Completed the frame. I think I will use nearly all 50 angle brackets I got.by RodF - CoreXY Machines
I am preparing an off cut of bench top for my flat surface to set up the XY axis. I'm going to pour about 4mm of epoxy resin into it. It will be about 600mm square so will have plenty of room for the XY frame.by RodF - CoreXY Machines
Progress. It seems to be nice and square so far. Dialed up one of the rails and had no problem getting it to .01mm. Getting all the T nuts needed in is the main problem. So far so good and I do have some nuts coming that will go into closed end slots. As I am building this I am thinking ACP\Signboard\Dibond with ali angle extrusion would be a good way to do it. The tape is to stop theby RodF - CoreXY Machines
Put together a side to see how accurate it was. Turned out great, the main issue will be inserting enough Tnuts before assembly so I don't have to take it apart too many times. Forgot to get 3mm Tnuts for the rails so it will be a bit of a wait for those. In the mean time I will fabricate some to hold them in position.by RodF - CoreXY Machines
Here is a 220v 200x300 heater for a good price you will just need a solid state relay to drive it. They do a 12v version too but only half the wattage. I have a 12v heater from them on my current machine and it takes ages to heat up to 100C. I also have to run a separate power supply and a relay as it draws over 20 amps! I'm about to replace it with a 220v version.by RodF - CoreXY Machines
After some consultation and second thoughts I used a drop saw with aluminium blade to cut the extrusions. Nice square clean cuts all the same lengths.by RodF - CoreXY Machines
Today I will cut the 2020. 14.6 meters so with wastage I will pretty much use all of the three 5.8meter lengths.by RodF - CoreXY Machines
QuotefilipeCampos Hi, For the Z using 2 motors can be a problem because of synchronizations problems between the two and it will not allow to move the bed manually without "breaking" the bed level. The best is to try to find a solution with only one motor. In your case main problem is to be sure the motor was enouthg power to move correctly the bed, on thing you can do is to go with z screws thaby RodF - CoreXY Machines
More parts arriving from around the world. Titan extruder and Volcano hotend with hardened 0.8mm nozzle (not shown) which will be set up for 1.75mm filament. Steppers from China, hopefully the 130gm pancake motor will have sufficient power. If I need it I got a more powerful option the longer (30mm) motor which weighs 193gm. If the pancake motor is OK the full extruder setup should weigh aroundby RodF - CoreXY Machines
Here is a single Nema 17 Z drive version.by RodF - CoreXY Machines
I'm doing the same thing right now, but with a single Nema 17 stepper. And a different belt path just so I can fit my power supply and mother board in there as well. Why would you need 2? Wouldn't one be sufficient and simpler? I am worried one wouldn't have enough power. I suppose that as long as it has enough power to drive it up to the Z stop it will be OK. In normal operation it will beby RodF - CoreXY Machines
Working on the Z axis today. My original plan was to drive it with a single Nema 23 at 3A with a 2M542 stepper driver. Step and direction was going to come from the Smoothie board I got. However I also like the option of the new Duet Wifi so that's on preorder. I'm going to use the Smoothie to upgrade my current printer. My plan now is to use 2 Nema 17's on Z. Because they are in the same bby RodF - CoreXY Machines
Still working away on the model. My plan is to build the XY stage as a separate module and get that trued up before inserting it into the main frame which will include the Z axis.by RodF - CoreXY Machines
Quotehobbymods You can get cast plate from Calm Aluminium in Oz, and they've got a waterjet cutting guy just up the road from them that they work with. Cheers thanks for that. I wish I had asked earlier as I have already ordered a couple of 12" squares of 1/4". We have a waterjet at work which I occasionally operate (as little as possible they are dead boring) . I have agonised over the buildby RodF - CoreXY Machines
