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Old 26th October 2011, 05:57 AM   #1
jrobson is offline jrobson  South Africa
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Default Build coming together nicely

Just thought I'd post some pictures of my development since the forum is a little quiet. I still have to do a bit of work of course but so far it's working out okay.

With the almost all motor-run cap setup the amp has to be reasonably huge, it's okay though it is balanced well with huge OPT's.

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Now for some help please
I got a little bit of "water" on it accidentally which is not just water it has a cutting oil emulsifier mixed in, since I usually machine metal the default on the code output is to switch the water on, once of twice it got away from me (usually happens when you get tired at the end of the day), I'm curious if anyone has any ideas how to draw the oiliness out of the wood, it's not very deep, I stopped it quick and wiped it off, but there are some marks as you can see at the front. I would like to dye it instead of painting it but I would need to then draw the oil out first?

Regards,
Jonathan.
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Old 26th October 2011, 11:51 AM   #2
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Amazing work! I don't think I've seen a milled wood amp chassis before. As for the oil marks on the wood, I'd start by getting a scrap block of the same material. Splash a little of your oil/water mix on the scrap, and practice first on the scrap piece.

I might be inclined to try an oil based stain on the whole thing, in the hopes the stain somewhat blends the blemish. I don't know how you would otherwise draw it out completely.
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Old 26th October 2011, 12:35 PM   #3
jrobson is offline jrobson  South Africa
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You can see it on the front, it isn't bad actually, and I want to stain it black anyway, I just don't want the oil to cause problems. I did some reading on the problem and a lot of people recommend thinners with an absorbing agent, I'll give that a go and see how much I can get out, I might just be able to sand it out though, I haven't tried yet so not sure how deep it is.

It is stupid big to be honest but it worked "ok" in the end, luckily I had the super long tool bits, I think the reason you don't see something like this is most likely cost, paying someone to machine something similar would probably set you back $1500-$2000.
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Old 27th October 2011, 10:38 PM   #4
Ian444 is offline Ian444  Australia
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Looks fantastic, should sound really good too.
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Old 27th October 2011, 11:14 PM   #5
yoaudio is offline yoaudio  United States
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Use clay "kitty litter", works great for drawing oil off the driveway.
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Old 27th October 2011, 11:49 PM   #6
evanc is offline evanc  United States
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That is too cool......

Try Naptha to get out the oil. What are you going to use for dye? If it's alcohol based dye I don't think a little oil would be a problem. Water based might not be the best choice in this case.
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Old 1st November 2011, 05:59 AM   #7
jrobson is offline jrobson  South Africa
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Thanks for the advice, I wanted to mix it with a shellac solution
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Old 9th November 2011, 07:43 PM   #8
Alco is offline Alco  United States
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The shellac sounds like a good approach. It'll cover just about anything and has at least a mild tolerance to heat. And you can control the color, too.

I've made my own shellac from crystals and denatured alcohol with great success.

Super cool work on the chassis !

Last edited by Alco; 9th November 2011 at 07:52 PM.
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Old 9th November 2011, 07:55 PM   #9
jrobson is offline jrobson  South Africa
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Thanks, I bought it ready mixed, just received it today I was not going to use Shellac anymore thought of having it painted until your post, I was worried that it would be too difficult to apply, but thanks to your post I'll give it a shot for sure, will get working on it hopefully done in two weeks
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Old 9th November 2011, 08:07 PM   #10
Alco is offline Alco  United States
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Just a wee bit of warning about the pre-mixed shellac:
I've not used it, I have always mixed my own, but I have heard from others that it can take a very long time to dry and in some cases always remains a tiny bit tacky.

I use shellac on the guitars I build and the info on the pre-mixed stuff comes from other guitar makers.

When I mentioned controling the color I meant that you can choose shellac crystals of different colors. It's really neat stuff.

Good luck, whichever route you choose.
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