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'[OT]: Length of a spiral'
2002\01\21@151734 by steve

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I wasn't sure whether to label this question as [OT] or [EE] as I
want to know how many components I have left on a reel without
nailing one end to the letterbox and walking down the street.

Does anyone have a quick method at their fingertips ?

Steve.

======================================================
Steve Baldwin                Electronic Product Design
TLA Microsystems Ltd         Microcontroller Specialists
PO Box 15-680, New Lynn      http://www.tla.co.nz
Auckland, New Zealand        ph  +64 9 820-2221
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2002\01\21@154657 by David VanHorn

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At 09:13 AM 1/22/02 +1200, Steve Baldwin wrote:
>I wasn't sure whether to label this question as [OT] or [EE] as I
>want to know how many components I have left on a reel without
>nailing one end to the letterbox and walking down the street.
>
>Does anyone have a quick method at their fingertips ?
>


Weight might be more accurate, if you know the weight of an empty reel.



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2002\01\21@160906 by steve

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> >I wasn't sure whether to label this question as [OT] or [EE] as I
> >want to know how many components I have left on a reel without
> >nailing one end to the letterbox and walking down the street.

> Weight might be more accurate, if you know the weight of an empty
> reel.

And the weight of a full reel. These are SMT parts so the carrier
tape will weigh more than the bits. I think I'll start recording the
weight when they come in, though.
Hindsight is a wonderful thing.

That still leaves the parts that I have about 5 years supply of.

Steve.


======================================================
Steve Baldwin                Electronic Product Design
TLA Microsystems Ltd         Microcontroller Specialists
PO Box 15-680, New Lynn      http://www.tla.co.nz
Auckland, New Zealand        ph  +64 9 820-2221
email: .....stevebKILLspamspam.....tla.co.nz      fax +64 9 820-1929
======================================================

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2002\01\21@161702 by David VanHorn

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At 10:05 AM 1/22/02 +1200, Steve Baldwin wrote:
> > >I wasn't sure whether to label this question as [OT] or [EE] as I
> > >want to know how many components I have left on a reel without
> > >nailing one end to the letterbox and walking down the street.
>
> > Weight might be more accurate, if you know the weight of an empty
> > reel.
>
>And the weight of a full reel. These are SMT parts so the carrier
>tape will weigh more than the bits. I think I'll start recording the
>weight when they come in, though.
>Hindsight is a wonderful thing.
>
>That still leaves the parts that I have about 5 years supply of.
>
>Steve.

With the weight of an empty, you should be able to weigh 100, and make a
good estimate from that. Otherwise, I think you have to start hiking.

I think you would have a very hard time working out the spiraling interval
properly.

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2002\01\21@222734 by Roman Black

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Steve Baldwin wrote:
>
> I wasn't sure whether to label this question as [OT] or [EE] as I
> want to know how many components I have left on a reel without
> nailing one end to the letterbox and walking down the street.
>
> Does anyone have a quick method at their fingertips ?


Philips brand digital kitchen scale;
5kg max,
1g steps,
repeatability about 1g
cost about $35 US new.
I use it for counting parts quite often, on
the parts drawers you can write the weight of
100 transistors etc, and just weigh them for
stocktaking. It should work ok for your reels,
better than measuring reel width and definitely
better than unrolling to measure. :o)
-Roman

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2002\01\22@040124 by Alan B. Pearce

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>That still leaves the parts that I have about 5 years supply of.

To which my response is "why worry until there is only a couple of turns
left on the reel" ;)

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2002\01\22@165841 by Peter L. Peres

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Weigh 2 meters of carrier with parts and same without (on a letter scale
probably), then the empty reel (on a scale good to 1gram), and the reel
with the remaining stuff on it.

You can move parts reel2reeel, no need to hike. Think film spooler (you
can adapt one), the kind that comes in 2 parts and each screws onto the
edge of a shelf. You can make an optical counter (using a PIC) and count
the parts while spooling reel to reel. This is in fact the technique used
in small parts warehouses (big ones just throw the remaining reel if
incomplete). Note that when you spool the direction must be reversed so
the 'right' side of the parts remains outside and the unwinding direction
remains the same for the target reel. Keep this in mind when you go to
find the film spoolers, there are some with a 1/way clutch. You don't want
those.

hope this helps,

Peter

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2002\01\23@141935 by John Ferrell

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Can you provide:
Diameter of roll
Diameter of hub
number of wraps
component spacing?

That should provide enough data to make a pretty good estimate.

John Ferrell
6241 Phillippi Rd
Julian NC 27283
Phone: (336)685-9606
Dixie Competition Products
NSRCA 479 AMA 4190  W8CCW
"My Competition is Not My Enemy"



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