JDZs Dolphin Article

***schford*** · 9th June 2005, 08:57

This thread is to discuss JDZs article on his home build.

http://www.rebreatherworld.com/artic...ticle&artid=57

Thanks - great article.

Stuart

jdz · 9th June 2005, 09:09

Thanks, guys...
If I don't respond as quick as I should, its because I'll be a bit preoccupied over the next 6 days...

I start training with my new prism Rebreather with four other mates this weekend. So I suppose it will be more photos etc etc...

Now to convert the prism Hud to vibrating... hmm... ;-)

Cheers, JDZ

Chris · 9th June 2005, 09:54

Quote: (Originally Posted by jdz)

Thanks, guys...

I start training with my new prism Rebreather with four other mates this weekend. So I suppose it will be more photos etc etc...

Cheers, JDZ

Hey JDZ
Best of luck with your course. I have 8 dives on mine this weekend, can't wait to give it a good workout !!
Cheers
Chris

Scuba_Vixen · 9th June 2005, 15:53

Wayyyyy Cooool, ......

I hope mine can turn out as nice.

The good part is that we who follow have you all who forged ahead to handle the R&D for us,

I think homebuilts are a lot like blending stations, "always a work in progress".

I was wondering after looking at your pics, is the cabling for the hud and PO2 meter run thru swageloc plastic tubing with the inserts at the ends and regular tubing fittings? ... Does it seem to be durable and tough?

Also, are the new box (milled out of a block) and the circuit boards available from the fellow on that website?

I'm thinking a second box and a microcontroller would facilitate electronic control at some future point.
Anyway, I'm rambling on again .......It is a Very Impressive Project

Thanks for posting the write up, you make a tough act to follow.

Darlene

Philippe GERIN · 9th June 2005, 18:02

Have a good time with your course JDZ,
Question: what kind of clear material did you use for the HUD housing in your second version?
Best
Philippe

jdz · 10th June 2005, 02:35

Thanks for your kind words

Quote: (Originally Posted by Scuba_Vixen)

Wayyyyy Cooool, ......

I hope mine can turn out as nice.

The good part is that we who follow have you all who forged ahead to handle the R&D for us,

I think homebuilts are a lot like blending stations, "always a work in progress".

I was wondering after looking at your pics, is the cabling for the hud and PO2 meter run thru swageloc plastic tubing with the inserts at the ends and regular tubing fittings? ... Does it seem to be durable and tough?
The tubing and swagelok fittings are standard. However, I use a silicon tube cut into short 5mm lengths to act as seals. If you look at http://www.rebreatherworld.com/gallery/showimage.php?i=593&c=34 you will see that I have used the ferule insert into the tube for strength and the smaller end "olive" but I have used the silicon tube instead of the larger olive. I find this connection more to my liking for u/w use. In the earlier HUD, I used solid cable with a silicon sleeve to get the same effect. Even though I know that the unit should be balanced at ambient pressure, I used a softer cable and found that it crushed as I was descending and I was always worried that I would get a bit of moisture past the seal. Anyway, so far so good.
Also, are the new box (milled out of a block) and the circuit boards available from the fellow on that website? Yes, they are available from Richard. I'm not sure if he is back... but an email will find that out!
I'm thinking a second box and a microcontroller would facilitate electronic control at some future point.
Anyway, I'm rambling on again .......It is a Very Impressive Project

Thanks for posting the write up, you make a tough act to follow.

Darlene

Cheers, JDZ

jdz · 10th June 2005, 02:55

Quote: (Originally Posted by Philippe GERIN)

Have a good time with your course JDZ,
Question: what kind of clear material did you use for the HUD housing in your second version?
Best
Philippe

One sleep to go....

The clear material is 16mm perspex rod (when I got it, I found out that it is made in a mould and not extruded rod, hence it is not perfectly round when it goes onto a lathe) however, in short pieces, it turns quite nicely. Trick is keeping the job cool and not allowing the rod to get hot!
fwiw.. attached dimensions...

