make a cnc hot wire foam cutter from parts availab

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Make a CNC Hot Wire Foam Cutter from parts available at your local hardwarestoreby tbarnea on July 12, 2008

Table of Contents

intro: Make a CNC Hot Wire Foam Cutter from parts available at your local hardware store ......................................................

step 1: Over View ............................................................................................................

step 2: The Y axis - Vertical axis (step #1) ..........................................................................................

step 3: The Y axis - Vertical axis (step #2) ..........................................................................................

step 4: The X axis - Horizontal Axis (step #1) ........................................................................................



step 7: The Lead Screw (step#1) .................................................................................................

step 8: The Lead Screw (step#2) .................................................................................................

step 9: ACME Screw (step #3) ...................................................................................................

step 10: ACME Screw (step #4) ..................................................................................................

step 11: The Software .........................................................................................................

step 12: The Electronics ........................................................................................................

step 13: The Stepper Motors ....................................................................................................

step 14: Finalizing the machine (step #1) ...........................................................................................

step 15: Finalizing the machine (step #2) ...........................................................................................

step 16: Videos .............................................................................................................. 1

Video .................................................................................................................... 1

Video .................................................................................................................... 1

Video .................................................................................................................... 1

Video .................................................................................................................... 1

Video .................................................................................................................... 1

step 17: Whats next ? ......................................................................................................... 1

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Comments ................................................................................................................... 1
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intro: Make a CNC Hot Wire Foam Cutter from parts available at your local hardware storeMake a CNC Hot Wire Foam Cutter from parts available at your local hardware store like HomeDepot . This machine can be used to cut wings for RC planes, surfboacrown molding, packaging foam and lots more

The original design was built in order to cut RC wings (even tapered wings - where one side is different then the other side)

Polystyrene (EPS and XPS) will cut using a hot wire - other foams - like polyurethane should only be cut with a blade or saw.

When cutting, be careful !!! - wire will get hot, and some people may be allergic to the EPS fumes - always work in a well ventilated area.

step 1:Over ViewMost parts can be found in your local hardware store, like Home Depot..The first prototype was made out of wood, but didn't look "professional" enough, so I decided to go with a more robust design made of steel.

The design can be modified to almost any size. Keep in mind that for longer travel you will need a longer lead screw.The problem with a long lead screw is that because it its own mass, it will "wobble" in higher speeds.One way to overcome this problem is to move to a larger diameter lead screw.Another way is to move to a chain or belt driven design. Belt driven machines are usually 8' and longer but require the use of micro-stepping. An example of a machinlarger then 8 foot would be a surfboard foam cutter.Some surfboards are up to 12 feet in length, the only way to cut these boards would be a belt driven or chain driven mechanism

I will try to cover this topic in the future with a sample machine and pictures...

We started out building a machine to cut wing cores, but soon after we discovered a huge interest in the machine for other industries - like moldings, architectures,surfboards, Logos, props, packaging Willow Sills, Casings, Wainscoat , Fascia, Crown, Parapets, Wallcaps, Pediments, Quatrefoils, Columns

www.8linx.com



step 2:The Y axis - Vertical axis (step #1)If you are building the CNC foam cutter for RC wings, then you wouldprobably need 10" max travel on the Y towers.

If building a hot wire CNC foam cutter for props, crowns, moldingsYou would probably want to go with a 4' x 4' (X x Y)EPS Foam billets are usually 3' x 4' x 8' or 4' x 4' x 8'

XPS foam comes in sheets of about 4' x 8' x (1" or 2" or 3" thick)

If building a CNC foam cutter to cut Polyurethane foam - FORGET ITPolyurethane foam should not be cut with hot wire, but a blade or a sawThere are CNC foam cutters for Polyurethane that work similar to a band sawBut use a abrasive wire instead of a saw - click here for more information

In this section we will build the two Y posts or towers (Y axis).The posts can be found at the fence section at Home DepotYou can replace these posts by any other post as long as youare able to keep them from vibrating during the cut.Any vibration of the posts will result in vibrations on the wireresulting in "waves" or not smooth cut of the foam.

