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Off-center Bores, Taking Center Stage.

Brief 

A precision manufacturer of aeronautic and aviation components needs to turn a bore that is off-center from the outer diameter of their part. 

The Challenge  

This operation needs to be performed on four different part sizes using the same chuck, whilst maintaining the tolerance to the existing ground ‘Datum’ on the part’s face. 

Solution 

Custom_Northfield_470W_Chuck
Custom Northfield 470W Chuck

Custom Northfield Precision Model 470WHS Sliding-Jaw Air Chuck (0.0001” TIR) with custom offset top tooling. 

The customer has four different offset parts that all need to be held with the same chuck. To accomplish the brief, we created four sets of quick-change stops and inserts. The different sets of inserts mount to hardened and ground sub jaws. This design offers accuracy and repeatability alongside quick change over times.

Custom ground sub jaw set
Custom ground jaw set

The hardened insert’s bores are ground off-center to compensate for the parts offset feature. The stops have quick change tapers to center the tooling during change overs. Within these changeable stops we also ‘time’ the part using locating pins. This ensures the proper offset orientation of the part.  

Additionally, the Model 470W chuck’s rotary union has 3 passages. One of these drives an air-driven ejector within the stop. This pushes the part out, against a separate stop component, to establish the accurate datum location.  

Custom Northfield 470W without Part
Custom Northfield 470W without Part
Custom Northfield 470W with Part
Custom Northfield 470W with Part

 

 

 

 

 

 

 

 

 

Do you have a tricky part to machine? Contact us to see how we can help.  

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Skim Cutting Titanium

Our customer builds and supplies complete machine tooling solutions. They are working with the Northfield engineers to develop a skim cutting solution for multiple sized parts.

Brief & Challenge 

The workpieces are a range of titanium parts that require skim cutting, some need to be held by the outer diameter and some on the inner diameter. The main challenge is achieving this with a single chuck.  

Solution 

Titanium_Grinding_Custom_Tooling
Northfield Precision Model 650 Sliding-Jaw Air Chuck

To meet this challenge, we provided a Northfield Precision Model 650 Sliding-Jaw Air Chuck (0.0001” TIR) with interchangeable and custom top tooling. 

The jaws are Rockwell 60 tested therefore allowing for future regrinds and as a result increasing the jaws longevity.

This chucking setup is capable of .0001” TIR total accuracy and repeatability on all critical surfaces, those which touch the parts. 

Give the engineering team a call to discuss any work holding challenges you have and learn how Northfield can support you. Phone: +1 (516) 431-1112 

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The Top Brass – Custom Brass Top Tooling

Brief

A CNC and process automation customer required custom work holding solution for Grinding the outer diameter of their unique sapphire rods.  

Challenge

The main challenge for the Northfield team is holding the rods well enough without damaging them or creating micro fractures in the material. Additionally, delivering the trademark repeatability and accuracy. 

Custom Workholding Total Indicator Reading
Brass Work Holding – Total Indicator Reading

Solution

The work holding solution is a Northfield model DPH-400, with custom Brass Work Holding Jaws. The top tooling consists of three parts.  

  1. Hardened and ground sub jaws  
  2. A separate center button stop 
  3. Precision ground brass inserts mounted to the sub jaws 

This setup ensures accuracy and repeatability whilst grinding the outer diameter to the required size. 

Custom Brass Jaws Chuck
Custom Brass Jaws Chuck

The use of brass answers the customers need to hold their unique sapphire rod without damaging it. Brass chuck jaws prevent sliding and are very corrosion resistance, meaning there are also tough enough to operate in a grinding environment. 

 

Do you work with delicate or uncommon material? Get in touch and see how Northfield can support you. 

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Straight to the Point – Precision Drill Tip Manufacturing

Brief: 

This project is for an international metal cutting solutions provider. They required custom jaws that can hold various sized drill tips.  

The Challenge: 

The work holding jaws all need to have ‘vee-block’ type insert-pads to securely hold a variety of square parts with our trademark accuracy. 

Custom_Square_Drill_Bit_Tooling
Model 870 Sliding-Jaw Air Chuck (.0001 TIR) with custom ‘square’ top tooling.

Solution: 

Introducing our Model 870 Sliding-Jaw Air Chuck (.0001 TIR). This air-actuated chuck has two moving jaws for gripping the square or rectangular parts. 

The drill tips stop on the axial locator (mounted to the face of the chuck), and the Insert Pads (mounted in their sub jaws) clamp down on the outer diameter of each drill tip before grinding its shank. 

Extra Feature:

The Insert-Pad and Sub-Jaw design to allows for quick changeover between sizes. 

Does this sound like a familiar situation? Then give us a call (516) 431-1112 or fill out the form.

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5-Axis Machining in Two Steps

High precision custom work holding, finishing all part machining operations in only two setups. Reducing error and saving time. 

Brief:

Our Customer is a well-established high precision machine and automation provider. They required a custom solution to complete all machining operation in two steps.  

  1. Work holding on a rotary table within a 5-axis machine.  
  2. A chuck with custom hardened jaws to grip the finished side of the work piece from the first step. 

Read on to see how the Northfield engineers solved this problem… 

Custom Air Chuck 5-Axis Machining
Northfield Precision Model 450W Sliding-Jaw Air Chuck (0.0001” TIR) with custom top tooling attached.

Northfield Precision Model 450W Sliding-Jaw Air Chuck (0.0001” TIR) with special top tooling attached
Northfield Precision Model 450W Sliding-Jaw Air Chuck (0.0001” TIR) with custom top tooling attached

The first chuck is based on the 450W Sliding-Jaw Air Chuck, for mounting to a rotary table for 5 axis machining of the first portion of the final product. 

The custom top jaws are hardened and ground to size before coating with 150. Grit diamond. This ensures a good grip on the customers rough turned blank. 

Additionally,  

Northfield work holding solutions include air detect axial locators. This in this case, 3 air ports on the 3-part banking surfaces. Ensuring positive, part seat confirmation before the machining process begins. 

Step 2:

Northfield Precision Model 470W Sliding-Jaw Air Chuck (0.0001” TIR) with custom top tooling attached.
Northfield Precision Model 470W Sliding-Jaw Air Chuck (0.0001” TIR) with custom top tooling attached.

Northfield Precision Model 470W Sliding-Jaw Air Chuck (0.0001” TIR) with custom top tooling attached.
Northfield Precision Model 470W Sliding-Jaw Air Chuck (0.0001” TIR) with custom top tooling attached.

The second stage of the process involves gripping the finished side of the part from the first step without damaging, to finish the second step.  

To accomplish this, we added custom hardened and ground sub jaws to a Model 470W Sliding-Jaw Air Chuck. These hold specially Electro Discharge Machined (EDM) inserts, designed to grip the finished side of the part produced in first machining operation. Additional machine clearance was required at this stage, so the chucks are also mounted to custom Vertical base plate risers. This accommodates for the machine clearances. 

Finally, this chuck also includes a special air detect axial locator, with 1 air port on the part banking surface, for positive part seat confirmation.  

 

Are you looking for a custom work holding solution that includes a collaborative design process? Then get in touch today and discuss your projects with the Northfield engineering team.  

 

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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.