sPHENIX discussion of the superconducting solenoid

["Anerella, Michael D" <mda AT bnl.gov>]

Kin,

Your statement regarding riggers is an important point.  It is not only the movement of steel from outside.  Ray Ceruti has reported several times that after holes are finished in a beam it is rigged into place and then measurements are taken for the holes in the next beam to avoid misalignment errors.  So the elapsed time to drill holes is not simply the total number of holes divided by the number of drills/technicians.  This setup and inspection time must be factored into the schedule.

Regards,

Mike

p.s. (8:00-4:30) - (lunch) – (breaks) = ~ 7 productive hours per day (to convert Jon’s hours to days).

 

 

 

 

From: sphenix-magnet-l-bounces AT lists.bnl.gov [mailto:sphenix-magnet-l-bounces AT lists.bnl.gov] On Behalf Of Kin Yip
Sent: Thursday, February 16, 2017 2:25 PM
To: O'Brien, Edward; Folz, Charles; Christie, William
Cc: sphenix-magnet-l AT lists.bnl.gov; Kobasiuk, Frederick D
Subject: Re: [Sphenix-magnet-l] Remaining hours of drilling / tapping ~ 579 hours

 

Hi,

I've talked with Jon and Jon will observe the situation.  If he sees that we have 3 technicians (etc.) and everything is used to the maximum, he'll suggest the 3rd drill.

But just like today, Jon can't get the riggers and he has to wait until tomorrow for the riggers (to take the steels from outside Bldg. 912 to inside Bldg. 912) .   So,
tomorrow morning, the technicians don't have steel to drills.    The technicians will probably need to wait until the afternoon to drill.

That's one kind of inefficiencies that we're suffering, too.   I wish riggers will be more readily available  :-)

Kin

On 02/16/2017 02:14 PM, Edward O'Brien wrote:

    Charlie,
     I agree with you. Depending on how Jon Hock did his estimate,
    this "inefficiency" could be built into his numbers, but
    the schedule for these type of projects rarely scale
    with the  number of people working on them.

    Ed

On 2/16/17 2:08 PM, Folz, Charles wrote:

Ed:

 

It will most likely not go quite that “linearly”. There is significant coordination required with both the Welder(s), (not directly under CAD control) and the Riggers to stage, cut and move the pieces to and from the drilling area.

 

Charlie

 

 

From: Edward O'Brien [mailto:eobrien AT bnl.gov]
Sent: Thursday, February 16, 2017 2:05 PM
To: Yip, Kin; Folz, Charles; Christie, William
Cc: sphenix-magnet-l AT lists.bnl.gov; Kobasiuk, Frederick D
Subject: Re: [Sphenix-magnet-l] Remaining hours of drilling / tapping ~ 579 hours

 

    Hi Kin,
     Thanks for the information. So if we can
    get 2 people to work full time on the drilling
    with two drills then this will take ~9 weeks
    once we factor in contingency. In a perfect world adding
    an additional person with an additional drill would
    reduce the 9 weeks to 6 weeks, but it is unlikely we would
    be able to work so efficiently that we'd be able to
    have that much schedule savings.
     Lets get going with two techs continuously drilling and
    tapping and in the mean time we'll see if it is possible
    to add a third person and drill.

    Ed
   

On 2/16/17 1:35 PM, Yip, Kin wrote:

Hi,

 

Thanks for the comment.  Though the no. of man-hours doesn't change, the no. of hours in time (if we can truly use two drills simultaneously all the time) will hopefully cut in half, right ?

 

Sent from my Verizon 4G LTE Smartphone

 

------ Original message------

From: Folz, Charles

Date: Thu, Feb 16, 2017 1:14 PM

To: Yip, Kin;Christie, William;

Cc: sphenix-magnet-l AT lists.bnl.gov;Kobasiuk, Frederick D;

Subject:RE: Remaining hours of drilling / tapping ~ 579 hours

 

All:

 

Please note that the use of two drills does not cut the required labor hours in half. There may be some economy gained by having two technicians able to provide mutual assistance to each other, but the required labor hours is still in the area of 579.

 

Charlie

 

From: Yip, Kin
Sent: Thursday, February 16, 2017 12:42 PM
To: Christie, William
Cc: sphenix-magnet-l AT lists.bnl.gov; Folz, Charles; Kobasiuk, Frederick D
Subject: Remaining hours of drilling / tapping ~ 579 hours

 

Hello Bill,

 

As I mentioned to you yesterday,  attached is a spreadsheet from Jon Hock that shows the technician hours needed to finish drilling holes in steel for sPhenix High-Field Test.  It does not include assembly hours for technicians, survey, etc…

 

After a couple modification (and timing observation), he came up with 579 hours for the remaining hours

of drilling and tapping.   ( For management type of people, you can add 25% contingency J )

 

Even with two drills at the same time, 579/2 ~290 hours is still a lot of hours remained to be done.  We need

all the help that we can get J

 

Kin

 

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