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About 12 years ago, after I finally got my first CNC running, I started designing a new one.
I had a couple main goals:
1) Dual spindles, with independent Z axis.
2) Very high performance. (fast and strong)
3) Constructed mostly from wood.
Over the years, I've made a lot of small parts (prototypes?), and the design has been constantly evolving. I've already thrown away two complete Z axis, and will son get rid of all the parts for the Y carriage that carried them, as I'm now on the 3rd version.
As of now, here's a list of most components.
X and Y axis linear rails, Hiwin 20mm. 3000mm X axis, 1700mm Y axis.
Z axis linear rails, 2 sets of Hiwin 15mm, I think 300mm long (They're in a box somewhere.)
The two Z axis will be using 570oz Nema 23 steppers, with Leadshine AM882 drives, and an Antek 60V toroidal power supply. These will drive 1/2-8 4 start acme leadscrews with custom anti backlash plastic nuts. In order to keep the two Z axis as compact as possible, there's no room for ballscrews.
X and Y axis will be DMM 400w AC servos, driving helical rack and pinions through 10:1 gearboxes. Dual drive X axis.
Eventually, there will be a rotary 4th axis (axis #6, actually) with another 400w servo, through a 21:1 zero backlash gearbox (I have two of these gearboxes).
Control will be UCCNC, with their UC300ETH controller, plugged into a UB1 breakout board with UD1 daughterboard.
For now, I have two air cooled 2.2Kw round spindles, and a Huanyang VFD. I'm using one VFD for both spindles, using relays and contactors to switch spindles. They may be upgraded to something larger in the future.
Here are a couple Fusion 360 renders to get started. Not that the Y carriage will be completely redesigned from what is shown.
I had a couple main goals:
1) Dual spindles, with independent Z axis.
2) Very high performance. (fast and strong)
3) Constructed mostly from wood.
Over the years, I've made a lot of small parts (prototypes?), and the design has been constantly evolving. I've already thrown away two complete Z axis, and will son get rid of all the parts for the Y carriage that carried them, as I'm now on the 3rd version.
As of now, here's a list of most components.
X and Y axis linear rails, Hiwin 20mm. 3000mm X axis, 1700mm Y axis.
Z axis linear rails, 2 sets of Hiwin 15mm, I think 300mm long (They're in a box somewhere.)
The two Z axis will be using 570oz Nema 23 steppers, with Leadshine AM882 drives, and an Antek 60V toroidal power supply. These will drive 1/2-8 4 start acme leadscrews with custom anti backlash plastic nuts. In order to keep the two Z axis as compact as possible, there's no room for ballscrews.
X and Y axis will be DMM 400w AC servos, driving helical rack and pinions through 10:1 gearboxes. Dual drive X axis.
Eventually, there will be a rotary 4th axis (axis #6, actually) with another 400w servo, through a 21:1 zero backlash gearbox (I have two of these gearboxes).
Control will be UCCNC, with their UC300ETH controller, plugged into a UB1 breakout board with UD1 daughterboard.
For now, I have two air cooled 2.2Kw round spindles, and a Huanyang VFD. I'm using one VFD for both spindles, using relays and contactors to switch spindles. They may be upgraded to something larger in the future.
Here are a couple Fusion 360 renders to get started. Not that the Y carriage will be completely redesigned from what is shown.
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