Week 5:System Level Design Review
Table of Contents
Deliverables (by Friday 1/16/09)All documents generated by the P09701 team during Week 5 of MSD1 are to be posted here.
- Design Review: Friday 16 January 2008, 11am to 12:30pm in Xerox Auditorium
MSD1 Week 5 System Level Design Review
- How the system works:
1 System begins in the elevated position, held above posts by air cylinders. This allows user to place part on harp and/or change post size between measurements.
2. User places part on harp, enters part size into recipe, and presses measure button in TMS.
3. Top head is lowered onto posts and air cylinders disengage from top plate--top LightGage head is now resting solely on the three posts.
4. LightGage system will measure part and process data.
5. Once system is finished measuring part, air cylinders will extend once again, allowing user to remove part or change posts. User can choose to disable motions if they wish to measure the same part multiple times.
Design Review Slides
Design Review FeedbackNotes from discussion during MSD system level design Why not motors rather than pneumatics?
- Remove the requirement for an air supply (customer) NO
- Issues with them lowering at an angle (easier with a motor)
- charge time for cylinder (depends on cylinder, too long?) Light curtain positionlspecifics.
- Serves to stop head while doing fine adjustment?
- Safety for pneumatics?
- Be able to set micrometers 1 time per part (kinematic requirement)
o How vertical can the pneumatics be? o Repeatable? o Accurate when placed back down? Avoid set-up time and air situation by creating a drawer type system More weight to reduce settling time
- Will this effect the micrometer steadiness? How quickly will the system be able to stop?
- Will pneumatics be a problem?
Thermal cycling? not in spec Think about not only motion mistakes, but incorrect part mistakes, large mistakes and small mistakes Voice vibration and sound? (will subtle noise be an issue? Worried about rate of change
- Check thermal calcs
- Check various heat transfer methocls(conduction)
- Include inferometer heads
- Check any heat sources in or around system
- Electronic heat (wires)
- Check motors (if pneumatics do not work) Throughput analysis, lifting head and not lifting head
Watch the way micrometers are mounted (dropping particles, searing of surfaces, etc.)
- Conduct tests with various micrometers
If lead time on a part is too long, find a replacement or redesign Reduce air elements to 3, one at each micrometer
- Create a solid unit to flow up and down rather than 3 separate
- Guide rail to ensure straight up and down motion Consider distance of harp
- Closer to user?
- Expand room in front to allow for better access
Simplify micrometer process (change over time? 5 mm?) Thread the posts? Place tutorials/help into software, integrate posts (tell user which to use) etc. Adjust micrometers before it is lowered as a failsafe for their parallelism.Home | MSD 1 200802