Author Topic: The CNC experiment build. (Read 50621 times)

NeoTech · « **Reply #50 on:** February 22, 2015, 04:42:31 PM »

Yeah one of the designs i have looked at when doing this is this:

One of the problems with this machine is that it cant "touch off" on the table corners actually. It cant reach there with the mounted palette in the picture.
And the movent in X is really limited.. Its a chinese hurco clone.

RotarySMP · « **Reply #51 on:** February 23, 2015, 12:55:05 PM »

That is the trade off. What is more important to you - more travel, or more rigidity?

I posted a few pics of my E/G test piece here:
http://www.cnczone.com/forums/epoxy-granite/30155-epoxy-granite-machine-bases-polymer-concrete-frame-405.html#post1653506

Mark

NeoTech · « **Reply #52 on:** February 23, 2015, 01:03:13 PM »

Nice, im guessing if you had gelcoated the inside and cast "wet on wet" into that you would have a somewhat smooth surface. =)

Atm im having issues with swedish vendors.. they will sell me 10kgs of resin, but not 100kgs. And on top of that i can find crushed aggregate but not smooth pebbles - apparently all pebbles and such is imported and are of danish or czech origin.

Need to find a different source for slow curing resin, apparently one without solvents so its not flagged as hazardous.

RotarySMP · « **Reply #53 on:** February 23, 2015, 04:10:30 PM »

The surfaces in contact with the tape are very smooth. I think a gelcoat is unnessary for what we are doing. The only defects in surface finish are just from lack of preparation whete I didnt bother getting the way smooth, or lack of vibration.

I also dont know why people plan to paint E/G. A little carbon in the mix and it looks great.

If you want to make a pebble path in your garden, the pebbles are imported from flat muddy Denmark into granite Sweden? Hope no Norwegians are ready this 😁
Mark

NeoTech · « **Reply #54 on:** February 23, 2015, 04:20:32 PM »

Well they dont sell Smooth pebbles for path, i dont think ive actually ever seen it even.. you can get coarse pea pebbles in 2-5mm that will hurt your feet tho .=)

Sid_Vicious · « **Reply #55 on:** February 23, 2015, 06:12:30 PM »

Have you considered polishing the pebbles like they do with stones in jewelry. A machine like a concrete blender knocking the sharp edges of each other (don't remember the correct name of the machine now, Tumbler maybe)

NeoTech · « **Reply #56 on:** February 23, 2015, 06:23:43 PM »

No not really, but now i do!. That would probably work - i need to get me a concrete blender im guessing, but a flat top blender would probably be what one would want.. need to take a dive into the adverts.

Sid_Vicious · « **Reply #57 on:** February 24, 2015, 05:30:02 AM »

There are a lot of videos on youtube about rock tumbling that might give you some ideas on how to do it, but it looks like that it takes some time and are a lot of noise from the process. I'm not to sure that a toploader is the answer because a sideloaded one shifts it more around at least in my mind.

NeoTech · « **Reply #58 on:** February 24, 2015, 05:31:40 AM »

Yeah sideloaded "falling tumbler" throws it around more, and puts alot of more air into the mixture as well. and i imagine one would wanna keep as much air as possible out of this. =)

Sid_Vicious · « **Reply #59 on:** February 24, 2015, 05:39:12 AM »

If you look at the videos you will see that most of it are in closed containers filled with water and some grit I was just using concrete blender as an example.

Sid_Vicious · « **Reply #60 on:** February 24, 2015, 05:48:39 AM »

Another source of rounded pebbles could be the stones they use in bottom of fishtanks check the local zoo shop

vtsteam · « **Reply #61 on:** February 24, 2015, 08:02:37 AM »

Don't you have any mountain streams?

NeoTech · « **Reply #62 on:** February 24, 2015, 08:18:17 AM »

Nah i dont even have any mountains. =)

vtsteam · « **Reply #63 on:** February 24, 2015, 09:07:00 AM »

I mean in the country! You must own a car..... and probably a shovel, yes?

NeoTech · « **Reply #64 on:** February 24, 2015, 10:07:58 AM »

Ah well that i have, but still not really any mountain streams.. I live in the country of thousand lakes.
And most waters is protected, you cant just go dig anywhere you like. Ah well i could until i get caught but you know.. rules..

vtsteam · « **Reply #65 on:** February 24, 2015, 10:41:28 AM »

Quote from: NeoTech on February 23, 2015, 01:03:13 PM

..... - apparently all pebbles and such is imported and are of danish or czech origin.

Is this what we're talking about having no rounded stone in the entire nation?

NeoTech · « **Reply #66 on:** February 24, 2015, 10:47:54 AM »

Well i think you need to know a bit about our country before you getting into that.

We do have a lucrative market in crushing existing granite deposits into makadam, and we do have alot of sand and other earth materials for sale.

