[TechAssist] Re: Best way to clean a head.
- From: "Jeff Dougherty" <jeff@xxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sun, 25 Nov 2001 23:51:40 -0500
Now wait a minute..I thought he wanted speed, not distance...
I want another shot..after I am well rested.....
Jeff
mailto:Jeff@xxxxxxxxxxxxxxxxxx www.9-11-2001tragedy.com
FAX 1-413-280-0677
Intrepid Video & Electronics
Harrisburg, PA 17111
717-909-8844
www.intrepid-video.com www.tech-repair.net www.thetoolcaddy.com
----- Original Message -----
From: <gulftech@xxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Sunday, November 25, 2001 6:48 PM
Subject: [TechAssist] Re: Best way to clean a head.
>
> Dennis,
>
> Regarding the brain teaser, I came up close to Clint at approx 80 miles.
>
> At 1800 rpm, the drum has 648, 000 rotations in a six-hour period.
>
> With a drum diameter of 2.5 inches, its circumference is 7.853975 inches.
>
> Therefore, a point on that circum. would travel 5,089,375 inches, or
> about 80 miles.
>
> You better give the answer, teach!
>
>
> Ken Smith
> Gulf Technical Services
> 3034 Gulf Breeze Parkway
> Gulf Breeze, FL 32561
> 850-934-8324 (Voice) 850-932-0819 (Fax)
>
>
> On Sun, 25 Nov 2001 09:47:57 -0600 "OrpheusComputing.com Repair"
> <techassist@xxxxxxxxxxxxxxxxxxxx> writes:
> >
> > For the TAPE, the "actual writing speed" if I remember
> > correctly is 19 fps. 3600 seconds in an hour, so 6 hrs has
> > 21,600 sec in it. Traveling at 19 fps, that's 410,400' or
> > roughly 78 mi. that is "writes". Not sure if that's what you
> > mean by "travels". :-)
> > -Clint
> >
> > Happy Thanksgiving &
> > God Bless Us All
> > Clint Hamilton, Owner
> > http://OrpheusComputing.com
> > http://ComputerHardware-ConsumerElectronics.com
> > sales@xxxxxxxxxxxxxxxxxxxx
> > Fax: 209-882-9602
> > TechAssist Administration
> > http://tech-assist.org
> > techassist@xxxxxxxxxxxxx
> > 4orpheus@xxxxxxxxxxxxx (alternates)
> > orpheuscomputing@xxxxxxxxx
> > (PLEASE include our previous correspondence
> > if replying to this email!!)
> >
> >
> > > Larry:
> > >
> > > I disagree with your statement, "I takes 2 heads to
> > complete a full picture".
> > > If on head is bad and the other good you will be missing 1
> > field of video. If
> > > you remember oUR NTSC format consists of 1 frame of video
> > is equivalent to two
> > > fields. The fields are interleaved together not appended to
> > to the end of the
> > > first field.
> > > Since they are interleaved together one will end up with 1
> > line of video and 1
> > > line of snow then 1 line of video and 1 line of snow. This
> > pattern will
> > > continue
> > > throughout the entire video field.
> > >
> > > The reason you get a picture on half of the screen, usually
> > the top, is
> > > because
> > > of head protrusion. The surface of the head must impinge
> > into the tape
> > > slightly
> > > just after the entrance guide. This impingement depth must
> > continue for the
> > > entire 180 degree swipe of the video head "A" and repeat
> > this process for
> > > video
> > > head "B".
> > > The main factor that effects head protrusion are wear.
> > Obviously head wear is
> > > something that only replacement is the answer. Insufficient
> > back tension
> > > coupled
> > > with head wear is usually responsible for the assessment
> > mentioned, "even and
> > > inch of video showing on the screen the heads are good" I
> > would agree with in
> > > part.
> > >
> > > As the video head travels around at 1800 rpm it creates air
> > turbulence, This
> > > turbulence does not negatively effect the entrance side of
> > the drum assembly
> > > where the tape meet the head. In fact the trailing side of
> > the video head chip
> > > had a lower pressure and will suck the tape in closer to
> > the head. But after
> > > the
> > > head has traveled 60+ millimeters to playback or record of
> > the first video
> > > field
> > > it looses the head to tape contact. One or two primary
> > factors can cause this,
> > > insufficient back tension and head wear.
> > >
> > > Any debris on the drum, or the video, or HI-FI heads can
> > cause the tape to be
> > > pushed away from the head trying to read it. This is why
> > the air channels in
> > > the
> > > drum must be kept free of any debris too. It is just as
> > important as the video
> > > head chips.
> > >
> > >
> > > I have a brainteaser for the group. How many miles does
> > single video head
> > > travel
> > > in 1 single pass of a 6 hour EP VHS tape?
> > >
> > > Dennis Viereck
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > Ledstiles@xxxxxxx wrote:
> > >
> > >> In a message dated 11/24/2001 4:27:32 PM Pacific Standard
> > Time,
> > >> billmcfarland@xxxxxxxxxxxxxx writes:
> > >>
> > >> <<
> > >>>>> Howdy Wally,
> > >>>>> If the heads are bad there won't be any video showing
> > on the screen,
> > >> if
> > >>>> you have even and inch of video showing on the screen
> > the heads are
> > >> good,
> > >>>>
> > >> Wally . This above is sooooo wrong. Most bad head problems
> > I run across have
> > >> the 1/2 good picture display. I takes 2 heads to complete
> > a full picture
> > >> after all.
> > >> Larry
> > >> N.C.S.
> >
> >
> >
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