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How did this test out on your tension machine?

Just my two cents on vacuum.
I wasted... err make that spent a lot of effort on this subject years ago.

It's just not worth it; and like you discovered, it's only worth it for making small...

Be sure to use some sort of fiber material; fiberglass or carbon fiber (chopped or whisker). Though the later is a bit expensive.

BTW: What speed are we talking about? And what's it timing (hope...

Checkout this patent application. Can you see how this would make mixing EG a WHOLE lot easier?!?!?
http://www.pat2pdf.org/patents/pat20140364540.pdf

Edit: I'm still going HOLY $&(^ Batman over...

I paint the surfaces (wood; plywood or MDF) with urethane based automotive primers and paints. This creates a smooth hard surface that can be sanded with extremely fine grit (I stop at 5000).
Then...

Wow can't believe this thread is still going with some of the same ole faces! Walter ever show back up? :)

I see people are using vacuum and vibration; good. Only I think 29.9 is a bit deep, the...

I think compression opens up a whole new bag of worms. Not that I wouldn't mind trying it!

For example; what happens if you glue two boards together and apply too much clamping force? You squeeze...

I'm of the mind that epoxy is expensive, so I try to minimize excess.
I do this by testing small batches, so I probably wasted the same amount.

Also you would have to design the mold to account...

Personally I like the marange model... stiff peaks! (chair)
You know air bubbles are the aggragate... well maybe it not such a good analogy... sure taste good though... hmm Lemon Marange pie. Off to...

That looks like an almost perfect mix but a bit runny. I would use less epoxy on the next run.
As for fine details; trust me it will flow when vibrated just like liquifaction during an earthquake....

I forgot all about the most vile and vicious Armour All death spray! The stuff is banned from my household.

Of course Silicone is your friend when used as intended. Just be aware of where your use it and clean up.

For example my workshop is my wood shop. Aerosolized Silicone release agent will...

Oh one other thing. Vibrate the bucket of EG before you pour it in to reduce entraped air; then pour into the mold. Then give it a few taps with the shaker or a very low setting while you pour.

Hi gang!

Silicone?!?!? that's no ordinary rabbit, that's the most cruel, vile and vicious rodent you ever set eyes on! (oops deprecated into Monty Python again... hmm could be defecated).
Just a...

It's not if you need it or not; but how you use reinforcement.
Mounting heavy steel way beds may require reinforcement support however; it depends on the design.

If the design requires...

CNCzone.com-The Largest Machinist Community on the net! > Other Machines > Epoxy Granite

http://www.cnczone.com/forums/forumdisplay.php?f=481

I/We asked and it was granted... however.

I...

This thread was started as a what-if... it still is, I think it should remain as the thread where we Experiment with diferent formulas of EG.

John, your thread is about practice, taking what...

That pretty intuitive, and doesn't sound like anything we don't already know. If he's commercial would he be willing to send you (Cameron), samples to test? What about pricing?

-Jack

Post machining of composite casting is always expensive.
Generally you design the mold and the parts to be embedded to the tolerances you need.
Or you can leave a hole or groove and grout the part...

Welcome the to group!

You can embed the guideways in the casting, or embed mounting blocks that are threaded for the guideways. In the later case, you can place solid mounting blocks and thread...

If you're creating something structural, then fill just won't do.

Steel fill has it's own inherent problems, namely getting it clean of oils and preparing its surface to bond with epoxy....

Here's what I worked out for vibrating 100,250, and 500 lbs (remember to add the weight of your table and vibrator).

Using .01" displacement as the maximum.

100 LBS Mass
80Hz (4800 rpm) -...

Remember this nugget I found.
Note: They have taken the page down... wonder why?

There maximum acceleration works out to 3.2 G's

<O:p</O:p
<O:p</O:p
Gordon Bennett!! 7000! Bit of overkill ehh?? :)
LOL! Bolt that to the workshop floor! Ready made earthquake!!<O:p</O:p
<O:p</O:p
(Well... it would be in the local...

I think he's being overly critical. That looks fine to me! Nice clean core, good distribution.
Looks like he poured an EG Top layer.


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Wait a second! That's Concrete not EG....

Well if everybody did that, then everyone would be out of a job, and money would be worthless; just like all the other comments you made.

Consider for a moment, the magnitude of components that make up an operating system.
Windows is order of magnitude greater compared to a dinky *nix based systems.
When Windows updates the computer...

Well it's fast because there isn't much there to update.

Cameron,
Have we run across an epoxy combination that won't outgas at 25 microns?

Might not be a problem for infusion (still have my doubts) however, deairing is another story. The bubbles just...

Just a note:
Lest we forget (John Wayne; She Wore a Yellow Ribbon).

Buying the epoxy and aggregate is 1/4 the battle. (Ignoring the 3385 previous posts :).

You now have to mix, vibratory...