Very interesting! I love the love watching the interesting places your hobby takes you. I don't have much personal interest in model aircraft, but the techniques for building things are broadly applicable, and you do an excellent job of describing what it feels like to learn, and the types of issues one might run into. I find this much more helpful than many youtubers who focus on the successful result, by which time a lot of the journey has been forgotten.

Use rattle can clear coat on those rusty rails! Remove them and clean them then put a couple coats on them. Put them back on and grease only were contact is made. You won't have rust issues anymore.

When you want to put a new MDF sheet on create a program for your bolt pattern. Place the new sheet on the old and offset your origin an inch in the long direction that way your holes are always accurate and you wont hit the hold down hardware.

@iforce2d

2 жыл бұрын

The machine can only reach 6 of the 20 holes I wanted. I suppose it would still work with bolts only inside the work area, but less ideal.

Perhaps worth connecting the cable shield to earth/chassis, at least at one end.

@BenMitro

2 жыл бұрын

Only at one end.

@willalexander6834

2 жыл бұрын

The shield must be connected to earth for it to do anything. And yes only at one end.

@iforce2d

2 жыл бұрын

Not being earthed doesn't mean it will do nothing. Just not as effective.

Stunning Chris!... You've open the gateway to a whole bunch of new adventures. :o) Re the dust; I had a very cheap drum-type shop vac many years ago. It was very poor quality, but the thing that made me ditch it was the filter, which clogged very quickly. Cleaning it resulted in breathing as much dust as if I had never used it. These days I use a small domestic cleaner that we bought thirty years ago. It had staggering suction, but was never used because it had a pathetically small fabric dustbag. Five years ago I made a thien-baffle separator for it, using ideas gleaned from numerous KZread videos. It's not perfect, but absolutely worthwhile. I mounted it in a simple trolley with a flat top to lay tools on, side hose hooks, cord storage, power plugboard, and an anglepoise work lamp. It has become my best workshop buddy. :o) Thanks for everything... don't stop having fun.

I always enjoy your videos. Great stuff 👍

The way to avoid false triggers on your limit switch lines is to ensure that they're all configured to be Normally Closed switches which are tying the line to ground whenever they're not in fault. Having the line in a low impedance grounded state like that makes it near impossible for signals of any magnitude to be coupled in. I recently built some little buffer PCBs for my proximity limit sensors using an N-channel mosfet to hold the line at ground from right up at the sensor until it triggers. Happy to share more if needed. EDIT - I should finish watching before I comment. I see you have the same sensors as I did. Your way of solving it (change to NC sensors) was probably easier ;-)

The shielding on your cable needs to be connected to ground, otherwise is isn't doing anything. Connect at one end only on the side closest to the ground of the thing it connects to, or main ground connection.

@iforce2d

2 жыл бұрын

It's not doing nothing, just not as effective.

Wow, I am very impressed with the result. I think you can be very proud of the self-developed milling machine. Of course, there are limits to the stiffness and therefore to the materials that can be machined. But for aluminum, plastics, wood and much more, great results can be expected. I am already looking forward to the first applications on your model airplanes. Great work!

for this design, i recommend running a roughing pass before the contour op. KM3.3 has some routing improvements in outline mode. tabs cause a routing issue, which is a known bug and will be fixed

@iforce2d

2 жыл бұрын

Yes, that's what I was doing in the video. I made an account on your forums the other day so I might start some discussion there sometime.

Dust collection became also a priority for me after flattening my wasteboard. With these kind of cutters that don‘t cut on the inside, the path should either ramp into the material or come in from outside the stock.

and if you can, put spindle cable far from limit switch cable. because spindle is hi frequency and put noise on limit switch and use shilded wire for wiring stepermotors and limit switch

@iforce2d

2 жыл бұрын

Yes, all wires are shielded. It's not frequency so much as high voltage (240v on spindle) that can cause issues.

Looks great Chris. As other people suggested you need to connect the cable shields to ground to be 100% effective.

That was great! Thanks.

Spindle tramming is actually pretty easy with a piece of sturdy wire. 1. "Flatten" an area on your wasteboard (or some sacrifical piece). This will have ridges because of bad tramming. 2. Use a decent enough parallel (eg spirit level) to create a flat reference surface on the Y axis (where you have to shim the spindle). 3. Stick a thick wire into the spindle and rotate in a 10-15 cm radius to see which side it is tilting and by how much. Correct the tilt. 4. Repeat in the X direction by tilting the spindle left and right. On a very lousy desktop CNC this gave me close to mirror finish with aluminium.