The following can be found in the drawer section, you will need two 16" drawer slidesThe Home Depot Catalog number for 24" slides made by Liberty 7-81266-18070-4

www.8linx.com

step 3:The Y axis - Vertical axis (step #2)The above picture is of the 2"x4FT Post with foot - that's the Home Depot nameCat num: 204-008 Home Depot num: 6-39426-48607-7

measure 6" from the base, and screw in (or use a rivet gun) the slide to the post

Make two of these units - one for the left side of the machine and one for the right side of the machine.

www.8linx.com



step 4:The X axis - Horizontal Axis (step #1)This U shaped part (the X axis carriage) will hold the Y axis stud.Here is the Home Depot Catalog number for the part below:"Half Base" made by Company named SimpsonCatalog number : C751-973Home Depot num: 044315-10350these parts were punched and then bent, when we decided to make our own parts we hadthem laser cut and bent - then powder coated

www.8linx.com

step 5:The X axis - Horizontal Axis (step #2)Drill the 3 holes on the slides (24" slides), and mount the U shaped carriage onto the two slides using rivets or screws.You will need two of these units, one for the right side of the machine and one for the left side of the machine.

www.8linx.com



step 6:The X axis - Horizontal Axis (step #3)At this point we have an Y axis carriage which is mounted on the X axis carriage.We used large 5/8" screws to hold the post in place on top of the U shaped X carriage.

Now make the 2nd one - again you wi ll have a total of two units.

www.8linx.com

step 7:The Lead Screw (step#1)Using parts from Home Depot, I could only find threaded rods, I later foundonline, stainless steel threaded rods.For this section, I used a lathe and a set of tap and die.There may be ways around, but I chose to go the safe route.We later had ACME nuts made just for us - if you are interested in purchasingACME nuts Please visit our online store at http://www.8linx.com/cnc/online_store.htmThere are a few differences between threaded rods and ACMEs. Usually ACMEhave a lower inch per turn.

A later design, we used ACME screws that can be found on ENCO - search www.use-enco.com for ACME threaded - here is the exact linkThreaded rods

www.8linx.com
http://www.use-enco.com/CGI/INPDFF?PMPAGE=735&PMITEM=319-7392http://www.8linx.com/cnc/online_store.htm



step 8:The Lead Screw (step#2)If you use a 1/2-10 ACME screw and ACME Nut that means that the ACME screwwill turn 10 times and during this time it will advance 1 inch. If you use 3/4-6 ACMErods and ACME nut - this means the ACME screwwill turn 6 times and during this time it will advance 1 inch.When calculating the steps-per inch on a machine you need to know the ACMEvalue and the stepper motor steps.For example: using 1/2-10 ACME with a stepper motor driver at 1/2 step - tocalculate the steps per inch follow these steps 10 turns per inch times 200(which is the usually stepper motor steps per turn) times 2 (this is the half stepof the stepper motor driver) the total comes to 4000. This means that theresolution of your machine will be 4000 steps per inch

If you decided to go with the ENCO threaded rods, you can buy from them the ACME nut as well. Here is the link ACME Nutswww.8linx.com

step 9:ACME Screw (step #3)A simple way to connect between the motor shaft and the threaded rod, is a plastic tube.A better way is to make this "Coupler" out of rubber - this will help in case the motor shaft and the threaded rod are not aligned.We later moved to ACME screws that can be found on www.use-enco.com. These ACME screws come is 3' and 6' lengths. Since their diameter is 1/2" and the motorshaft is 1/4" you will have to machine these ACME rods to 1/4" diameter. Use your lathe of stop by at a machine shop and they can do it for you.

www.8linx.com
http://www.use-enco.com/CGI/INPDFF?PMPAGE=735&PMITEM=319-7392



step 10:ACME Screw (step #4)Now, make another one just like it, but mirrored.The last picture on this page shows that the two "T" brackets are facing each other,This is where the hot wire will connect. For those who wish to mass produce wings,simply add one or even two more "T" brackets and you can cut 3 cores at a time.

www.8linx.com

step 11:The SoftwareThere are a few software out there that will run the machine - some need special hardware - we spent months testing and evaluating many of these software andhardware.

