How to CNC a Bowl - Two Sided CNC Machining - "The Shallow Flow Bowl" - Fusion 360 File Available!

hey guys Corbin here I designed this shallow flow Bowl in Fusion 360 and developed a whole new way to do two side Machining one way to do two side Machining is to create tabs around your work piece and cut it out afterwards this works best for things that are about an inch and a quarter tall any deeper than that and you start to deal with cut or high collisions or colliding with your collet I'll talk a little bit more about this in the next video and how to solve and work around some of those issues but let me focus on my new idea here so my plan is to machine all the outside area on the bottom of a bowl first and then flip it over and do the inside but the trick is how do I align it for that second operation so I designed a small jig to do this I modeled this up in Fusion 360 which is just the bottom shape of the bowl cut out of a three-quarter inch piece of wood or in this case MDF I could then drill some quarter inch holes in my jig to align it to a mini spoil board that I can use some dowels to mount it precisely onto the main spoiler board and attach that to my main CNC table notice the spacer in front of my work piece this is just a two inch piece of MDF to give it a slight offset so I have somewhere to clamp down on my main CNC table so I've started holding down my work pieces with double-sided tape but there are some tricks to get a good hold with the tape I cover my entire work piece with it and scrape it really down with a piece of wood before removing the backing and that seems really important I'm putting the tape on a piece of mail of mine but I have also used MDF too I've been trying mail of mine because I noticed that MDF would sometimes pull a little bit off each time I remove the tape and I want to reuse The Jig again and again however I found that melamine does tend to pull up too so you could probably use whichever one you want now the second trick to getting a good hold with double-sided tape is to squish it down with some clamps I found that I will get pull up with some aggressive Machining unless I actually go and do this and this is one of the main reasons that I don't attach it directly to my main CNC spoil board because I need some way to add the clamp pressure so I'm just using the clamps to get good adhesion I clamp it down and then as soon as I clamp it down I immediately remove the clamps I take my work piece and the small spoil board over to my CNC table and clamp it down the little black dogs give me a precise location for repeating this bowl again and again the origin for the first Machining operation is the bottom left corner of the stock the Z needs to be accurately located but the X and Y doesn't have to be 100 spot on I use a 3 8 of an inch spiral up cut bit to remove most of the waste and do a 3D adaptive clearing infusion 360. then I go back and do a finishing pass with a quarter inch ball nose bit I use four of my 3D printed clamps to attach the mini spoil board down to my main CNC table using the t-track system I removed the work piece from my CNC table and use some small wedges to actually get off so this jig only has to be made once and then I can repeat this bull project as many times as I want without having to make it again I cut out a piece of MDF for The Jig and a piece of mail of mine for my mini spoil board but they could both be made out of the same material and it doesn't really matter I don't have any video of me Machining The Jig so here's the simulation in Fusion 360 and what I did I first made the mini spoil board drilling some holes entirely through the work piece and also into my main CNC table spoil board this will allow me to realign it precisely I cut some quarter inch round steel dowels to about an inch and a half in length with dowels would work too but I found they get beat up after multiple uses and I wanted to make this bowl a bunch of times and the steel is just a lot more durable I set the mini spoil board on some pieces of wood so I can more easily clamp it I like to wipe down my work piece and the spoil board with a little bit of acetone to get off any dust and oil I use the jig as a template to Mark the location of the board with a pencil I covered that up with double side tape and scrape it down really well before removing the backing the steel lemon dowels can then be installed and on the first use it's good to chamfer the holes just a touch to prevent any blowout I make sure they go a touch below the bottom mini spoil board as those will be used for alignment on the CNC table itself The Jig goes on the top of the dowels but I space it a tiny bit away from the tape I carefully set my work piece Into The Jig and clamp it down clamping is essential to get good adhesion with the double-sided tape but I can remove the tape right away because I don't have to wait for any glue to cure the spoil board holes now align with the jig perfectly to get me precise alignment I use four of my 3D printed clamps these work really well and you can print some of your own at home I'll drop a link in the description on where you can get the files I machine the inside of the bowl using the same techniques as the outside I use a 3 8 of an inch spiral up cut bit to get most of the waste out with the roughing operation the upcut is essential to get the chips out of the bowl I then follow up with a quarter inch ball nose bit for the finishing operation once everything was done I could remove it from the table I find it easiest to First pound out the dowels and then I can use the wedges to separate the work piece from The Jig foreign to remove the Machining marks I usually start with 150 remove most of the marks and then follow up with 220. I prefer osmo top oil for most my bowls it's food safe super easy to apply I just wipe some on and then I wipe off the excess let it dry about eight hours and then I put on a total of three maybe four coats depending on the shine that I kind of want so here it is I made several different versions of spool using different woods and this is how they came out [Music] [Applause] [Music]

Channel: Corbin Dunn

Views: 7,434

Keywords: CNC, CNC Woodworking, CNC Router, CNC machining, how to make a CNC bowl, CNC bowl, CNC Bowl design, CNC Fusion 360 Bowl, How to CNC Bowl, two sided maching, 2 sided machining, Vectric, VCarve, Fusion 360, CNC Bowl, CNC bowl design, CNC bowl ideas, CNC ideas, CNC project, free CNC ideas, CNC designs, CNC that sells, CNC router, CNC router bowl, CNC tips, CNC hold down, wood bowl, how to make bowl, how to machine bowl

Id: Doy0JwG77Kk

Length: 7min 35sec (455 seconds)

Published: Fri Jun 16 2023