About the noise in 17:14. Notice that cutting blades are not on the whole diameter of the cutter. So when the cutter moves the blades cut material in front of and also the material under the cutter and the sound is different. You can avoid big chunks of wood breaking from the material. It's all about correct tool path and tool milling direction. I can help you with correct tool path if you want. Greetings.

@iforce2d

2 жыл бұрын

Yeah I know about the milling direction, I showed a demonstration of the difference in the video. My point there was that kiri:moto settings don't work :)

Machine is looking good. You can use the old waste board as a template for the new one. Good idea to use a cyclone and drum in line with your dust collection, this will save cleaning your filter with very fine dust. Have a look at Dolphin software for your Cad and Cam. Cheers Dave

@srp01983

2 жыл бұрын

Or draw up a file to drill the baseboard holes, then use the same file to drill the holes in subsequent replacement baseboards. That’s what a cnc is for!!

@iforce2d

2 жыл бұрын

The machine can only reach 6 of the 20 holes I wanted. I suppose it would still work with bolts only inside the work area, but less ideal.

@srp01983

2 жыл бұрын

@@iforce2d Ah ok. Thinking about it my cnc can’t get everywhere on the board either. Great machine though. WD40, grease or anything similar will help with the rust problem. Or there is a really good product called acf50 that will give you a less sticky protective film (so dust and chips will be less likely to stick to the rails and screws). Thanks for the video.

@PiefacePete46

2 жыл бұрын

@@srp01983 : That was my immediate thought. Now I have seen the reply, I am glad I resisted the urge to comment! :o)

48:12 hey i have the same kitchen scale 😂😂

Slower to fast plunge on on big bit on motor is easier to cut once moving because you are only cutting in front of you not the whole bit .I would use fiberglass resin on prop instead of varnish also , Its really coming along Chris looking forward to many more of these videos Take Care

@iforce2d

2 жыл бұрын

Yeah I should have thought of that. At the beginning it's cutting with the inner face of the blades as well, just for a moment.

Great first attempt alright, thanks for being side tracked, good outcome.

impressive

There is great product Acp which is used on motorcycles,, try that. It will collect less debris.

One found having a 2.5kg weight (scrap metal, iron, lead) in bottom of shop Vac stops them tipping over when in use, Most are poorly designed being top heavy, with small footprint.

@23:17 lol... sanity is a fragile thing ; )

As an electrical contractor, a pet hate of mine is cable ties cut with side cutters. .......🤷‍♂️🤷‍♂️ It leaves an edge (as clearly seen in the beginning of your video) akin to a stanley knife and at some time or other one will brush up against it and tear skin off like a razor. Answer is to trim off with a sharp knife , flush with the ratchet boss. There is a dedicated tool for the job but usually beyond the finances to justify for the hobbyist. I have 3 which covers different size ties. You say "shielded cable" but the shield doesn't appear to be connected to any ground anywhere. Grease would work fine but Zinc spray would be even better for longrun. Would need pulling apart again so the former would be my choice. Overall, that is SOME machine....great work. Yeah...wheels are sh****t. What's wrong with using the old waste board as a template..??

@iforce2d

2 жыл бұрын

I usually run my finger over the cut edge to check if it's sharp, and file or snip a bit more off if it is. Yeah you're right, I could just use the old wasteboard, assuming it's intact enough.

Hey Chris. Looking great as usual. Regarding making the prop - I'd start with a clearing pass before you try doing the 3d finishing. I know I said this on your last video, but for doing 3d cutting you should really take a look at MeshCAM.

I don't know why, even my table saw table rusted this season. Never had that problem at least over the last 4 years I've had it.

If you put the prop test rig on top of that fence post, it will get more air and give more thrust....🤔🤔😳🇬🇧

Looks like the reason you’re not cutting the corners with the surfacing bit is you need less stepover, I use 60 to 70

@PiefacePete46

2 жыл бұрын

Fierceflyer55: I had to read your comment more than once before I woke up. My mind said "No... you want a bigger stepover, then I realised that, of course, that is numerically smaller. Is the glass half full, or half empty? :o)

@iforce2d

2 жыл бұрын

Yeah I get mixed up with stepover and overlap too, each time I use a new software I have to stop and think what it's meaning. At least when it's 50% there's no possibility of a mistake :)

Just rub the grease on it so there is 0 chance of cross contaminating your grease, and its once less extra thing to worry about once its on there.

