1. Can be a weekend project if you have everything in stock and put all your time to it Can last a year if you just work now and then on it. It took me about a week or so
2. Don't worry, there is enough informations here, you'll be able to build it without any problem
3. ???
4. Profit

 

I am looking for all of the OX plates in sketchup drawings. All I have seen online is the .dxf files and from a hobbyist stand point I cannot justify paying for the autocad just for these drawings. So if anyone has the files I would really appreciate a copy of them please.

 

Thank you very much, exactly what I was looking for.

 

Never heard of it before, Thanks for the info.

 

Hi guys,

Been in the workshop a bit the past few weeks cutting plates for our CNC router prototype! I had a bit of crappy start after swapping in a new 24v 18k RPM ourtrunner that just would not cut... Spent days changing EVERY setting I could think of.....

https://www.facebook.com/video.php?v=892462370853995

Only after remembering the CNC golden rules:
1) Coffee First
2) Zero is your friend
3) Have a second coffee just in case!
4) Thinking is now possible you may proceed

did it click that I had not checked my spindle rotation... sure nuff was running backward.... I was at this point quite impressed how much ali. I had managed to rub away up till this point.... also running very low on cutters.... Doh!

https://www.facebook.com/video.php?v=893778464055719

With that sorted and a few hours making the rest of the apartment bock hate me we have these fresh of the table with nothing more than a wipe of a rag to remove any cutting fluid. Very happy with the finish considering this was run on a double belted OX and home-brew outrunner spindle.

​

The job was run with a 1/4in single flute up spiral cutter at 900-1300mm/min and 13,000 rpm and 0.25mm step down. To get the best finish all parts were roughed leaving 0.15mm skin on the walls. I then vac ALL chips (that my dust hood missed ) off the table and any trapped in the bottom of the slots/holes before running a last finish pass. Because it steps in for the finish the cutters leading edge engages the cut with clearance on the offcut side of the tool, I find this method helps the finish but also stops any un-tethered off-cuts getting flicked around so much. I still have to chase out my very small holes as they look a little off round but really this is getting a little picky as overall the parts are more than accurate for the task at hand.

​

Next time I may stop being so lazy and whip out a 3-4 flute finish cutter to see if the results are worth the tool change. Any one else bother swapping to more flutes for finishing?

We often get asked if the OX can cut aluminum and while we would recommend a Cbeam style rig if it's going to be a common material for you, this proves to me with careful cutting strategies and a bit of extra work you can get very good results !

Now more importantly I want to finish by thanking you all for sharing the knowledge, skills, designs and thinking needed to help me achieve far better results than most would expect from such a "light" machine. A also massive thanks to Mark, Trish and the growing OpenBuilds team for helping give us the tools needed to grow our passions!

Don't forget, Coffee first.... ALWAYS!

 

Hi Keiran

I’ve been using a 1.5kw water cooled spindle on my 500x750 Ox and it’s been more than adequate but… for my latest project I think I’ll switch to a 4 bearing 2.2kw spindle not necessarily for the power, it’s runout I would like to improve. On a precision per dollar scale ER20 collets seem to be the best choice.

Since my shop almost never gets over 19C even in summer I’m pretty sure in my case water cooling is probably a waste but it looks cool, so I’ll probably stick with it.

Cheers

 

Should be ok, you’ll probably want to use dual opposing belts for one that size anyway to prevent stretching, you can save weight by using a lighter motor mount similar to the one in the open builds store (needs adapter to fit spindle) instead of the heavier solid spindle mounts, and you can always reinforce the gantry if needed without adding too much weight.

 

Sorry my bad, I think they have been calling them double belts or belt and pinion, by using double sided tape to adhere a bottom belt face up inside the V-slot the top belt then rides on it like a rack and pinion gear preventing belt stretch.

