What Exactly Causes Cracked Handsets

JOHNNY4FISH · 23rd September 2006, 21:41

I SEE I ALOT OF PEOPLE TALKING ABOUT THIS, BUT WHAT IS THE MAIN CAUSE? IS IT IMPACT DAMAGE OR IS IT FROM THE PRESSURE?

THANK YOU

IS THERE ANY WAY TO DO ONE OF THOSE VOTING POLLS ON THIS SUBJECT?

JJ

sven · 23rd September 2006, 22:58

Quote: (Originally Posted by JOHNNY4FISH)

I SEE I ALOT OF PEOPLE TALKING ABOUT THIS, BUT WHAT IS THE MAIN CAUSE? IS IT IMPACT DAMAGE OR IS IT FROM THE PRESSURE?

THANK YOU

IS THERE ANY WAY TO DO ONE OF THOSE VOTING POLLS ON THIS SUBJECT?

JJ

JJ,

I wrote something about what I thought causes the flooded handsets: http://sven.rebreatherworld.com/post/10/91

After I sent them to APD for service, the message I got from them was that the cables were OK but the handsets had "stress cracks". The thinking in general is that these cracks are caused by
- bending the cable close to the handset (during transport, eg. in the car)
- stretching the cable
- banging/dropping the handsets
- crushing them (under somebody else's tank for instance)

I am not totally convinced that is a good explanation because I tend to treat my handsets like eggshells. But you never know ...

By the way, UPPER CASE is like shouting on the Internet and also hard to read.

**Steve** · 24th September 2006, 01:40

It is caused by poor material selection for the design chosen by AP.

silent running · 24th September 2006, 05:39

Quote: (Originally Posted by Steve)

It is caused by poor material selection for the design chosen by AP.

What's funny to me is that the cables to the handsets are very thick and look sturdy-a nice selling point. My guess is that it's the flexy part where the cable glans meet the potted part under the plastic cover that's one part of the problem.

Steve I think you're right and my guess is that the material chosen is not able to handle the stress of the pressure and temp changes plus the stress relief on the cable glans is inadequet. I don't think, strictly speaking, any normal impact/wear and tear could explain all the cracked handsets. They should be able to dangle about til kingdom come without any problem. As long as the stress relief at the glans is done properly and the potted material resists expansion/contraction enough-hardness, they would be quite durable.

Personally, I think any dangly bits should be as small and as light as possible. -Andy

decoweenie · 24th September 2006, 06:37

Quote: (Originally Posted by silent running)

Personally, I think any dangly bits should be as small and as light as possible. -Andy

Huhmm... I beg to differ on this point...

silent running · 24th September 2006, 07:12

Quote: (Originally Posted by decoweenie)

Huhmm... I beg to differ on this point...

Another comedian!

But seriously Phi, do those Inspo classic handsets really need to be that big? The Vision one is a good deal smaller, right? Was there some big "advance" in materials that made this possible in the last 4 yrs? Haven't heard of any cracked Vision handsets yet, no?

decoweenie · 24th September 2006, 07:23

Quote: (Originally Posted by silent running)

Another comedian!

Sorry, couldn't resist...

Quote:

...do those Inspo classic handsets really need to be that big? The Vision one is a good deal smaller, right? Was there some big "advance" in materials that made this possible in the last 4 yrs? Haven't heard of any cracked Vision handsets yet, no?

I am sure someone like Dave T (or Martin P) could explain the thinking process when it was designed 6 years ago...

But no, I don't think it needs to be that big - and the Vision handset is a "hugenormous" improvement, except for the supplied straps, but it is a very easy mod to rectify.

jptaylor9 · 24th September 2006, 09:10

Quote: (Originally Posted by silent running)

But seriously Phi, do those Inspo classic handsets really need to be that big? The Vision one is a good deal smaller, right? Was there some big "advance" in materials that made this possible in the last 4 yrs? Haven't heard of any cracked Vision handsets yet, no?

Don't forget that on the Classic, the electronics (processors etc) where in the two handsets, whereas they have been moved into the scrubber lid on the Vision.

silent running · 24th September 2006, 16:44

Quote: (Originally Posted by jptaylor9)

Don't forget that on the Classic, the electronics (processors etc) where in the two handsets, whereas they have been moved into the scrubber lid on the Vision.