You dont have to worries about shaking hand, when you have rock solid cnc

why not make a cyclone dust collector for the vacuum cleaner ?

@BenMitro

2 жыл бұрын

That nozzle on the inside of the vacuum cleaner bucket did create a cyclonic action, allowing the heavier stuff to fall before the air is passed through the filter. I think Chris's idea of adding a bucket to the bottom will improve this effect, though he may need to figure out a way to alter the tilt of that fixed nozzle.

@PiefacePete46

2 жыл бұрын

Mumbai Verve: It is at about this point that many CNC router builders discover how much they need effective dust collection! :o)

And smaller stepover

@iforce2d

2 жыл бұрын

Yes, that's quite right. This was only a quick test as my first ever double-sided experiment. I was actually never intending to put it on a motor. Just yesterday I made another prop design from scratch that could be used for actually flying a plane, and for that I will be using about 0.8mm stepover.

If you are feeding 12 or 24 volts to your limit switches, You would not need shielded cables for the them, the noise levels compared to the signal coming from the limit switch is negligible!

@iforce2d

2 жыл бұрын

Right, that's what I'm hoping too.

@PiefacePete46

2 жыл бұрын

@@iforce2d "Once bitten, twice shy"? We all held our breath, and wept with you every time the little machine locked up from crosstalk spikes! A little bit of over-spec now might save hours of frustration later.

Grok!

Great video as always. Silly question, why didn't you use the CNC to locate the MDF mounting holes so that you can just rerun that program when you need to replace the MDF and thus the holes will be in the same position on the new piece.

@iforce2d

2 жыл бұрын

The machine can only reach 6 of the 20 holes I wanted. I suppose it would still work with bolts only inside the work area, but less ideal.

@jon_raymond

2 жыл бұрын

@@iforce2d That makes sense. Your use of the thread in transfer punches will work just as well.

Very nice. Plan on revising your stacked slices method for cnc instead?

@PiefacePete46

2 жыл бұрын

Robert Bender: I did wonder when I heard his reference to the "rctestflight" channel, if we might see some fuselage half-shells and and wings done totally by CNC, as shown there on a recent tri-wing slow flyer video? Whatever happens, I will be watching with enthusiasm! :o)

@robtomben

2 жыл бұрын

@@PiefacePete46 As will I!

@iforce2d

2 жыл бұрын

Yes, most likely. I'll have to experiment with XPS machining before I decide whether to go ahead with such a big job, but the plane in my recent community post is being designed to fit within the capability of this machine. I also located a source of the XPS boards that I thought were no longer available so I have plenty of material :)

@robtomben

2 жыл бұрын

@@iforce2d So many ways to do it these days, awesome.

Hi, I have a question for you, if possible. I would like to know about how much it costs to build the Farm hopper. Thank you so much! P.S. Your videos are amazing!

Has the Ryobi shop vac worked out OK? I will probably have to replace my little Kenwood sometime... age is catching up with it; rubber seals splitting etc.

@iforce2d

2 жыл бұрын

Seems to be doing fine so far. As you mentioned (I think) it's very light and tips over easily, especially when there's only foam inside. Otherwise no issues. If buying again I think I would try to get one with a speed dial to slow it down a bit.

Why not use the cnc itself to drill the waste board mounting holes. Then you can just repeat the program with future boards.

@iforce2d

2 жыл бұрын

The machine can only reach 6 of the 20 holes I wanted. I suppose it would still work with bolts only inside the work area, but less ideal.

does the shield on shielded cable really do something, when it is not connected to anything ?

@Terry_Fritz

2 жыл бұрын

You noticed that too? Should be grounded at both ends in MHO.

@pete3897

2 жыл бұрын

@@Terry_Fritz better at one end only, so as to not introduce unintended ground loops

@iforce2d

2 жыл бұрын

Not as much as if it was grounded. I wasn't gonna bother but I can already see a half-dozen comment about it....

hi, why you dont use fusion360 to generate Gcode? it's very smart and use is simple. and for better surface finish with less time you can use a bigger ball nose with the same stepover

@iforce2d

2 жыл бұрын

Because it doesn't run on Linux. 7mm is the biggest tool I can use with this spindle, but 6mm seems to be the most common size tool you can actually find.