1. FoamWorks software will work with the electronics in the package below - has CADcapabilities as well2. GMFC - needs a timer module - without the timer the package below will not work3. Mach3 is a generic CNC router software will work with the package below, but you need tobe able to generate 4 axis g code.4. KCAM - same as above - generic CNC router software - will do nice PCB boards as well5. DeskCNC - is an additional hardware board that connects to the PC via the serial port andits output is the electronicspackage below, not very easy to put together but doable.

Online storeAll of the software above other then DeskCNC require you to have a printer port on the PC

If you are going to cut wings or simple shapes we would recommend the use of FoamworksIf you want to cut complicated shapes and multiple shapes we would recommend DeskCNC or Mach3. We currently use AutoCAD to draw the shapes, then convert thinto G code using DeskCNC, and the last step is to run the machine using Mach3.

Here are some tutorials for all 3 software packages - we have spent many hours creating them, and they are free of charge to use or distribute !!

www.8linx.com

step 12:The ElectronicsThe electronics is the only part that is "kinda" hard to find.You can search ebay and look for "4 axis stepper motor driver".Then you will have to find 4 stepper that will match the drivers - pay attention to the type of driver you are getting. Some will work with Biploar motors and some will wowith Unipolar motors.The last step is to find a power supply. The power supply should be around 24V 5A, but its best to get all of the electronics from one source.If you can't find anything on ebay try this

The Electronic box works together with the software you choose.Make sure that the electronics you select can be programmed to accept pulse and direction for each of the 4 axis.Mach3, KCAM and Foamworks will all work fineMach3 will only drive the electronics. Foamworks will also generate a file called "DAT" file, and with this file it will also control the electronics.

Sounds complicated, but take a look at all these web sites and after a while things will start making sense.Mach3 - www.artofcnc.ca
http://www.8linx.com/cnc/electronics.htmhttp://foamlinx.com/FAQ.htmlhttp://8linx.com/online_store.htm



Foamworks - www.foamwork.net

step 13:The Stepper MotorsBipolar motorsThere are only two coils, and current must be sent through a coil f irst in one direction and then in the other direction; thus the name bipolar.Bipolar motors need more than 4 t ransistors to operate them, but they are also more powerful than a unipolar motor of the same weight.To be able to send current in both directions, engineers can use an H-bridge to control each coil or a step motor driver chip.

Unipolar motorsIn a unipolar stepper motor, there are four separate electromagnets. To turn the motor, first coil "1" is given current, then it's turnedoff and coil 2 is given current, then coil 3, then 4, and then 1 again in a repeating pattern. Current is only sent through the coils inone direction; thus the name unipolar.A unipolar stepper motor will have 5 or 6 wires coming out of it. Four of those wires are each connected to one end of one coil.The extra wire (or 2) is called "common." To operate the motor, the "common" wire(s) is(are) connected to the supply voltage,and the other four wires are connected to ground through transistors, so the transistors control whether current flows or not.A microcontroller or stepper motor controller is used to activate the transistors in the right order. This ease of operation makesunipolar motors popular with hobbyists; they are probably the cheapest way to get precise angular movements.

(For the experimenter, one way to distinguish common wire from a coil-end wire is by measuring the resistance.Resistance between common wire and coil-end wire is always half of what it is between coil-end and coil-end wires.

This is due to the fact that there is actually twice the length of coil between the ends and only half from center (common wire) to the end.)

www.8linx.com



step 14:Finalizing the machine (step #1)Clamp down both axis, one shown in the picture on the 1st slide.I use strong spring to keep the cutting wire tight. The spring also keeps the wire tight when cutting a tapered wing.You can get the spring in your local Home Depot. On some designs I have seen people using a bow instead of the spring design. I got better results with the spring, bfeel free to experiment

Here is a setup which I also use on my foam cutting bow. The router speed control can handle up to 15A And the power supply can supply up to 3.5A which is more thenough current for a 30" wire. (about 1.5A) The low voltage power supply is used to isolate the main voltage (110V) from the cutting wire.

