How to build a Custom CNC
 

Engadget has a really great 2+ part article on how to build a Home CNC. This is part one of ??? I will post the links to the later parts as they are posted...
If any team doesnt have to money for a 2 million dollar HAAS machine but still wants a small CNC for making parts check this out


(I realize not all HAAS CNC's are 2 million dollars but it sounds good for the purpose of a shock factor)

Re: How to build a Custom CNC
 

Our school uses an old Bridgeport Series I from the 1970's. This would be so cool to have...fun to play around with during my free time :). I am definitely thinking about doing this.

Re: How to build a Custom CNC
 

Sounds like a really fun pre-season project! I'll be looking into this.

Re: How to build a Custom CNC
 

Aww come on man you know those old Bridgeport's are fun! :) . Definitely a cool link I would really like to have one for myself actually. Kinda reminds me of the mask making machine in MI3 the movie. At any rate awesome stuff.

-Drew

Re: How to build a Custom CNC
 

Hey, they show you how to make a Lego USB flash drive!!! Awesomeness!!! :D :D :D
http://www.engadget.com/2006/05/26/t...o-flash-drive/http://

Re: How to build a Custom CNC
 

Oh don't get me wrong I love that machine :D

Re: How to build a Custom CNC
 

OK... if you want to try this - here is the ultimate resource:

CNC Zone

Lots of help for DIY CNC machines. Very VERY good resource.

Re: How to build a Custom CNC
 

As soon as I get the money I will be converting my Sieg X1 mill to CNC. :)

Re: How to build a Custom CNC
 

Maybe 10 years ago, Nuts & Volts had a mult-=part article on building a CNC 3-axis mill for about $400 (then). The XY table used 2 pairs of ball-bearing drawer slides (the good kind, with no play) and a dremel as the cutting tool, like this one.

Remember that a dremel is somewhat limited. Don't expect to cut aluminum with it, at least not quickly.

Regardless, definitely a project worth considering. The hardest part is the stepper driver, next is finding software for that old PC so the parallel port can be used to drive the motor driver. You can buy pretty good lead screws for not much more than the 1/4 inch all-thread the article suggests, and end up with 0.001 repeatability on 0.0005 accuracy.

If you attempt this, just think about what you're trying to accomplish, and don't cut corners where it matters. X, Y and Z must all be perpendicular to each other - perfectly. No play or wobble, in the lead screws (use plastic nuts, they last forever and have no backlash), or on any of the axes. Big is good, but too big is bad, becuase you get wobble. Why does that bridgeport weigh a ton?

Don

Re: How to build a Custom CNC
 

Agreed, we killed my Dremel this season cutting 1/4 aluminum plate. (And I mean killed, like doesn't work, period, I think I might try new brushes) Actually, I wanted to do something similar, I was going to try and make a laser cutter thingy, sorta like a waterjet/plasmacam. I was going to use potentiometers and heavily geared down globes so it would move slowly to increase accuracy. The cutter was going to be a CO2 laser, but I was unsure of how to "terminate" the laser beam after it cut through the metal. I might just build a CO2 laser for the fun of it, they're cool little things, a well made one has an invisible beam but generates a LOT of heat. Then I'd have to figure out shielding.... hmm.

Re: How to build a Custom CNC
 

So it doesn't flex and lose accuracy whilst making a heavy cut and stays perpendicular...this is why a small smithy lathe/mill/drill press are not that great since they have no structure to them and flex and lose accuracy

Re: How to build a Custom CNC
 

I have just the thing. TurboCNC. Free and fits on a DOS boot floppy and will run on anything higher than a 486. :)

Re: How to build a Custom CNC
 

I'm going to retrofit an old Emco F1 CNC mill this summer. The school was getting rid of it, so I thought I could repair it and get it working for simple stuff for the team. I mean - better than nothing, right?

http://static.flickr.com/58/16500066...73e819.jpg?v=0

Built a Custom CNC
 

This was what I ended up building, based on the Nuts & Volts articles: A custom 3-axis CNC controlled milling machine. I have it configured as a PC Board drilling machine, but I just need to change Dremel bit and the hold-downs on the table and it'll mill whatever. Slowly.

What the pictures don't show is that it's mounted on a cart, with an IBM PS2 PC (8086 processor, with 8087 math co-processor, 4.77 MHz, 640k RAM, bad HDD and 730 k 3.5" floppy drive).

The first photo shows the overall work area. Travel is X=9.75", Y=10.5", and Z=4". Speed is about 3" per second max, when drilling this is not bad, for milling it takes forever. Precision is 0.00025, accuracy is about 0.005 in 10", repeatability is +/- 0.002 inches. Note the Dremel mount for the Z axis. A Roto-zip could also be mounted there for milling, has a LOT more power than the Dremel.

Sure beats drilling by hand.

The second photo is a close-up of the Y axis. Note the end-position (home) switch, the red plastic no-backlash nut, precision lead screw (about $15 for a 3' piece), the rubber hose coupling the screw to the motor shaft, and most importantly the "drawer slides" used for the X and Y axis rails.

