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Vertical Workholding - Welding Torque Shells

Our customer welds torque converter shells.

Brief

The requirement is for a chuck to hold torque converter hubs while rotating them in a welding machine.

The challenge

is providing a completely sealed chuck to avoid damage from excess material and additionally one that can be vertically mounted whilst maintaining constant grip during the process.

Sealed Northfield Collet Chuck with Custom Top Tooling
Sealed Northfield Collet Chuck with Custom Top Tooling

To solve this

we customized a collet chuck by adding unique top tooling. As the chuck’s inner diameter collet expands, it also acts to pull the part down and onto the outer flange. This additionally serves repeatable locating onto the datum surface.

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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.  

Custom Air Collet 1
Custom Air Driven Northfield Collet Set-up
Custom Air Collet
Northfield 16c Collet Chuck
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Custom Collets – Air vs. Hydraulic

 

Collaborating with the finest in machine tool productivity innovation.  

Brief: 

The task is tooling up a standard dual head rotary table to accommodate the bolt carrier.

Challenge:

The challenge of this job is to provide a work holding solution, allowing actuation of the work holding on the customers table.  

Custom Air Collet 1
Custom Air Driven Northfield Collet Chucks
Custom Air Collet
Northfield 16C Collet Chuck

Northfield Solution: 

The Northfield 16C collet chucks are air driven units as standard. Pairing these with an adapter plate and air tube allows actuation on the customers rotary table. Additionally, these chucks allow the usage of standard 16C collets. 

Air vs Hydraulic: 

These chucks are also available in a hydraulic format. This same setup has been supplied to other manufactures with a hydraulic configuration. Providing a greater grip force than our air driven units. This is useful when heavy milling or turning operations require a higher grip force capacity and the material being held supports such a setup.  

Sound useful? Then reach out – TOLL FREE: (800) 810-2482

Contact Northfield – Northfield

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Lathe Finish Turning

Our customer is an OEM manufacturer of welding equipment.

Brief

The work holding requirement is for a lathe. Our customer needs a chuck that expands to grip the inner diameter of welding shield caps so they can finish-turn its rough outer shape.

Northfield Solution

A Highly-Specialized, 4.500” Diameter Northfield Collet Chuck
A Highly-Specialized, 4.500” Diameter Northfield Collet Chuck

Shown here is a highly-specialized, 4.500” diameter, Northfield Collet Chuck with custom top tooling mounted.

As the chuck’s internal diameter collet expands, it also acts to pull the part down and onto its outer banking surface shown in the photo at the right. This insures repeatable location onto the datum surface, saving time and reducing error.

This is just one of many examples of our work across a variety of industries and machining situations. Do you have a project that requires a custom solution? Then get in touch with our team and chat with a Northfield engineer to see how we can help solve your problem. Contact Northfield – Northfield or call – Phone: (516) 431-1112.

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Internally Gripping - Automotive Drilling

Custom automotive drilling work holding A drilling solution custom designed for the automotive industry. Based on hydraulically actuated, internal grip collet chucks.

Eight of these chucks mount on a pallet in a vertical machining centre, gripping automotive parts for drilling. The chucks are 76mm in diameter but deliver up to 544 kg. of draw force.

Custom automotive drilling work holding

Northfield Collet Chucks repeat to 1/10,000 T.I.R and pull the part onto the centre hard stop.

Does this sound like something that you would be interested in? Get in touch to discuss your next project with Northfield.

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Internal Spline C.V. Chucks

Recently at Northfield we produced a custom internal grip collet chuck for balancing drive shafts.

Custom_Internal_Grip_Collet_Chuck

 

 

 

The collet on this chuck grips the pitch diameter of splined C.V. joints of a driveshaft assembly.

 

 

 

Internal_Grip_Collet_Chuck_Disassembled

 

 

  • The ‘cone’ has multiple stop pads for axial location.
  • Tapped holes balance the chuck assembly prior to production.
  • The chuck repeats to less than 0.005mm total indicator reading (T.I.R.).

 

Northfield is the world’s premier manufacturer of ultra-precision balance chucks for prop shafts, with chucks that weigh less than half of our competitors. We are also the only chuck supplier recommended by major balance manufacturers.

Northfield Balancing Chucks Feature

  • Highest accuracy
  • Highest RPM
  • Shortest hung mass
  • Fastest & most accurate change over

Interested to know more? Reach out…