CNC Milling Machine

 

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CNC Milling Machine

This is a CNC milling machine that I designed and built in 2017.  After looking at available designs on the net (OpenBuilds, ebay etc) I decided to design my own machine.  This will be a good test for a project that cover mechanics, electronics & software.  My goal is to keep everything simple (I have to be able to build it myself) and keep the costs down (but put money where it counts!).

I will add more details on this page as I progress, for now you can check my blog about the conception / build of the machine

Specifications :

Workarea : 1145mm x 730mm x 175mm

Overall size : 1550mm x 1085mm x 480mm

Weight : approx 400 lbs w/ aluminium bed (estimated)

Rails : 20mm linear rails for X/Y axis, 16mm round linear rail for Z axis

Screws : RM1605 screw + anti-backlash nuts on all axis

Motors : NEMA23 425oz/in

Resolution : 0.00012"/step (Micro-Stepping), 0.000984" / physical step

Repeatability : < 0.001"

Flex : 0.004" under heavy force - need to fix

Probing :

Probe 1 - XYZ touch sensor (mounted as a tool in the spindle)

Probe 2 - Tool touch pad - measure tool length and adjust Z to match previous tool

Probe 3 - Material Height Sensor - Used to find the material top using current spindle tool

Limit Switches / Home switches

Optical min / max travel and home on all axises

Costs so far... (CAD$ - approx 4250$ as of Feb 2018)

Rails   1015
Extrusion 500

4 x Nema23 425oz/in + Drives + Power supplies (36V)

http://www.ebay.ca/itm/US-DE-Ship-Wantai-4Axis-Nema23-WT57STH115-4204A-425oz-Single-Shaft-4-2A-Driver-/321361716384?hash=item4ad2a6a4a0
SmoothStepper ESS 288
Mach4 235
T-Nutz  100
Screws 150
2 Rolls of ABS for my 3D Printer - 60$
3 x 1000mm wire guides - 80$
Start / Stop / Emergency buttons - 15$
Air valves - 40$
Air Regulator - 25$
Air hoses - 20$
Hoses fittings - 40$
Spindle coolant (prestone) - 2 x 4L - 50$
Spindle cooland pump = 40$
ER20 collet set - 60$
Micrometer - 60$
Caliper - 30$

Tools : 200 (saw blade, bits, taps etc)

ER20 14 pcs imperial collet set 41.000

https://www.amazon.ca/gp/product/B01N32RTPJ

2.2Kw Water-cooled spindle + Variable Frequency Drive (220V) 462.00

https://www.amazon.ca/gp/product/B010FIQ80M

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