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Finding the Right Balance

Northfield & Balancing 

We are the world’s premier manufacturer of ultra-precision balance work holding, with chucks weighing less than half of the competition. We are the only supplier recommended by major balance manufacturers. 

Our mission, is to provide manufacturing companies with the most accurate work holding solutions in the world.

Northfield Balancing Chucks Feature: 

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

Balancing: 

When parts rotate without calibration, uneven pressure can occur and cause errors with the end-product. Firstly, within a high precision environment the smallest difference can have a huge impact on the final product. Therefore, when fine tolerances are exceeded the result can be expensive and time-consuming repairs. 

With ever increasing speeds used on rotating machinery, balancing is increasingly necessary. The trademark accuracy and repeatability of Northfield chucks allow customers to take their designs to the next level. 

 

Northfield products tackling balancing challenges: 

 

Drive Shaft C.V Joints

Drive Shaft CV Joint Balancing Chuck
Drive Shaft CV Joint Balancing Chuck

Recently we have been producing internal grip collet chucks for balancing drive shafts. They are capable of repeating to less than 0.005mm total indicator reading.

To achieve this, the collet is ground to grip the pitch diameter of splined C.V. joints of a driveshaft assembly. Secondly, the “cone” has multiple stop pads for axial location and finally, tapped holes are used to balance the chuck assembly prior to production.

 

8000 RPM Double Diaphragm Chuck 

8000rpm Diaphragm Chuck
8000rpm Diaphragm Chuck

This customer required a chuck for their balancing machines to hold drive shafts by their slip-yokes. 

Normal balancing operations are performed at approximately 900 rpm. High-performance vehicles like Stock and Formula 1 cars hit 200 mph with their drive-shafts rotating at 10,000 to 12,000 rpm. Therefore, this case required accurate holding at road conditions, 8000 rpm 

The Northfield solution consists of two separate custom diaphragm chucks built together. There are two separate sets of jaws, one mounted in front of the other. This accommodates the long, thin shape of the part. With one set of jaws gripping the front of the piece and the other gripping the rear.  

The result is accuracy of 1/10,000″ T.I.R. and repeatability to 50 millionths with extreme rigidity. 

 

Turbine Balancing 

Turbine Balancing Chuck
Turbine Balancing Chuck

This custom project used an 8” diaphragm chuck with custom top tooling for balancing aluminium turbine impellers. 

The first, locates the workpiece using strategically positioned carbide pins between the blades and custom jaws clamping outside of blades.

The second, operation locates the impeller on the finished surface using a continuous ring locator. Custom jaws clamp the outside diameter of the workpiece. This allows the customer to finish balance the impeller blades 

Summary

In summary, we offer both stock and custom solutions.

Northfield’s long-standing relationships in the balancing industry speaks volumes about the products and service offered. Get in touch today to discuss your latest product with the engineering team. 

sales@northfield.com   

516 431 1112 

https://www.northfield.com/chucks/balancing-chucks/  

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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.  

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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…

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Custom Automotive Diaphragm Chuck - Plastic Top Tooling

Northfield 3-jaw, 5” Diaphragm Chuck (DPH-500) with custom plastic top tooling
Northfield 3-jaw, 5” Diaphragm Chuck (DPH-500) with custom plastic top tooling

Customer Brief

Our customer is a heavy duty fuel pump and injector systems manufacturer. They requested a method to accurately grip their small (.098” OD) fuel injector plungers without marking them.

Challenge

Chuck close up, with part and custom stop.

The tip of their part must rest in a carbide seat, ground central to the chuck. This requires the special part stop.

Northfield Solution

Northfield 3-jaw, 5” Diaphragm Chuck (DPH-500) with custom plastic top tooling, disassembled view with part.

The jaws are made from a special, highly abrasion-resistant, engineered plastic. Designed to withstand repeated clamping with minimum wear. The bore diameter gripping the part yields an accuracy and repeatability of more than 50millionths” TIR total runout to the chuck’s center line.

Do you have a similar part? Then get in touch and see how we can help.

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Unusual shapes - Just business as usual for Northfield

Mascotech Sintered Components

Mascotech Sintered Components are the second largest powdered metal automotive parts maker in the world, and a valued Northfield Customer.

Sintering is not a new technology, but it can provide tremendous financial savings in parts processing.

  1. The process starts with metals in powdered forms. Several alloys are combined to create a new material with specific properties.
  2. Powdered metals are put into a mold then compressed, under several hundred tons of pressure, causing them to fuse.
  3. Finally, the piece is released from the mold, this is called the green state, put into an oven, and sintered.

The result is a strong, economically produced, near complete component.

In addition to doing the powdered metal work, Mascotech also performs roughing and finish machining on some of their parts. This is where Northfield comes in, supplying three unique custom solutions.

 

Transfer Case Component

For this automotive transmission component, Mascotech needs to finish the bore and cut two grooves. These hold a snap-ring and a wave spring.

The Challenge

Cutting the grooves with a forming tool develops up to 20 horsepower, meaning the part needs to be held very securely while the material is removed. However, the part has thin walls, making it difficult to grip without deforming it. Since all the machining operations will take place at the same time, maintaining roundness is critical.

Solution

We solved the problem by outfitting our standard 8″ Model 800 3-jaw chuck with custom full circle jaws that locate and grip the circumference of the part with a drive pin to pick up most of the torque.

 

Water Pump Component

Like many powdered metal parts, this water pump component comes out of sintering nearly complete, but still requires a final operation. In this case:  machining the bore, flange cutting the treads and tapping the holes.

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

 

Crankshaft Sprocket

The final project is creating a family of sprocket gears. After sintering, the material has a particle hardness of 58/63 Rockwell “c” scale. Mascotech needed to hard turn the bore.

Challenge

The main challenge is the keyway between the gear teeth.  It makes one section of the work piece very thin and introduces an interrupted cut during machining of the bore.

Solution

Our solution employs a 4″ diaphragm chuck with six jaws to grip the major diameter of the gear teeth and three pads for axial banking. One of the jaws has a drive pin to insure no slippage while holding the part very gently.

Using our chuck, Mascotech is able to achieve a roundness specification of less than 0.0002 inch when machining the bore. Mascotech utilities Northfield work holding for over 80% of their turning applications at their Ridgway, PA facility.

Northfield Precision Instrument Corp.: Northfield is a custom work holding solutions company based in Island Park, New York.