Added most screws and limit switches. I like the fact that the limit switches on the sides are under the frame and protected. I may eventually switch to optical barriers as I feel this would be more reliable / repeatable (at least for the home). I also confirmed that MACH3/4 support Axis+/- limit switches. I also started to think of a safe way to mount the electronics inside the frame. I'm planning to use either rubber mounted or spring suspension in order to keep vibrations away from the electronic. Also planning to put at least one fan to ensure proper airflow. I'm also looking at putting the VFD right up in the mast and water pump/tank(s) under the bed which would allow for a totally standalone machine (just need to feed power and air)
What a week... I started to place the order for the extrusions at OpenBuilds.com and found out the shipping cost to Canada would be 218$usd + customs. I then found a local supplier in Montreal and called for 3 days in order to get a quote. I finally gave up on this supplier and looked at imperial extrusions instead, which are way easier to find in north-america. I found a distribute for 8020 inc in Ontario and then decided to change the current design to use imperial extrusions. While modifying the original design, I also spent some time trying to identify possible ways to make the design / construction easier. I then decided to change the bottom frame of the machine for one that would be easier and cheaper to construct. Specifications : 7" Z clearance below the beam
Today, I 3d printed a bunch of parts that I will later machine out of aluminium. I also placed the order for t-nuts and will probably order the extrusions tonight or tomorrow. I'm having a bit of an issue with the rails supplier (china) due to holidays there. Worst case, I'll find another supplier! I set my 3D printer to the fastest print / lowest quality (0.35mm / layer, 120mm/s) as these parts will be discarded anyway. I also had a 'spaghetti' incident where one of the supporting rods for the head disconnected (magnetic) and the head simply sprouted plastic in the air.
Progress update Over the last few days, I added all missing screws, normalized screws lengths and started to build my orders for material. I'm going to start with the rails / extrusions in order to build the frame. Printing the plates using my 3D Printer I've finally decided to print all parts that can fit on my 3D printer. Pros: Faster than manually cutting / drilling the parts Allows for inexpensive test-fit / changes Allows to use the machine itself to machine the parts using aluminium Cons: Not sure about the rigidity of the printed parts : will the machine be stiff enough to machine its own aluminum parts ? Will require complete disassembly / reassembly to replace the parts Here's a teaser of some motor mounts, limit switch holde
Added Sub-frame angle connectors, modified design of connection plates and added X axis Screw Nut to Z carrier plate. I'm planning to start cable chains this week along with preliminary bom / pricing
Spent the evening adding limit switches / home switch on all axis. I'm not sure yet if the controller will support a home switch but I would rather have hard limit switch with a separate home switch : I want to eleminate any chances of the motors pushing against the frame on a axis stuck at the end of its course. Switches holders and limit switch bumper are all going to be 3D printed with ABS Cya
This is really starting to take shape. Added the motor mounts (3D Printed ABS), Z axis motor / plate. Fixed various issue with the project structure in Inventor (adaptive parts, constraints etc). Order for rails and extrusions will be placed this week. Next steps are the connection between screw leads and carriages for X / Z axis. I also need to figure out limit switches / wiring.
I've been working on the cnc milling design all weekend and tonight, here's where I'm at. I also spent some time learning about iLogic / iPart in Inventor. Design size is based around 1500mm Y rails, 1000mm X rail and 350mm Z rails. Early estimated working size is 800mm x 1300mm x 6.5" high
I'm in the process of designing a new CNC milling machine (gantry-style) After searching the internet for open-source designs, I couldn't find a design that meet my requirements Below 3000$ cdn At least 36" x 24" work area Extremely rigid frame Must be able to work with wood, plastic, aluminium and steel > 6" clearance on the Z axis Long lasting mechanic (no plastic wheels to wear down) Open source so I can tweak and upgrade Readily available hardware I've found many designs on http://www.openbuilds.com/?category=cnc-router-builds&id=286 and https://id2cnc.com/ but nothing that meet all my requirements. I decided that the risk of building a machine that wasn't strong enough and would need to be replaced in a year outweighted the complexity of a new