Help working out hourly production rates in spreadsheet please.

M

Macros The Black

Hi all,

Stuck on this one now. In my spreadsheet i have 3 columns that contain the
following info for my production machines

Total shift time (this will usually be 7:45 or 8:30 - formatted in hh:mm
format)
Downtime per shift (any value upto max shift time - formatted in hh:mm
format)
Kgs produced.

I would like to keep the time in hh:mm format as i do further calculations
on these - % downtime, total downtime, total shift hours etc (and also cos
it took be ages to figure out how to add up in time and i couldn't believe
how simple it was when i figured it out)

What i would like to be able to calculate is the actual production rate in
kgs/hr for the running itme of the machine

I have a calc running time=shift time-downtime : this works fine
Prod rate = kgs produced / running time

If i set shift time to 7:45, downtime to 2:45 - running time = 5:00
kgs prod = 10000, therefore prod rate = 2000 kg/hrs but calc gives me 48000
(presumably cos 05:00 it is converting to decimal or something ?)

Can anyone help me on this one please ??

-----------------------------------------------------------
question 2

i have a graph charting % downtime. this is set up for the full week but i
would like it to just display the data as we go along. the problem is that
it is displaying the lines at 0 for those days where data isnt available.
the column it is picking the data from also has a calc in it to not display
0's or errors. calc is =IF(C5="","",+C5/D5) where c5 and d5 represent lost
time/shift time.

If i delete this formula and leave the cell blank then the graph doesnt show
the point at all which is what i would like.

how do i get to this ?

Kind regards

Macros

(No more q's after this - i have racke dmy brains for hours trying to sort
these probs)
 
N

Nick Hodge

Macros

If running time is in C1 and production kgs in D1 then in E1 enter

=D1/(C1*24)

The time is a decimal of 1 day so multiplying it by 24 turns it into whole
numbers.

The second part will need you to use the NA function. Replace your "" in
the formula with NA(). This will not plot. If you don't like the #N/A
error in your display range. Create a new linked one to use as the chart
source.

--
HTH
Nick Hodge
Microsoft MVP - Excel
Southampton, England
(e-mail address removed)
 

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