Simple Crossbow Trigger Mechanism

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This is a simple guide on how to build to effective and simple crossbow trigger.

Step 1:

When I was first thinking about building my crossbow, the hardest part was trying to figure out a trigger. Now there is lots of designs for triggers like the one above but it is fairly complicated to fabricate and requires many moving parts. Not to mention that these components would have to be precise to get a nice smooth release every time from the trigger. I even looked up other designs on instructables and they all used variations of this more complicated design. My design is a bit more crude but works just a well and is very reliable.

Step 2:

The bow string is pulled back and notched onto two finishing nails. Theses nails were filed down smooth to reduce the wear on the bowstring. Two wood blocks are attached on each side of the stock by a long bolt and nut. A third block is attached to the bottom to connect to the first two blocks together. This allows the blocks to rotate up and down. The metal trigger is optional. It allows me activate the crossbow while keeping my hand on the grip. When the trigger is squeezed, the woods blocks push the bow string off of the nails and the arrows is released. The curved piece of metal is designed to hold the arrow in place.

Watch the video to understand how to trigger works.

Thanks for reading! I hope this helped someone that was planning to build a crossbow. Have Questions?Please ask.

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6 Discussions

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peter---peter

1 year ago

very nice.

I'm planning on building a crossbow, what can you recommend to use as limbs for the crossbow?

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Very good! I am trying to make a crossbow and couldn't figure out how to make the trigger. This is probably the only simple and good trigger on the site! Good job!

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NiltaDigital Flame

Reply 3 years ago on Introduction

Having one would be nice to push back the trigger, but alas I was to lazy to implement one because it only takes about a second to push back manually.

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Digital FlameNilta

Reply 3 years ago on Introduction

Ah, ok, it is interesting to see that it is not essential! I guess that makes the mechanism very sturdy and durable.