Another way to go would be to use an isolation variac - here is a good choice for onehttp://www.action-electronics.com/variac.htmmake sure to get the isolation version !!!

www.8linx.com

step 15:Finalizing the machine (step #2)The router speed control can be purchased at www.harborfreight.com for about $20The router speed controller connects to the mains voltage and its output goes to a t ransformer (should be isolated)These transformers can be found in surplus stores like www.allelectronics.com

Another way to go is to use an insolated variac - this is better since it provides isolation from the main power.You can find this variac at http://www.action-electronics.com/variac.htmAlmost all variacs are NOT isolated, and by being not isolated, the user may get "zapped" if not careful. Use caution when powering the hot wire, try to stay at low volt(below 50V), in some cased you may need to go beyond 50V - in case you have a long wire. make sure never to touch the wire or the springs.

A hot wire CNC foam cutters as its name - cuts the foam by melting it before having contact with the foam EPS foam - expanded polystyrene at 1LB density can be cuspeeds from 10 to 20 inch per min XPS foam - XPS foam has an innate combination of properties that make it one of the most efficient insulating materials available. Tclosed-cell structure, responsible for the foam??s excellent moisture resistance, also contributes to its high compressive strength and superior thermal performextruded polystyrene foams may need to cut at a slower speeds, from my experience, when cutting XPS foam, I use a thinner wire - about 0.4mm. XPS cut are generasmoother then EPS foams.Another kind of foam is EPP foam (the kind they make the Zagi wing flyer) - EPP (Expanded Polypropylene) EPP foam doesn't dent or break. It has a "spongy" qualityit, so on impact it compresses and pops back to shape

Hot wire:We started out using stainless steel wire as our hot wire, this will work well, but the wire will not last long and can break under to much tension. If cutting a 2LB foam folarge project, wire breaking during the cut can cause a lot of $$ At a later stage we moved to Nichrome wire. Nichrome wire will last longer and will not break even whered hot. Keep in mind that the wire will tend to stretch when heated, so a spring is needed to keep it from sagging

The software I use is foamworks (www.foamwork.net)This software is the most popular foam cutting controller software, and also not to expensive (about $50) It will control up to 4 motors and let you cut tapered wings another shapes, take a close look at the site There is a lot of useful information there, and even a link where people

www.8linx.com
http://www.action-electronics.com/variac.htmhttp://www.action-electronics.com/variac.htm



step 16:VideosCutting multiple shapes out of one 4' x 4' x 8' block of EPS foam

Video

Video

Video
http://www.instructables.com/id/SV6JRF7FIKMXTUH/http://www.instructables.com/id/SV6JRF7FIKMXTUH/http://www.instructables.com/id/SV6JRF7FIKMXTUH/



Video

Video

www.8linx.com
http://www.instructables.com/id/SV6JRF7FIKMXTUH/http://www.instructables.com/id/SV6JRF7FIKMXTUH/



step 17:Whats next ?We plan on Building a CNC plasma cutter and explaining how to - step by step

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Comments

28 comments Add Comment

welgemoedr says: Mar 30, 2009. 7:15 AM REPi cant wait!

twrecks says: Mar 15, 2009. 9:29 PM REPI love this concept - and the price seems right. NEMA23 bi/uni/polar motors can be had for for $12.95 ea at www.mpja.com. Just the thing for cheap R/Cairplane fun. I plan to build the stepper control board myself. Also some folks on ebay are selling ACME rod machined down with delrin nuts for



sgt_rock says: Feb 5, 2009. 5:30 PM REPclearly i'm missing something. what cuts the foam?

twrecks says: Mar 16, 2009. 7:30 AM REPthe hot wire...

snowpenguin says: Mar 4, 2009. 5:38 PM REPThe hot wire cuts the foam...

scorcher says: Dec 25, 2008. 12:24 PM REPso its an electric etch-e-scech that cuts foam?

saltydog95 says: Aug 7, 2008. 4:27 AM REPHey, how does the hardware/ software of this thing work to make the tapered wings? Does it use each side independently to cut the different profiles on thright and left side at the same time?

trebuchet03 says: Jul 14, 2008. 7:45 PM REPIs there such a beast as a 3 axis hot wire CNC? Can I index the bed and spin 90 degrees?

