[Halld-pid] TOF Work plans

[Timothy Whitlatch]

Hi Paul, 

Generally a good summary. 

When do you plan on coming back to JLAB? Monday? I thought Wednesday. That is when we planned to have the work done. 

We are going to open up more holes than the one's designated to get as many threaded rods installed as possible that do not put force on the light guides. 

The threaded rod will be grade 8. 


Tim Whitlatch 
Hall D Engineer 
Jefferson Lab 
12050 Jefferson Ave ste 402 
Newport News, Va 23606 
757-269-5087 

----- Original Message -----

From: eugenio at fsu.edu 
To: "GlueX Particle ID Mailing List" <halld-pid at jlab.org> 
Cc: "Tom Carstens" <carstens at jlab.org>, "Tim Whitlatch" <whitey at jlab.org>, "Hussein Al Ghoul" <halghoul at fsu.edu> 
Sent: Wednesday, February 26, 2014 3:09:20 PM 
Subject: TOF Work plans 

Hi, 

Here is a summary of our plans discussed this past Monday. Please let me know if I missed something or have anything wrong. Also, I would like to confirm the items I have listed (?) as Tom either coordinating or purchasing. 





Paul 



To eliminate over constraining the modules we agreed to open up the TOF support frame to 100.5" x 100.5". 

===Task list==== 
* Open holes in channels 
- two holes on each channel need to be enlarged by 1/4" on the OD. 
- the hole location is the 10th hole from the end on both sides, the ~1/4 & ~3/4 location (most have been marked). 
- including all 8 channels, 16 holes need to be enlarged 
- Tom will take care of this by Monday (?) 

* Slot-open the bolt holes in Aluminum holding blocks 
- a 1/2" slot is being machined in each holding block 
- this will allow the frame and stud movement (1/4" on both sides) while keeping the holders fixed to the light guides 
- Paul is having the work done at the FSU Machine Shop and will deliver the parts next week 

* Open up TOF frame and square to 100.5" 
- Tom will coordinate this effort by Monday (?) 

* Replace channel end bolts with threaded rod 
- first (vertical) TOF layer: 
--replace outer channel bolts with threaded rod and set nuts 
-- bolts can be used for the inside channel holes 
- second (horizontal) TOF layer 
-- replace both channel bolts with threaded rod and set nuts 
- Tom will order new rods and nuts for delivery by Monday (?) 

* Replace channel Buna-N rubber (thicker/softer) 
- first (vertical) TOF layer: 
--currently 3/32" (50A Durometer) change to 3/16" (40A Durometer) 
- second (horizontal) TOF layer: 
--currently 3/16" (60A Durometer) change to 1/4" (40A Durometer) 
-Paul will order new Buna-N material for Monday 

* Repair remaining TOF module 
- Hussein will complete the repair of the last damaged TOF module. 

=============================== 










-- 
Prof. Paul Eugenio 
Florida State University 
Department of Physics 
Tallahassee, Florida, USA 32306 

(850) 325-0314 
eugenio at fsu.edu 






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