FFM, Divator

[divetheworld]

I have a Divator II and want to use it with my breather purely for comms.
I love my AGA and don’t want to change it. The adaptors that are commercially available seem ludicrously expensive for what they are, or form a new DSV. $1000 complete is one such price.
What I am looking for is a way of adapting my FFM for the loop. Any suggestions?
I would prefer to keep it as cheap as possible but I envisage having to make a new housing for the original DSV parts which fit the bayonet on the AGA.
The Divator has been used many time before with breathers, Ian Gordon springs to mind, so I am assuming that CO2 build up is not a particular problem. Any experience?

This is something I have to do, rather than a nice to have.

[Mdemon]

I have a Divator Mk1 which I wish to do the same thing with. I agree - the shop one's are silly money.

Narked@90 (John R.) has a tame engineer who can machine stuff cheaply. Perhaps we should share thoughts and get some made? I agree that modding or replacing the insert seems to be the only way.

My thoughts were that while I was at it, adding an OC switchblock would be a good idea - allow a small 2nd stage to be clamped to the underside somewhere.

Would this fit with your plans?

Cheers,

John

Is CO2 build up much more likely with FFM on CCR than OC by the way?

[Andy the Coastie]

Would you like photos . and how to do it for less than a tenner ?

[nigelH]

Originally Posted by Mdemon

Is CO2 build up much more likely with FFM on CCR than OC by the way?

I can't see how it can be different. The incoming gas is CO2 free even more so than OC. You will get more CO2 inhaled but how much depends on how much the mask flexes and allows extra dead space. Certainly the KM in my avatar has lots of volume but CO2 isn't a problem. However that one has the problem of having somebody sitting on your shoulder and telling you when you get things wrong.

nigelH

[Mdemon]

Originally Posted by Andy the Commie

Would you like photos . and how to do it for less than a tenner ?

Yes please Andy!

Thanks Nigel.

[divetheworld]

Originally Posted by Mdemon

I have a Divator Mk1 which I wish to do the same thing with. I agree - the shop one's are silly money.

Narked@90 (John R.) has a tame engineer who can machine stuff cheaply. Perhaps we should share thoughts and get some made? I agree that modding or replacing the insert seems to be the only way.

My thoughts were that while I was at it, adding an OC switchblock would be a good idea - allow a small 2nd stage to be clamped to the underside somewhere.

Would this fit with your plans?

Cheers,

John

To do it seems simple, its just a barrel to which we fit our original parts into with a machined bayonet fitting to mate with the AGA front plate. I could do drawings for the basic unit.


Will require some thought as to fitting the OC bail. The OC part can be fitting an 'ABS Octopus' or other onto the DSV.
Would be as neat as Bob's ADV.

The best way to do this cheaply is to make a square block with a new shut off valve for the ADV, a bit like a three way valve on your central heating.

look at http://www.divenet.com/divematics/mouthpiece/ and you will see what I mean.
I could probably do drawings for that too.

The OC will stil need an inline shut off valve so it doesn't act as an ADV. The down side is you will have to shut the DSV then open the pneumatic valve. I can live with that to save that much money.

Thoughts would be needed on;
How to retain the rotary valve in the housing. Divematics use front retaining, I think this makes it larger than it needs to be. Any good ideas?
How to seal the valve vanes. Needs to be reliable and simple, I like the Draeger way but it makes it stiff.
How to 'cheaply' manifold the OC to the DSV, maybe an adaptor block that is bolted on the underside of the DSV but if you dont want it, you can use a blanking plate?

Maybe we should sort out a good design then ask John to get a price.
Hopefully we can find others to join in as a syndicate and keep the cost down.

Originally Posted by Andy the Commie

Would you like photos . and how to do it for less than a tenner ?

Chance would be a fine thing, but yes please. If you know, please share.

[Andy the Coastie]

Originally Posted by divetheworld

To do it seems simple, its just a barrel to which we fit our original parts into with a machined bayonet fitting to mate with the AGA front plate. I could do drawings for the basic unit.


Will require some thought as to fitting the OC bail. The OC part can be fitting an 'ABS Octopus' or other onto the DSV.
Would be as neat as Bob's ADV.

The best way to do this cheaply is to make a square block with a new shut off valve for the ADV, a bit like a three way valve on your central heating.

look at http://www.divenet.com/divematics/mouthpiece/ and you will see what I mean.
I could probably do drawings for that too.

The OC will stil need an inline shut off valve so it doesn't act as an ADV. The down side is you will have to shut the DSV then open the pneumatic valve. I can live with that to save that much money.

Thoughts would be needed on;
How to retain the rotary valve in the housing. Divematics use front retaining, I think this makes it larger than it needs to be. Any good ideas?
How to seal the valve vanes. Needs to be reliable and simple, I like the Draeger way but it makes it stiff.
How to 'cheaply' manifold the OC to the DSV, maybe an adaptor block that is bolted on the underside of the DSV but if you dont want it, you can use a blanking plate?

Maybe we should sort out a good design then ask John to get a price.
Hopefully we can find others to join in as a syndicate and keep the cost down.




Chance would be a fine thing, but yes please. If you know, please share.

I'll dig out my photo CD's from my attic and post them all on here for all to see..

What it basically is ,,, a spare front cover plate was used, arldited a B&Q washing machine pipe T Piece in it ,,, and screw the box pipes onto the ends ,,,, very simple

At the end of the day ,, is very simple

[divetheworld]

Originally Posted by Andy the Commie

I'll dig out my photo CD's from my attic and post them all on here for all to see..

What it basically is ,,, a spare front cover plate was used, arldited a B&Q washing machine pipe T Piece in it ,,, and screw the box pipes onto the ends ,,,, very simple

At the end of the day ,, is very simple

Ah, erm, yes. I need to use the comms so to use a spare cover plate is no good as this is where my comms goes.

Might give us ideas on how to fit it on the lower hole instead of the DV.

Are you related to Digger?

[Andy the Coastie]

Originally Posted by divetheworld

Ah, erm, yes. I need to use the comms so to use a spare cover plate is no good as this is where my comms goes.

Might give us ideas on how to fit it on the lower hole instead of the DV.

Are you related to Digger?

I used to use comms on mine very easy ,,,,,, best you see the piccies first.

DIGGER, bloody hell nooooooooo ,,, although he claims to be my son,,,,, but i was boxing it before he started diving ....
s'pose he found and followed his idol

[Brass Monkey]

I’m looking at using my Divator with the Ybod, I’ve been in touch with Filip for his Nemo OC / CC DSV and an adaptor for the Divator he quoted me 620 Euros (436 quid) complete. Not a bad price at all considering what you can pay for other OC / CC setups.

http://www.master.pl/~nemotech/rebreatherparts.htm

Dave.