For perspective... I want to make something akin to the photo below - well, a mold for it anyway... I would think, depending on design, I wouldn't be able tocut everything, but it would cut down on hand sanding time :) And I imagine I'd need a belt drive due to the long length...

Or maybe I need to make a hot stick CNC and remove material that way....

Llewner says: Jul 18, 2008. 6:02 AM REPYou need one of these:http://www.zcorp.com/Products/3D-Printers/ZPrinter-310-Plus/spage.aspx

trebuchet03 says: Jul 18, 2008. 9:31 PM REPI guess it's hard to see the scale from that picture - that thing is about 8+ feet long (that one is not the one I was involved in, but is a great example the compound curves involved) :p

I've used a zcorp machine for printing parts - but, here's an FDM I made a few months ago for this past year's project (second picture is of the modin a water tunnel). Oh, this is a fairing for a human powered vehicle ;)

The last picture shows the stacked cross section method...

Llewner says: Jul 21, 2008. 6:42 AM REPNifty! Actually, my comment was a bit of a joke. I used to build kayak's and know that foam stacking process all too well. ;) But just imagine ifthere WAS such a thing as a 12' zcorp! ;) Minimal sanding and insta-mold!
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Pkranger88 says: Jul 18, 2008. 10:46 AM REPI run the 3D Prototyping Lab at NIAR. We have a Z406 printer. I highly discourage this technology for anything that needs tolerances or is used for of function.

Llewner says: Jul 18, 2008. 12:07 PM REPI don't even see the Z406 on their site anymore. We have been working with Zcorp on a new product manufacturing application and have had nproblems with their newer machines. Perhaps your issue has been resolved in newer models.

Pkranger88 says: Jul 18, 2008. 12:53 PM REPRapid proto can be done any # of ways. ZCorp printers are great for color prints, desktop models, form concepts, surface verif ication (we've

done some models from video games, etc.ZCorp Printers are bad for Fit and Function prints due to their anisotropic scaling that results from the powder prints. From my industrycontacts, the newer machines have improved the "processing" of the parts, but the accuracy of the tolerances and the quality of finer detail still an issue.I print a lot of aerospace prototypes with very fine edges, etc.The 310 has a smaller print capacity than ours though it is more automated.If I had it my way, I would have both a ZCorp and a FDM or a SLA machine.

What organization do you work for?

Llewner says: Jul 21, 2008. 6:38 AM REPYeah, our tolerances aren't THAT tight. I work in the graphics / display / signage industry and we can generally fudge up to 1/64" on a loof stuff. Though I can say that the zcorp tolerances that we have observed are much t ighter than that. I can see how it might not work inaerospace and such, but it is generally fine on less rigorous applications. As for our application, I can't really talk about the specifics ofthat we are developing other than to say that it has to do with the forthcoming ADA (American's with Disabilities Act) guidelines.

omnibot says: Dec 25, 2008. 1:57 PM REPHow about a fab@home or a RepRap. They're based on making usable parts.

Ceriand says: Jul 17, 2008. 6:17 PM REPYou could probably make it work with this setup if you added a 3rd axis to rotate the block of foam. Of course, you could only reliably make convex oraxially-symmetric shapes.

Edgar says: Jul 17, 2008. 3:06 PM REPHow about the model boat makers techinque, draw a set of slices, sandwich them, then sandpaper them into a curve.

trebuchet03 says: Jul 17, 2008. 3:21 PM REP

Check this out

So that's the current method I'm using - but I'd like to save time and potentially some money by making it f rom a single block of foam - with a decendegree of accuracy :)

Edgar says: Jul 17, 2008. 3:12 PM REPWait, complex curves can be made, to a point...Just make the 2 points were the wire sticks from, move in angle to each other, i.e. one higher, one lower, then leveled, the to the other side.How?Hummm... Get some 3D wizz to do a program!

