom cut top-jaws to clear the flange at the back end of their workpiece. The jaws are precision ground to locate and clamp the workpiece.

10-IN. DIA. FACE CLAMPING CHUCK

10-IN. DIA. FACE CLAMPING CHUCK

Special 10-inch diameter face-clamping chuck with adjustable orientating pins and center- mounted diaphragm plate to center workpiece before two contoured fingers swing into position to face-clamp aluminum pump housings for distortion-free boring at 4,000 rpm.

12-IN. DIA. QUICK CHANGE CHUCK

12-IN. DIA. QUICK CHANGE CHUCK

Northfield model 1200 air chuck with patented ultra-precision, quick-change sub-jaws. Top-jaws have a tre-panned groove that engages with the precision ground bore of the sub-jaws. As the jaws are tightened, a flexible tab expands into the tre-panned groove, pulling the jaws against the ground bore and loading the jaws in position with zero play. The result is a top-jaw/sub-jaw connection that repeats to 1/10,000.

3-IN. DIA. CHUCK WITH OUTER RING ROTARY UNION

3-IN. DIA. CHUCK WITH OUTER RING ROTARY UNION

Standard Northfield model 350 with special rotary union on O.D. of chuck. Chuck is mounted to rotary table with no hole through the center for an air feed tube. Chuck is used to check shear strength of small screws.

MODEL 670 2-JAW WITH SPECIAL JAWS

MODEL 670 2-JAW WITH SPECIAL JAWS

Like many powdered metal parts, this water pump component comes out of sintering nearly complete, but still needing a few final operations. In this case, that means machining the bore and flange, cutting the threads and tapping the holes.

To hold this part, Northfield provided one of our standard Model 670 2-jaw chucks fitted with special jaws to grip the outside diameter of the part. Special orientation pins are used to locate the part for finish machining.

HIGH PRESSURE DIAPHRAGM CHUCK

HIGH PRESSURE DIAPHRAGM CHUCK

Another “High Pressure” challenge for Northfield. Allied Machine Company manufactures a line of spade drill inserts ranging in size from 3/8-inches to 4-inches in diameter. They asked Northfield to provide a workholding device that could accurately hold their drill inserts in position during the finish- grinding operation. Several factors made this a challenging assignment. The small drill inserts offered very little surface to clamp on, yet a very high clamping force was needed to hold them during the grinding operation. And, of course, repeatability was essential. A Z-axis clearance problem caused by the grinding wheel added another problem. And, as if that wasn’t enough, our design had to be able to function reliably in an abusive environment, filled with grinding grit.

After much thought, Northfield’s engineering department came up with a solution to Allied’s “High Pressure” challenge. We supplied a special 7-inch diaphragm chuck with two jaws made of air-hardening too-steel (60-63 HrC) that delivers up to 2,500 pounds of clamping force to the drill insert. The entire operation is repeatable to within 1/10,000th of an inch. The chuck is less than 2-inches high. This low profile, combined with the extended cone- shaped jaws, solved the grinding wheel clearance problem. And finally, because it is a diaphragm chuck, it is completely sealed and has no metal-to-metal moving parts – a perfect solution for the grit-filled environment of the grinding room.

MODEL 650-SWIVEL JAW CHUCK

MODEL 650-SWIVEL JAW CHUCK

Model 650 standard chuck with face- mounted Axial Locators and special swivel jaws to compensate for out-of-round parts (clutch stampings). Chuck grips a thin-walled stamped diameter for boring a bearing diameter that must be round within 2/10,000 of an inch.

MODEL 700 – 4140 TOP JAWS

MODEL 700 – 4140 TOP JAWS

Chucks are modified for spring clamp, air open. Special hardened and ground 4140 top-jaws grip O.D. of drive shaft slip yokes. Jaws have excess material milled away to reduce centrifugal forces. A special hardened and ground alloy steel spline driver is mounted to chuck face for easy loading and driving of shaft as it spins to 3,500 RPM for balancing.
• T.I.R. = 1/10,000.
• Cycle time 60 sec.

3"-18" DIAMMETER PRECISION AIR CHUCKS

3"-18" DIAMMETER PRECISION AIR CHUCKS

Features:

- Standard Air Chucks from 3" - 18" diameter
- Featuring Self Contained Actuator
- High Speed Functionality
- Standard Jaws in Stock

MODEL 1000

MODEL 1000

Chuck is converted to spring clamp, air open. Springs are adjustable to give 6 different jaw force settings. Chuck has hardened and ground faceplate with coolant grooves to flush away dirt and chips. Sub-jaws hold special pull down inserts to pull workpiece into face or zero axial location. Chucks mount on pallets as workpieces are machined at different stations. At end of cycle air opens chuck for parts loader.
• T.I.R. = 1/10,000.
• Axial = 0.