But what we are talking about here is pebbles, washed stones out of water areas, lakes, rivers and such. Almost all the water in sweden is protected from exploitation. Companies are literally not allowed to dig in them. And so arent we as citizens either. So making a product out of that resource is basicly illegal. And well the punishment doesnt really fit the crime. Even if you are a landowner arent you allowed to dig into or change these waters. Or actually really exploiting them. Because of one law.

That here is called "Allemansrätten", its kinda unique, but it make all of nature accssible to anyone, even other peoples owned land. But it also comes with the responsibility to not interfere with that nature for profit or exploitation.. This governs alot of our thinking regarding enviromental issues.

vtsteam · « **Reply #67 on:** February 24, 2015, 11:09:43 AM »

Neo I wasn't thinking of removal from streams themselves, but streams move and leave deposits. This is what is normally used for stone. My state is highly environmentally conscious, and unless land is posted, like your laws, it also is available for recreation. Similarly it would be illegal to dredge rock from a stream here as well. But a landowner or gravel operation would be permitted to remove stone from areas where a stream no longer flowed.

The main reason I suspect you are having difficulty finding rounded stone is that crushed uniform stone is more valuable for concrete than round -- it isn't economically useful. Your particular purpose is flexible deadening of vibration, which is quite different to concrete purposes. But I bet if you tried you could find someone who has access to a legally available small quantity you need on his property. I mean the amount you want is tiny in commercial terms.

NeoTech · « **Reply #68 on:** February 24, 2015, 11:13:05 AM »

Yeah you are prob. right. Just takes crapload of time to get hold of anyone.

And you are correct my volumes is way to small to be interesting for most commercial companies. They can and will sell me 20kg bags of the stuff for a crazy overprized sum of about 30 euros a bag.. And then i need about 45 bags of the stuff in assorted sizes and grades.
Just need to keep looking, or take a vacation to germany, the land of opportunity - and cheap industrial supplies it seems. =D

Henning · « **Reply #69 on:** February 24, 2015, 12:22:18 PM »

Quote from: NeoTech on February 24, 2015, 11:13:05 AM

Yeah you are prob. right. Just takes crapload of time to get hold of anyone.

And you are correct my volumes is way to small to be interesting for most commercial companies. They can and will sell me 20kg bags of the stuff for a crazy overprized sum of about 30 euros a bag.. And then i need about 45 bags of the stuff in assorted sizes and grades.
Just need to keep looking, or take a vacation to germany, the land of opportunity - and cheap industrial supplies it seems. =D

I may be misunderstanding something here, in which case i appologise, but smooth river rocks must be available?
Here's a page from Norway: http://www.maxbo.no/Produktkatalog/Uterommet-(Hage-og-fritid)/Heller-og-belegningsstein/Dekorstein-Arctic-Elvestein-25-40-20-kg/p/867546?gclid=CJXdsaGL-8MCFaLOcgodMm8A2g

20 kg. for ~10€. If you buy a lot a better price is a given. I also know this is a byproduct any place where they take out a lot of sand from old seabed and here at least you can go there with a trailer and fill it up for not much money?

NeoTech · « **Reply #70 on:** February 24, 2015, 12:51:26 PM »

Henning, been looking all over this god forsaken country, most of the smooth decorative stone, is imported from either Denmark or Czech for some reason. And as you would know im guessing shipping anything in the nordic region tends to be quite expensive. So that same bag from Maxbo, we pay around 278 sek for that bagged in stores.

But as you are suggesting a round trip to norway would prob. not be out of the question. Anyway im considering to see if i can use concrete gravel seems like people on one of the swedish forums has actually have some success with that and pool sand.

RotarySMP · « **Reply #71 on:** February 24, 2015, 12:57:34 PM »

Here was us thinking that Sweden was the promished land of swedish chef and blonde swedish flight attendant with generous natures and questionable morals. Your are seriously damaging our illusions Neo.

Henning · « **Reply #72 on:** February 24, 2015, 12:59:12 PM »

Well, let me know if you need any help!

I went to a local sand and gravel company some years back and filled a trailer with some larger stones which they find in the sand for 400 NOK. Probably close to a ton. They just had various heaps of different size stones which you helped yourself to and then paid on the way out.

I would never in this life expect to find anything cheaper here than in Sweden. I'm like this now:

NeoTech · « **Reply #73 on:** February 24, 2015, 01:04:48 PM »

Well, Henning, i have actually on more than one occasion went to Norway for buying boats.. They are cheaper there as well. =)
But you are right, almost everything are usually more expensive in your country.

Henning · « **Reply #74 on:** February 25, 2015, 06:55:30 AM »

Boats too?

I'll be damned!

Not much else though. Certainly not good tools and machinery

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Author Topic: The CNC experiment build. (Read 50621 times)