Two Sided 3D Milling using Pin Method. CAD and CAM in Fusion 360
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- Опубликовано: 21 окт 2016
- For another project, I need to do two sided milling with my Stainless OX CNC. This is my first attempt to setup CAM for this type of operation. The part I'm milling has surfaces on both sides and can only be milled from two sides. Another reason, for using two sided milling, can be if the part is tall and e.g. a profile tool path then will go deeper than the length of the milling bit.
Both CAD and CAM are done in Fusion 360. Three files were generated one for the pins, one for the top face and one for the bottom.
The Fusion360 file CAD/CAM and be found here: a360.co/2rau2HZ
Shop parts for Stainless OX at makersupplies.dk 
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Great video!! I'm new to the CNC world and just starting with 2 sided milling and you made this perfectly clear. Thank you so much!!!
Thank you Martin! This video goes to show how knowledgeable you are. While you were explaining the holes for the pegs I didn't understand until you started with the actual cut but this is brilliant and I'll be using it in the future!
Also, love the action music once the milling starts haha!
Thank you so much!!! A really great video. I'm really grateful to you and others like you who take the time to share your knowlede and great ideas!
Your music is hilarious - oh the suspense! Also thanks for the video. Very helpful.
Thank you very much for this very well video, your Fusion 360 explanations was very usefull for me.
Nice one Martin, was looking for someone to explain this method.
Very informative! I probably would not have smacked the spoil board and job with a mallet a bunch of times for fear of moving the waste board. One of the hold downs was loose at this point and I'm amazed that nothing moved.
just what i needed, cheers
OH boy, 1 month too late. I just worked through this on my project! One thing the other tutorials and video's don't show is how to do the CAM for tooling holes. I had to figure this one out myself. You make it look easy! Thanks for sharing. Many people will benefit from it.
I'm still stuck trying to drill the holes. I am doing the drilling operation in Fusion but so far I can't get it to generate a tool path no matter how much I play with the parameters. :(
Thank you for making this video.
Thanks for the video. I've done two-sided work before, but not yet with Fusion 360. I used steel pins instead of wood dowels, but the wood dowels would be safer in case of the bit accidentally hitting them. Always more to learn.
Thanks! - and yes, running into the wood dowels may damage the project but the bit will survive :-)
Thank you!! Amazing how many 2 sided CNC videos DON'T talk at all about the software side of things.
Great idea, thanks!
thanks for the tutorial
Thanks for explaining. I am still a bit reluctant to learn fusion 360 but I might not have a choice.
Educating Savvas I agree that the learning curve is steeper than for other programs like Sketchup or VCarve. However, it's free for hobbyists (hard to beat) and you can do most of the complex operations.
Sorry for being direct but you left out what is arguably the most important steps (what I was looking for); how did you set your work coordinate system? what did you use as your origin point, was that the same point on both sides? what settings did you use in Fusion 360 to get the Z to go in the right direction after flipping the part etc. I'm not even sure what the point of the pins where if you didn't even use them to reference your stock when you milled the first top half...
I think the key is that one of your setup axes is on the center line between the cylinders. Since he doesn't ever change the x and y zero, that line didn't move. I think his origin is in the center of the stock, on the surface. Same for the second side. Be sure your stock in fusion matches the thickness of your material. Other two don't matter much.
I find getting the axes right easiest if I flip the work piece in fusion the same way I would in real life. Then choose the origin and axes.
Hope this helps. Maybe one day i will record a fusion session and post it.
Hi Martin. Thanks for the video. One thing that would be useful - if you could show us how you setup the toolpaths for the rapid drilling out of the two dowel holes. I cannot seem to get this to generate toolpaths. Are you using the face of the cylinders?
Hi Matt. You have to make a separate G-code file for the two holes. First you run it on the spoil board and then again on the work piece. Then mill the upper part (2nd G-code file) without moving the work piece. When finished flip, mount the dowels and run lower side (3rd file).
