home made epoxy granite cnc - part 3 - base of the Z axis

[@ActiveAtom]

Pink granite surface plate only the best toughest one made, nice to see and have you share. Sure is coming along well we are really excited to see this come through to the end and begin making a machined pass, some cuts we think you will have a GREAT machine here. Thank you. Lance & Patrick.

[@joergbeigang]

Thanks for your comment! The pink granite plate is indeed a scrap piece I got from a stone mason. Most of it is reasonable flat, I know where it isn't , so I can live with it :D Once I made a solid connection between the base of Z and Y, I'm going to be more optimistic as well. Take care guys!

[@samc5898]

A fantastic build series that I've stumbled upon. Keep up the great work, can't wait to see the end

[@Bob_Adkins]

Put your indicator on 1 far end of the rail, then lay your hand in the center to warm it. Your indicator will move a thou or 2 within 2-3 minutes. What a great project, BTW. Love it!

[@AKAJSANGO]

Nice job! i'm waiting for the part 4

[@IronForestKnives]

Great project! I am considered building a larger milling machine using this method. Instead of continuing to modify my Grizzly G0704

[@DeminVictor-xk9pk]

Просто молодец!!! Станкостроитель от бога!!!

[@KravchenkoAudioPerth]

Have you tried any vibratory leveling of your epoxy sand mix? A half sheet vibrating sander is good at this. Without using sand paper. Just the rubber pad. Mark

[@joergbeigang]

No, I did not so far. With those small things I'm casting, it works for me quite well just with stamping, using pieces of wood in different sizes. But thanks for the tipp with the sander!

[@АндрейБирюков-м7ш]

Realisation of this project - super effecive! Power and time for this work!

[@bobweiram6321]

Did you use rolled steel for the bar rail supports? If so, it might explain the warpage after milling. Rolled steel releases tension after it's machined.

[@Bugcatcher3d]

Awesome project. Granite mix seems a bit dry and course for that size project for me. But still awesome project none the less.

[@vladnickul]

Is epoxy concrete stiffer then "real" concrete? I thought polimers/epoxy is kinda flexible....

[@martinum4]

Awesome Project, can't wait to see more soon!

[@muggzzzzz]

You have an outstanding project here! What materials do you plan to mill with it? And what precision you estimate to achieve?

[@joergbeigang]

I'd like to mill mostly aluminum with it, and I'd be happy if it would be precise enough to mill a proper bearing seat...

[@muggzzzzz]

@@joergbeigang I would be very glad for you if you'll get what you expect, and I'll be watching your project! Maybe, some day, I'll remake my flywood cnc mill to something like your epoxy-granite cnc...

[@aarondcmedia9585]

Was that first layer that you brushed on gel coat or something else? Making good progress.

[@joergbeigang]

It's a gel coat. I'm using it, because I'm scared that the sand or gravel can sand off the wax surface while casting.

[@aarondcmedia9585]

@@joergbeigang cool. I saw someone else do the same to prevent the EG from sanding off the mould release during vibration post-pour. Did you vibrate your mould post-pour?

@@joergbeigang any product ref/link please? Also what release agent did you use? Rarely seen demoulding going that easily! Or is it the gel coat?

[@joergbeigang]

No, I didn't vibrate. On such a small piece it worked for me without. On huge pieces it's a different story I guess

[@joergbeigang]

I used this wax: 500 ml Trennwachs (flüssig) - Trennmittel für Epoxidharz und Polyesterharz www.amazon.de/dp/B0076ND9B6/ref=cm_sw_r_cp_apap_me1vygGCC79p2 And that's the gel coat: 500g Epoxidharz Gelcoat 4300 + 275g Härter 390 www.amazon.de/dp/B00C51Z87W/ref=cm_sw_r_cp_apap_B8ChVcgTTvO9O

[@Δημήτρης-η4ρ]

You should have connected the main reinforcement with the part that the column Bolts in the base, you have a week spot between them, maybe weld them together on a bolt though the reinforcement plate.

[@XavierAncarno]

Can’t wait for the next part

[@durangotang1681]

Sweet. How much epoxy did you use for the column? Bought a manual mill and a lathe for the time being with the intent to make a lot of the parts myself when I do my eg build.