It has about 100 hours on it and still works great. Nothing has broken yet.

Don

Re: How to build a Custom CNC
 

^Very Nice

Re: How to build a Custom CNC
 

That looks very good!:) I came across this design a few weeks ago.

Re: How to build a Custom CNC
 

I wrote a cnc plotter program that took hpgl files and output steps out of the parallel port. I was building plotter / cnc machines at the time and there wasn't much code avilable.

A great resource is Luberth Dijkman in the netherlands. I think there is still a copy of my code there in the archives written in of all things..Pascal.

Here is a link to that page.

http://cstep.luberth.com/

A couple of other names are Ian Harries and Tomi Engdahl.

I think both were Brits. If you google either of those names and "tandon disk drive" you should get some intresting info on a "free" source for stepper controller boards and motors.

The old full height 5 1/4 disk drives for IBM were made by Tandon. Each has a TTL level control (you can control it with the parallel port of your computer) that Engdahl has mapped for you. The stepper motors are kind of weak but are great for building an experimental cnc / plotter / engraver.

A student of mine build one three or four years ago using tandon control boards, information from the above sites, and a bunch of MDF.

http://www.smallmetals.com/educoopwi...r.MikesPlotter

Building plotters and CNC machines was an educational experience, I would suggest starting with a NC etch-a-sketch run from the paralel port using tandon driver boards and tandon steppers. If you make it print out the first logo and bring it to a competition....

Good luck,

Re: How to build a Custom CNC
 

:ahh: :yikes: :D

HAAS machines are definitely not 2 million dollars..... but I use a Hurco VM-2 at work, its a much much better value than a Haas.

Tons more accurate too..... sub-tenth-thousandth chord tolerances and repeatable as all get out. Awesome user interface, very small footprint for the work cube size. Designed and serviced from Indianapolis. :o Sorry, I just really really like the machine.


Link to their website

Link to the VM home page

You can see their display at IMTS (Link)

Or at the free Brickyard 400 Open House (Link)

I can answer any ?'s you like. We have 2 homebuilt CNC machines as well (6'x12' and a 3'x2').

-Q

Re: How to build a Custom CNC
 

Personally i prefer Toshiba Machines and Mori Seiki...both very high quality...Toshiba machines are a pretty good budget and Mori Seiki are like the Rolls Royce of CNC's they are made to run full speed for weeks on end and have very high tolerances that are compensated for in heat changes and other small factors

Re: How to build a Custom CNC
 

How-To: Build your own CNC machine (Part 2)
Like i said here is part 2

Re: How to build a Custom CNC
 

I just retrofitted my knee mill Bridgeport copy and it is amazing what is out there these days to do this! Mine is based on the Logitrol 3 axis large servo system sold by "lowcostcncretrofits.com of Australia...great package and well worth the $2,500. (I got mine on an eBay auction for $2,000). I use Mach 3 from Artsoft to program and control it...another fantastic value at $159.00 Some pictures are below...


Dave Fahringer

Re: How to build a Custom CNC
 

Wow, I am SO jealous. That is just awesome. Now I REALLY want to convert my little benchtop machine.

Re: How to build a Custom CNC
 

I just purchased a 3-axis controller kit from www.hobbycnc.com - I'll have to let you all know how it turns out. This one goes into a retrofit Emco F1 CNC Mill. If everything works well, the second one I order will go into my own home-made CNC router.

Re: How to build a Custom CNC
 

look for one in our teams pit at the 2007 FLR ;)

Re: How to build a Custom CNC
 

And as i Promised Part 3 of i think 3 but im not really sure...feel free to correct me if i am in mistake but from the sound of it i think it is the end (yes i did make this like intentionally long

Re: How to build a Custom CNC
 

In case anyone was interested HobbyCNC has their 3 axis driver board kit and 200 oz-in dual shaft stepper combo on sale for $179. Seems like a great deal; I just bought one for my Sieg X1 micro mill. It should be noted that the driver board is in kit fashion and you must assemble (solder) it yourself. Also, you will need some additional components such as a transformer, bridge rectifier, fan, etc.

Re: How to build a Custom CNC
 

Yes, mori-seki makes very good stuff, and the price is higher but not bad, but... its nice to have the headquarters of the company in your town. That was one of the big draws we had to hurco.

-Q

Re: How to build a Custom CNC
 

A couple of interesting sites for those of you wanting relatively low-cost cnc with serious capabilities:

http://www.tormach.com/

http://www.industrialhobbies.com/

And for an inexpensive mill that can be retrofit:

http://www.lathemaster.com/HEAVYDUTY...E%207045FG.htm

Re: How to build a Custom CNC
 

WOO HOO! As of today, around 3:30 pm EST, the retrofit baby mill woke up, and moved. The way I wanted it too.

Just gotta get the spindle spinning and then we can make... uh... really really tiny things. 4" by 8" window to machine in. That's big enough to make gear box parts I figure.

Besides, even if we never use it, the team can learn what IS possible.