Edgar says: Jul 18, 2008. 1:03 AM REP...Or see this:Foam cutter

tbarnea says: Jul 15, 2008. 9:03 AM REPThis would look like a 3D CNC router job

nate71173 says: Jul 21, 2008. 2:25 AM REPhow much did this project cost? and how long did it take? can you strengthen the cut foam forms with an overlay of fiberglass? thankyou! looks really nice,and fun!
http://www.instructables.com/id/Make-a-CNC-Hot-Wire-Foam-Cutter-from-parts-availab/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/nate71173/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/nate71173/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/Make-a-CNC-Hot-Wire-Foam-Cutter-from-parts-availab/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/tbarnea/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/tbarnea/?utm_source=pdf&utm_campaign=commentshttp://www.foamcutter.pl/index.php?s=fcutt&gclid=CKmP4bj8yJQCFRDklAodRWaJkQhttp://www.instructables.com/id/Make-a-CNC-Hot-Wire-Foam-Cutter-from-parts-availab/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/Edgar/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Edgar/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/Make-a-CNC-Hot-Wire-Foam-Cutter-from-parts-availab/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/Edgar/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Edgar/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/%5BVideo%5D-Large-Scale-Mold-Making---Part-I/http://www.instructables.com/id/Make-a-CNC-Hot-Wire-Foam-Cutter-from-parts-availab/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/trebuchet03/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/trebuchet03/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/Make-a-CNC-Hot-Wire-Foam-Cutter-from-parts-availab/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/Edgar/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Edgar/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/Make-a-CNC-Hot-Wire-Foam-Cutter-from-parts-availab/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/Ceriand/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Ceriand/?utm_source=pdf&utm_campaign=commentshttp://reprap.org/bin/view/Main/WebHomehttp://fabathome.org/wiki/index.php?title=Main_Pagehttp://www.instructables.com/id/Make-a-CNC-Hot-Wire-Foam-Cutter-from-parts-availab/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/omnibot/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/omnibot/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/Make-a-CNC-Hot-Wire-Foam-Cutter-from-parts-availab/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/Llewner/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Llewner/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/Make-a-CNC-Hot-Wire-Foam-Cutter-from-parts-availab/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/Pkranger88/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Pkranger88/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/Make-a-CNC-Hot-Wire-Foam-Cutter-from-parts-availab/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/Llewner/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Llewner/?utm_source=pdf&utm_campaign=commentshttp://www.cadcamlab.org/http://www.instructables.com/id/Make-a-CNC-Hot-Wire-Foam-Cutter-from-parts-availab/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/Pkranger88/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Pkranger88/?utm_source=pdf&utm_campaign=comments


15/15

xtank5 says: Jul 12, 2008. 10:00 PM REPFunny thing is I saw this earlier today on another website when I Googled foam cutter. Ironic that I would later see this on Instructables.

xtank5 says: Jul 12, 2008. 10:01 PM REPAnd wouldn't it just be great if we could edit our posts?!

Mikey D says: Jul 15, 2008. 10:12 AM REPYes it would!

Yellow84 says: Jul 18, 2008. 7:52 AM REPthe link to the site is on every page...
http://www.instructables.com/id/Make-a-CNC-Hot-Wire-Foam-Cutter-from-parts-availab/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/Yellow84/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Yellow84/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/Make-a-CNC-Hot-Wire-Foam-Cutter-from-parts-availab/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/Mikey+D/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/Mikey+D/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/Make-a-CNC-Hot-Wire-Foam-Cutter-from-parts-availab/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/xtank5/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/xtank5/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/id/Make-a-CNC-Hot-Wire-Foam-Cutter-from-parts-availab/?utm_source=pdf&utm_campaign=comments#DISCUSShttp://www.instructables.com/member/xtank5/?utm_source=pdf&utm_campaign=commentshttp://www.instructables.com/member/xtank5/?utm_source=pdf&utm_campaign=comments

make a cnc hot wire foam cutter from parts availab

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