dan
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Posts: 6 
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Post by dan on Mar 22, 2017 8:06:37 GMT -5
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Post by unclejohnaudio on Mar 23, 2017 6:40:16 GMT -5
Dan,
I am guessing that you are talking about take the sheet in the last picture, turning it over and doing the round over on those pieces? While it is do able, I would think it could be done much faster on a router table with a bearing guided round over bit. Being said...
You can use layers for this.
1.Create a new layer called "backside"
2.Select all of the vectors
3.Click mirror selected objects (under transform objects)
4.Check the box "flip about job center", then "Flip Horizontal" button.
5.With all new vectors selected, right click and move to "backside" layer
6.Once happy with that, you could export the code files into two programs.
That is how I would attempt what you are talking about doing.
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Post by stevem on Mar 24, 2017 10:06:03 GMT -5
Dan:
I have a friend that also makes chairs out of plastic.
He usually cuts out several parts at once on the CNC machine, but does the round over on the parts on a router table.
I have watched him do it and it's a very fast process with a router table.
The neat thing about the plastic is no dust, just small plastic chips and the finish product looks great.
While the CNC machine is cutting out the pieces, he is at the router table rounding over the edges.
He said he first tried to do what you want to do and said it was faster with two machines.
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Deleted
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Post by Deleted on Mar 24, 2017 11:24:07 GMT -5
I'd have to agree that rounding over the back side might be easier with a router table if you have one. Another advantage of doing it that way is if you use a round over bit with a follower bearing then you can also use it to take off your tabs if that's how you're holding the parts to your workpiece. It can also save you time, while one sheet is machining you could be cutting out the previous pieces from the offcut and rounding over on your router table.
If you want to do it all on the CNC then two sided machining is the way to go. Vectric has some great videos on that subject and I've posted here on it. I find that registration when flipping is easier if you use hardened precision dowel pins ($10-15 for 50 or 100). For doing this larger stuff you might want to use 0.250" ones but I use both 0.25" and 0.125". You can either place them in the offcut or if you can work them into your design then within each final piece. You'll have to take the pins out of the spoil board for the first side, do your first side machining including dowel pin holes, insert the pins in the spoil board and flip and clamp the workpiece and then machine your second side. I do a lot of machining with dowel pins, it's quite easy, the important thing is to undersize machine the holes, that is, for a 0.25" hole don't use a 0.25 bit, use something smaller and mill the hole 0.249" with a rough and final pass of 0.01" so its a nice tight fit on the pin. When I use 0.125" pins I use a 0.093" bit to make a 0.124" hole. Also, pry the pins out at an angle, make sure it's a vertical pull.
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dan
New Member
Posts: 6
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Post by dan on Mar 27, 2017 9:41:10 GMT -5
Thanks for the help. I do have a router table so I'll go that way.
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Post by heartfeltrustics on Apr 5, 2017 16:37:56 GMT -5
About a week ago I received my AR8 Pro. I'm brand new to CNC and CAD/Vectric software. After watching many tutorials on the Vectrc site and having 3 friends help me lift the monster onto the accessory stand I tried it out this weekend. Project 1 is a simple sign to make sure it worked, Project 2 is a 3D plaque just because and Project 3 is why I bought the machine to begin with. At least that's what I told my wife. I make Adirondack Chairs and I was hoping this would save me time and money. Project 3 is my test pattern on MDF 2'x4'. The plastic wood sheets 4'x8' come in today and I'll post a pick when I assemble the first chair. The only thing I'm having trouble with is how to do a round over on two opposite sides of a rectangle. What video would help me with this? View AttachmentView AttachmentView Attachment |
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Post by heartfeltrustics on Apr 5, 2017 16:38:56 GMT -5
Very nice work. What bits where used for the fish plaque? Thank yiu
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Post by traindriver on Apr 8, 2017 20:11:41 GMT -5
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dan
New Member
Posts: 6
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Post by dan on Apr 11, 2017 8:56:55 GMT -5
Sorry for the slow response my brother had open heart surgery. I used the same as traindriver suggests.
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