Work in progress. I've managed to order some 1/4" cast aluminium plate from the US, but that will not arrive for a few weeks. Hopefully around the time of the Duet Wifi.by RodF - CoreXY Machines
Nice work fabricating the metal parts. Looks like it should be pretty flat and rigid.by RodF - CoreXY Machines
I have pretty much sorted out the basic configuration of the Core XY platform. Still some spacers to model and the belt tensioners on the extruder platform to design. I have ordered a Titan extruder from E3D (and a 1.75mm Volcano setup). I have 3 different size motors ordered for the Titan to see what the lightest setup can be. Also pre ordered a Duet WiFi.by RodF - CoreXY Machines
QuoteFA-MAS Take a look at this. When I was looking at datasheets for these rails. I believe the holes are spaced perfectly so you could extend the X Rails a bit and connect them to the blocks on the Y, using 2 screws. That would make it alot more rigid, and you wouldn't need to fabricate the "ears" on the green part. Great spotting. Thanks a lot. That's serendipity. I will rework the designby RodF - CoreXY Machines
Decided to simplify the X axis mounting system. This does move the belt axis away from the carriage axis but should be more rigid and quite a bit lighter. If the X axis needs stiffening it will be easy to screw a piece of aluminium angle to the underside of the X rails.by RodF - CoreXY Machines
I did a quick deflection test on the 9mm rail. It is 400mm long, I put a 347gm load on each axis. With the rail flat it deflected 0.2mm and with it upright it deflected 0.1mm. I'm pretty keen to keep the rails flat for simplicity. Not really sure how much the X carriage will weigh with the extruder, hot end, 2 or 3 fans and the mounting system along with some cable chain. Worst case might beby RodF - CoreXY Machines
9mm rails arrived. I will start cutting metal shortly.by RodF - CoreXY Machines
CarlTune. I just tested it on my Mendle 90 machine and one belt is 103.52 Hz and the other 67.87 Hz. Yes quite a big difference which you can hear. Actually unless you were tone deaf it would be pretty easy to do it just by ear.by RodF - CoreXY Machines
I have a music tuning app on my phone. Just ping the belt (like a guitar) and measure the frequency. Easy to get the 2 belts the same tension if the lengths are the same (they should be down the Y axis).by RodF - CoreXY Machines
Great to see some hardware. Moving mass low, stationary mass high. That will work. Naturally I am interested in the level of accuracy you can achieve on the XY plane.by RodF - CoreXY Machines
Quotethe_digital_dentist Be sure to put the belts into your model and check for clearances at both ends of the Y axis Thanks for the heads up Mark. I will do that, I need to go over the belt tutorial again. I have been researching surfacing plates to set up the XY axis accurately and have decided on a self leveling epoxy surface on a concrete pad. I do a lot of composite work and have the epby RodF - CoreXY Machines
Kind of getting there with the XY part of the design. Struggling a bit with parts built within the Solidworks assembly, but it is a good learning curve. Mostly I am an Autocad guy and should really be using Fusion 360. I am thinking this arrangement is a bit lacking in adjustment to get the 2 Y axis arms on the same plane. Should be rigid though.by RodF - CoreXY Machines
Quotethe_digital_dentist I have never used 20mm extrusion but may give it a try at some point. The 1 1/2" or 40 mm stuff I use is industrial surplus that I buy at scrap yards for $2/lb, but it isn't always available when I need it or in the quantities that I might need. Does using all those corner blocks and hardware plus 20 mm extrusion cost less than using 40 mm extrusion without all the extrby RodF - CoreXY Machines
Quotethe_digital_dentist It doesn't come with a motor. I've seen claims (not by E3D) that it reliably drives filament with just a 20 mm long pancake motor, but I have my doubts about it. I'm just using the old extruder's motor and it seems to work fine. I think it's a 35 mm motor. Hmm I am tempted to get a Titan as I want a volcano block and some hardened steel nozzles. I thought I might serioby RodF - CoreXY Machines
QuoteMikk36 Are those the 2020 or 2028 corner blocks? They are 28 mm. I wish I had got some 20mm as well.by RodF - CoreXY Machines