My 15 guage finish nailer some times fires twice with one trigger pull. It has a full sequential fireing system with no bump fire option. It is not shooting two nails at once, there are two distinct fires. It almost seems like what ever makes it fire is to sensitve and slightest pressure change on the trigger causes it to fire again. Can you tell me if there is a fix for this?
There is one main part that can be the cause of the problem.
The trigger. Check to see if there is anything out of the ordinary with this. There should be some moving components attached to the trigger itself. Is any part of the trigger touching the button in the body of the gun when safety is not depressed. If the lever on the trigger is pushing on the button, even a little bit, It will allow the gun to fire again and again.
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what do you mean fires two at one time or two like bam bam.? different things all together. two at one time is the nose piece and normally occurs on coil nailers when they wear out. If its bam bam then, yout trigger is black and its called a contact tip trigger, meaning as long as the safety is pressed down and the trigger is held it will fire. But common problem is when people use a gun and put it on the board and pull the trigger. Like any gun there is a " kick" the kick is the operation of air going through the gun hitting the piston which is attached to the driver, pushing the nail into the board, ( a lot of energy directed straight down) pushing the gun up. and the trigger while released actually is making you pull it twice. So, as a tech I teach new people that there is a sequential trigger that does not do that or if your good with your aim try holding the trigger and tapping the board a single time.
but long and short of it, nose worn ( pricey) or trigger
Double fire is usually caused by trying to use a bump fire trigger system as single fire (place on work then pull trigger). If however the gun double fires when bump firing, replace the trigger valve. Some nailers have the ability to select bump or single fire. The selector for bump or single fire is usually on the trigger or just above or below the safety actuator. Other brands offer different triggers available as a part number.
When trying to determine what nail to use, look for the model number of the nailer. Letters associated with the model number will give you a clue. Example; the letters RN in the model number indicates Round head Nail. The angle of the nail is easy to determine. Just measure the angle formed by the path of the driver and any straight line of the rails.
We often see jamming with stainless wire collation - the problem is almost never the gun, it is because the stainless wire is much harder to shear off than regular steel. I would suggest trying another brand of nail and see if that helps.
Also, yes, the trigger is all that is required to change it to sequential, it is a very easy swap.
Most nailers have a two position setting on the trigger to allow for single fire or bump fire. If set on bump fire, the gun will work better when you bump fire the gun instead of placing the gun on the work then depress trigger. Bump fire works best when safety spring has good tension. Easy test. Make sure that the safety spring is in place (with air hose removed, contact foot should spring back quickly when pushed against work). With air connected, hold trigger and quickly bounce the gun against the work. If the gun does not fire when you bump, the trigger is most likely set to single fire. With trigger set to single fire, you must place the gun against the work, then depress trigger. If the gun shoots two nails while set to single fire, most likely worn trigger or worn out trigger valve. These parts are not expensive and are easy to replace. Good luck
Assuming that you are using the correct nails. This will usually happen if you have bump-fire trigger and are trying to place the gun on the work then pull trigger. Replace the safety spring if weak and bump-fire only (spring should be very firm). If you have single fire trigger, replace the trigger and the trigger valve for good operation. If you have always been bump-firing and now double firing, replace the safety spring and trigger orings. Good luck
Worn trigger valve orings will cause gun to fire twice, and /or attempting to single fire nail with bump-fire trigger. Easy test, look closely at firing pin under trigger. It should fit snuggly an not move from side to side in valve. If loose, replace valve. If your nailer has bump-fire trigger, do no attempt to place gun then fire one shot because the gun will most likely double fire. Good luck.
Best practice is to bump fire the gun to prevent double fire. Do not place the gun on the work and pull the trigger. This takes practice while using at an angle. Works better if the nose piece has rather sharp points to help nose to stay in postion while you bump. With trigger depressed, practice without nails bumping/hitting wood at different angles untill you can bump hit at the spot that you need the fastener. If the gun double fires while bump-firing, most likely all the safety/trip parts are worn/loose. Not expensive to replace. Good luck.
Many modern brad and finish nails use a sequential fire trigger system. You have to push the nose of the tool down to depress the safety THEN pull the trigger. This is the opposite of how a bottom fire works where you hold the trigger and bump the nose to fire the gun.
Professional-grade varieties are automatic, and fire a nail directly upon pulling the trigger. A semi-automatic nail gun is more appropriate for beginners, since it requires a two step process: pull the trigger and then tap the barrel against the wood. This safety feature protects the user from accidentally firing a nail gun and injuring himself or others.