 

a few good vids by Martin Barfoed to help get your head around double belting an OX.

www.youtube.com/watch?v=qXjLuLqFb-U
www.youtube.com/watch?v=gwD7UYtYBdk

Personally I think this should be almost considered a standard thing to do on ANY size ox as it makes a huge difference and the hardest part is finding the right tape.

 

On my Large format OX, I have a 1.5kw water cooled spindle, and I feel that it is at the absolute weight limit for the Z axis. It requires power to be constantly on to the stepper or it just slides right down. Not sure if you will be able to handle the weight of the 2.2kw spindle, but as they say, nothing ventured, nothing gained. Good luck, and I am curious to how it works out for you, as I have toyed with the idea of a 2.2KW spindle myself.

 

Same on any router or even mills, easy fix is to use a 2 start lead screw.

 

Personally I think 700w spindles are the best weight to performance ratio but more importantly the forces your going to see from this size spindle (limited to a 7mm or smaller tool because of the ER11 collet size) are balanced well with the rigidity of the OX build. I never see the point of having huge amounts of head room in power if your machine can't hold stable when your using all of it. The extra weight that you can't use having to be accelerated and the Z drop are just not worth it IMHO. I could be wrong but are people even with the 1.5kw spindles feeling like they are running them above half power ever?

I use a 30:20 tooth pulley ratio on my Z and this alone with the OB 8mm pitch screw holds my Z stable even when de-powered and also helps give me a little more Z resolution too.

 

Help.....
why spoilboard surfacing like this

 

@Lstj Is your spindle perpendicular to your X axis?

 

yes, perpendicular
only the right and left flat

 

Is the v slot extrusion not available anymore?

 

you need to tram your spindle.

 

That's a great work! I would need an information about the screws of this machine. I ordered the screws in France (I'm french) except the M5 15mm screws cause I can't find it in that dimension and I was wondering if it was a problem if I use 14 or 16mm screws instead?
I would be really grateful if anyone could advise me on this^^

 

In the process of upgrading my 500x750 OX to a 1000 x 1000 I ran into a problem with the 20x60 linear rail. My original rail for the x-axis was just under 60mm while the new longer rail is just over 60mm. I have slacked off the eccentric screws to lowest point however it's tight which is causing the gantry to need a little force to move it and make the wheels have sticky points or bumps or whatever you get when you leave wheels along too long pressed hard against metal.

I don't know what the right solution here is. I am thinking g something has changed with Openbuild 20x60x1000 rails in the past year or the dimensional spec can have some variation. On either case I need to figure this out.

 

I'm sorry of this was covered before. I have the small OX with tiny g and I am on my second dremmel 4000. Mainly use it to engrave and cut wood. I want to upgrade and I already have the DeWalt router, but I think is too loud and annoying. I run it for hours at a time. I think I read on this post some time ago that the 300w quiet spindles are crap, so what are the options? 400w spindle? I have seen them come with mount, but does it fit the Ox rail? Thanks!

 

probably would be good with a 0.8kw spindle like FOUR BEARING 0.8KW WATER COOLED SPINDLE MOTOR ER11 AND INVERTER DRIVE VFD CNC | eBay

I have bought my 2.2kw from this seller altho i havent actualy used it yet to cut anything ,but i did a test run and its quiet as a mouse compared to dewalt router i have.

The spindle was delivered within 5 days of purchease.

 

Hi guys,

i'm having big problems with my ox - maybe someone can help.

I want to mill a fancover and there are 3 things to do: 1) cut slots 2) drill some holes 3) mill the profile. 1 and 2 are working fine but when milling the profile the cut is nowhere near the original line or it shifts after doing the first pass. I've attached a picture to show what i mean and also one with the simulated gcode. The simulated gcode looks fine, i've also tried different tools to generate the gcode (cambam and fusion 360) but it's still not working. I've also tried different feed rates and different tools for sending (grbl controller and universal gcode sender).

Maybe i'm missing something obvious?

Thanks and best regards,
Kai

 

can i use CNC TB6560 4 Axis Stepper Motor Driver Controller Board in ox cnc machine