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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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Getting to the ‘Heart’ of the Problem

Brief:

A Biomedical engineering customer set Northfield the following brief. To create chucks to hold heart valves, after coating, to finish grind. They were required to have multiple small internal grip collets and stops to allow fast tooling change over.

Challenge:

The small collet sizes and stop pads made this job unique. We were asked to hold the internal diameter of small multiple sized parts for a finish grinding operation. The internal diameters ranged from .305in (8mm) – .575in (14mm). We were also asked to locate datum that was inside the part on a small banking area.

The varying expansion range of the collet was an additional challenge. The customer part had a coating on it for which there was no set thickness. To solve this, we worked with the customers tolerance range and allowed the collets to expand approximately .040in (1mm) in diameter to allow for this coating variance.

Solution:

Three things were key:

  1. Accuracy
  2. Repeatability
  3. Quick change over times

Our customer has many different part sizes and they wanted minimal down time when switching to a new setup. They could not be happier with the setup and are thrilled with how the project continues to produce accurate parts.

Do you have a unique working holding requirement? Then get in touch now. Our sales team are always available to answer your questions. https://www.northfield.com/contact/

About:

 

Northfield Precision Instrument Corp.: Northfield is a custom workholding solutions company based in Island Park, New York. Founded in 1952, Northfield designs and produces the most accurate custom chucks in the world, guaranteed from 0.0001″ (2.5µ) – 0.000010″ (0.25µ). Northfield supplies a global customer base across, automotive, aerospace and medical industries.

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