How to Build a USB Hot Wire CNC Foam Cutter - Part 2 Electronics - Updated

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#usbfoamcutter #grbl #free-software
This is an updated Part 2 of the 4 part series with an eBook, Plan, Parts and Cutting List.
Since the original Part 2, the firmware and software have been updated and this video covers that as well as some simpler ways to upload firmware and calibrate the CNC foam cutter.
It's a full step by step build series from start to cutting your first wing.
Please see the later videos in the series. This updated video uses the later firmware and controller software
Time Codes
00:00 Intro
02:40 Electronic Parts Required
18:44 Firmware and Software
27:41 RAMPS Board Install
30:04 MicroStepping
38:05 Driver Current VREF
44:15 Bench Test
48:10 Connecting, Axis Checks
51:28 Fan connection
01:04:53 Calibration
01:11:48 Homing and Limits
01:13:38 Common Questions
The eBook and plans can be found here. rckeith.co.uk/how-to-build-a-...
** Parts List **
rckeith.co.uk/usb-hot-wire-cn...
It uses inexpensive 3d printer electronics and parts easily found in your local DIY store.
I use it to make RC wings and fuselages but it can be used to make many other foam projects.
Part 1 is the introduction give a brief overview of this step by step series to build your own CNC foam cutter
Part 2 Updated (Oct 2020) is the electronics build and configuration, this video including calibration and end-stop
Part 3 is the mechanical build.
Part 4 is the video showing wiring, axis checks, calibration checks(use this video for calibration) and making our first test cut. The last section shows software you can use to generate G-code for your wing
The free eBook also includes detail on how to build the parallel port version, if you want to use Mach3 or Linux CNC

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5 авг 2024

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Комментарии : 71

@whs2220 3 года назад

Thanks Keith for sharing your knowledge and techniques on this very fun hobby!!

@rckeith 3 года назад

Glad it helps

@cncdavenz 2 месяца назад

Thanks Keith. Looks like i have another project to build 🙂

@fabianortiz1200 3 года назад

Pretty cool Keith, thanks for sharing your knowledge keep building amazing things

@rckeith 3 года назад

Your welcome

@Brattoncnc 2 года назад

I'm an avid modeler as well and have a CNC router, Laser, Vinyl Cutter and 3D printer. I am currently gathering parts to build a 4 axis hot wire cutter with the help of your knowledge and videos. THANK YOU for offering this knowledge and skill to us for free! This may seem quite trivial, but my mind was blown with the Windows+X shortcut to Device Manager! FINALLY an easy way to access it! I thought I was moderately computer literate, but this is a welcome tip to me. Keep up the good work. Your fellow hobbyist appreciate it!

@rckeith 2 года назад

Thanks Ryan. I only found that shortcut a while ago. Makes checking lot easier.😁

@rahulchowdariandra9926 2 года назад

Hi Keith thanks a lot for share the knowledge and it is very help full for me to build rc aeroplane wings. Thanks a lot

@rckeith 2 года назад

You're welcome glad it was useful.

@henkrook4980 3 года назад

very good tutorial videos have started building and with this help it is going great wr Henk

@rckeith 3 года назад

Glad that are helping

@HakanAras 3 года назад

You are a great man Thanks a lot for the tutorial video.

@rckeith 3 года назад

You're welcome, glad you enjoyed it

@markgreco1962 3 года назад

Nice work

@rckeith 3 года назад

Thanks Mark

@massimoborghini9724 3 года назад

Hi Mr Howlette, congratulations for your great Job and thanks for your courtesy in Share all those information. I would Ask you If you'r a pc engineering or similar?

@rckeith 3 года назад

I was a motor mechanic and then I worked in computers from about 1993 on many systems. I'm now retired from working which is great. I still enjoy getting systems to work and fly my RC models. But in the UK now we are in lockdown so I haven't flown anything for several months.

@massimoborghini9724 3 года назад

@@rckeithYesterday I found your videos on RU-vid ,then site links. Totally Bewitched . A nice mind.👍

@aeropeoplellc8160 3 года назад

@rcKeith Thank you for sharing your knowledge. Is it possible to have independent axis using this method ? to cut taperd wings with different root an tip airfoils ?

