Skill-Craft Company Inc.
Serving the Workholding Industry Since 1952

Custom Designed Workholding Chucks from Skill-Craft Company Inc.

Custom Designed Chucks
Custom Designed Chucks

We custom design workholding solutions to fully address the parts features and workholding application. Some companies create "custom" chucks by altering a standard item to "make it work"; Skill-Craft takes a systematic approach to design a chuck custom to you - custom to your application and custom to your part.

Whether you are replacing an existing chuck or having troubles with a current application, Skill-Craft engineers can provide you with the appropriate solution to your needs.

Custom Designed Workholding Chuck Examples

6″ O.D. Diaphragm Chuck
6″ O.D. Diaphragm Chuck
6″ O.D. Diaphragm Chuck

This is a (4) jaw - 6″ 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.

12″ O.D. Diaphragm Chuck
12″ O.D. Diaphragm Chuck
12″ O.D. Diaphragm Chuck

This chuck is a 12″ O.D. diaphragm chuck with 9 ears.

There is no grinding of the jaws at part change over and the chuck still repeats within .0002 tir.

9″ I.D. Diaphragm Chuck
9″ I.D. Diaphragm Chuck
9″ I.D. Diaphragm Chuck

This chuck is a 9″, 6-jaw I.D. diaphragm chuck. Our customer needed a way to perform an audit on their production ring gears they were machining. This chuck was used and developed to hold on the I.D. of the ring gear so various dimensions could be checked.

This chuck had to repeat within .0002 in order to assure proper readings from the audit machine. There were (2) different sized ring gears, so all that was necessary for part change over was replacing the (6) top jaws that has (2) bolts per jaw to hold it in place. Even with part change over, the chuck repeated within .0002.

Custom Wheel Chuck
Custom Wheel Chuck
Custom Wheel Chuck

This chuck was designed to balance various sized wheels. We had to have .4 inches per side travel along with a chuck to hold 3 different sizes.

Single & Double Tapered Collet Chucks
Single & Double Tapered Collet Chucks
Single & Double Tapered Collet Chucks

This chuck was designed for ease of part change over. There are (2) different parts being held and our customer needed a quick way for part change over. There are (6) part stop posts that are stationary.

The left picture shows the chuck while it had the long double taper collet configuration. Change over was as easy as replacing the gold body with the one on the right in order to hold the second part. The chuck had a built in air cylinder with springs to clamp the part. The chuck repeated within .0002.

3-Jaw Draw-Down Chuck
3-Jaw Draw-Down Chuck
3-Jaw Draw-Down Chuck

This chuck is a 8″, 3-jaw draw-down chuck. Our customer needed a way to ensure part was being held tight against the part stop during machining. Our customer was machining a gear carrier where repeatability had to be less than .0005.

We proposed this design to replace their current 3-jaw sliding chuck that was not performing to their needs. This chuck was fit into the old machine envelope with exact part stop heights and exact chuck diameter and weight specifications.

18″ 2 Collet Chuck
18″ 2 Collet Chuck
18″ 2 Collet Chuck

This chuck was designed with (2) independent collets. There is a smaller collet on the inside that locates and clamps a small internal bore on the piece first before the large collet clamps the piece for turning.

This chuck is 18 inches in diameter as well as having concentricity of .0005".

12" Jaw Wedge Key Chuck
12″ Jaw Wedge Key Chuck
12" Jaw Wedge Key Chuck

This chuck was a 12 inch (12) jaw wedge key chuck that was used to hold (3) different sizes of tires. The biggest benefit this chuck has is the ability to chuck different sizes of bores varying .5 of an inch. With exact repeatability of each jaw on the internal wedge, the chuck repeated less than .0001.

Troubleshooting & Engineering Assurance

Troubleshooting
Skill-Craft specializes in problem solving with over half a century of knowledge in workholding applications. Let Skill-Craft's engineers provide you with a solution if you are having trouble with:
  • Constant maintenance of current chuck
  • Out of round finished products
  • High scrap rates
  • Non-conforming production parts
  • Chatter while machining
  • Long change over times
  • Poorly manufactured replacement tooling
  • Long lead times for chuck assemblies or other perishable items
Engineering Assurance
  • Skill-Craft has the latest CAD and CAE tools available.
  • CAD and CAE software's are an integral part to developing the best chuck for your application. This ensures you before the build that you will receive the safest, longest lasting chuck or workholding device available.
  • We determine jaw force, stress/strains due to loading, resultant jaw forces due to centrifugal force, and resultant stresses during machining, prior to build.
  • Let Skill-Craft provide you with a concept today!
Custom Chucks
We custom design workholding solutions to fully address the parts features and workholding application. Some companies create "custom" chucks by altering a standard item to "make it work"; Skill-Craft takes a systematic approach to design a chuck custom to you - custom to your application and custom to your part.

Whether you are replacing an existing chuck or having troubles with a current application, Skill-Craft engineers can provide you with the appropriate solution to your needs.

Competitive 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
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