CNC Fundamentals - Ep. 2 - How Machine Side the Bottom Side

hey hey guys jay here welcome back many of you who watched the very first episode in the cnc fundamentals course the cnc milling machine overview or the cnc mailing overview reached out you said hey man you showed us how to do the top side but how do you do the bottom side so in the first episode we made this part right here and we just went around the top we did the pocket we did the chamfer but people want to know how do you take this and turn it into this the actual finished part so in this video i'm going to show you guys exactly how to do that so let's head out over to the machine okay so you guys can see that we're looking directly down on the vise from a side view i just have my cell phone of all things sitting on a tripod and we pulled the stepped jaws that i like so much i love using those dovetail jaws because they hold onto the material so well but we're pulling those out we're putting standard jaws in and then we're going to put some parallels in and the parallels allow the part to ride up off the bed of the vise so that we can access the top of the part normally you would hold the parallels in or you could hold the parallels and there's a lot of different ways to do it you can use rubber bands like i did right here but they ended up snapping which was kind of a mess and i couldn't help but laugh and so i grabbed out one of my uh one of my gadgets i guess they're called parallel keepers and it's a spring-loaded parallel keeper it's pretty trick i don't remember where i bought it but if you guys are interested you can just google whatever the you know use google whatever it's called but you get your part in there and you'll see that what we do is i end up putting a one two three block what's useful here is that we need to let the machine know where the work is so we set our work origin at the bottom of the part and at the back left corner so we choose you know the x surface and then the y surface then of course the bottom of that part and so how do we do this how do we let the machine know where the part is if we put a one two three block in the vise and then we probe the top of that one two three block we know that we're exactly one inch above our our part above the bottom of our part or above that location so we probe the top of the one two three block then we probe the left side for the x location the back of the one two three block for the y location and then when we go into our work offsets page and whatever machine you have you then set the work offset at the top of the one two three block and you subtract out one inch and then you're exactly where you need to be using the heimer 3d tester so so it's it's pretty straightforward and and that's how you do it it's not super difficult but every part is a little different sometimes some parts you don't need to do this sometimes you can just calculate it if you have a precision ground piece of material like if we would have had this piece of material but we knew it let's say it was exactly uh one and a half inches thick exactly like precision ground within a thousandth well then you might not even need to do that if you knew that you cut exactly a half inch down on your first operation when you flipped it over you could have just probed the top and you knew that you'd have to cut down exactly one inch because these are exactly a half an inch about 13 millimeters thick so that's how it goes so really what we're doing is we're making sure that the machine knows where the work is so that we can cut it cut the part so that we can program the machine to cut the part now if for whatever reason you measure the part and it's too thick you can change there's a couple of ways you can fix this you can go into your tool page and you can change the wear offset for length and you can just say minus uh let's just say that you cut the part and it was three or four thousands too thick you could go into your tool offset page and you'd find that your finishing tool in this case would be our face mill which was tool number one and we would just say uh minus three thousandths so if you're three thousands too thick you go into the where length and you hit minus three thousands you enter that in and then when you take the cut again the machine will adjust the depth of that cut to bring you apart on size and you can do this also for the wear diameter we'll talk about that in future upcoming videos so hope this made sense hope you guys enjoyed this we'll see in the next one bye-bye [Music] [Music] [Music] oh [Music] foreign um [Applause] [Music] so [Music] so [Music] uh [Music] you

Channel: Nerdly

Views: 32,607

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Id: SGNoOIg1AV4

Length: 8min 1sec (481 seconds)

Published: Thu Jul 22 2021