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04-05-2021 #1
Alright, here we go.
I want to start off by thanking everyone. There is so much useful information on this forum, without which I wouldn't feel comfortable attempting such a complex and expensive project.
Goals:
This is a hobby machine, I do not intend to make money with it.
I really enjoy the process of learning, designing, building and improving a machine. For me, this process is half the fun of it.
I'll use the CNC as a tool to help with all sorts of DIY projects and hobbies.
Things like making electric guitars, small furniture, fancy signs, inlays, simrig components, backlit acrylic panels...
I will be working primarily in hardwood, plywood and hard plastics.
Occasionally, I'll want to do some light milling in aluminium. The aluminium plates needed for this projects are a good example (motor pockets, adapter plates etc).
My tools:
- Tablesaw with a decent crosscut sled and a blade for cutting aluminium
- Router table / handheld router
- Drill press
- Mpcnc
- Drill press
- I do not have access to anything capable of machining steel
Requirements:
- Minimum work area: 800x600x80
- Materials: hardwood, plywood, hard plastics, aluminium
Current design: (shows Nema34 motors and taper lock pulleys, other options listed below)
- Parts can be made using my limited toolset
- Work Area: 1000x800x120
- Footprint: 1300x1100x720 (fits neatly in the corner of my garage, and leaves just enough room for an enclosure)
- Main Frame extrusions:
- 3x 160x80S
- 2x 80x80S
- 3x 80x40S
- 20mm Aluminium Plates (Red)
- 15mm Aluminium Plates (Yellow)
- 10mm Aluminium Plates (Green)
More Pictures:
X Axis
Y Axis
Gantry
Not shown are cable management, endstops, timing belt covers, enclosure, table etc...
I want to get the design more or less locked in before I continue on that path.
Making the parts:
- I will order aluminium plates already milled flat (10mm, 15mm, 20 mm).
- Most plates have 90° and 45° corners. Those I can cut to size on my tablesaw.
- I'll use the mpcnc to mill the motor pockets and the holes needed to insert the FK/FF bearings.
- The mpcnc will also function as a "cnc centre punch" to mark all holes to be drilled on the press.
Spindle
- G-Penny 2.2kw water cooled + VFD
Linear Rails (from BST)
- 6x Hiwin HGR20
- 12x Hiwin HGH20CA
Ballscrews (from BST)
- X axis: 1 x SFU2010 (~1320mm)
- Y axis: 2 x SFU2010 (~1160mm)
- Z axis: 1 x SFU1605 (~400mm)
Estimated motor / mass:
- 1 Z motor: 12.38kg (27.3lbs)
- 1 X motor: 22.96kg (50.62lbs)
- 2 Y motors: 65.79kg (145.04lbs) + ~5 liters of sand/epoxy mix to fill the X axis 160x80S extrusion
Motors I'm currently considering:
- Lichuan
- Nema24 LC60H2102 4.5Nm
- Nema24 LC60H2127 5.5Nm
Buying them locally is even worse, 800€ for 4 motors + drivers
- Stepperonline
- Nema34 Stepperonline Nema34 ~4.5Nm
Drivers I'm currently considering:
- Lichuan LCDA86H
- Stepperonline CL86Y
- Stepperonline CLA86T
- HBS860H (these sketch me out because of how cheap they are...)
Belt drive:
- HTD 5m closed loop timing belt
- Motors will use standard BF keyway pulleys.
- Ballscrew pulley types I'm currently considering:
- Standard AF/BF pulleys with grub screws. (feels flimsy, might slip)
- Clamp type BF pulleys (could only find one seller, max 25 teeth with 15mm wide belt)
- Taper lock pulleys (heavy, min 32 teeth)
- DIY taper lock pulleys using ER collets.
Controller:
- AXBB-E running UCCNC
Power supply:
- 230VAC -> VFD
- 230VAC -> 60VAC -> stepper drivers
None of this is set in stone. I'm not in a hurry, and no parts will be ordered until I'm satisfied with the design.
This is how far I've gotten on my own. I'd really appreciate any critique / comments / suggestions / advice.
Thanks,
Jeff
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