Thanks for the info, sounds like thats where they should've been all along...

Mark Chase · 24th September 2006, 18:29

The cracked hand sets are caused by a poor design on the glands and a poor materials choice on the hand sets. The glands crushes the hand sets at point of contact putting the brittle material under stress and a slight knock or bend of the cable is enough to start a crack.

Very very annoying.

Why we let them get away with charging us for repairing a manufacturing error i have no idea.

ATB

Mark Chase

23rd September 2006, 21:41	#1 (permalink)
JOHNNY4FISH New Member Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Jul 2006 Location: CONNECTICUT, USA Posts: 25	What Exactly Causes Cracked Handsets I SEE I ALOT OF PEOPLE TALKING ABOUT THIS, BUT WHAT IS THE MAIN CAUSE? IS IT IMPACT DAMAGE OR IS IT FROM THE PRESSURE? THANK YOU IS THERE ANY WAY TO DO ONE OF THOSE VOTING POLLS ON THIS SUBJECT? JJ
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23rd September 2006, 22:58	#2 (permalink)
sven Blogs Admin / Forum Mod Current Rebreather/s: Inspiration Classic Other Rebreather/s: Evolution Join Date: Nov 2005 Location: Sydney Posts: 574	Re: What Exactly Causes Cracked Handsets Quote: (Originally Posted by JOHNNY4FISH) I SEE I ALOT OF PEOPLE TALKING ABOUT THIS, BUT WHAT IS THE MAIN CAUSE? IS IT IMPACT DAMAGE OR IS IT FROM THE PRESSURE? THANK YOU IS THERE ANY WAY TO DO ONE OF THOSE VOTING POLLS ON THIS SUBJECT? JJ JJ, I wrote something about what I thought causes the flooded handsets: http://sven.rebreatherworld.com/post/10/91 After I sent them to APD for service, the message I got from them was that the cables were OK but the handsets had "stress cracks". The thinking in general is that these cracks are caused by - bending the cable close to the handset (during transport, eg. in the car) - stretching the cable - banging/dropping the handsets - crushing them (under somebody else's tank for instance) I am not totally convinced that is a good explanation because I tend to treat my handsets like eggshells. But you never know ... By the way, UPPER CASE is like shouting on the Internet and also hard to read. __________________ Regards, Sven [SIZE=1]The Sydney Project website: [URL]http://www.sydneyproject.com[/URL] My Blog: [URL]http://sven.rebreatherworld.com[/URL] "Whenever you find yourself on the side of the majority, it's time to pause and reflect." Mark Twain[/SIZE]
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24th September 2006, 01:40	#3 (permalink)
Steve Ladies bring a plate Current Rebreather/s: Megalodon Home Build Other Rebreather/s: Not Bought Yet Inspiration Classic Sport Kiss Classic Kiss MK 15.X Home Build Join Date: Feb 2005 Location: Perth - Australia Posts: 1,068	Re: What Exactly Causes Cracked Handsets It is caused by poor material selection for the design chosen by AP. __________________ WARNING: I contain occasional coarse language, extreme sexual references, nudity, and adult themes, which may offend some people - Usually churchy types.
(Online)

24th September 2006, 05:39	#4 (permalink)
silent running Mature mouth breather Current Rebreather/s: Prism Topaz Other Rebreather/s: Join Date: Jun 2005 Location: U.S.A. Brooklyn, New York Posts: 1,774	Re: What Exactly Causes Cracked Handsets Quote: (Originally Posted by Steve) It is caused by poor material selection for the design chosen by AP. What's funny to me is that the cables to the handsets are very thick and look sturdy-a nice selling point. My guess is that it's the flexy part where the cable glans meet the potted part under the plastic cover that's one part of the problem. Steve I think you're right and my guess is that the material chosen is not able to handle the stress of the pressure and temp changes plus the stress relief on the cable glans is inadequet. I don't think, strictly speaking, any normal impact/wear and tear could explain all the cracked handsets. They should be able to dangle about til kingdom come without any problem. As long as the stress relief at the glans is done properly and the potted material resists expansion/contraction enough-hardness, they would be quite durable. Personally, I think any dangly bits should be as small and as light as possible. -Andy
(Online)