@rckeith 3 года назад

Yes thats how it works with 4 independent axis. Check some of my other videos and you will see me cut tapered wings.

@SunilSundar 11 месяцев назад

Thank you for these cool videos. Are you connecting the 24V supply to the ramps board directly? isn't that over the rated voltage?

@rckeith 11 месяцев назад

No, I have two power supplies a 24v and a 12v. The MKS board supports 24v. The power supply I use for the RAMPS board is the one in the background on the video which is 12 volts

@SunilSundar 11 месяцев назад

@@rckeith oh! Thanks

@cautivapublicidad 2 года назад

Hola buen video ..podrias compartir el progragra para el gcode de hilo caliente

@rckeith 2 года назад

Check my website at rckeith.co.uk in the download section.

@tvideo1189 3 года назад

People, Keith's machine works. Even a troglodyte like me muddled through.

@rckeith 3 года назад

Thanks 😊

@now_watch_this 3 года назад

@@rckeith mr keith, how will wiring goes is i just want a 2 axis hotwire cnc? i have an arduino uno with shield and drv8825, x axis and y axis would be the ones working, correct me and help me if im wrong please

@rckeith 3 года назад

The firmware only supports the Mega 2560. So it won't work on the Uno.

@now_watch_this 3 года назад

@@rckeith thank you for your fast response mr keith, just one more thing, in the ardiuno mega that you use along with jumpers, which axis remain free and which ones keep slaved? x y z a, i know i can slave any axiz with a axis, thank you again for all your videos?

@rckeith 3 года назад

@@now_watch_this E1 is free axis. The firmware on my website use XZYU for axis names but the axis isn't slaved to any other. Each axis moves independently. When you slave an axis you send the same g-code to it as the master axis. If you want to use the Uno DevCNC Foam firmware will work but it's not free www.devcad.com/eng/devcncfoam.asp. You are much better off using the Arduino Mega or an MKS Gen L V1.0 board.

@Brattoncnc 2 года назад

Got my limit as witches figured out tonight. Just a guick note from a mistake I made. The ground terminal on the U limit is not adjacent to the input pin. Your photo on your website points this out, but the ebook does not. Happened upon the photo while searching a way to contact you. All good now.

@rckeith 2 года назад

Thanks, Ryan. Sorry about that I'll update the e-book. Glad you have it working.

@danielsteger5467 3 года назад

Does it also support max end stops I couldn't find it on the e book There is just written how to use the min end stops Great work I love your work 👍

@rckeith 3 года назад

It does its called Hard Limits but I don't recommend using it. Just use the min end-stops and set the max travel called soft limits. Page 52 in the latest ebook explains Hard and Soft Limits. Hard limits just add more wiring. On my old foam cutter with Mach3 and LinuxCNC I had end-stops at both ends and it just caused problems with chasing connection issues. There is quite a lot of travel on the foam cutter so wiring can be an issue. Keith

@danielsteger5467 3 года назад

@@rckeith thanks 👍😊

@befa3071 3 месяца назад

Hello and thank you very much for sharing. I'm just starting to test my cards. I have a zoom problem on the Grbl software, I cannot see all of the software despite having changed my display settings. My screen is 1366x768. Do you have a tip for this please ?

@rckeith 3 месяца назад

Try changing the resolution and make sure you are using the latest software. The software works best at 1920x1080

@befa3071 3 месяца назад

@@rckeith Thank you for the feedback

@thebikeracer 3 года назад

Keith, My motors spin/move faster when moving towards me and slower when moving away from me. Is that normal?

@rckeith 3 года назад

No that isn't. I would check you have set the vref correct on the drivers for the stepper motors. Also check the machine moves easily by hand. Disconnect the motors first otherwise you could damage the controller. Then turn the threaded rods or lead screws by hand and there should be no binding and the should move very easily.

@danielsteger5467 3 года назад

Nice work Can we also use a display?

@rckeith 3 года назад

Sorry no, it needs to be run from a Windows Computer.

