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MeTarzan 18th March 2013 02:34 PM

Build Your Own CNC Machine
 
blackFoot 4x8 v4.1 CNC Machine

Anyone here ever assembled a kit from these guys? Is CNC'ing 4x8x1" MDF for around 5K realistic? Kit looks easy enough, but sounds too good to be true...

hotdrop 18th March 2013 03:27 PM

There should be plenty of kits in the 5K range but I think you will see a large variance in accuracy and material quality. I would look for a kit with higher quality linear railing and really understand how the unity braces on all axis. Remember this thing will want to shake violently if there is too much slop and for accuracy its important to understand how they reduce backlash. If you can get something used on Craigslist (ive seen occasional machines show up here in the seattle area) that might be a good way to go as you can see it in action.

jex2013 20th March 2013 06:40 AM

You need a new cnc machines? I would like to recommend Click-N-Carve 84030 CNC Carving Machine with 17.7-Inch Capacity. It's the most popular carving machine in the market nowadays. Check it out. :)

zoomer155 21st March 2013 01:53 AM

This is my 1st post. Anyway I worked for a Company called Esko Graphic's long time ago we sold and serviced Kongsberg X,Y cutting tables even an old unit from the mid 90's would be a better choice at $5k. Kongsberg did make a unit that had a router head was a bit $$ as all Kongsberg stuff is. I'm sure if you look around for a used unit one could be found. I'm thinking a an old flatbed unit called a " die saw"mite work would need a little mod. lot's of companies quit using them years ago if you could find one. good luck zoomer !

hitachi_nut 26th March 2013 05:00 AM

A lot of these hobby-grade CNC machines have mediocre electronics inside (underrated parts, poor component choices, value engineered all over and the list goes on). The packaging can be very fancy to mask all these deficiency.

In general they don't last and the subsystems (stepper drives, control, etc.) they use go obsolete pretty quick unlike stuff made by Fanuc, Okuma, Yasnac, Mitsubishi, etc. Some use obscure sources where documentation (for future repair) and 3rd party support are non-existent and your only option is to fork yet another $1k+ or so from the machine integrator.

Maybe it's better to just make friends with your next door machine shop with a case of beer :)

MeTarzan 26th March 2013 11:27 AM

Ug yes well I have already lowered my aspirations and am considering 2'x4'. I don't intend to etch PCB's or machine metal (but you know how that goes...), just to cut MDF, but still need precision. There are some completely assembles units that seem attractive and there are some good deals on that auction site. I am learning more and more about CNC with every day of research. The more informed I become, the harder it becomes to decide. I do have a nice 2'x8' sturdy base I need to go pick up soon.

hotdrop 26th March 2013 06:54 PM

Hitachi, if only it was that easy to make friends with a machine shop operator. Everyone wants cold hard cash these days (at least in the us).

Jaimo 14th April 2013 01:33 AM

Check out the CNC Zone forum you will get good advice there. A diy gantry rack and pinion system will cost you less than a kit or, you can spend the same money on a diy system and get better performance / accuracy / repeatability. You will need access to a machine shop though.

Check out this site as well...Building the KRMx01 CNC

tubelab.com 14th April 2013 03:12 AM

Quote:

Is CNC'ing 4x8x1" MDF for around 5K realistic?
Those plans use a rather small stepper motor and a 3 amp controller. That will be rather slow on a machine that large.

I have been collecting parts to build a DIY CNC machine. I am in no hurry since I have no place to put one right now, but retirement is 1 to 3 years away, and my retirement man cave is a 24 X 36 modular home seperated from the main house. Power tools, and loud things can be operated without hearing "turn that thing down." I want capability to cut guitar bodies as a basic minimum. There are DIY CNC machines from crude to $$$ on Youtube.

Keep in mind that you will need some sort of CAD package that can turn your ideas into "G" code that Mach 3 or even a PIC based system can eat.


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