Also, could you not use the machine to drill the holes for the waste board. In the very least, the relative hole distances will be consistent when you need to replace the waste board.

@iforce2d

2 жыл бұрын

The machine can only reach 6 of the 20 holes I wanted. I suppose it would still work with bolts only inside the work area, but less ideal.

Why not do the waste board holes in CAD and then just use the machine itself to drill them? That way you can spot drill the holes in the next waste and they'll be in the same place automatically

@iforce2d

2 жыл бұрын

Yes, of course that's how it should be done. This was never intended to become a full prop, I wasn't even expecting to mill both sides when I started.

@DoRC

2 жыл бұрын

@@iforce2d I was talking about on your waste board

@iforce2d

2 жыл бұрын

The machine can only reach 6 of the 20 holes I wanted. I suppose it would still work with bolts only inside the work area, but less ideal.

@DoRC

2 жыл бұрын

@@iforce2d ah

the new vacuum you bought does not look like a bagless vacuum to me. Are you sure it is bagless?

@iforce2d

2 жыл бұрын

I don't recall saying it was, but there are no bags anywhere and it calls itself wet-and-dry. Surely a wet-and-dry vacuum would not use a bag?

@BuzZ.

2 жыл бұрын

@@iforce2d oh, I just looked Kärcher WD3 vacuum manual for the exact same design of vacuum. And it says "do not use filter bag for wet vacuuming" "To vacuum fine dust, use the filter bag"

@BuzZ.

2 жыл бұрын

@@iforce2d so when vacuuming MDF dust it might clog up really fast without the bag

I love MDF dust!

@PiefacePete46

2 жыл бұрын

Gatis Ozols: Change that to the past tense and it will make a great inscription for your headstone!

@gatisozols

2 жыл бұрын

@@PiefacePete46 it is a sarcasm😁

@PiefacePete46

2 жыл бұрын

@@gatisozols : So is mine. 😋👍

Hi, I am an electronic engineering college student living in Korea, and Arduino has a problem with slowing down, so can you check the code?

@iforce2d

2 жыл бұрын

I think maybe you commented on the wrong video

I have no Linux or (obviously) LinuxCNC experience, but I thought it was performing all the operations you needed? What have I missed?

@iforce2d

2 жыл бұрын

Yes, LinuxCNC is fine. The issues are mostly with the CAM software that generates the toolpath, that's not LinuxCNC's job.

@PiefacePete46

2 жыл бұрын

@@iforce2d Gottit. LinuxCNC is a Linux alternative to Mach 3 or 4 etc. I was crediting it with being the complete package... Pretty picture in ----- G-code out. Thanks.

Too aggressive! I find best results with 4mm end mill followed by 2mm tapered ball mill for jobs like this.

@iforce2d

2 жыл бұрын

The larger radius allows a larger stepover while still keeping the surface flat. No way I would want less than 6mm ball end for this. The only reason to use a smaller ball end would be if there are smaller features that a larger tool could not reach into.

Why not just use fusion 360 for windows?

@iforce2d

2 жыл бұрын

Because I don't use windows. I do have it on a hard drive I could swap into my main computer, or use it on the laptop, but neither of these are appealing options.

@FufsowyFufs

2 жыл бұрын

@@iforce2d For cad it's awesome. I've never tried the cam on it but I've heard many ppl recommend it. You should give it a shot even if through wine or vm

First

@mumbaiverve2307

2 жыл бұрын

Second :P

Also, MDF dust sticks in your lungs and is bad for you. So I hope you're wearing your dust mask while you're doing this stuff.

@PiefacePete46

2 жыл бұрын

mozismobile: Yep... at the time you might get a raspy throat and coloured snot! Sometime later you find out that your lungs are screwed, and it's time to start shopping for a coffin. :o(

@andriancic

2 жыл бұрын

@@PiefacePete46 or you can make it with your new CNC )))!

Stewart from kiri moto tried to leave you a comment about the settings and order of operations but they kept getting deleted. He's got a discord server for kiri moto if you want to get his suggestions on how to get the most out of kiri moto for this kind of job.