Cheers, JDZ

Pierre Farrugia · 21st June 2005, 08:52

I am thinking about the possibility of fitting one the the YBOD, which should work. What I am afraid of is, as this will be the HUD if it's not working correctly you are monitoring your unit from one cell only! Do you have to calibrate each dive, as it will be a pain to remove screws every time!

jdz · 21st June 2005, 13:39

Hi Pierre,

I check the calibration of the two units in my setup (usually the night before) and during the predive I compare the units again. Usually they are pretty constantly in calibration. I check in air and at ~100%O2 plastic bag and loop. Over a month I have not noticed any unusual drop or variance in readings. I do access the inside for battery changes every month or so and hence may tweak the unit then. Having said that, my ppO2 unit only has 3 small screws...
Richard's unit on the other hand I don't know. I'll wait for my buddy's complaints!!
Cheers, JDZ

Pierre Farrugia · 24th June 2005, 11:27

Anyone tried to contacted them fpr the HUD as I send him my details but never replied back ?

Quote: (Originally Posted by jdz)

Hi Pierre,

I check the calibration of the two units in my setup (usually the night before) and during the predive I compare the units again. Usually they are pretty constantly in calibration. I check in air and at ~100%O2 plastic bag and loop. Over a month I have not noticed any unusual drop or variance in readings. I do access the inside for battery changes every month or so and hence may tweak the unit then. Having said that, my ppO2 unit only has 3 small screws...
Richard's unit on the other hand I don't know. I'll wait for my buddy's complaints!!
Cheers, JDZ

9th June 2005, 08:57	#1 (permalink)
*schford* RBW Founder Current Rebreather/s: Megalodon Sport Kiss Other Rebreather/s: Join Date: Jan 2005 Location: UK Posts: 3,564	JDZs Dolphin Article This thread is to discuss JDZs article on his home build. http://www.rebreatherworld.com/artic...ticle&artid=57 Thanks - great article. Stuart
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9th June 2005, 09:09	#2 (permalink)
jdz Prism Cave Diver Current Rebreather/s: Prism Topaz Dolphin Home Build Other Rebreather/s: Dolphin Home Build Join Date: Feb 2005 Location: Melbourne Australia Posts: 223	Thanks, guys... If I don't respond as quick as I should, its because I'll be a bit preoccupied over the next 6 days... I start training with my new prism Rebreather with four other mates this weekend. So I suppose it will be more photos etc etc... Now to convert the prism Hud to vibrating... hmm... ;-) Cheers, JDZ
(Offline)

9th June 2005, 09:54	#3 (permalink)
Chris Go Nude Or Go Home Current Rebreather/s: Megalodon Other Rebreather/s: Inspiration Classic Megalodon Prism Topaz Sport Kiss Join Date: Feb 2005 Location: Perth, Western Australia Posts: 615	Quote: (Originally Posted by jdz) Thanks, guys... I start training with my new prism Rebreather with four other mates this weekend. So I suppose it will be more photos etc etc... Cheers, JDZ Hey JDZ Best of luck with your course. I have 8 dives on mine this weekend, can't wait to give it a good workout !! Cheers Chris __________________ Megalodon Sorb and Sensors whilst in Australia www.divetub.com.au Diving & Photography @ www.uwphotog.com
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9th June 2005, 15:53	#4 (permalink)
Scuba_Vixen e/mCCR Dolphin Pilot Current Rebreather/s: Other CCR Home Build Other Rebreather/s: Other CCR Home Build Join Date: May 2005 Location: St. Croix USVI Posts: 557	Wayyyyy Cooool, ...... I hope mine can turn out as nice. The good part is that we who follow have you all who forged ahead to handle the R&D for us, I think homebuilts are a lot like blending stations, "always a work in progress". I was wondering after looking at your pics, is the cabling for the hud and PO2 meter run thru swageloc plastic tubing with the inserts at the ends and regular tubing fittings? ... Does it seem to be durable and tough? Also, are the new box (milled out of a block) and the circuit boards available from the fellow on that website? I'm thinking a second box and a microcontroller would facilitate electronic control at some future point. Anyway, I'm rambling on again .......It is a Very Impressive Project Thanks for posting the write up, you make a tough act to follow. Darlene
(Offline)

