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Spring Conversion Air Chucks

Our customer develops measurement and control systems, helping manufacturers perform at their best.

Model-350THS
Northfield Model-350THS

Above is our standard Model 350THS (thru-hole, stationary) Precision Air Chuck. This model extends the functionality of our 3”, thru hole, stationary chuck by adding a spring-closing feature to it.

It has been converted to a spring-closing mechanism allowing the part to remain clamped even if line pressure is lost.

Air is supplied to one port (steel fitting), while the other (brass fitting) acts to exhaust the other side of the chuck’s piston. The part will stay gripped even if there is a loss of line pressure. Also, the part can be chucked by applying line pressure, temporarily, to open it and then removing all lines to the chuck, allowing it to be gripped by spring force.

 

Do you have a specific custom job that Northfield can help with?

This design can be mounted on a spindle without a thru-hole, or air cannot be continuously ‘fed’ to the chuck.

Contact Northfield – Northfield

 

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Custom Balancing Workholding

Our customer provides Dynamic Balancing Machines and Services. Inspecting and balancing: torque converters and rotating driveline parts up to 10,000lbs.

Brief

The request is for a chuck that can expand to grip the inner diameter of female splined shafts, while it rotates on their balancing machine.

The challenge is to improve their previous solution. They were previously using a “homemade” fixture. It had a slip-fit without the expanding capability to grip the inner diameter of the part.

Custom Northfield Model 450 Sliding-Jaw Air Chuck (0.0001” TIR)
Custom Northfield Model 450 Sliding-Jaw Air Chuck (0.0001” TIR)

Northfield Solution

Shown above is our Northfield Model 450 Sliding-Jaw Air Chuck (0.0001” TIR) with special ID-gripping Top Jaws. Additionally, an integral Axial Locator increases the speed of part change over and accurate part seating before starting the operation.

Result

This chucking arrangement solves their problem. It provides a reliable and repeatable method for them to grip their parts while accommodating the part’s tolerance variations.

 

If you have a similar custom project, reach out to our team. Contact Northfield

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High Precision Bores and Finish Grinding

Working for an international OEM supplier of the world’s most accurate precision rifle barrels. 

Brief: 

  1. Outer diameter clamping to grind bores in high precision bolt carriers for modern sport rifles.  
  2. Inner diameter clamping for finish grinding the outer diameter. 

Challenge: 

The two challenges are:

  1. Accommodating the extended part length
  2. Completing a second finish grinding step without damaging the first
Sport Rifle Bolt Carrier Grinding Group
Sport Rifle Bolt Carrier Grinding Group

Northfield Solution: 

The first operation involves grinding a bore to finish size. This bore houses the critical components that allow the firearm to function properly. 

We built a Northfield Model 620 Sliding Jaw Chuck with an extended air cylinder housing. This accommodates the long part length. The hardened and ground top jaws clamp on the rough outer diameter of the customer’s part.  

Custom Northfield 620 Air Chuck
Custom Northfield 620 Air Chuck

During loading, the part is set down on a hardened and ground axial locator, ensuring an accurate datum location each time.  

Secondly, this customer also requires work holding for finish grinding the outer diameter of the part. that they clamped on using the model 620 sliding jaw chuck in the first step.  

Custom Northfield Collet Chuck
Custom Northfield Collet Chuck

We achieved this with a custom internal grip collet chuck with a collet diameter of .5232in. This chuck clamps on the finished inner diameter while the other end is supported with a center. The operation grinds the whole outer diameter of the part, producing an accurate O.D. dimension. This ground diameter is one of the most critical dimensions required for the firearm to function reliably.  

 

Do you have a multi-step machining process that requires high precision work holding? Then get in touch.  

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Custom 4th Axis Tooling Package

Brief: 

The brief of this job is to create a custom tooling package for mounting on a 4th axis rotary table. Holding a raw aluminium extruded blank, for finish milling in a single operation. 

Challenge: 

As our work holding must not get in the way of their tooling paths. Therefore, the challenge is incorporating milling clearances within the axial locator and jaws.

Custom Northfield Model 670 set-up
Custom Northfield Model 670 set-up
Custom Northfield Model 670 0
Close-up Northfield Model 670

 

Solution: 

Our solution is a Northfield model 670, 2 Jaw Chuck with a custom set of internal grip jaws. Additionally, a custom axial locator that is finish ground and Electro Discharge Machined (EDM) allows for the required customer tooling clearances.  

The design also incorporates a timing block. This ensures correct loading of the parts each time, and that they do not spin or change orientation during the milling operations. 

Finally, the chuck is mounted to a 4th axis rotary table with a custom Northfield backported adapter plate. This allows air passageways to run though the rotary table into the rear side of our chuck for normal clamp and unclamp operations.  

Do you have a current 4th or 5th axis project? Get in touch to see how we can help – TOLL FREE: (800) 810-2482

Contact Northfield – Northfield

 

Custom Northfield Model 670 0
Close-up Northfield Model 670
Custom Northfield Model 670 set-up
Custom Northfield Model 670 set-up

 

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No need to regrind - Long Lasting Custom Jaws

Our customer is a precision manufacturer of engine and fuel injection systems. 

The Challenge 

is to solve the problem of extreme wear on the grip area on the jaws. Northfield Chucks can be customized with a variety of top tooling options. Here is one of our standard 4” sliding-jaw chucks (Northfield Model 450). Especially modified for our customer.  

Custom Carbide Chuck Jaws
Custom Carbide Chuck Jaws

Solution

To solve this, we developed a custom set of jaws containing brazed carbide for the grip lands of the jaws. The result, the jaws last approximately 3 times as long, before requiring a regrind.  

Could this kind of modification to a standard work holding chuck help you solve a problem?  

Then get in touch with the team.  

Contact Northfield – Northfield 

Or call: (516) 431-1112 

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Autonomous Automotive Inspection Workholding

This project is for a longstanding customer who produces: precision machines, tools, and rotary tables. The brief requires gripping the inner diameters of continuously variable transmission (CVT) sheaves for runout inspection.  

The Challenge 

The work holding challenge is to create a chuck for auto-loading in an autonomous machining environment. We are their preferred supplier for custom and high precision projects and therefore need to deliver our trademark accuracy and repeatability. 

Solution: How did we deliver? 

Positioning the part by robotic arm requires every custom feature ensures proper seating before the machining operation begins.

Runout_Inspection_Chuck_Drawing_Northfield_Proprietary
Runout Inspection Chuck Drawing – Northfield Proprietary
Runout_Inspection_Chuck_Northfield_Proprietary
Custom Northfield Precision Model 625 Sliding-Jaw Air Chuck (0.0001” TIR) with special top tooling
  1. The custom top-jaws are permanently mounted onto the chuck’s master-jaws. This grips the inner diameter of the sheave’s central bore. 
  2. The 3 air holes in the top surface of each custom jaw are an air-detect Axial Locator.
  3. The jaws are also ground at mid-stroke of the chuck, providing a large part-load clearance.

Finally, analysing all critical surfaces that interface with the part, this work holding chuck delivers the trademark Northfield accuracy of of .0001” TIR and repeatability. 

Our innovation and relationship building is what sets us apart from the competition. Do you have a high precision challenge? Contact us to see how the Northfield team can solve it.