24th September 2006, 06:37	#5 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,510	Re: What Exactly Causes Cracked Handsets Quote: (Originally Posted by silent running) Personally, I think any dangly bits should be as small and as light as possible. -Andy Huhmm... I beg to differ on this point... __________________ "...after a while you get bored offering advice to a bull that like to keep butting the fence with its head rather than walking through the open gate..." - Rebreather World PM
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24th September 2006, 07:12	#6 (permalink)
silent running Mature mouth breather Current Rebreather/s: Prism Topaz Other Rebreather/s: Join Date: Jun 2005 Location: U.S.A. Brooklyn, New York Posts: 1,774	Re: What Exactly Causes Cracked Handsets Quote: (Originally Posted by decoweenie) Huhmm... I beg to differ on this point... Another comedian! But seriously Phi, do those Inspo classic handsets really need to be that big? The Vision one is a good deal smaller, right? Was there some big "advance" in materials that made this possible in the last 4 yrs? Haven't heard of any cracked Vision handsets yet, no?
(Online)

24th September 2006, 07:23	#7 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,510	Re: What Exactly Causes Cracked Handsets Quote: (Originally Posted by silent running) Another comedian! Sorry, couldn't resist... Quote: ...do those Inspo classic handsets really need to be that big? The Vision one is a good deal smaller, right? Was there some big "advance" in materials that made this possible in the last 4 yrs? Haven't heard of any cracked Vision handsets yet, no? I am sure someone like Dave T (or Martin P) could explain the thinking process when it was designed 6 years ago... But no, I don't think it needs to be that big - and the Vision handset is a "hugenormous" improvement, except for the supplied straps, but it is a very easy mod to rectify. __________________ "...after a while you get bored offering advice to a bull that like to keep butting the fence with its head rather than walking through the open gate..." - Rebreather World PM
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24th September 2006, 09:10	#8 (permalink)
jptaylor9 Custom Title Allowed! Current Rebreather/s: Inspiration Vision Other Rebreather/s: Inspiration Classic Join Date: Feb 2005 Location: London, UK Posts: 312	Re: What Exactly Causes Cracked Handsets Quote: (Originally Posted by silent running) But seriously Phi, do those Inspo classic handsets really need to be that big? The Vision one is a good deal smaller, right? Was there some big "advance" in materials that made this possible in the last 4 yrs? Haven't heard of any cracked Vision handsets yet, no? Don't forget that on the Classic, the electronics (processors etc) where in the two handsets, whereas they have been moved into the scrubber lid on the Vision.
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24th September 2006, 16:44	#9 (permalink)
silent running Mature mouth breather Current Rebreather/s: Prism Topaz Other Rebreather/s: Join Date: Jun 2005 Location: U.S.A. Brooklyn, New York Posts: 1,774	Re: What Exactly Causes Cracked Handsets Quote: (Originally Posted by jptaylor9) Don't forget that on the Classic, the electronics (processors etc) where in the two handsets, whereas they have been moved into the scrubber lid on the Vision. Thanks for the info, sounds like thats where they should've been all along...
(Online)

24th September 2006, 18:29	#10 (permalink)
Mark Chase I go down for ages Current Rebreather/s: Classic Kiss Other Rebreather/s: Inspiration Classic Join Date: Jan 2005 Location: Kent Posts: 2,470	Re: What Exactly Causes Cracked Handsets The cracked hand sets are caused by a poor design on the glands and a poor materials choice on the hand sets. The glands crushes the hand sets at point of contact putting the brittle material under stress and a slight knock or bend of the cable is enough to start a crack. Very very annoying. Why we let them get away with charging us for repairing a manufacturing error i have no idea. ATB Mark Chase __________________ Is it supposed to make that noise ? I took my unit to the dive shop and demanded they bolt on every thing that would fit. Join my elite diving teem and get a Tshirt "Doing It Chasey"Hammerhead Eccr Advanced Diving System
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