Power capacity of trigger mechs?

If the shaft prefires you have too much rubber on:D

Sorry I can't help with the euro mate, and you probably want to do a nondestructive test.:D

Cheers, Don

Just out of curiosity what do you plan to do with this knowledge? 6 band euro

RA mechs/spearguns have been known to misfire with just two 16mm bands. I witnessed it once, and was told about other times. It's a plastic mech. I was wondering the same thing as Jarey.

Aimrite used to have a video somewhere on speargun trigger testing. He had a tool that would apply pressure and measure the pressure. His Euro Mechs were tested to 600 lbs (Ithink) The American mechs on the Wongs were tested to 900 lbs (I think) You could find the video on Youtube. They use to test every trigger before final assymbley. Not a bad idea for a Speargun Maker or Trigger Maker.

Lunker Buster, we can cycle your trigger in this one me and my friend built 20 years ago, and I can promise the plastic bits will get recycled into picnic forks and spoons. :D;)

Me and my buddy John go by the rule ''Expect what you inspect'' You should hear the noise this baby makes when cycled at 1000 lbs.

Cheers, Don

I remeber APNEA mag having a test of most of the euro trig mechs, dont remember very well the
holding capacities, but most would not recomed anything over a tight thick band (20mm) ,
and few some handle 3 thin ones.
Also remember that as guns age, those numbers would get lower and lower.

Quote from Don Paul

Lunker Buster, we can cycle your trigger in this one me and my friend built 20 years ago, and I can promise the plastic bits will get recycled into picnic forks and spoons. :D;)

Me and my buddy John go by the rule ''Expect what you inspect'' You should hear the noise this baby makes when cycled at 1000 lbs.

Cheers, Don

Not to derail the thread, Don, but could you explain how it works, how you calibrate it, and maybe show a few more pics? Maybe a separate thread or a PM would be more appropriate so as not to derail this one. Thanks!

There is something else, some triger mecs could handle a lot of power, but if you try to pull the triger at some load, they would not fire.

Quote from Wood Guy

Not to derail the thread, Don, but could you explain how it works, how you calibrate it, and maybe show a few more pics? Maybe a separate thread or a PM would be more appropriate so as not to derail this one. Thanks!

Here is the sketch, I plotted and calibrated the Chevy big block valve springs on a bench spring tester.
The rig could do a max of 1600 lbs, we used a spring scale to measure trigger pull. The nut on the end can be set for the test poundage.( KIDS these destructive testers can cause injury or death if safety procedures are not followed.) Wood I'll PM you after work tonight.

Cheers, Don

Don, so good to have you here,
its being said that the Devil knows more because of his age, that because he is the Devil,

Quote from Roberto Reyes

Don, so good to have you here,
its being said that the Devil knows more because of his age, that because he is the Devil,

Great to have you here too Roberto, thanks,
:laughing3::laughing3: I gave testing up for lent.:D;)

Cheers, Don

Lunker: A speargun must be used for what it was designed.

A RA is a great gun with 2 x 16 mm bands. You could also use it with a single 20 mm.
If you need more power, you can always shorten the bands until you can load them. I have NEVER had a problem with a RA. The only gun I had that missfired was a SS mech lifetime warranty...

If you flod the gun, it will be a nightmare to hold it in the water. I don't recommend that.

2 x 20 is too much for the gun, for the shaft and for your wrist. You wont hit a whale!

Some time ago, I changed the setup of my first wooden gun and bought a heavier shaft and changed the bands from 3 x 5/8" to 3 x 3/4". That gun used to shoot like a dream but became a nightmare...

Keep it simple.

Quote from Marco

Lunker: A speargun must be used for what it was designed.

A RA is a great gun with 2 x 16 mm bands. You could also use it with a single 20 mm.
If you need more power, you can always shorten the bands until you can load them. I have NEVER had a problem with a RA. The only gun I had that missfired was a SS mech lifetime warranty...

If you flod the gun, it will be a nightmare to hold it in the water. I don't recommend that.

2 x 20 is too much for the gun, for the shaft and for your wrist. You wont hit a whale!

Some time ago, I changed the setup of my first wooden gun and bought a heavier shaft and changed the bands from 3 x 5/8" to 3 x 3/4". That gun used to shoot like a dream but became a nightmare...

Keep it simple.

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What he said.

Quote from Roberto Reyes

There is something else, some triger mecs could handle a lot of power, but if you try to pull the triger at some load, they would not fire.

bill kitto has been designing and refining mechs for quite awhile now, and while he always tests for max lbs pressure, another thing he does is to test what pressure (in lbs.) you need to actually pull the trigger.

it's my understanding that he supplies all the trigger mechs for the new JBL guns.

i'll try to find the link for some tests that he's done through the years.

I did not wanted to mention brands, but exactly, one of the Trigger mechs that could handle lots of loads was JBL, but you would need an 800 pound gorilla to pull the trigger on them.

I remember modifying my Voit/JBl shafts and using 6(soft) bands on them, trigger would not
shoot by itself, but it was a pain to shoot because of the trigger pressure.

New JBLs uses kitto mech and they are really soft, some of them hair soft.

Tests are on Kittos webpages.