Application - Shrink Fit Bearings and Bushings and Pins
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Press fit or Shrink fit bushing design and installation is a common method of retaining bearings by use of interference between the bushing and the bushing hole. Bushings are available in standard sizes with both inside and outside diameter surfaces finished, and are commonly available in many sizes.
Typically, bushings are designed and manufactured 0.002 to 0.003 inch over nominal on outside diameter sizes for sizes 3 inches or less. Diameters greater than 3 inches, outside diameters are designed 0.003 to 0.005 inch over the nominal size. Because interference material is built into the bushings, and the bushing is normally manufactured to tolerances of +/- .0002. The effective interference of the press fit is designed and facilitated within the target hole which the bushing is installed. The process of press or shrink fitting the bushing into the hole causes the bearing to reduce in size due to the compressive forces applied. Additionally, the material which the bushing has been pressed into distorts some as well. In general, diameter changes are equal to 70-100% of the amount of the material fit. Unfortunately, precisely or mathematically predicting the size change due to the effective compressive forces applied during installation is not always accurate. Typical installation compression forces and effective diameter changes may be modeled or characterized by fabricating several test cases and measuring the range and variations of the actual fit. Often, bushings are designed with additional diametrical material requiring a post press fit installation machine process to accurately ream to the desired diameter. |
Shrink fits are facilitated by chilling the bushing using a suitable median, such as liquid nitrogen, dry ice, or by placing the bushing within a freezer. Cooling down the bushing is preferred rather than heating the target housing.
Normally, the bushing is of significantly less mass than the target housing, though heating the housing and simultaneously cooling the bushing is not uncommon. When a bushing or bearing is pressed into a housing, the force driving it should be applied equally or uniform to the end of the bearing to avoid galling, peening or damaging the bushing/bearing. The mating surfaces of both the bushing and housing should be thoroughly cleaned and imperfections as well as burrs removed. These units are intended for storage, not rapid cooling. Filling a -80 unit with warm steel can end the life of a compressor before it's time. When using our units for cooling, build up some "Cold Mass" in the freezer to help bring new product down to temperature more quickly, as well as to alleviate the stress on the compressor(s). "Cold Mass" is generated by product already stored in the freezer at the desired low temperature. This can be achieved by filling the unit in stages - thirds or quarters at a time, or by filling unused space in the freezer with scrap metal or rejected parts. Always have more cold mass than new warm product. Our freezers are designed for maintaining temperature, and not quick freezing. We do not offer any specification on how quickly they can freeze your products. No freezer is intended to have hot parts introduced. Applications for shrink fit or cold testing products or cooling products for any reason can shorten the work life of any freezer. Please consult an IDS rep to discuss your application. |
2003012 = (-85C) Ultra ColdCube Benchtop Freezer, 115V
LOADING DOCK SHIPPING INCLUDED
Must be a commercial address in Continental US that can receive loading dock shipment. Build time will vary - 8 weeks.
Ultra Low Temp Freezer -85C (ULT) Benchtop or Undercounter Freezer for Vaccine, DNA, Allograft Tissue, PMF Epoxy, Prepreg, Cold Testing. Used in Laboratories, Hospitals, and Clinics and on Manufacturing Floors.
115 volt (Standard US / 3 prong)
OPTIONAL CHART MONITOR NOT INCLUDED
CALL DIRECT FOR FASTER BUILD TIMES, OR TO ADD A CHART OR OTHER OPTIONS.
2003006 = (-85C) 1.7 CF Ultra Cold Chest 115V Freezer
LOADING DOCK SHIPPING INCLUDED - Must be a commercial address in the continental US that can receive a loading dock shipment. Build time may vary.