[@joergbeigang]

I used about 12 to 13 percent. But it depends a lot on the sand/gravel mix (as less space there is between the particles to be filled with resin as less you need). You got to do some tests before.

[@sto2779]

What is this white chemical you are brushing to the casting?

[@elbastomuerto]

Hi, tell me the proportions of mixing epoxy and filler please. granite filler of different fractions and quartz sand? I suspect that the epoxy filler in the region of 20-25%?

[@joergbeigang]

I used sand and gravel from a local hardware store. I've written about here: dangeroustools.com/2019/10/23/1084/

[@Made2hack]

Hi, what's the reason behind the gel coat at the beginning? Is that epoxy? Or some form of silicone? Thanks!

[@joergbeigang]

It's a thick epoxy. I use it as a first layer to protect the wax. I'm afraid the sand or gravel might scratch through it and then it wouldn't be so easy to get the piece out of the mold later on.

[@Made2hack]

@@joergbeigang Awesome, thanks!

[@w.dkalyan6234]

Sir namaste 🙏 How r u sir Sir if you don't mine please tell me the most of the people who are making epoxy bed they are using aluminium metal frame why 🤔? Because i want to make this epoxy bed for my milling machine but aluminium metal is very expensive for my budget 😔 sir can i use iron frame for my project please help me sir please

[@joergbeigang]

Steel is for sure the better choice. I'm not having the tools to work with steel in that dimensions properly so I went for aluminum

[@3dkiwi920]

Awesome video my man!

[@kabadaluk]

What is the name of the epoxy liquid?

[@ShopperPlug]

Would be nice if you explained what your are doing.

[@aliselviCNC]

What are the dimensions of sand and gravel

[@joergbeigang]

Can't remember, was a few years back now. Just do some tests, that's what I did before. Most important it's got to be very dry.

[@skjoldhjvrkstedsforening4930]

9:27 .. left .. we want more skin ..! 5 stars from Copenhagen your way. Always beers and sun here 4 you.

[@manudehanoi]

how is that better than regular cement/concrete ?

[@Vir9il]

From what I've read online, regular concrete will continue to cure for months, even years after you cast it. As it does so, it will slowly shrink / warp. Epoxy granite has much less shrinkage and cures faster. I think it also has a higher loss coefficient for vibrations, meaning that it dampens vibrations more. For a CNC machine, you want the body to be A) very stiff, B) not resonate or ring, C) not creep or warp over time, D) not break the bank ;)

[@donfraga6757]

good night what's the name of the epoxy

[@joergbeigang]

Can't really tell, there was no brand name on. Was looking for something with a slow hardener online. Bought two kg for testing and sticked to it. I'm sure there are better ones out there, with less shrinkage, but for the small volumes I made it didn't really matter

[@amwomt7528]

Great work Thanks for sharing

[@Exciting__Electronics]

Nice build dude, New sub 👍

[@mastermoarman]

what are the white bits in the sand?

[@joergbeigang]

It's gravel. Limestone I guess.

[@mobilekalakar]

Wow good job 👍

[@rsmi3449]

Why does everyone keep putting rock in the mix? Fine sand epoxy is all that is needed.

[@SergeiPetrov]

Then should the reinforcement be removed? The best composition of the mixture was found a long time ago. In this composition, the particle size increases from smallest to largest.

[@urrick33333]

very cool!

[@oliverrowe8648]

How much does it weigh?

[@joergbeigang]

Should be around 25 kg. The finished machine will be around 120 kg I guess.

[@Sastas]

At least on the end, you get your ring off. :D I'm still fear or something, that you will get the skin off from your finger with that. I have pics from my previous workspace. They arent nice.

[@joergbeigang]

Yes, I wasn't wearing it in the last scene. But only because I went rock climbing after getting it out of the mold :D But you're absolutely right, I should be more cautious with that!

[@АлексейКузнецов-ъ7ю8з]

@@joergbeigang "rock climbing"?! Have you thought about us? We will miss your films.

[@frijoli9579]

Really like what you're doing in these videos, but i'd rather the music was an after thought...

[@jankorkalainen5327]

Interesting

[@claeswikberg8958]

granite? silica more like it, not that i know if it really makes much difference. maybe someone can fill me in on that

[@Made2hack]

Granite is predominantly silica (silicon oxide).