ppo2 meter houssing

**jmurba** · 16th June 2006, 15:26

Why don't you simply get a decent housing milled???? (after all the trouble you went trough..)

you are right...but I don't like to fail...and I don't like metal parts..i prefer plastic....
in addition I have the milled part because I have had one machined to make the mold...I wanted to be jesus christ : multiplying the houssings

regards

jean mi

paulraymaekers · 16th June 2006, 15:40

Quote: (Originally Posted by jmurba)

and I don't like metal parts..i prefer plastic....

well, plastic parts are easier milled than metal :-)

take a solid blok of delrin (POM), and go for it!

until now (I touch wood) NO rEvodream housing ever flooded, and they are often beiing used at + 100m
so making a desent housing is really not so terrible difficult

regards
paul

**jmurba** · 17th June 2006, 08:08

until now (I touch wood) NO rEvodream housing ever flooded, and they are often beiing used at + 100m
so making a desent housing is really not so terrible difficult

++++ Dear Paul, things are not difficult for you because, you are not a home builder, you are a professionnal making parts to sell it, ok not in the aim of making money i perfectly know that Rebreather making costs you time and money and that you do it for your friends and not to make a living we dived together, we have the same friends i know that you don't need to sell Rebreather to make a living, but your means are not our means and if it is easy for you to have acces to a milling machine, for us simple garage makers it is not easy to have access to a milling machine, w only have a chinese lathe nota milling machine.
I addition I wanted a nice shaped houssing to get a nice oxymeter not a square bloc of delerin like most of the oxymeter arround, and machining this in metal costs a lot of money so we did only one using the aerospacial machines in cannes (but we could do it only one time), if we had payed for it it would have costs the equivalent price of a meg rebreather !!!
Ok I ear you think , an ugly working black piece of metal is mutch better then a nice translucide well shaped leaking piece of shit , but to be honest I don't sell my stuff and do it for me, so if i did the same stuff then the others as a matter of fact it would have been easier for me to get stuff from you paying for that.
the thing is I failed on my last gauge....but the important thing is to try...like you Rebreather is just a game for me, I make my living doing my job, I could afford any Rebreather in the market, and any trainning , but I have chosen to dothin by myself cause i like it and because I did not find a machine that totaly meets my needs do I did it.
the last thing is that speaking on this forum gave me the solution, we are going to keep our houssing and we are going to transfer the o ring groove on the plexiglass and will have it machine for cheap, so the groove will be perfect.

regards

jean mi

Scuba_Vixen · 17th June 2006, 11:53

From looking at the photo a few posts back, a couple things that may have helped a lot are apparent.

1) Use more screws so the stress on the housing is more evenly distributed. ... Put one about every 2 cm all the way around and use a long thread engagement, .... 4 or 5 diameters

2) Use a larger cross section (thicker) O ring. ... The thicker the O ring is, the more forgiving of imperfections it is.

An easy and cheap way to get the surface flat, is to put some silicon carbide abrasive paper on a thick glass top table and move the housing in a circular motion on it. Continue untill the surface has an even appearance.

Darlene

paulraymaekers · 17th June 2006, 15:17

Quote: (Originally Posted by jmurba)

the last thing is that speaking on this forum gave me the solution, we are going to keep our houssing and we are going to transfer the o ring groove on the plexiglass and will have it machine for cheap, so the groove will be perfect

hello jean-mi, this CAN work well, except make sure the other surface is flat like the sea on a day without wind! :-)

good luck
paul

**jmurba** · 17th June 2006, 21:03

[quote=paulraymaekers]hello jean-mi, this CAN work well, except make sure the other surface is flat like the sea on a day without wind! :-)

Yes paul you are rigth , like darlene was saying a bit of surfacing will do I think.
on the orther hand even if that works i really think about encapsulating the electronics in epoxy.

anyway...for the moment I use tecme stuff and it is ok .

regards

jean mi

**Dave Sutton** · 24th June 2006, 16:58

Potting circuits as modules?

If the potting material does not need to be transparent, use parrafin wax..... easy to handle, melts cool, pours well, is waterproof, and easy to "un-pot" by immersion of a plastic bag containing the module in a pot of hot water.....

+++++++++++++++++++++++++++

Philosphophy lesson for the day:

Use the level of technology that meets the design requirement and no more.

Americans designed the nitrogen pessurized Fisher Space Pen to work in weightless conditions of space flight. Cost several $mil to develop.

Russians used pencil and got onto business.......

Lesson learned: Correct Tech often = Low Tech.

++++++++++++++++++++++++++++

Paraffin Wax is a great low-tech solution to potting. Use it for making all Mark-15 battery packs among other applications. Often used here for potting electronics and never a worry.

