Eric's Gear Eric's Gear


Max Speed: 1378 in/min (35,000 mm/min) (calculated)

Precision: 0.000882 in (0.0224 mm) (calculated)

Repeatability: TBD

Outside Dimensions: 68" deep x 128" wide x 11.5" tall

Effective inside dimensions: 49" wide x 97" long, no height restriction

1x Raspberry Pi 1b, with 16GB microSD card

1x Arduino Uno, with Grbl loaded

1x Arduino Mega, with custom sketch loaded

3x Nema23 stepper motors at 1.9 Nm (269 oz in), with brackets and belt pulleys

4x TB6600 motor controllers with 1, 2, 4, 8, 16, and 32 microstep options, max 4 amp, 20kHz

1x powered 7 port USB hub

Mostly aluminum extrusion construction

2x White LED strips, 12v (installed under gantry)

6x Optical and hard endstops

16mm linear rails and bearings

24v 20a switching power supply with power cord

ATX computer power supply, with adapter to power Arduinos, Raspberry Pi, and more

Wall plate with 1x HDMI port, 1x Ethernet port, and 4x USB ports

Surge protector

3M Rubber Timing Belt, 10mm Wide, 3mm Pitch

3x Idler pulleys

Keyed electrical shutoff

3x Emergency stops

22mm x 60mm drag chain (18mm x 50mm internal)

Lots of wiring and hardware for assembly

2x16 LCD screen

2x 120mm case fans

8x 4amp fuses and fuse bus

2x magnetic door sensors

Mount for keyboard, mouse, and monitor

Assembly instructions: printed (link) and video (link) - I'll post these when they are completed




Universal G-Code Sender

Arduino SDK



Some assembly required (gantry is assembled for build, then slightly disassembled to reduce shipping costs)

Keyboard, mouse, and monitor are not included, but required for use. The Raspberry Pi 1b requires an ethernet cable for networking. You will need a grease gun, with grease rated for low viscosity and high temp.

There is significant storage on the microSD card, but it is suggested you use DropBox, a USB thumb drive, powered external USB hard drive, networked storage, or other storage outside of the Raspberry Pi, in case of fire. Always backup your files to external storage to prevent loss in case of fire or SD card failure.

This CNC gantry is made upon order, rather than sitting in a warehouse waiting to be purchased, so it will take 2-3 months for delivery. New features and capabilities, and better components will be included, at no extra cost, as they become available.

Options included as they become implemented:

Genius 120-degree Ultra Wide Angle Full HD Conference Webcam (WideCam F100)

2x 8 way joystick

Temperature control for the fans

Vacuum hose attachment and shroud


This is a "bird's eye view", so you can get an idea of how large the machine is. I was standing on a table, with the camera above my head, so I'm guessing this was taking from around 8.5' to 9' in the air. I am not the only person working in this workshop, so I've edited this and the other pictures to remove visuals of projects not my own. Since there are lights under the gantry, I thought a "night shot" would be interesting.
In some of the other pictures, you can see a milling head mounted on the gantry. That is sold seperately, so here's a shot of the gantry without the milling head. Here's another view of the headless gantry. I want to make sure you know what you're getting, if you purchase this.
This is a view down the Y-axis rail on the left side of the machine. Here is a view down the right side Y-axis rail.
Since I showed you the Y-axis, here's the X-axis. If you hadn't already noticed, the banner at the top of this site also shows the X-axis, including the milling head. Milling head is sold seperately. I used optical limit switches for each end of each axis.
This is the current prototype of the controller box. This will be a metal case in any sold version. I believe a 4U server case will work, so that's what I'm going to use on my next build. I've labeled the major components, as well as made the components not included in this module greyed out. The layout will change once I get a metal case, but this shows you what all is there.
The monitor, keyboard, and mouse aren't included, but the stand is. This is the master/slave surge suppressor. This is wired so that turning on the monitor energizes the machine. You can also see 2 of the three emergency stop buttons, as well as the right side door sensor.
Since you don't want unauthorized people using the machine, I've put a key on the power for the control electronics. The monitor and the key have to both be on for this system to work. The monitor only engages the motors, while the key gives power to the Raspberry Pi, Arduinos, and sensors. Instead of guessing which limit switch or door sensor is tripped, I've added an LCD screen to tell you what's wrong.
Eric's Gear
Eric Ingamells
102 E Kimberly Rd Ste I, PMB 157
Davenport, IA 52806
CopyRight (C) Eric's Gear 2017