MODEL 450 WHS

MODEL 450 WHS

Jaws and axial stop are air-hardening tool steel, (A-2) heat-treated to 58/63 Rockwell “C”. Customer bores drill chuck outer ring at 5,000 RPM.
• T.I.R. = 1/10,000.

MODEL BIG RED

MODEL BIG RED

No, we’re not making a fashion statement for chucks here! At Northfield, we affectionately refer to the aluminum anodized chuck as “BIG RED” (it’s anodized red).

MODEL 620 CB

MODEL 620 CB

Model 620 CB with precision MT-5 adapter. Parts are diesel fuel injection nozzles for O.D. profile grind on Tschudin Angle head grinder. Chuck has sub-jaws, pull down inserts and carbide ball-nose shafts mounted on No.15 taper sleeves. Carbide shafts run concentric to 1/10,000 T.I.R. Inserts repeat to 1/10,000 T.I.R. Inserts grip nozzle, center the base and pull the nozzle seat onto the carbide ball-nose shaft.

MODEL 450W

MODEL 450W

Special jaws made of air hardening tool steel (A-2) 58-63 Rockwell “C” with brazed carbide inserts. Chuck grips 1/8-inch shank carbide Micro drills, RTW grinds flutes to diameters down to .002 inches. Drills are for circuit board drilling. Stack 3 boards drill 3 holes per second at 100,000 RPM.
• T.I.R. = 1/10,000.


MODEL 620 CB

MODEL 620 CB

Model 620 CB with precision MT-5 adapter. Parts are diesel fuel injection nozzles for O.D. profile grind on Tschudin Angle head grinder. Chuck has sub-jaws, pull down inserts & carbide ball nose shafts mounted on No. 15 taper sleeves. Carbide shafts run concentric to 1/10,000 T.I.R. Inserts repeat to 1/10,000 T.I.R. Inserts grip nozzle, center the base and pull the nozzle seat onto the carbide ball nose shaft.

MODEL 450 CHUCKS

MODEL 450 CHUCKS

Special jaws made of air hardening tool steel (A-2) 58-63 Rockwell “C” with braze carbide inserts. Chuck grips 1/8-inch shank carbide Micro drills, RTW grinds flutes to diameters down to .002 inches. Drills are for circuit board drilling. Stack 3 boards drill 3 holes per second at 100,000 RPM.
• T.I.R. = 1/10,000

MODEL 670, 2-JAW CHUCK

MODEL 670, 2-JAW CHUCK

The part has two shafts to be ground that are offset. (One is face down in the jaws.) Shafts are oriented with a spring-loaded wedge to center the tail while the off- center bore of the jaws grips the shaft. Exposed shaft is on center. After shaft is ground, flip part over to grind 2nd shaft.
• Center-to-center repeatability 2/10,000.

MODEL 425 WITH SPECIAL FLOW CONTROL, SUB-JAWS AND INSERTS

MODEL 425 WITH SPECIAL FLOW CONTROL, SUB-JAWS AND INSERTS

Monogram Aerospace manufactures highly sophisticated fasteners. If you have ever flown in a commercial airliner, you have probably seen Monogram fasteners dotting the wings of the plane. Monogram asked Northfield to develop a chuck to hold these fasteners during machining (hard turning and tapping). To accomplish this we had to address several challenges:
• The large size of the fastener head that our chuck jaws would have to grip over.
• Two head styles – flat-head and button-head – each having their own specific datum for axial banking.
• Monogram manufactures fasteners in hundreds of different sizes. This meant that our chuck would have to allow quick change from one set-up to the next.

For the flat-head style fasteners, the chuck jaws open wide enough to clear the head of the fastener. The part is pushed into the chuck to the stop. The jaws close and the part is ready to be machined. A special stop allows a continuous chip to exit from the side.

The button-head style fastener goes all the way into the chuck, as usual. The jaws begin to close in sequence with a pusher piston mounted on the face of the chuck, forcing the part up against the back of the jaws. The pusher is adjusted with a built-in flow-control valve. This method allows for greater accuracy than had been possible before.

To accommodate the variety of sizes, the chuck uses a sub-jaw/insert set-up that allows Monogram to change from size to size by removing three screws and three inserts.

Using our chuck, Monogram is able to run their machines twenty-four hours a day, seven days a week. Cycle times are measured in seconds and repeatability is to within 0.0001 inch.

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