Custom test fixture |
| 02-14 17:04:13 来源： 作者： |
|
Custom test fixture Inquiry (采购产品): Custom test fixture We are a Medical Device Reprocessing Facility. We are looking for someone to build a custom test fixture for comparison testing of OEM devices to our reprocessed devices. User requirements below: Please send quote. This test fixture will be used to test Arthroscopic Shavers and Surgical Saw Blades sharpness, made by OEM: Linvatec, Stryker, Dyonics, Microaire, most brands. User requierments: 1. The cutting head (saw assembly, shaver assembly, etc.) should be secured to a platform that translates on a set of Thompson Rails (or equivalent). This will provide a smooth path for the cutting head that isn’t susceptible to the ‘stick-slip’ of traditional guide ways. The Thompson rail system also prevents the cutting head from translating or rotating about other axes. 2. The rig should contain a provision for securing any cords attached to the saws or shavers such that they have enough length to permit the cutting head to travel without having to ‘drag’ the cord behind it , if a corded handpiece is selected. 3. The cutting head should be driven with a variable speed and feed controller and repeatable motion system. One concept involves using an electric motor and ball-screw that would be mounted beneath and between the Thompson Rails and covered with a bellows or similar shielding to prevent the cut media and irrigation from falling on the ball-screw and getting into the bearings. This type of system along with its motion controller would allow the flexibility to assign a given feedrate and then monitor the temperatures that were a result of the cutting, use the current draw on the motor as an indication of how freely the cut was proceeding, or limit the motor current to a set value and then measure the depth of cut. A lower current draw would indicate that the instrument was sharp and cutting the media without overworking the test rig, conversely a higher current measurement would indicate that the rig’s motor was having to work extra hard to drive a duller blade through the media. 4. Provide a motion control and /or measuring points such that meters, recorders, or digital data acquisition could be used to collect the data of interest. 5. The enclosure should be made such that it could be placed under negative pressure and any dust or other particulate could be evacuated with a common dust collector (i.e. Shop Vac or similar apparatus). 6. The enclosure should be constructed such that it is possible for a test operator or any observers to see the device in operation. The enclosure would provide protection from flying debris or in the rare case that a blade would become detached from the cutting head or fracture during use. 7. The cutting head should be constructed in such a way that interchangeable sub-plates could be attached to the cutting head carriage. These sub-plates would have dowels, clamps, or other methods of attachment that were specific to a given handpiece or family of handpieces (i.e. one sub-plate would be used for Linvatec corded handpieces, another would hold Linvatec battery operated handpieces, and another would be used for Stryker etc). All of these sub-plates would have the same configuration that would attach to the cutting head carriage. The sub-plates would also keep the cutting instrument in nearly the same location regardless of the handpiece being used. 8. A combination of software limits, limit switches and / or hard stops should be used to prevent the cutting instrument from cutting through the media and causing damage to the test rig or enclosure. 9. If a provision is to be made to allow for the inclusion / attachment of a pyrometer care must be exercised to keep the instrument from being impacted by the particulate or dust that will be generated by the cutting action. Additionally, the usage of a pyrometer requires that the reflectivity of the instruments be taken into consideration and accounted for during the sample preparation or configuration of the pyrometer itself. 10. An interface should be provided that would allow for the operator to change / input the required feed rate, distance to be traveled, or other relevant parameters. 11. A method of actuating the trigger of the handpieces should also be included. One embodiment of this concept could involve a simple system that uses an air or electric controlled cylinder to fully depress the trigger for a cut and release the trigger upon completion of the test, development of an error condition, or the use of an illuminated emergency stop button being depressed. This system would be preferable and safer than other concepts, such as using a cable tie to hold the trigger depressed. 12. The rig should be constructed with as much COTS material as possible so that spares are easily obtainable and the rig could be serviced by maintenance or Engineering personnel. 13. The test fixture must operate on 110/120 VAC, 50/60 Hz. 14. The footprint will be compact in design that it could be transported on a wire rack or similar cart system. 15. The interior of the enclosure must be made of corrosion resistant materials, protected against leaking and the hand pieces must be protected from splatter as liquid irrigation will be used during certain testing. 16. The test fixture must be able to be provided with suction either internally or externally. 17. Sufficient clearance shall be provided so that when the handpiece is attached to the sub-plate, the blades can be inserted and removed from the handpiece without removing the handpiece from the sub-plate. 18. For dry cutting a vise, clamp, or similar holding mechanism should be provided to hold the test media securely in position while it is being cut. The holding mechanism should be able to move side to side so that multiple cuts can be made on a single piece of media with respect to the centerline of the handpiece when it is attached to the sub-plate on the cutting head. A cutting blade guide needs to be incorporated to stabilize the cutting blade during testing. The holding mechanism must be interchangeable with the wet cutting holding mechanism. 19. For wet cutting same as above with an exception the holding mechanism will need to be submerged for certain testing. Use of a holding tank with holding mechanism incorporated could be a possibility. The holding mechanism must be interchangeable with the dry cutting holding mechanism. 20. Lighting should be integrated with the enclosure such that there is sufficient illumination to allow the cutting action to be observed while the enclosure is shut / sealed. The lighting should be protected such that chips or debris that is generated during the cut will not accumulate on the lamp or cause the lamp to burst if it were impacted during the cutting process. 21. All operator controls shall be located on the exterior of the enclosure such that the operator has complete access to any buttons, switches, keypads, etc. without having to open the enclosure and will be either PLC or Microcontroller system controlled. 22. Enclosure should be mounted on rubber pads or some other material that will not mar the surface that the test rig is placed on. Additionally, these pads should help attenuate any vibrations that are generated during cutting so that the test rig remains in its position without sliding around the work area and does not transfer an objectionable amount of vibration into the work surface. 23. The sub-plates should include rubber or some similar material that will attenuate vibrations as well as prevent the surface of the handpiece from being marred by the sub-plate during use. 24. Appropriate operator safety considerations should be included such as: illuminated Emergency Stop Buttons, an interlock that prevents the enclosure from being opened while the rig is in motion or stops all motion if the enclosure is opened during motion. A two handed system could be included to allow the cutting head to be jogged into position with the enclosure open. 25. Life expectancy must be at least two (2) years. With the first year to include parts and labor for any malfunction during normal use. If you have any questions, |
|
|
|
|
|
|
