Fill Witness Mark with airSlate SignNow

Integrate mark witness

[Music] we wanted to talk today about the concept of a witness mark when you're running a forming tool oftentimes when you're talking to us at wilson tool we will mention the concept of a witness mark and it's if you don't know what it is it's kind of hard to envision what that is so let's look at that here we have an extrusion tool is run this one shows a quite pronounced witness mark this one shows no witness mark at all so we would say that you always want to see with with a forming tool somewhat of a witness mark this is a little on the heavy side but i still i can't feel that with my fingernail it's not a depression in the material it's just kind of a little bit too much but it it does a good job of showing the idea so what happens here is when the extrusion tool is stroked all the way the cap comes down and hits that those two surfaces touch the tool can't travel anymore and now we start to build some pressure up on the surface of the metal and that's where that witness mark comes from because the face of the punch starts to press against the cap of the die cap you start to get some compression in there and that creates that witness mark or that pressure mark on the metal so we have some other examples here here's another forming tool a much smaller gap in the die cap but you can see again that's how far that die cap can travel once it gets that far it stops traveling and we start to get pressure on the surface of the metal so here's what that looks like with a simple lance and form bridge lance and form we could see the exact shape of that punch and if we flip it over on the back side we can see the shape and size of the die cap so that tells us that we have definitely stroked the tool all the way and we're creating the form that the tool was designed to make if you if you don't see the witness mark you may not be traveling far enough and if you're if you're not getting the results that you want from your form that may be why so here's an example with a simple half shear tool pretty hard to see much on the face of this but if we turn it over we do see a little bit of a witness mark around a little halo around those again with the electrical knockout you can see a little bit you maybe can't see it in the video but i can just see it if i turn it over it's considerably easier to see this one on the back side so that's what we're looking at and what we're talking about when we say a witness mark on a...