For the machining gurus who've done a DSV...

whoizrob · 21st April 2008, 23:20

When you machine the cage, how did you go about making the bit the mouth piece attaches to? I know I could go ala' Tom Rose with a large ball valve but how would you whip something on a simple home lathe? Make the cage from PVC and melt a bit of PVC tubing and glue it on? Delrin doesn't glue too well so I am somewhat stumped...

Rob

Rebreathing Red · 18th May 2008, 16:39

I made mine from a solid block of delrin. Here are some picture. I hope they help

cstmwrks · 18th May 2008, 21:36

Quote: (Originally Posted by whoizrob)

When you machine the cage, how did you go about making the bit the mouth piece attaches to? I know I could go ala' Tom Rose with a large ball valve but how would you whip something on a simple home lathe? Make the cage from PVC and melt a bit of PVC tubing and glue it on? Delrin doesn't glue too well so I am somewhat stumped...

Rob

I've made them from PVC and aluminum and the method is the same. While in tube form I just machine off .030 to .045" except for the last 1/8 inch. In other words making all but the last 1/8 of the tube thinner. That becomes the notch that inserts nicely into the inner grove average mouth grip. PVC I heat and bend to look just like the male part of any regulator body at the point you install the mouth grip. Same with aluminum.

Skipbreather · 19th May 2008, 05:22

I molded mine from PVC. Started w/ a 1" (IIRC) fitting and cut off the part I needed. I then cleaned up the bit in the lathe. The mold I made from a nice scrap of oak I had handy. I carefully cut/ filed/ sanded the shape I wanted. I then drilled two long holes for alignment pins (16 penny nails w/ heads cut off). Oak was then cut down the center & pins installed into one side. Round bit heated w/ heat gun till slightly squishy. Put into open mold then mold closed in vice. Cooled part bonded into PVC body w/ 3M ScotchWeld 2216. Mouth bite is Poseidon.

Ken

jmhardingjr · 19th May 2008, 14:31

Quote: (Originally Posted by Skipbreather)

I molded mine from PVC. Started w/ a 1" (IIRC) fitting and cut off the part I needed. I then cleaned up the bit in the lathe. The mold I made from a nice scrap of oak I had handy. I carefully cut/ filed/ sanded the shape I wanted. I then drilled two long holes for alignment pins (16 penny nails w/ heads cut off). Oak was then cut down the center & pins installed into one side. Round bit heated w/ heat gun till slightly squishy. Put into open mold then mold closed in vice. Cooled part bonded into PVC body w/ 3M ScotchWeld 2216. Mouth bite is Poseidon.

Ken

Beautiful work, Ken. Have some green.

Jay

21st April 2008, 23:20	#1 (permalink)
whoizrob New Member Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Apr 2006 Location: Sacramento Posts: 72	For the machining gurus who've done a DSV... When you machine the cage, how did you go about making the bit the mouth piece attaches to? I know I could go ala' Tom Rose with a large ball valve but how would you whip something on a simple home lathe? Make the cage from PVC and melt a bit of PVC tubing and glue it on? Delrin doesn't glue too well so I am somewhat stumped... Rob
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18th May 2008, 21:36	#3 (permalink)
cstmwrks The old ways still work. Current Rebreather/s: Home Build Other Rebreather/s: Not Bought Yet Home Build Join Date: Sep 2006 Location: Boise Idaho Posts: 237	Re: For the machining gurus who've done a DSV... Quote: (Originally Posted by whoizrob) When you machine the cage, how did you go about making the bit the mouth piece attaches to? I know I could go ala' Tom Rose with a large ball valve but how would you whip something on a simple home lathe? Make the cage from PVC and melt a bit of PVC tubing and glue it on? Delrin doesn't glue too well so I am somewhat stumped... Rob I've made them from PVC and aluminum and the method is the same. While in tube form I just machine off .030 to .045" except for the last 1/8 inch. In other words making all but the last 1/8 of the tube thinner. That becomes the notch that inserts nicely into the inner grove average mouth grip. PVC I heat and bend to look just like the male part of any regulator body at the point you install the mouth grip. Same with aluminum. __________________ Why you ask... well it's not like I have anything better to do.
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19th May 2008, 14:31	#5 (permalink)
jmhardingjr Son of a Sailor Current Rebreather/s: Other CCR Home Build Other Rebreather/s: Other CCR Home Build Join Date: Sep 2005 Location: . . . this one particular harbor . . . Posts: 196	Re: For the machining gurus who've done a DSV... Quote: (Originally Posted by Skipbreather) I molded mine from PVC. Started w/ a 1" (IIRC) fitting and cut off the part I needed. I then cleaned up the bit in the lathe. The mold I made from a nice scrap of oak I had handy. I carefully cut/ filed/ sanded the shape I wanted. I then drilled two long holes for alignment pins (16 penny nails w/ heads cut off). Oak was then cut down the center & pins installed into one side. Round bit heated w/ heat gun till slightly squishy. Put into open mold then mold closed in vice. Cooled part bonded into PVC body w/ 3M ScotchWeld 2216. Mouth bite is Poseidon. Ken Beautiful work, Ken. Have some green. Jay __________________ ". . . the sea's in my veins, my tradition remains, I'm just glad I don't live in a trailer . . ."
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