9th June 2005, 18:02	#5 (permalink)
Philippe GERIN ccr apprentice Current Rebreather/s: Megalodon Classic Kiss Other Rebreather/s: Join Date: May 2005 Location: Strasbourg, France Posts: 648	Have a good time with your course JDZ, Question: what kind of clear material did you use for the HUD housing in your second version? Best Philippe
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10th June 2005, 02:35	#6 (permalink)
jdz Prism Cave Diver Current Rebreather/s: Prism Topaz Dolphin Home Build Other Rebreather/s: Dolphin Home Build Join Date: Feb 2005 Location: Melbourne Australia Posts: 223	Thanks for your kind words Quote: (Originally Posted by Scuba_Vixen) Wayyyyy Cooool, ...... I hope mine can turn out as nice. The good part is that we who follow have you all who forged ahead to handle the R&D for us, I think homebuilts are a lot like blending stations, "always a work in progress". I was wondering after looking at your pics, is the cabling for the hud and PO2 meter run thru swageloc plastic tubing with the inserts at the ends and regular tubing fittings? ... Does it seem to be durable and tough? The tubing and swagelok fittings are standard. However, I use a silicon tube cut into short 5mm lengths to act as seals. If you look at http://www.rebreatherworld.com/gallery/showimage.php?i=593&c=34 you will see that I have used the ferule insert into the tube for strength and the smaller end "olive" but I have used the silicon tube instead of the larger olive. I find this connection more to my liking for u/w use. In the earlier HUD, I used solid cable with a silicon sleeve to get the same effect. Even though I know that the unit should be balanced at ambient pressure, I used a softer cable and found that it crushed as I was descending and I was always worried that I would get a bit of moisture past the seal. Anyway, so far so good. Also, are the new box (milled out of a block) and the circuit boards available from the fellow on that website? Yes, they are available from Richard. I'm not sure if he is back... but an email will find that out! I'm thinking a second box and a microcontroller would facilitate electronic control at some future point. Anyway, I'm rambling on again .......It is a Very Impressive Project Thanks for posting the write up, you make a tough act to follow. Darlene Cheers, JDZ
(Offline)

21st June 2005, 08:52	#8 (permalink)
Pierre Farrugia Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Feb 2005 Location: Malta Posts: 636	I am thinking about the possibility of fitting one the the YBOD, which should work. What I am afraid of is, as this will be the HUD if it's not working correctly you are monitoring your unit from one cell only! Do you have to calibrate each dive, as it will be a pain to remove screws every time! __________________ Pierre Farrugia My wife told me " If you don't quit diving I'm going to leave you" My reply " God, I'll miss you" www.atlam.org www.divemed.com
(Offline)

21st June 2005, 13:39	#9 (permalink)
jdz Prism Cave Diver Current Rebreather/s: Prism Topaz Dolphin Home Build Other Rebreather/s: Dolphin Home Build Join Date: Feb 2005 Location: Melbourne Australia Posts: 223	Hi Pierre, I check the calibration of the two units in my setup (usually the night before) and during the predive I compare the units again. Usually they are pretty constantly in calibration. I check in air and at ~100%O2 plastic bag and loop. Over a month I have not noticed any unusual drop or variance in readings. I do access the inside for battery changes every month or so and hence may tweak the unit then. Having said that, my ppO2 unit only has 3 small screws... Richard's unit on the other hand I don't know. I'll wait for my buddy's complaints!! Cheers, JDZ
(Offline)

24th June 2005, 11:27	#10 (permalink)
Pierre Farrugia Custom Title Allowed! Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Feb 2005 Location: Malta Posts: 636	Anyone tried to contacted them fpr the HUD as I send him my details but never replied back ? Quote: (Originally Posted by jdz) Hi Pierre, I check the calibration of the two units in my setup (usually the night before) and during the predive I compare the units again. Usually they are pretty constantly in calibration. I check in air and at ~100%O2 plastic bag and loop. Over a month I have not noticed any unusual drop or variance in readings. I do access the inside for battery changes every month or so and hence may tweak the unit then. Having said that, my ppO2 unit only has 3 small screws... Richard's unit on the other hand I don't know. I'll wait for my buddy's complaints!! Cheers, JDZ __________________ Pierre Farrugia My wife told me " If you don't quit diving I'm going to leave you" My reply " God, I'll miss you" www.atlam.org www.divemed.com
(Offline)

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