Impregnating FUD with CA?

[Ed Kapuscinski]

Will do!

[chicken45]

Did you try impregnating with anything other than CA?

[CNR5529]

The bells there look to be twice the size of John's. That does change things.

Keep in mind that Nathan horns appear to be typically shorter and more flared out than Leslie horns. Also, it is unpainted and the clear-ish resin tends to somewhat distort what we see/can photograph. That said, the largest chime on mine is approximately 1.3 mm in dia and the smallest is 0.7mm in dia.

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I will also admit that I didn't bother putting in any of the extra fine details that @Lemosteam put in his, I just wanted a quick and dirty "close enough for a trainshow runner" horn. I would really like to see a closeup of how well FXD rendered the Leslie horn though! Can you really see the hex head bolts, or is it just rivet looking blobs? I am truly curious to see the results.

As my earlier photo kinda shows, supporting this thing was a tough job. Even though supports were placed in areas that will show less, there will be fine marks left over if you know where to look. That is in my mind the one advantage of FXD over the home use resin machines. Then again, I wouldn't have been able to draw this up and have a part printed out in less than a few hours if I was still relying on shapeways. 

[Chris333]

I bet the Photon horns "grew" a little bit as well.

[narrowminded]

If you are trying to get CA thin enough to penetrate you can certainly dilute it with acetone.  You can make it very thin.  The acetone will evaporate and then the CA cures and then... I don't know.   I never tried it.   But I would and maybe I will based on this thread.   I suspect it won't make much of a difference if it even works.

[peteski]

@peteski, yes I know they are fragile.  I am still waiting for a brass example that is even close to this detail.  If you have one, can you show a photo?

John,
You keep touting those bolt heads, but sometimes less is more.  Who (except for super-close macro photography) will even notice those bolts?  I'm all for extreme details and super accuracy, but sometimes trading off super-small details for strength is warranted. Especially on some item which is very delicate, and is mounted in a location which is very prone to damage.

The brass horns probably don't have crisp bolt detail (it's been a while since I examined them under a microscope), but they still look very good.

Here are some examples (no, no bolt details) 

[basementcalling]

Did you try impregnating with anything other than CA?

Where is the Railwire I know. Seriously, @Ed Kapuscinski serves up the ultimate softball, and only @chicken45 even offers so feeble a swing at it as this?

This place is losing its edginess.  We broke the Peteski rule of thread drift within 7 posts too.

Ed, my experiments with saturating some Shapeways castings with CA to strengthen them did not produce desirable results. Still very breakable.

What about using the SW pieces as a master for a mold for brass or even solder castings?

[CNR5529]

I bet the Photon horns "grew" a little bit as well.

Are we taking bets by how much? 

[MK]

If you are trying to get CA thin enough to penetrate you can certainly dilute it with acetone.  You can make it very thin.  The acetone will evaporate and then the CA cures and then... I don't know.   I never tried it.   But I would and maybe I will based on this thread.   I suspect it won't make much of a difference if it even works.

No need to go through all this work.  Just get thin CA, sometimes called CA-.  It's thinner than water.

[peteski]

What about using the SW pieces as a master for a mold for brass or even solder castings?

That might work for investment casting.  It doesn't have to be wax.

Remind me again about my rule of going OT in a thread. Having a Peteski senior moment. 

And yes, TRW has lost its edge - unfortunately. We are all afraid of someone getting offended, or down-votes. 

[Lemosteam]

That might work for investment casting.  It doesn't have to be wax.

Remind me again about my rule of going OT in a thread. Having a Peteski senior moment. 

And yes, TRW has lost its edge - unfortunately. We are all afraid of someone getting offended, or down-votes. 

@peteski Shapeways no longer prints wax models... BOO, but even if they did, the relief details on this model would be out of spec.

Well so far I have not found a way to melt FUD- seriously, but I have not tried to incinerate it.  My 900 degree soldering iron only shatters it. 

A homemade spin casting machine and split silicone mold might work though with a low melt material.

[CNR5529]

So just to close the loop on the Photon horn size after printing, the larger chime was supposed to be 1.33mm in dia, and ended up being 1.39mm. The smallest should have been 0.71mm in dia, and ended up being 0.77mm. That is a 0.06mm difference on the diameter, or just over 0.002". That is an acceptable amount of error for my purposes.

[chicken45]

Where is the Railwire I know. Seriously, @Ed Kapuscinski serves up the ultimate softball, and only @chicken45 even offers so feeble a swing at it as this?

This place is losing its edginess.  We broke the Peteski rule of thread drift within 7 posts too.

Ed, my experiments with saturating some Shapeways castings with CA to strengthen them did not produce desirable results. Still very breakable.

What about using the SW pieces as a master for a mold for brass or even solder castings?

The only "softball" (quantity 1) around here is sitting with Ed on his chair.


HEYOOOOOOO

[daniel_leavitt2000]

On the subject of CA. While it may not be strong on its own, impregnating with a porous material would strengthen both the material and the CA itself. This is the whole idea behind carbon fiber and fiberglass.

[MK]

Mixing loose porous material into CA won't add strength at all.  It's the structural integrity of the carbon fiber or fiberglass that provides the strength.  Adding CA to those materials strengthen them.  But adding "stuff" to CA won't.

Maybe I'm misinterpreting your statement.