Sort of beginner question larger cnc cutter

[Latexgurl]

Hi

I am sort of a newbie but have built my first CNC foam cutter based on the plans by Danny L. Ray but with switching out the MDF with Extrusion so I am not a complete CNC DIY veeergin!!!! :-)

I Have made up many foamie RC's but now I want to try a different project.

I want to build a CNC Foam cutter that I can cut and shape Surfboard blanks so that I can glass them and finish them off my self. The Board blank would be less than 8' Ft long 96 Inches lets say 4 Ft deep. Accuracy 1/32 or as best as I can get for my money about $700. Dios Mios I hear you say!!!!!!!!

Well My questions are sort of numerous,

1. Can I use my gecko and other electronics 4 axis controller for doing this?

2. Can I use my Nema Motors or would I need something bigger?

3. What should I use to build this extra long frame system so it doesnt flex too much? Aluminum Extrusion, Kevlar, .... hmm titanium?

4. Ball screws that are accurate through thier length without breaking the bank too much?

5. Should I be looking at building a foam router system to carve the length of the surfboard?

6. Any plans like Mr. Ray's that I can follow or just extend the lengths?

The blanks would be out of our old friend EPS. I just dont want to burn out a motor doing such long cuts or blow the wire or the controller overheating yaday yada yada
I have seen a guy that has built a machine he uses to make plugs for Kayaks and my length would be shorter than something like that.

Thanks for your help in advance and happy independce day!

Remember out troops and veterans

Ashley
Latexgurl

[Mac T. Knife]

We just bought a foam cutter from Demand Foam products, and are waiting for them to show up and do the initial setup and show us the ropes on the machine. (a requirement for the 5 year warranty) The machine will do 8 ft cuts, and all they are using is extruded aluminum frames,,, Nema23 stepper motors, and a rack and pinion system, where the rack is some sort of plastic,, and the pinion is directly driven by the motors. We are only planning on cutting architectural shapes, so it isn't a 4 axis machine.The way they describe how foam cuts, I don't see where the expense of ball screws would be necessarry, since the wire never touches the foam,,,, you just need enough force to drive the cutting assembly, without having to worry about cutting forces. Here's a link to the machine we received. http://www.demandhotwire.com/c844_.html

[Latexgurl]

The the design seems pretty easy actually. They are just using extruded aluminum also.

Mac you hit upon my other interest is Architecture(Applying for Grad School as we type. Portfolio stuff). Would be interesting to set something up and try some architecture stuff also.

I like thier design because it eliminates the whole table thing to keep everything straight.

The only thing I might worry about is some movement of the large blank for the surfboard as the cut moves along but I was thinking of this more as a semi rough cut blank cutter and finish the smotthing and final finish before glassing by hand. Of course the closer i could get it to the glassing stage would be great.

Luckily my dad was a blacksmith so I have some "toys" to work with i.e. Mig welder and other things. Besides having him around to help build it.

I am sure he is disappointed in his girl!!! I have Four older brothers and I turned out to like and be interested in many things they are and he is!!!

Although my former boyfriends never seemed to mind I was girly enough for them, cept for me wanting to drive the cycle!!!

Anyway keep up the suggestions and happy 4th!!!

Dont forget the troops!

Much Luv Ashley

[ViperTX]

hmmmmm....CNC veergin......*chuckle*

Ashley, I don't see how you can accomplish what you want with a "straight wire" foam cutter....it seems like that would still involve alot of manual massaging to contour the blank. I'm thinking that if you added a 4th axis to slightly rotate the surfboard blank you could achieve something that requires a minimum amount of hand work.

Do these cutters use nichrome wire?

Troops are always in my prayers.

So, you must be from one of the costal areas.....hmmmmm.....Redondo beach?

[GeorgeRudd]

Originally Posted by Mac T. Knife We just bought a foam cutter from Demand Foam products, and are waiting for them to show up and do the initial setup and show us the ropes on the machine...

What do you think of your Demand Hotwire Cutter?

Where did you buy it?

We purchased one recently (their Twister model with turntable and lathe) and I have been pretty disappointed with it so far. Their software absolutely stinks. It looks like they spent about a week writing the code (while drinking excessively). I am half tempted to build one from scratch and compete with them. I am confident that I could do it in about two months and end up with a product that is about a 100 times better.

I am a Macintosh user so I was already pissed off about having to get a Windows PC just to run the stupid thing. It comes bundled with "Corel Draw" (another heaping pile of crap software). I have to save my Adobe Illustrator files in a format that is about 8 years old just to import them into Corel Draw... just so I can import it into their terrible controller software.

[Latexgurl]

Hi Yall

Viper using a 4th axis to rotate the board within the frame was something I am thinking about also then there probably wouldnt be the problem of slumping of the blank when you cut.

Is there a way to make a system where you switch out the Wire with a router and route it down to close to a final shape? or would be making something that does both would be too hard to get the alignment right?
How would you be able to set it up on the software? My 3d brain is a little slow hvent had my triple espresso yet!!!

As for using wire and buying wire for hotwire work as well as other fun things :-) Aircraft Spruce and Specialty is welll ...... for lack of a better more updated term .... da bomb!!! Prices can be high on some stuff but other stuff they have is really hard to find.

Viper as for the support thing well my family has had more than one member in every major conflict i.e. war since the revolutionary war. My dad was one of the last flying sargents P-47's my brother was a spook and My great Great great hmm Uncle Charlie was a Surviving member of Custers Seventh Calvary he lost an arm before the fateful battle and wasnt there. Saw his burial site in Arlington National Cemetary when I was a Brat!!!! Well still sort of a brat!!! My Grandma passed down his Calvary sword. Dont know how proud I should be of his participation in the 7th though.

