iointerrupt
Contributor
ScubaPro specifies that after tuning, one should be able to press the purge button a distance of 2mm, without any leakage. This seems like a rather important specification, as it puts an upper-bound on the lever height.
Nevertheless, it doesn't seem to get much discussion, in the few service manuals I have, it's only even mentioned in the G260 manual.
Are people just eyeballing this, and leaving some amount of play in the purge button? Tuning with the purge button pressed in a bit?
Thinking about it a, I figured it wouldn't be that hard to make a gauge. So I machined up a chunk of aluminum with a 2mm step in it:
When pressed again the face of a regulator, it should ideally press the purge button exactly 2mm (assuming the purge button and case face are co-planer, at least).
Then going a bit further, I figured I could just tune the regulator while pressing the regulator against the gauge. Real easy to adjust the lever height to it's maximum leak-free height, then set the cracking effort via the micro-adjust screw.
Finally, picking the regulator off the gauge, it has exactly 2mm of travel on the purge button before it starts to leak, and the lever height is as high as it can be.
In the end this almost feels too easy, is there something obvious I'm missing?
Nevertheless, it doesn't seem to get much discussion, in the few service manuals I have, it's only even mentioned in the G260 manual.
Are people just eyeballing this, and leaving some amount of play in the purge button? Tuning with the purge button pressed in a bit?
Thinking about it a, I figured it wouldn't be that hard to make a gauge. So I machined up a chunk of aluminum with a 2mm step in it:
When pressed again the face of a regulator, it should ideally press the purge button exactly 2mm (assuming the purge button and case face are co-planer, at least).
Then going a bit further, I figured I could just tune the regulator while pressing the regulator against the gauge. Real easy to adjust the lever height to it's maximum leak-free height, then set the cracking effort via the micro-adjust screw.
Finally, picking the regulator off the gauge, it has exactly 2mm of travel on the purge button before it starts to leak, and the lever height is as high as it can be.
In the end this almost feels too easy, is there something obvious I'm missing?
