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Custom Full Wrap Jaws

Custom clamping jaws, developed for a vertical machining environment. A Northfield 650 air chuck has been adapted to work with custom jaws.

FullWrap_Jaws_Clamping_Air_Chuck

The ‘pie’ shaped top jaws provide a full wrap clamping around the work piece. This project also includes a custom spring loaded locating pin assembly. Designed to orient the customer’s workpiece allowing fast and accurate change over.

Can we do the same for you? Reach out and an engineer will be in touch to collaborate on your next project.

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Plastic Tooling - Ceramic Grinding

Brief & Challenge:

Our customer manufactures delicate ceramic rings. They needed a way to carefully hold them on the outer diameter so they could grind the inner diameter. In order to protect the parts, they requested the chuck had no metal contact points.

Ceramic_workholding_Grinding_Chuck

Solution:

We produced a 6” Diaphragm Chuck with non-metallic top tooling in contact with the customer’s part. The top tooling, made from the most abrasion-resistant plastic available can be quickly changed, for new ones, should a future need arise.

Northfield Precision Instrument Corporation is a leader in developing custom solutions for difficult work holding problems. Click here to get in touch.

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Northfield Pressure-LokTM Chucking System

Our recent product introduction, the Northfield Pressure-Lok TM Chucking System is an air chucking system that works without the air tubes and hoses. Video Below ⬇.

Northfield Pressure Lok Chuck
Northfield Pressure Lok Chuck

The Pressure-LokTM air chuck once charged with air pressure can hold pressure for up-to 3 weeks! Ideally implemented in machining operations that do not have access to a continuous supply of air.

The quick connect fitting is compatible with all Northfield chucks. The air pressure can be altered between 5 & 80 P.S.I. to adjust the grip force as required, improving the flexibility offered by spring clamping alone.

Northfield Pressure Lok Chuck
Our model 450 (3-Jaw) Air chuck with .0001 T.I.R.

Email sales@northfield.com to learn more.

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Custom Diaphragm Chuck for milling precision gears

Every week exciting new projects are heading out the door, such as this Custom Diaphragm Chuck for milling precision gears.

Brief:

The customers work piece is a small precision gear that requires milling on one face, timed to existing geometry.

Challenge:

The outer diameter of this gear shouldn’t be touched, gripping is only possible on the root diameter.

Solution:

Northfield DPH-400 (.00050” T.I.R.) 4” diameter diaphragm chuck was provided, with sub jaws, changeable inserts and stops for different sized work pieces.

  •  Wire cut inserts clear the major diameter and clamp on the root diameter.
  • Changeable stop pads have timing pins, to orient the work pieces prior to clamping.
  • The base stop has a ground indicating band for initial setup.
  • The chuck’s ‘pull-back clamping’ action ensures the part sits flat.

 

Don’t forget you can also follow our most recent projects on LinkedIn.

 

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/

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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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Medical Precision and Customization

Medical Engineering

Always looking for a chance to innovate, the Northfield team were excited to bring their years of work holding expertise to the medical industry, creating parts for joint replacement.

Brief:

Deliver the appropriate tolerances requested, including: concentricity, accuracy, and repeatability from part to part. Achieving
this was the priority whilst allowing easy operation and quick tooling change overs.

The Northfield team created two separate solutions:

Custom_Collet_Chuck

  • Secondly, a ‘Power Block’ for holding multiple knee-joints simultaneously with a very specific grip force. Also, allowing clearance for the milling tools and part sensing ports. This allows the machine to acknowledge that parts are correctly loaded and ready to be manufactured.

custom_air_chucks

Challenge:

1. Holding the half sphere shoulder parts from the inside with only a minimal surface area, to allow the finishing operation on the outside.

2. The knee joints required custom air chucks to clamp various part sizes at the same time for finish milling.

3. Ensure the correct jaw force was applied to the delicate parts throughout the entire process.

Solution:

1. Northfield offers a large range of standard precision collet chucks, that grip a part internally. This job was unique as we developed a special contoured collet with a specific shape. Finish milled to enable holding several different part sizes. We also added a locating surface that uniquely has a small surface area, although robust and accurate enough to allow a long tooling lifetime.

2. Four different sized parts need to be held at the same time, therefore multiple Northfield chucks are in use simultaneously. Our customer wanted to finish the second operation of all the parts at once, achieved by creating a base plate with easy air porting.

3. Finally, we also delivered a force analyser that works together with our custom tooling, creating a turn-key solution with specific grip force.

 

Do you have a special working holding requirement? Our sales team are always available to answer your questions. https://www.northfield.com/contact/

 

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