I am a midwest girl went to UW Madison early and moved out west to take a job in the Investment Banking world. Hated it although the two things I loved the most were the Cheap Mangoes and Learning how to Surf. Now I am stuck in Wisconsin and I am jonesing bad to surf Lake Michigan but sold my board. To buy another and have it shipped is like $500 to $600 dollars and there are no gaurantees that it will get here in one piece. SO I wanted a CNC foam cutter to do RC Plane parts and plugs for Carbon Fiber parts and noticed that bringing the size up to cut blanks for surfboards was a possibility so.......

Love the coasts though but in Cali I am more of a San Diego girl than LA girl. Right now I am a "better get my protfolio done girl so I can get my masters in architecture girl". But a girl needs exercise and I look good in a wetsuit :-)

SO now that all of you are BOARD TO ALL HELLL AND I AM WAY OFF TOPIC AND EMBARRASED AS HELL. I should go run(or plod in my case) and do my situps. Much Luv ASH

[ViperTX]

Ashley,

I don't believe it's easy to modify a "hot wire cutter" to add something like a trim router to finish the contouring....it can be done but probably not very feasible. What I see as more feasible is modifying a gantry style router by adding a hot wire assembly. Basically you would center the gantry axis, remove the router and attach an aluminum beam (inverted u shape) with the hot wire strung between the the tips of the "u". Do you get the picture?

I've been to Madison....like that lake arrangement.

Ah "war stories"....let's see my dad was actually in the 7th....how did he state it....he mentioned the campaign ribbons on their battle flags and one was of Custer's Little Bighorn campaign.....I think the mentioned the 7th, the 3rd and 1st Cav Division....he was actually a WWII veteran did his time in the Pacific at Leyete....Bronze Star and such. Actually rode a horse and had a pack mule that carried his 30 cal H2O cooled weapon....When shipped to the PT the horses were retired and it was on it's way to becoming the 1st Cav-Armored.

SD is definitely nicer then LA....no doubt.

Wet suit...hmmmmm....must be a software product....*smile*

[Al_The_Man]

Originally Posted by Latexgurl Uncle Charlie was a Surviving member of Custers Seventh Calvary he lost an arm before the fateful battle and wasnt there. ..........

.......Actually I had an ancestor that died at the Little Big Horn....As it happens he wasn't on either side....... He was camping near by and went over to complain about the noise............
Al.

[Latexgurl]

CANT Stop laughing!!!!

Viper I think I get the idea for the U loop. I think I saw a commercial unit like this when looking around on the web.

I dont understand how you would keep it so you could get accurate work from it. hhmmmmmm.

Looks like build it all and work out the kinks when I get there!!!

Ashley

[Mac T. Knife]

The U wire idea,,,,, Kinda sorta how the Lathe feature works on their wire machines,,, However, the machine we bought,(and is not setup yet) doesn't come with the Lathe,,, just the turntable. When we start kicking with the foam (we are currently a Structural steel fab shops,,,,,and there are architects that will draw a square peg, want it installed in a round hole, construct it out of aluminum, and want it welded to a piece of steel..... I'm tired of structural steel.) Hmm, went long with that rant,,,, anyways, once the foam settles,, I have an idea for a lathe, that would actually be a 4 axis gantry router thingy that would use a U shaped wire instead of a router,,, which should eliminate sweeping up foam dust. The key is to have a tangental control of the wire, so that it always faces the way its cutting. I wanna be able to make totem poles with minimal labor!

[Mac T. Knife]

Originally Posted by GeorgeRudd What do you think of your Demand Hotwire Cutter? Where did you buy it? We purchased one recently (their Twister model with turntable and lathe) and I have been pretty disappointed with it so far. Their software absolutely stinks. It looks like they spent about a week writing the code (while drinking excessively). I am half tempted to build one from scratch and compete with them. I am confident that I could do it in about two months and end up with a product that is about a 100 times better. I am a Macintosh user so I was already pissed off about having to get a Windows PC just to run the stupid thing. It comes bundled with "Corel Draw" (another heaping pile of crap software). I have to save my Adobe Illustrator files in a format that is about 8 years old just to import them into Corel Draw... just so I can import it into their terrible controller software.

We bought it from Demand Foam products out of Georgia, after we visited their showroom, The computer equipment was shipped from them, and the machine was drop shipped from europe,,, the manufacture of the machine is Omegaplot I believe.

The mechanics look sound,, the gantries ride on steel ways, and roller bearings,,,, If the software truly sucks,,, then I'll deal with it until I install a seperate controller, and run it with Mach3, I did ask about using dxf files, and they did tell me that it would process them,,,, Time will tell. 22,000 for a machine is a bit much when when you can build it yourself for less, but going from steel to foam, I look at it as having an inside source of information that I wouldn't have if I built the machine myself.

As for having issues with windows versus mac,,,, I've always thought of macs as being great for pretty pictures and such, but I haven't run across any cnc applications for them. I'd be curious if therewere.

[Mac T. Knife]

Originally Posted by Latexgurl CANT Stop laughing!!!! Viper I think I get the idea for the U loop. I think I saw a commercial unit like this when looking around on the web. I dont understand how you would keep it so you could get accurate work from it. hhmmmmmm. Looks like build it all and work out the kinks when I get there!!! Ashley

You would need a rigid plade such as these http://www.demandproducts.com/hotknifehd_blades.html