Speargun Trigger Mechanism – Part 1: The Housing

Speargun Trigger Mechanism – Part 1: The Housing


Hello everybody welcome to my channel a while back i made a video showing how I
made this trigger mechanism prototype for a speargun, at the time
i used aluminum just to speed up all the cutting and drilling the goal was to see all the parts
moving together today I’m gonna make the same trigger
mechanism but using all stainless steel and once is finish will be a full
functional trigger good to be used on any homemade speargun project so let’s start. Got the materials ready to go that´s 2 millimeter thick that for
the housing all stainless steel the tubing is 30x15x1,5 millimeters wall thickness also for the housing this
bar its five millimeters thick will be use
for their sear and the trigger these rods are four and
five millimeters diameter and will be used to
cut the pins that hold everything together inside the housing I already
cut this a square piece with a hacksaw that´s a 65 x 65 x 2 millimeters thick material next i´m gonna glue transfer and drill all these holes with
the four millimeter drill the holes will help the bending
process because this is quite tickets is two millimeters
and without the whole and without any machinery will be very difficult to make such a bend because he will be
like a 90-degree two times and that will be come the housing. With the center punch i´m
going to transfer all these holes so I can drilled with the four millimeter drill got the housing plate set up on the
drill press machine with a 4 millimeter drill I’m gonna
start drilling all of these holes I drilled the first nine holes so I’m gonna move to the next row and drill nine more and the last one a little bit of oil lifting the drill to break the chips, and we are
done there’s the holes all drilled out this site doesn’t look too bad the back
side there’s a different story this stainless steel is quite something is a
very gummy material tough to drill so now I
have these big tall burrs and the plane
here is to use a shamfering tool I´m gonna try this one and go on every single hole and make a small
shamfer and hopefully this will cleanup the burrs
and look good there’s my small drill press
machine all set up to shamfer those four millimeter holes to remove the burrs actual have the X&Y cross table mounted on it and sometimes I
use this setup as a milling machine machine okay all done there’s a housing plate
ready for bending after the shamfering I polish it up a
little bit with some sandpaper on the inside with a scriber I made a
couple of lines along the holes and these will be guidelines for
bending clumped the housing plate plate on this vice put some masking tape on it to protect it
so it doesn’t scratch it too much now I have do more clamps holding the housing plate against this bar and next I’m gonna start moving everything together this way very happy with the results so far I still have one more bend to do but
everything looks very good the inside it’s very clean very sharp
down here and on the top this radius it’s not too
big either to make the second bend I’m going to used this nine millimeter
thick plate clamp everything together on the vice
and then bend this side down to create a housing on the belt sander I’m gonna grind all the same square to each other and
down to the final size which is 65 by 30 millimetres check this out I just have a word to describe this
beautiful and you know what these holes on the top
they just look amazing it reminds me of a muffler from a racing
car I think this is gonna be like the coolest looking trigger mechanism on YouTube you ther´s a much easier way to make and
trigger housing from this square tubing 30×15 by one-and-a-half milliliters wall
thickness I cut off of a piece and they end up with something like this on this one a left this tab to doesn’t
do anything just looks I may put a screw hole on the top and once i transfer and drill all the
holes for the pins I just have to cut the bottom of file everything down get everything on
size and the housing is done, Before I
transfer and drill all of these holes i want to explain something all the holes are drilled through both
walls except this one it’s a viewing port to look into the mechanism, wants the
trigger and the sear are engaged I can look through and if there’s any
mismatch I can be adjusted as needed. iI cutted
this piece of wood once I slide it inside the house it
will prevent the walls from collapsing when I center punch all of the holes and will keep the drill
perpendicular to both walls specially when it starts to drill the
bottom side to preventing drilling holes over size i´ll use three drills for each hole I have a
2,5 mm 3,8 and 4mm drill for the 4mm hole and I’ll
use 2,5 mill 4,8 and
5mm drill to drill the 5mm holes holes 3,8mm drill and the last drill its 4 millimeters I’m checking the hole size with a 4mm pin, it’s pretty good it’s actually a press fit the slightly
press fit and this way the pin 2 will stay in place
all the time I finish drilling and chamfering all the holes now with a hacksaw I’ll cut off the bottom side trigger housing almost finished.
while I was filing those steps down I thought that it may be a good thing to
have those steps there it will make a much stronger wall and next time instead of cutting off the
whole bottom I’m gonna leave a little bit of material right in the middle like a bridge connecting the two walls
and that will prevent the walls from flexing, because right now they are flexing a
little bit not much and that will make a much stronger
trigger housing for now there’s only one thing left to
do I’m gonna jewel the whole thing side stop and I think
it’s gonna look just amazing to make their jewels I´m using at 6
millimeters abrasive rod I´ll move 3 millimeters and hold it for about 3 seconds move 3mm, hold it for 3 seconds finished the housings and they’re looking just amazing check
this out and this one the jewels it was that extra step but want a difference it made, now it’s time to
start working on the sear the trigger put the whole
thing together and we got the trigger mechanism done.
Let´s go!

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