[jhudler]

Does anyone have a E/G-Premix, a bag of reasonably priced preweighed premixed materials/aggregate for EG use?

This is one of the problems (for lack of a better word) of EG.
You can pay almost as much for shipping as the raw materials themselves.

For example: buying 100 lbs each of AGSCO #6 alox,#4, #2, and #2/0 quartz is about $220 plus $170 (400lbs) for shipping. 800 lbs was $260 for shipping.
When you buy over a 1000 lbs you start getting price breaks and better shipping. 22,000 lbs you get railroad car.

Jack

[the4thseal]

where are you buying the components?

[jhudler]

where are you buying the components?

I bought some from AGSCO, and looked at US Silica only because the plant that produces the grades needed is close to Dallas,TX. Well close enough so that shipping is borrowing a truck and driving there.

US Silica produces ground quartz not crushed like AGSCO. It has been suggested that crushed is better than ground however, I/we don't have any data to confirm this (unless I missed that memo).

Zeeosphere's are available in almost every market in the US and some in Europe. Pricing for single bag should be around; $30 for G-800 and $37 for G-200.

Note: For those that are going to your home center or landscape supplier for crushed GRANITE; make sure it is NOT DECOMPOSED Granite. Descomposed granite is made from crushed friable granite.
Anything friable in EG is bad (structurally).

[roach]

the mix was for infills
we use different mixes depending on the spec of the job
still not sure what you mean by 5% voids lol we compact the mix down forcing the air up and out
could you work out using your formula a 1x1x1 metre block see what weight you come up with ill see if i get summat diffrent
all our granite is kiln dryed you wont dry it out any other way it may look dry but it aint :P
i cant find any spec sheets for reichold resins for visc/ep ind/ep equi and so on you know it?
we pay about £800 Per 10 ton load for granite
£4000 per ton resin about the same for the hard
it may have been posted before rent one of these to vibrate
http://images.google.co.uk/imgres?im...3Doff%26sa%3DN
http://images.google.co.uk/imgres?im...3Doff%26sa%3DN
might be able to rent one

[roach]

surface plates can be done we do them only if alot of inserts of odd shapes
bear in mind the surface will be "RESINY" wont see the stone very well when you grind our granite brings out the stones ill take a pic if i remember
can u scrape?
old cast iron surface plates are next to nothing use them as you base plate for moulds

[roach]

what you lot need is teamspeak
http://www.goteamspeak.com/?page=downloads
TeamSpeak - Downloads
then u can talk to each other at the same time

[roach]

what do you use to measure flatness?
talyvels?

[jhudler]

what do you use to measure flatness?
talyvels?

Laser Interferometer

[roach]

i used to work for taylor hobson
measurement specialists
what can you measure to?

[jhudler]

Let see; Velocity, Linear position to 10 nanometers, Angular to 0.1 arcseconds, Flatness to 30 nanometers, Squareness to 1 arcsecond, and Straightness to 10 nanometers.

[BobWarfield]

Amazing results are possible with a cheap laser level and clever setup:

http://www.cnccookbook.com/MTLaserMetrology.htm

Plenty good enough for amateur machine construction. I will be amazed if an E/G machine can be cast to a tenth of accuracy.

Cheers,

BW

[lgalla]

It would be great to get sand and pebbles locally and only have to order and ship the micron sized parts.Lowes has a ton of different sands.Play sand,concrete sand,sandblast sand,river rock,pea gravel etc,at under $4.00/50lbs.They claim to be washed and kiln dried.
Safe playsand is not a product you want.It is ground marble.The proper stuff should have warnings of free silica content.Don't use limestone screenings or marble chips.If the gravel has sparkles it is most likely granite as the sparkles are the quartz content of the granite.
At 8cents/lb sounds like a bargoon to me.
http://www.lowes.com/lowes/lkn?actio...30-38838-92130

[ckelloug]

the mix was for infills
we use different mixes depending on the spec of the job
still not sure what you mean by 5% voids lol we compact the mix down forcing the air up and out

Based on my calculation of the density of your mixture, (which is subject to several Beta constants I don't have and an exact particle distribution I don't have), I predicted that you could have 5% air bubbles by volume. This was based on my predicted volume of aggregate and the 7% by weight epoxy that you specified. If I had a few pounds of each of your aggregates, my predictions would be better most likely.

could you work out using your formula a 1x1x1 metre block see what weight you come up with ill see if i get summat diffrent

I get between 2200kg/m^3 and 2300kg/m^3. This is dependent on the density of your epoxy which I have taken as that of ours at 1.1 g/cm^3.

all our granite is kiln dryed you wont dry it out any other way it may look dry but it aint :P

Water has a terrible effect on making stuff not stick like it should. I and others have been considering relatively high vacuum.

i cant find any spec sheets for reichold resins for visc/ep ind/ep equi and so on you know it?

Datasheets Attached

Resin
http://www.cnczone.com/forums/attach...9&d=1180623213
hardener
http://www.cnczone.com/forums/attach...8&d=1180623213

[quote]
we pay about £800 Per 10 ton load for granite
£4000 per ton resin about the same for the hard
[Quote]

I think prices vary quite a bit between bulk and tiny purchases especially for aggregate. At retail prices from uscomposites, about $14,000 (7000£) for a ton of resin and half a ton of hardener at retail prices 1 gallon at a time. Prices go down at the wholesale level but I don't know where my last quote on 55 gallon drums went/. None of this includes shipping

it may have been posted before rent one of these to vibrate
http://images.google.co.uk/imgres?im...3Doff%26sa%3DN
http://images.google.co.uk/imgres?im...3Doff%26sa%3DN
might be able to rent one

An excellent idea.

Regards all,

Cameron

[jhudler]

I've washed and dryed all the aggreate I've ever bought.
Only now do I realize I took this part of the process for granted.

When I get aggregate (sand or gravel) I wash it in a 5 gallon pail until the water runs clear, this removes anything water soluble.
Add 16 oz of Muradic Acid (pool store) in 5 gallon pail with the sand and water, and using a paint stirrer, whip it up for 5 minutes to remove the limestone and ferrous metals, then flush with fresh water until clear.
Place the batch in the oven at 400F/200C for 2 hours and seal in a 5 gallon bucket until ready for use.
Note: If you do this in the kitchen make sure the pH of the wash water is neutral. Otherwise the grills will corrode or rust from the highly aggressive hot concetrated acidic vapors!

I've tried it with sand that wasn't completly dry, which resulted in an extremely weak mixture.

[Eson]

Would Ultra sound washers destroy the aggregates?

[jhudler]

Would Ultra sound washers destroy the aggregates?

No, in fact that would be a very good way to wash it.... hope it's big!

[roach]

yes should be about 2500kg/m for that mix we use ciba geigy resin (as it wa#)if i was in the states id send you one of our test blocks
looking at the sheets our resin alot better alot better wetting properties

[roach]

you can buy kiln dried sand http://www.diy2u.net/products/kiln-dried-sand_CE01.html
Kiln Dried Sand

[jhudler]

we use ciba geigy resin

So that would be Huntsman Chemical now (http://www.huntsman.com/advanced_mat...fm?PageID=5668)

[roach]

yep :P