Difference between revisions of "June 30, 2009 CDC Meeting"
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* Back disc (without isometric view) | * Back disc (without isometric view) | ||
** Point 5: counter-bore for stereo layers, why such a large diameter (.578), while diameter of the head of the feed thru is .500 in.? | ** Point 5: counter-bore for stereo layers, why such a large diameter (.578), while diameter of the head of the feed thru is .500 in.? | ||
+ | *** Not required, we will change it to .531 | ||
** Section B-B: why is the groove so deep (0.080 = 1/3 of the plate thickness)? | ** Section B-B: why is the groove so deep (0.080 = 1/3 of the plate thickness)? | ||
+ | *** Wish to get as long a glue joint as possible | ||
** What about the inner gas shell? Is there supposed to be a groove for the inner shell? | ** What about the inner gas shell? Is there supposed to be a groove for the inner shell? | ||
+ | *** We discussed this with Curtis at JLAB 7-7-09. We will put a C'bore for solid carbon fiber or fiberglass tube in upstream plate. Downstream will glue shell to inner bore of plate. Slav will create a layout showing this. | ||
** Is there a label foreseen to mark the start of each layer? | ** Is there a label foreseen to mark the start of each layer? | ||
+ | *** Yes, this is now on the drawing. | ||
** Is there a survey mark on the outside diameter of each plate for initial alignment? | ** Is there a survey mark on the outside diameter of each plate for initial alignment? | ||
+ | *** Curtis to discus with Gary what type of mark and where. | ||
* Back disk (with isometric view) | * Back disk (with isometric view) | ||
** We assume that inner/outer gas shell is not drawn? | ** We assume that inner/outer gas shell is not drawn? | ||
+ | *** yes | ||
** The holes: | ** The holes: | ||
*** What are the 2 top holes (outside gas volume) for? (2x .265) | *** What are the 2 top holes (outside gas volume) for? (2x .265) | ||
+ | ****Lifting features | ||
*** 2 holes at +-50 degrees outside gas volumes are fiducials? | *** 2 holes at +-50 degrees outside gas volumes are fiducials? | ||
+ | **** Yes | ||
*** 12 holes starting at 15 degrees (I count counter clockwise) are for rods? | *** 12 holes starting at 15 degrees (I count counter clockwise) are for rods? | ||
+ | **** Yes | ||
*** 6 remaining holes are for getting the gas inlets to the downstream end-plenum? Why are they so "far" away from the rods? We thought they are going to be cable-tied to the rods? Why is the diameter of those holes not larger? | *** 6 remaining holes are for getting the gas inlets to the downstream end-plenum? Why are they so "far" away from the rods? We thought they are going to be cable-tied to the rods? Why is the diameter of those holes not larger? | ||
** Are there standoffs for the mylar sheet? | ** Are there standoffs for the mylar sheet? |
Revision as of 13:49, 8 July 2009
Contents
Meeting Time and Place
Tuesday June 30 2009 at 11:00am At Jefferson Lab, the meeting will be held in room ARC 428
Connections
To connect from the outside, please use ESNET
1.) ESNET: 8542553
2.) Phone:
+1-800-377-8846 : US
+1-888-276-7715 : Canada
+1-302-709-8424 : International
then enter participant code: 39527048# (remember the "#")
Agenda
Questions/notes on the end plates
- Back disc (without isometric view)
- Point 5: counter-bore for stereo layers, why such a large diameter (.578), while diameter of the head of the feed thru is .500 in.?
- Not required, we will change it to .531
- Section B-B: why is the groove so deep (0.080 = 1/3 of the plate thickness)?
- Wish to get as long a glue joint as possible
- What about the inner gas shell? Is there supposed to be a groove for the inner shell?
- We discussed this with Curtis at JLAB 7-7-09. We will put a C'bore for solid carbon fiber or fiberglass tube in upstream plate. Downstream will glue shell to inner bore of plate. Slav will create a layout showing this.
- Is there a label foreseen to mark the start of each layer?
- Yes, this is now on the drawing.
- Is there a survey mark on the outside diameter of each plate for initial alignment?
- Curtis to discus with Gary what type of mark and where.
- Point 5: counter-bore for stereo layers, why such a large diameter (.578), while diameter of the head of the feed thru is .500 in.?
- Back disk (with isometric view)
- We assume that inner/outer gas shell is not drawn?
- yes
- The holes:
- What are the 2 top holes (outside gas volume) for? (2x .265)
- Lifting features
- 2 holes at +-50 degrees outside gas volumes are fiducials?
- Yes
- 12 holes starting at 15 degrees (I count counter clockwise) are for rods?
- Yes
- 6 remaining holes are for getting the gas inlets to the downstream end-plenum? Why are they so "far" away from the rods? We thought they are going to be cable-tied to the rods? Why is the diameter of those holes not larger?
- What are the 2 top holes (outside gas volume) for? (2x .265)
- Are there standoffs for the mylar sheet?
- We assume that inner/outer gas shell is not drawn?
- Front disc (without isometric view)
- [ADDRESSED] section B-B: inner plexiglass holder -> why the step
- [OPEN QUESTION] inner shell: how will it be attached?
- Is there anything foreseen for (grounding) standoffs?
- Label to mark the start of each layer?
- Survey mark for alignment at outer radius?
- Front disc (with isometric view)
- The holes:
- what are the two holes on the top, outside the gas volume?
- 6 holes starting at 0 degrees outside the gas volume are fiducials?
- 6 big holes at the top are for gas exaust (main volume to outside plenum)?
- 12 holes starting at 15 degrees are rods?
- We found again 6 holes relatively close (but not close enough we think) to the rods: gas to the downstream end-plenum? Why is diameter not larger (like 6 upper ones)?
- 24 tap holes (12 starting at 5 degrees and 12 starting at 25 degrees) as standoff for the swiss chees plate. Will this be enough for gas-tightness?
- We noticed the 6 gas-thru holes in the top are at a different radius (larger) than the other holes, why larger?
- Also in the bottom area we see holes at 2 slightly different radii, what is the reason for that?
- Gas: we think there are 6 holes missing in the top of this end plate: bleeding holes so the gas can "leak" into the main gas volume between the straws, are we missing something here?
- The holes:
Notes
- CDC Front Disc
- Section B-B, what is the small step? Small step to engage the inner hub.
- What will hold the inner tube to the end plates? Without the gas plenum, there is 3/8" on radius and after the polycarbonate, at least that much.
- OPEN How thick is ring on which inner tube is glued?
- Threaded inserts? These are for screwing in the gas plenum. Used in conjunction with the above mentioned groove to position plenum.
- Holes Sizes
- Crimp pin to plastic insert - CMU will think about the fit.
- Plastic inserts are all the same, make go 0.1" past the feed-thru.(Looks like 1.2).
- Gary wants a slip interference fit. line-to-line fit.
- Plastic Insert
- Want the counter-bored shoulder.
- Donuts and feed through both have glue port and vent.
- Feed through groove moved from 0.19 to 0.25" from tip on both Noryl and Al.
- Depth of drilled holes changes (Noryl is 0.56", AL is 0.7").
- Material for injection molding, HallB used glass-filled Noryl, What did Hall A use, does Eugene know?
- Get Mac-Master Carr part & grade for Noryl for donuts and feed thrus.