16th June 2006, 15:26	#21 (permalink)
jmurba wet bear Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: May 2006 Location: cannes france Posts: 920	Re: ppo2 meter houssing Why don't you simply get a decent housing milled???? (after all the trouble you went trough..) you are right...but I don't like to fail...and I don't like metal parts..i prefer plastic.... in addition I have the milled part because I have had one machined to make the mold...I wanted to be jesus christ : multiplying the houssings regards jean mi
(Offline)

16th June 2006, 15:40	#22 (permalink)
paulraymaekers rEvo's daddy Current Rebreather/s: rEvo Other CCR Home Build Other Rebreather/s: rEvo Other CCR Home Build Join Date: May 2005 Location: belgium Posts: 1,638	Re: ppo2 meter houssing Quote: (Originally Posted by jmurba) and I don't like metal parts..i prefer plastic.... well, plastic parts are easier milled than metal :-) take a solid blok of delrin (POM), and go for it! until now (I touch wood) NO rEvodream housing ever flooded, and they are often beiing used at + 100m so making a desent housing is really not so terrible difficult regards paul __________________ www.rEvo-rebreathers.com .... the earth is flat, Elvis is alive, and radial scrubbers give longer dwell time than axials...
(Offline)

17th June 2006, 08:08	#23 (permalink)
jmurba wet bear Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: May 2006 Location: cannes france Posts: 920	Re: ppo2 meter houssing until now (I touch wood) NO rEvodream housing ever flooded, and they are often beiing used at + 100m so making a desent housing is really not so terrible difficult ++++ Dear Paul, things are not difficult for you because, you are not a home builder, you are a professionnal making parts to sell it, ok not in the aim of making money i perfectly know that Rebreather making costs you time and money and that you do it for your friends and not to make a living we dived together, we have the same friends i know that you don't need to sell Rebreather to make a living, but your means are not our means and if it is easy for you to have acces to a milling machine, for us simple garage makers it is not easy to have access to a milling machine, w only have a chinese lathe nota milling machine. I addition I wanted a nice shaped houssing to get a nice oxymeter not a square bloc of delerin like most of the oxymeter arround, and machining this in metal costs a lot of money so we did only one using the aerospacial machines in cannes (but we could do it only one time), if we had payed for it it would have costs the equivalent price of a meg rebreather !!! Ok I ear you think , an ugly working black piece of metal is mutch better then a nice translucide well shaped leaking piece of shit , but to be honest I don't sell my stuff and do it for me, so if i did the same stuff then the others as a matter of fact it would have been easier for me to get stuff from you paying for that. the thing is I failed on my last gauge....but the important thing is to try...like you Rebreather is just a game for me, I make my living doing my job, I could afford any Rebreather in the market, and any trainning , but I have chosen to dothin by myself cause i like it and because I did not find a machine that totaly meets my needs do I did it. the last thing is that speaking on this forum gave me the solution, we are going to keep our houssing and we are going to transfer the o ring groove on the plexiglass and will have it machine for cheap, so the groove will be perfect. regards jean mi
(Offline)

17th June 2006, 11:53	#24 (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	Re: ppo2 meter houssing From looking at the photo a few posts back, a couple things that may have helped a lot are apparent. 1) Use more screws so the stress on the housing is more evenly distributed. ... Put one about every 2 cm all the way around and use a long thread engagement, .... 4 or 5 diameters 2) Use a larger cross section (thicker) O ring. ... The thicker the O ring is, the more forgiving of imperfections it is. An easy and cheap way to get the surface flat, is to put some silicon carbide abrasive paper on a thick glass top table and move the housing in a circular motion on it. Continue untill the surface has an even appearance. Darlene Last edited by Scuba_Vixen : 17th June 2006 at 11:55.
(Offline)

17th June 2006, 15:17	#25 (permalink)
paulraymaekers rEvo's daddy Current Rebreather/s: rEvo Other CCR Home Build Other Rebreather/s: rEvo Other CCR Home Build Join Date: May 2005 Location: belgium Posts: 1,638	Re: ppo2 meter houssing Quote: (Originally Posted by jmurba) the last thing is that speaking on this forum gave me the solution, we are going to keep our houssing and we are going to transfer the o ring groove on the plexiglass and will have it machine for cheap, so the groove will be perfect hello jean-mi, this CAN work well, except make sure the other surface is flat like the sea on a day without wind! :-) good luck paul __________________ www.rEvo-rebreathers.com .... the earth is flat, Elvis is alive, and radial scrubbers give longer dwell time than axials...
(Offline)

17th June 2006, 21:03	#26 (permalink)
jmurba wet bear Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: May 2006 Location: cannes france Posts: 920	Re: ppo2 meter houssing [quote=paulraymaekers]hello jean-mi, this CAN work well, except make sure the other surface is flat like the sea on a day without wind! :-) Yes paul you are rigth , like darlene was saying a bit of surfacing will do I think. on the orther hand even if that works i really think about encapsulating the electronics in epoxy. anyway...for the moment I use tecme stuff and it is ok . regards jean mi
(Offline)

24th June 2006, 16:58	#27 (permalink)
Dave Sutton Diveshop of Horrors Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Evolution Megalodon rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,907	Re: ppo2 meter houssing Potting circuits as modules? If the potting material does not need to be transparent, use parrafin wax..... easy to handle, melts cool, pours well, is waterproof, and easy to "un-pot" by immersion of a plastic bag containing the module in a pot of hot water..... +++++++++++++++++++++++++++ Philosphophy lesson for the day: Use the level of technology that meets the design requirement and no more. Americans designed the nitrogen pessurized Fisher Space Pen to work in weightless conditions of space flight. Cost several $mil to develop. Russians used pencil and got onto business....... Lesson learned: Correct Tech often = Low Tech. ++++++++++++++++++++++++++++ Paraffin Wax is a great low-tech solution to potting. Use it for making all Mark-15 battery packs among other applications. Often used here for potting electronics and never a worry. __________________ "Silent Diving with No Bubbles and No Politics".... www.nobubblediving.com
(Offline)

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