(323) 582-7348
Monday, June 17, 2013
| Established in 1952 (323) 582-7348 |
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Page: 4590 Monday, June 17, 2013 |
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The complete cylinder is a low cost, high quality component widely used in kinematic applications. Two parallel mounted cylinders form a very high quality substitute for the hard-to-manufacture vee groove. These hardened and dimensionally stabilized stainless steel cylinders are precision ground and machine lapped to provide excellent cylindricity with close dimensional tolerance. |
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The highly uniform low microinch surface texture generated by the machine lapping leads to low hysteresis and excellent repeatability. These complete cylinders can be press fit, shrink fit or glued into mating holes. They can also be clamped in place by a number of different methods. The surface finish is 1 microinch Ra maximum (.0000254 mm). The cylindricity of all cylinders is .000020" (.000508 mm). |
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| Part No. | Quantity 1 | Quantity 4 | Quantity 11 | Quantity 50+ | Purchase |
| 187-C | $7.50 | $6.20 | $5.96 | $5.70 |  |
| 250-C | $7.50 | $6.25 | $5.95 | $5.75 | |
| 312-C | $7.50 | $6.45 | $6.00 | $5.85 | |
| 375-C | $7.50 | $6.45 | $6.15 | $5.95 | |
| 500-C | $7.60 | $7.20 | $7.00 | $6.60 | |
| 625-C | $8.76 | $7.60 | $7.38 | $6.76 | |
| 750-B | $9.95 | $8.00 | $7.75 | $6.95 | |
| 100-B | $12.55 | $10.10 | $9.90 | $9.12 | |
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| Part No. | Quantity 1 | Quantity 4 | Quantity 11 | Quantity 50+ | Purchase |
| 187-TC | $13.25 | $12.95 | $11.75 | $11.55 | |
| 250-TC | $13.25 | $12.95 | $11.75 | $11.55 | |
| 312-TC | $13.70 | $12.40 | $12.25 | $12.05 | |
| 375-TC | $14.45 | $14.15 | $12.95 | $12.75 | |
| 500-TC | $15.95 | $15.50 | $14.10 | $14.00 | |
| 625-TC | $20.33 | $19.80 | $18.55 | $17.50 | |
| 750-TC | $24.70 | $24.10 | $23.00 | $21.00 | |
| 100-TC | $29.60 | $29.00 | $27.00 | $25.00 | |
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The truncated and recessed cylinder is used where reduced profile height and or increased mechanical stability provided by the flat rim are required. This design has a .005" deep recess on its flat surface that is made very rough by Electrical Discharge Machining. This rough surface is used in applications where the cylinder is glued in place. These hardened and dimensionally stabilized stainless steel cylinders are precision ground and machine lapped to provide excellent cylindricity with close dimensional tolerance. The highly uniform low microinch surface texture generated by the machine lapping leads to low hysteresis and excellent repeatability. Two parallel mounted cylinders form a very high quality substitute for the hard-to-manufacture vee groove. The truncated and recessed cylinder is usually clamped, glued, or clamped and glued into position. |
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Truncated and Recessed Cylinder Pricing
Threaded CylinderMade from Hardened Stainless Steel with Tapped Holes Because the cylinder is held from behind with machine screws, there is no interruption of the cylindrical surface. This provides a smooth, clean working surface. These hardened and dimensionally stable stainless steel cylinders are precision ground and machine lapped to provide excellent cylindricity with close dimensional tolerance. The highly regular, low micro inch surface texture generated by the machine lapping leads to low hysteresis and excellent repeatability. Two parallel mounted cylinders, held in place by machine screws form a very high quality substitute for the hard-to-manufacture vee groove.
Threaded Cylinder Prices
Truncated and Threaded CylinderMade from Hardened Stainless Steel with extended glue line and tapped holes
Truncated and Threaded Cylinder Pricing
Truncated Cylinder with Counterbored HolesMade from Hardened Stainless Steel with an Extended Glue Line
Truncated Cylinder with Counterbored Holes Pricing
The Kinematic Quarter Round
By simply burying these enhanced kinematic elements in self supporting trenches that are machined into platform proper, the rigidity and the resonate frequency of the platform can be raised by orders of magnitude. The Quarter RoundA high quality Vee Block is one of the most difficult pieces of kinematic hardware to produce. For this reason, two parallel cylinders have become a popular Ultimate Round for the flat angled facets of a Vee Block. Although very high quality cylinders are easy to produce, it is difficult to rigidly attach them to the Kinematic Platform. Cylinders of large diameter have a high profile, are heavy, and quite expensive By splitting a precision lapped cylinder of rather large diameter into quarters, we produce components that can be rigidly glued into a simple slot or trench machined into the Kinematic Platform. The Ultimate Quarter RoundThe "Ultimate Quarter Round" is the zenith of perfection in kinematic components. When used in combination with grade 2.5 quality tungsten carbide spheres, these components will challenge present capability of error evaluation. When used in a well-designed kinematic system, the error budget will be measured in nanometers and microradians. How is this extraordinary performance achieved? We start with the choice of materials. The stiffness of tungsten carbide, measured in compression, is on the order of one hundred and twelve million pounds per square inch. This is only surpassed by diamond in readily available materials. The hardness of tungsten carbide is 91 HRA or 1500 Vickers. Abrasion tests rate it at 20 to 30 times hard steel. Now we compound these qualities by producing the material with a particulate grain diameter that is less than one micron. As if this isn't enough, the material hot isostatic pressed to achieve 100% density, virtually eliminating any porosity. The original cylinders that are used to produce the "Ultimate Quarter Round" are first centerless ground using a diamond wheel. They are then ring lapped to correct any Polylobular condition. Next they are machine lapped with three progressively finer diamond compounds, to achieve a surface quality that is below 0.1 microinches Ra, 2.5 nanometers. The normal mounting technique is to glue the component quarter rounds into a machined trench with a high strength ceramic filled epoxy. If the epoxy glue is objectionable, for vacuum or other reasons, a threaded hole can be provided at the apex of the triangular back mounting surfaces. This mounting method has been well proven in high-end optical applications. Unique Quarter Round components will be custom manufactured to meet any customer requirement. These may include corrosion resistance and special magnetic or electrical properties.
Kinematic Quarter Round Pricing
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