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O.D. Diaphragm Chuck

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This is a (4) jaw - 6 inch O.D. diaphragm chuck that was used to hard turn the I.D. of bearing caps. This chuck accommodated (3) different sizes of the bearing caps, where change over was as simple as removing (1) screw from each jaw. This chuck had a positive part stop with a part ejector that was used in a system with robotic load.

There was also a built in air cylinder which incorporated push-pull capabilities. The chuck was built with stir- around screws where the chuck was proven to repeat within .0001 TIR. This particular chuck was used to replace a (3) jaw sliding chuck where performance and maintenance was timely and not cost effective.

Being this chuck was used in a grinding application, the previous chucks were having to be taken off the machine and disassembled every month due to the nature of the grinding process. With the one-piece construction of the diaphragm, the chuck has currently been in use for over 1.5 years with continuous cycle times of 7 seconds.

Custom Diaphragm Chucks · Diaphragm Chuck Capabilities · Competetive Advantages & Strengths

Custom Diaphragm Chucks

Ideal for high precision turning, grinding, milling, boring, hard turning, inspection

One piece construction allows for clamping on O.D., I.D., or pitch-line, thin-walled parts: No metal-on-metal moving parts, causing no wear for long-life

Ensures flexibility to engineers or tool designers

Will mount in existing machine envelope (jaw height, locator, and jaw inserts identical)

3, 4 or 6 jaw designs available

Uniform, variable clamping forces provide a rigid design without part distortion

Diaphragm Chuck Capabilities

Sealed Design		• One piece construction eliminates contaminants and costly down time • Maintenance free, no lubrication required

Pull-Down		Pulls work piece tight against part stop

Versatility		• Quick change jaws allows for quick turnover • No grinding necessary on replacement jaws – part turnover within minutes, not hours • Accommodates different sizes using a single diaphragm

Actuation		• Air actuation or push-pull clamping • Uniform clamping pressures

TIR		• Repeatability of less than .0002 • Quick change jaws do not affect TIR

Competetive Advantages & Strengths

Long term ownership (33 years)
(3) graduate engineers: Multiple employees with each having 25+ years dedication to Skill-Craft
Knowledgeable with both Skill-Craft and non Skill-Craft workholding products: Continuous improvement achieved by transferring this knowledge to own custom designs
Repair both Skill-Craft and non Skill-Craft chucks to achieve like new accuracy
Excel in back engineering when no prints are available
High Powered Expertise/Low Cost Business Structure
Latest Automated Design and Manufacturing Technology (CAD, FEA, CAM, CNC)
Precision/stability/repeatability (20-50 millionths) at high speeds >5000 RPM’s
Collets manufactured to a tolerance of .0001 inch
World class reliability and maintainability
AAA credit rating

O.D. Diaphragm Chuck

Sealed Design

Pull-Down

Versatility

Actuation

TIR