From: John Tserkezis 
Reply-To: Fidonet AVtech Echo 

Bob Lawrence wrote:

> JT> No Bob, you're going senile, you used to design television
> JT> sets. :-)
> 
>  Whenever some engineering problem needed "brains" the TV Lab ended
> up with it. I did a fan, too. They wanted to know why the fan motor
> was so noisy and hot... they were running the bloody iron saturated! I
> told them to put more turns on. I knew bugger-all about motors, so I
> treated it like a power transformer. It worked really well...

  Actually, increasing turns would probably make it worse unless it's the extra 
winding impedance you're relying on?

>>> How did we move from engineering to PR?

>> When you implied that vacuums were better for dust allergies.

> I only said that ion generators were useless, and a vacuum cleaner
> was better than nothing.

  Yeah ok, that's what happens when there's more than a few weeks from begining 
to end of a thread.

>>So, use a bigger motor. Back in the 70s, a 600W motor was *big*.
>>Now the entry level is 1600w!

> JT> Actually no, it's better to use a low power unit for better
> JT> fine dist collection. When I used to be a field techo, I
> JT> carried a vacuum to suck up toner from laser printers. We were
> JT> all given low power units because the photocopier guys (who
> JT> used them more than us) found the high power units used to suck
> JT> too much toner through the bag, into the motor and seriously
> JT> reduce the motor life.
> 
>  Weren't you talking about an effective filter restricting airflow
> too much? Now you seem to be recommending a lousy filter.

  No, I didn't say anything about the filters.  I only said (and implied) they 
used the SAME filters across their range of vacuums, just cranked up the power 
on the different models.  The higher power models would suck the fine toner 
particles through the filter, killing the motor earlier.
  The lower power models would keep most of them within the bag, thus overall, 
lasting longer.

>>Yes. We used to weigh the bag tested against an unmodified
>>machine on the same carpet. The head makes the biggest
>>difference, and the really hard part is to get it to work right
>>to the edge.

> JT> They never do, that's why they give you that small nozzle
> JT> thingy.

>  That's the chicken way out. The head makes an enormous difference to
> the way that the dirt is picked up. They stopped me before I could get
> right into it.

  Engineering costs too high?  Geeze, and they sell the current crop of crap 
like they were designed by NASA scientists.

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