Dear friend. Thank you so much for the video. Any recommendations on zeroing X and Y? Should they be the same for both sides?
In this project I used the same and probably it will work for most projects. However, I do not see that it's a must. If you e.g. has a project with an irregular shape you may decide to have zero at different places.
How do you configure the Work Coordinate System for the two Setups? Is there any chance you could share files for this design? I tried this technique, but couldn't figure out how to align the top and the bottom in CAM. Thank you!
You can find the Fusion360 design with both CAD and CAM here: a360.co/2rau2HZ
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how do you drill where the dowel is at?
is there an easy way to make the cylinders in fusion 360 so that they are symmetrical to the stock and will enable easy flipping?
Not entirely sure. How about a center line through the stock and then apply mirror constraint to the circles?
hey Martin thanks for posting this as its very helpful for the project I'm doing at the moment. I'm stuck 0n one part in the cad cam. you put in two cylinders to use as pin holes. how do you drill them out. thanks in advance
I made a separate file with only g-code for the two holes. I use a 6mm bit and the dowel pins are 6mm. First milling the holes in the spoil board and the in the first side on the work piece material.
I understand what you are saying but I'm stuck at generating the tool path. I select the face of the cylinders but it wont drill them out. I think they are recognized as an object an not holes. it just says failure to generate tool path.
Are you selecting the bottom of the hole as geometry? Try also to "simulate" using a smaller bit just to see if it could be something with collision
Great video, Martin. I'm trying to work through this but unfortunately can't get Fusion to drill the holes. I've tried with cylinders that are taller than the stock and not as tall as the stock, using the drilling operation with bits the same size as the hole and also smaller, and trying to change the top and bottom planes, but so far nothing I do gets it to generate a drilling tool path. How do I tell Fusion that the two pin columns are not columns that should be left but instead are holes to drill from the stock? Thanks for your help!
Update - I got it to work by deleting the cylinder bodies (where I basically extruded the circles) and instead just selected the sketch of the circle and adjusted the heights to stock top and bottom. I'm not sure why it won't work if I select the circle face of the cylinder I made, but glad its working.
I can't wrap around my head around it. How can I visualize the three operations in the same process?
In words the steps are the following: 1) Drill holes for dowel pine in spoil board 2) Fix the block of wood and drill the same holes here. Remember to re-zero on the top 3)Mill top side down to a depth that allow you to mill the rest from the other side (how deep depends on the shape) 4) flip part and align using dowel pins in the pre drilled holes 5) mill the last side
One question, though. Why did you drill the underboard (white board) with two holes first? Why not drill through both the stock and the underboard at the same time?
Hi Dave. Thanks for the encouragement! If the stock is not very thick you can drill all the way through in one go. With the piece I made here I think I could have done it. However, one of the benefits of two sided milling is that you can mill objects that are thicker than you can mill in conventional manner due to bit length. So here you need to do first the base holes and then the holes in the top side for later being able to flip the part.
Thanks for the reply, Martin. That was my best guess so good to know I'm on the right track...
How would create two setups to accurately mill two adjoining faces? Is there a "pin method" fr this as well?
Yes, I would think so. The pin method allow for precise placement - so I see no reason for not being able to use it for that.
It's not clear from the CAD-part that (or if?) the 2 pin-holes are placed in a symmetric manner (equal distance from the center of the part and placed on th ecenter line of the part), but the video is much better than nothing :)
It is most easy to place the holes in the center as it flips over directly. However, if you need more support you can place 4, 6 or more symmetrically around the centerline
how did you add tabs?
They're in 2D Contour only
What 3D mouse are you using ?
I have a 3D Connexion Space Mouse and I'm really happy with it. Works w Fusion 360 and Sketchup (plus more)
Space mouse is a game changer. Worth every penny. I just use the simplest one.
The only thing I wanted to know was how to tell F360 that one job is upside down.... you seem to have completely skipped the creation of the jobs that people will be interested in, and only showed the end result.