I am building a Mostly Printed CNC

[Sevin Straus]

I decided it was time to build a CNC for myself.

In doing my research, I found the MPCNC as it is known. If anyone has any experience with this, I would love to hear about it.

One nice thing about this is you can make it pretty much any size you want, and it will be like a Shapeoko in ability. It uses conduit or stainless 1" tubing, so you can run wild.

The website is: www.vicious1.com

I got their electronics bundle for 260ish(see the site for exact pricing), and the pre primary Ted parts for 160ish so I didn't have to print them myself.

The machine is some form of open source, so you can download the BoM and make your own. The 3d printed parts have downloadable files so you can print them yourself. There are a number of mods and upgrades in thingieverse. Iwas lazy.

I ambuilding the 1" (25.4mm) version and used the stainless tubing to make a usable work size of 2x3feet, and with the overhangs, it makes for a tables use of 3x4.

The table is a torsion box with 1/2 in. plywood top and bottom skins. The internal webbing will be spaced 9" apart and is 3/4 poplar, 3" wide. I will cut half laps for the lattice before I glue it together. 3'x4'x4"

Before adding in the top skin, I am going to add reinforced pockets in the corners so I can add legs when necessary, but generally I figure it will be on my table saw when in use.

Finally, I decided to not use the recommended router. While not a bad budget choice, is not how I wanted to go. In looking at the forums, I took heed of people's advice to not overload it with something too big, it is after all, a Shapeoko competitor not a shopbot competitor as far as the class of machine.

With have used the Shapeoko quite a bit, I went for the 500w spindle from Amazon.

[Tom M]

I've built a MPCNC with machine kit as a controller and workshop 88 (the makerspace I'm a member of) is putting one together as well.  Just curious what the weight of you router.

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[tom burtonwood]

Hi Sevin,

i am also building an MPCNC. i have all my parts printed, my tubes cut
to size and i am waiting for my schedule to clear (mid nov) to start the
build.

i have a Shapeoko 3 already built and milling away. happy to share my
experience with that too.

and i have a Shapeoko 2 that hardly gets used now. :(

T

http://tomburtonwood.com
http://twentysomethingsullivan.com
twitter @tburtonwood
insta @tomburtonwood

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[Sevin Straus]

It showed up at work today, so I will get my hands on it tomorrow and I will let you know.

[Tom M]

You might want to run a drill or reamer down the holes.  Also don't go nuts overtighten the bolts.    The x-y bearing blocks tend  to crack if  you rack the gantries.  Its very repairable  though with  a soldering  iron and pla filament.

[Tom M]

If anyone curious. Here a short sequence of autohoming and deracking.

https://youtu.be/FRT0teFvGy8

On Oct 10, 2017 11:43 PM, "Tom M" <sak...@gmail.com> wrote:

You might want to run a drill or reamer down the holes.  Also don't go nuts overtighten the bolts.    The x-y bearing blocks tend  to crack if  you rack the gantries.  Its very repairable  though with  a soldering  iron and pla filament.

On Oct 10, 2017 3:29 PM, "Sevin Straus" <se...@knowledgefusion.net> wrote:

It showed up at work today, so I will get my hands on it tomorrow and I will let you know.

On Tuesday, October 10, 2017 at 12:24:14 PM UTC-5, Tom M. wrote:

I've built a MPCNC with machine kit as a controller and workshop 88 (the makerspace I'm a member of) is putting one together as well.  Just curious what the weight of you router.

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[Sevin Straus]

Perfect timing, I am one belt sort of making it move.  I was not clever enough to order slightly more when I got the parts.

Building the torsion box was a lot more work that I had thought, getting it nice and flat was the hard part.

[Sevin Straus]

I have not seen the machinekit stuff before, but I had heard of it.

Makes me feel lazy just getting a bunch of stuff that should work together!

I like the limit/home switches you added, and I noticed that the printed parts that sit above the xy steppers is different from what I have.

Is this an "older" version, or have you added other upgrades beyond the switches?

I may also consider stealing your idea for the C channel that runs above the two steppers for cable management up to the spindle.

[Tom M]

What's that Johny Cash song about the Chevy..  the x-y blocks are original design.  We laser cut the motor mounts.  

I upgraded the carriage to the 525 and modded to take the thrust load off the motor.  I'm driving it about 200 percent what a stock MPCNC runs at.

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[Sevin Straus]

Having just got mine, I have the full 525 with the stainless 1" which is nice.

I did crack a few parts (thanks to the suggestion above, less than I would have otherwise!), but was able to glue them back together.  

I figure once I get it going, the next thing will be to add in the 3d printing stuff so I can make a few upgrades.

One thing I had thought of was an extra stiffening block that would go Outside the legs, where there is still a bit of tubing showing.  Something like a couple of triangles with cutouts for the printed parts that would lock onto the leg and the conduit.  Then a bridge for the 90degree gap between to of these fillets to add squaring strength.

Might be overkill, but rigidity is the bane of CNC folks!