Ultra Cold (ULT) Chest Freezer -85C, 1.7CF for Industrial, Medical, and Scientific use. Storage for Vaccine, DNA, Allograft Tissue, PMF Epoxy, Prepreg, Cold Testing. 115V (230V available upon request)
For warranty information CLICK HERE
OPTIONAL CHART MONITOR IS NOT INCLUDED - CALL US TO ADD OPTIONS AND PLACE ORDERS
2003008 = (-85C) 3.1 CF Ultra Cold Chest Freezer, 115V
LOADING DOCK SHIPPING INCLUDED - Must be a commercial address in the continental US that can receive a loading dock shipment. Build time may vary.
Ultra Cold (ULT) Chest Freezer -85C, 3.1 CF for Industrial, Medical, and Scientific use. Storage for Vaccine, DNA, Allograft Tissue, PMF Epoxy, Prepreg, Cold Testing. 115V (230V available upon request)
For warranty information CLICK HERE
OPTIONAL CHART MONITOR IS NOT INCLUDED - CALL US TO ADD OPTIONS AND PLACE ORDERS
2003010 = (-85C) 6.8 CF Ultra Cold Chest Freezer, 115V
LOADING DOCK SHIPPING INCLUDED - Must be a commercial address in the continental US that can receive a loading dock shipment. Build time may vary.
Ultra Cold (ULT) Chest Freezer -85C, 6.8CF for Industrial, Medical, and Scientific use. Storage for Vaccine, DNA, Allograft Tissue, PMF Epoxy, Prepreg, Cold Testing. 115V (230V available upon request)
For warranty information CLICK HERE
OPTIONAL CHART MONITOR IS NOT INCLUDED - CALL US TO ADD OPTIONS AND PLACE ORDERS
2003000 = (-80C) 9.4 CF Ultra Cold Chest Freezer, 115V
LOADING DOCK SHIPPING INCLUDED - Must be a commercial address in the continental US that can receive a loading dock shipment. Build time may vary.
Ultra Cold (ULT) Chest Freezer -80C, 9.4CF for Industrial, Medical, and Scientific use. Storage for Vaccine, DNA, Allograft Tissue, PMF Epoxy, Prepreg, Cold Testing. 115V (230V available upon request)
For warranty information CLICK HERE
OPTIONAL CHART MONITOR IS NOT INCLUDED - CALL US TO ADD OPTIONS AND PLACE ORDERS
2003002 = (-80C) 12 CF Ultra Cold Chest Freezer, 115V
LOADING DOCK SHIPPING INCLUDED - Must be a commercial address in the continental US that can receive a loading dock shipment. Build time may vary.
Ultra Cold (ULT) Chest Freezer -80C, 12 CF for Vaccine, DNA, Allograft Tissue, PMF Epoxy, Prepreg, Cold Testing. Used in Laboratories, Hospitals, and Clinics and on Manufacturing Floors. 115V (230V available upon request)
For warranty information CLICK HERE
OPTIONAL CHART MONITOR IS NOT INCLUDED - CALL US TO ADD OPTIONS AND PLACE ORDERS
2003004 = (-80C) 21 CF Ultra Cold Chest Freezer, 230V
LOADING DOCK SHIPPING INCLUDED - Must be a commercial address in the continental US that can receive a loading dock shipment. Build time may vary.
For warranty information CLICK HERE
Ultra Low Temp Chest Freezer for Vaccine, DNA, Allograft Tissue, PMF Epoxy, Prepreg, Cold Testing. Used in Laboratories, Hospitals, and Clinics and on Manufacturing Floors.Ultra Cold (ULT) Chest Freezer -80C, 21 CF for Industrial, Medical, and Scientific use in Laboratories, Hospitals, and Clinics.
OPTIONAL CHART MONITOR IS NOT INCLUDED - CALL US TO ADD OPTIONS AND PLACE ORDERS - (818) 597-4300.
230v Model only. 115V not available at this time.
The voltage can be 208 - 230V (60 hz Standard or 50hz upon request). SJO power cord does not include plug and the plug must be added or the unit must be hard wired when installed on site.
