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How Large A Circle?

Joe Wood  Member


How large a diameter of a circle can a CNC cut with a 4' x 10' table? Is it limited to 4' or can you move it on the table after doing 1/2 of it? I'm hoping to have some 7' diameter circles cut.

I had these smaller circles cut but my CNC guy is out of town for another week so I can't ask him. The large moon gate entry I laminated.

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11/1/17       #2: How Large A Circle? ...
Jared Emery

Short answer: it depends. If you can cut your parts out as sections of arc and join afterward, you can make a circle with any diameter you want. See attached pic, with quarter circles joined with a puzzle joint. On the other hand, if you're trying to trim a part into a circle after it's been joined together, you'd normally be limited by the table width because oversized parts would collide with the gantry and ruin your day. However, I could imagine something could be worked up on an older cantilever-style router or machining center where your part would be supported off the table and indexed somehow, and the machining would be done on a section of arc at a time. Elaborate but possible.

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11/1/17       #3: How Large A Circle? ...
Leo G Member

Or you could do it with a router on a trammel.

11/1/17       #4: How Large A Circle? ...
Joe Wood  Member


Somethings to think about, thanks guys.

Yeah my CNC guy got back with me and said the largest he can do is 60". I'll think about the trammel or maybe laminate it up.

11/1/17       #5: How Large A Circle? ...
jerry Member

I had to cut a circle that were 12 foot radius and then when they told me that it was wrong They wanted it 12 foot diameter it had to be 6 inches wide. I could get 2 full circles out of 3 4x8 sheets of ply. I had to cut 51 sheets of ply for that job.

11/2/17       #6: How Large A Circle? ...
Paul Miller


I think I could do it. You just have to move the circle around, supporting the part that is hanging off the table. Cut maybe 20% of the circle and rotate it and cut again and again etc. It might be a challenge, but definitely can be done. I have an AXYZ with a 80" x 144" table. But, I do not know his machine. I only know my machine.

Nice work on your web site.

11/2/17       #7: How Large A Circle? ...
james e mcgrew Member


with a pure round and a table short width of 49 then the single machinable distance is 48" x 48 without any material beyond that, or you could do a 48 x 120 eliptical

11/2/17       #8: How Large A Circle? ...
Dropout Member

Depends on the CNC. I have a 5X10 with movable tables, so could do this.

An alternative is do it in 2 layers in halves. Rotate the top and bottom layer 90 degrees and away you go. Done this many times for 10 foot diameter circles.

11/2/17       #9: How Large A Circle? ...

u could also do like he said with the puzzle joints in cheap material & lay on your good material & use it as a template for hand router.

11/3/17       #11: How Large A Circle? ...
tom Member

It depends on the CNC our Beisse's could cut larger by spinning the material as they don't have the duel support gantry.

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