@danielsteger5467 3 года назад

Thanks for the anwser I love your work 👍👍😁

@enessagir4305 3 года назад

Very nice! How can I generate g code for different shapes? ls there a program for that, that you can recommend me?

@rckeith 3 года назад

There are several depending on the shape you want to make. For general shapes there's DevFoam www.devcad.com/eng/devfoam2.asp for RC aircraft there is DevWing Foam and DevFus Foam.

@enessagir4305 3 года назад

@@rckeith Thank you sir ! I am an engineer student and i will design a 4 axis cnc foam cutter as yours, for my Bachelor Thesis. My professor asked to cut twisted wind turbine blades. We use Autodesk inventor to design 3D figures. What should I do for generate g-code with Autodesk inventors figures. Can you help me please.

@rckeith 3 года назад

@@enessagir4305 I don't use Autodesk Inventor but I do use Fusion 360. There is no option to generate 4 axis g-code for foam cutters in Fusion. I believe they use the same HSM engine to generate g-code but I could be wrong on that. So I don't think you will have much luck with Inventor. DevWing Foam may be OK for what you need because you can add a twist to the tip aerofoil. There is a demo version which allows you to do everything except saving the g-code. There is a simulator included so you could see it if works. I think DevCad have special licenses for students which will then allow the g-code to be saved. Hope that helps.

@enessagir4305 3 года назад

@@rckeith Thank you sir

@bigsubful 3 года назад

Hello, about stepper motors, is it better 1.8° or 0.9° ones?

@rckeith 3 года назад

1.8 are fine for the foam cutter. Foam cutting doesn't need high precision cutting.

@ChinaBox248 2 месяца назад

from the schematics i've seen for the RAMPS board it looks like you can only have up to 5A for the circuit that powers the stepper motors. Is there a way to increase this?

@rckeith 2 месяца назад

The stepper motors on the foam cutter use little current because they do not drive a cutting bit into the material. I use NEMA17 stepper motors rated for 0.9 amps and run them at 0-5 amps without any issues. So I wouldn't worry about it. Many guys have used the RAMPS board with great success with 1.5 amp rated steppers and have not had any problems.

@ChinaBox248 2 месяца назад

Thanks for your response! So if I had 6 motors that draw 1.3A (dual steppers on one of the axes), would that mean I need a power supply of 7.8A and not be able to use the RAMPS board?

@rckeith Месяц назад

I can't see how you would use dual steppers on a foam cutter. The motors will not be running at full current so I doubt it will be an issue. If you are worried about current draw then use an MKS Gen L board with external drivers.

@now_watch_this 3 года назад

i dont exactly understand what im supposed to download, is it everything that says download on your download page? my windows is 32 bit, so do i have to change to windows 64bit? do i have to download all 4 zip files and the others as well? i find easier to follow the first video than this second one updated, but the files have already been removed as they appeared in the first video, please guide me to this fist step.

@rckeith 3 года назад

Follow the instruction here to get the firmware uploaded. rckeith.co.uk/easy-way-to-upload-cnc-foam-cutter-firmware/ and then download rckeith.co.uk/download/grbl-hotwire-mega-5x-application-v-4-00/ The ebook has full step by step instruction so maybe download that as well rckeith.co.uk/downloads/ebook-foam-cutter/ Keith

@now_watch_this 3 года назад

@@rckeith i want to thank you mr keith for all youre doing in making this proyect and helping others archive it as well, i followed the instructions and now i think im close to finish the machine, but there is one thing that i think im having an issue with, all axis are responding just as you describe in the video, but in my case the x axis stepper motor runs slower than the 3 others, i checked the gbrl values and they do look ok and equal to all axis, i switched motors x and y and its the same result to the motor connected to x axis, then switch drivers positions a4988 and the issue continues so by those tests i rule out drivers or steppermotors issues do you have any suggestion on how to solve this?

@rckeith 3 года назад

@@now_watch_this Check the micro-stepping is set to 1/8 on each axis. The jumpers under the drivers are on the same pin. Have you checked the Vref on the drivers are all the same? Also, you could try swapping the drivers into a different socket to see if that changes the slowness to another axis. Hope that helps