Mouthpiece Work / Gerber's seal test
FROM: kwbradbury (Keith Bradbury)
SUBJECT: Gerber's seal test
I'm not a fan of seal testing, but this is a cool video of one: http://www.jgerber.com/jgcustom/jgcustom.wmv
FROM: keith29236 (Edward McLean)
SUBJECT: Gerber's seal test
Yes a cool video for sure. The test lasted three seconds but the video
much longer to promote the mouthpice presumably and what is the
significance of the specified Marca Jazz #3 reed ? :)
The test wasn't very convincing somehow. I would have thought that
the tester should have used a conventional blowing embouchure, while
sucking.
The video clearly indicates a loose lollipop, all enveloping
embouchure which would not expose uneven rails, which I understand is
the reason for carrying out the test.
Eddie
FROM: kwbradbury (Keith Bradbury)
SUBJECT: Re: Gerber's seal test
>... what is the > significance of the specified Marca Jazz #3 reed ? :) I think softer reeds do better on the seal test. Harder worse. > The test wasn't very convincing somehow. I would have thought that > the tester should have used a conventional blowing embouchure, while > sucking. > The video clearly indicates a loose lollipop, all enveloping > embouchure which would not expose uneven rails, which I understand is > the reason for carrying out the test. I do not think it matters hows the vacuum is established. If there is a low or high spot on the rails, it air will leak there. Gradually uneven rails and twisted facings can still do well on the seal test with a soft reed. Facings that are flat near the tip do better than arced. Heck, a totally straight facing with a tip opening of .000" does great!
FROM: ed_svoboda (esvoboda@...)
SUBJECT: Re: Gerber's seal test
Aaron Santee endorses Marca reeds and he was the one doing the suck test. Ed > > > >... what is the > > significance of the specified Marca Jazz #3 reed ? :) > > I think softer reeds do better on the seal test. Harder worse. > > > The test wasn't very convincing somehow. I would have thought that > > the tester should have used a conventional blowing embouchure, while > > sucking. > > The video clearly indicates a loose lollipop, all enveloping > > embouchure which would not expose uneven rails, which I understand is > > the reason for carrying out the test. > > I do not think it matters hows the vacuum is established. If there is > a low or high spot on the rails, it air will leak there. > > Gradually uneven rails and twisted facings can still do well on the > seal test with a soft reed. Facings that are flat near the tip do > better than arced. Heck, a totally straight facing with a tip opening > of .000" does great! > > > > > > > Got a Mouthpiece Work question? Send it to MouthpieceWork@yahoogroups.com > > Visit the site at http://groups.yahoo.com/group/MouthpieceWork to see the Files, > Photos and Bookmarks relating to Mouthpiece Work. > > To see and modify your groups, go to http://groups.yahoo.com/mygroups > Yahoo! Groups Links > > > > > > >
FROM: keith29236 (Edward McLean)
SUBJECT: Gerber's seal test
Call me a sceptic but I fail to see how air can be drawn over a faulty
facing/reed gap/hump if the lips are covering this fault the way A.S.
seems to be sucking in the video.
The suction has to be on the tip side of the fault,for any air to be
drawn in.
For any meaningful result, the suction test would have to be applied
to different facing positions, progressivly withdrawing the lips
towards the tip, to find the position of a leak, if any.
A hard reed will prevent the reed closing and masking the fault.
It all sounds a bit iffy to me.
Eddie
FROM: keith29236 (Edward McLean)
SUBJECT: Gerber's seal test
After my previous ramblings, I now see the reason for the twelve
second delay on the video. The reed actually opened eventually. Cute!
I tried the test on a Lawton 100 tenor MPC with a Larsen #2
reed. The rails are even, according to my gauge.
I could not get it to work. Perhaps a very soft reed is
required ?
Eddie
FROM: kymarto (Toby)
SUBJECT: Re: Gerber's seal test
It seems to me that the seal test would only show up irregularities that were small enough that the elasticity of the reed would not be able to compensate for them. Big irregularities, such as uneven (but smooth) side rails, might not show up.
Toby
----- Original Message -----
From: Edward McLean
To: MouthpieceWork@yahoogroups.com
Sent: Friday, April 08, 2005 1:50 AM
Subject: [MouthpieceWork] Gerber's seal test
Call me a sceptic but I fail to see how air can be drawn over a faulty
facing/reed gap/hump if the lips are covering this fault the way A.S.
seems to be sucking in the video.
The suction has to be on the tip side of the fault,for any air to be
drawn in.
For any meaningful result, the suction test would have to be applied
to different facing positions, progressivly withdrawing the lips
towards the tip, to find the position of a leak, if any.
A hard reed will prevent the reed closing and masking the fault.
It all sounds a bit iffy to me.
Eddie
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FROM: tjparkski (Timothy Parks)
SUBJECT: Re: Gerber's seal test
I was talking to an Aleutian friend of mine the other day about seal
testing and he said "don't bother, they are very stupid and all they can do
is eat fish"
_____
From: Toby [mailto:kymarto123@...]
Sent: Thursday, April 07, 2005 6:11 PM
To: MouthpieceWork@yahoogroups.com
Subject: Re: [MouthpieceWork] Gerber's seal test
It seems to me that the seal test would only show up irregularities that
were small enough that the elasticity of the reed would not be able to
compensate for them. Big irregularities, such as uneven (but smooth) side
rails, might not show up.
Toby
----- Original Message -----
From: Edward <mailto:ewmclean@...> McLean
To: MouthpieceWork@yahoogroups.com
Sent: Friday, April 08, 2005 1:50 AM
Subject: [MouthpieceWork] Gerber's seal test
Call me a sceptic but I fail to see how air can be drawn over a faulty
facing/reed gap/hump if the lips are covering this fault the way A.S.
seems to be sucking in the video.
The suction has to be on the tip side of the fault,for any air to be
drawn in.
For any meaningful result, the suction test would have to be applied
to different facing positions, progressivly withdrawing the lips
towards the tip, to find the position of a leak, if any.
A hard reed will prevent the reed closing and masking the fault.
It all sounds a bit iffy to me.
Eddie
Got a Mouthpiece Work question? Send it to MouthpieceWork@yahoogroups.com
Visit the site at http://groups.yahoo.com/group/MouthpieceWork to see the
Files, Photos and Bookmarks relating to Mouthpiece Work.
To see and modify your groups, go to http://groups.yahoo.com/mygroups
Got a Mouthpiece Work question? Send it to MouthpieceWork@yahoogroups.com
Visit the site at http://groups.yahoo.com/group/MouthpieceWork to see the
Files, Photos and Bookmarks relating to Mouthpiece Work.
To see and modify your groups, go to http://groups.yahoo.com/mygroups
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