Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Apr 19, 2012 23:08:18 GMT -5
Just used Testors enamel because I knew it was enamel from doing models as a kid and it has to be enamel as it gets really hard (as paint goes). Modern paint is too flexible. 170 deg C / 15 min
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Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Apr 19, 2012 23:01:19 GMT -5
I have 3 more on the go so that means at my painting rate they will be ready to cab in a week or two. I have been cooking them at 170 deg C (338 deg F) for about 15 minutes a layer. If your going to try it you will need a small well insulated oven or really deep pockets. Obviously I have the small oven or I could just buy some fordite. This is actually my third try, just first try with this method. First try was no baking, that is a disaster it gets bubbly and never hardens properly. The second try was paint only baked. I didn't think I would live long enough to finish that so that's when I added in the 1/8" metal. Anything that can take the temperature would work though. This really makes you realize just how many cars had to be painted to get a piece of fordite.
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Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Apr 19, 2012 17:59:16 GMT -5
I just finished my first home made fordite/detroit agate cab. I made it by using a 1/8" thick piece of stainless steel (I thought that would save a lot of time painting.) that I built up layers of testors enamel model paint on. I baked it in a oven on each layer. When I thought it was thick enough I cabbed it normally. Its not really rounded over enough really but the paint isn't thick enough for more curve. I have 3 more to the same paint thickness that I will keep on building up. Thicker should result in more and smaller banding. Its a little too much on primary colors (I bought the cheapest paint set in case it didn't work) and I don't think I like the silver paint (no more layers of that) but not bad for a first attempt. If you try this though keep in mind it takes a whole lot of paint layers even with the stainless. I probably have 100 layers on this, it takes a really long time.
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Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Apr 4, 2012 0:35:51 GMT -5
Don, I agree completely that abrasive grit would be too agressive but if you do a search on google for "air eraser soda" www.google.ca/search?q=air+eraser+sodayou will find quite a few people using soda in them. It does sound like there is a couple issues but here is a video of someone using one with soda, in the video he tells how he modified the harbour freight one to make it work better with household soda. I had read in other spots that you should not use hosehold soda for blasting because its too fine so clogs, so it might be better with proper blasting soda. or if you just want to see what soda does before you buy anything check this out.
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Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Apr 3, 2012 0:59:01 GMT -5
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Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Apr 2, 2012 23:54:22 GMT -5
Well that explains why I couldn't find anything on auto body paint, might have to try the artist paint like Jo said.
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Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Apr 2, 2012 1:28:57 GMT -5
Just wondering if anyone has ever gone to a local autobody shop to see if you could get something fordite like? Maybe they don't get buildup like that, but just curious.
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Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Mar 19, 2012 18:48:01 GMT -5
Here are some pics of the porcelainite I got as requested, I gave most of the other stuff to Brent as I already had a bunch. Some nice chunks The haul
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Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Mar 18, 2012 23:52:10 GMT -5
We got quite a bit of nice porcelainite, some jasper and agates. I'll have to post some pics
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Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Mar 18, 2012 21:57:22 GMT -5
Brent came down today for some rock collecting. We found quite a bit of nice stuff and anytime you can go collecting in Saskatchewan in March its a great day. He brought me this blue halite crystal from the potash mine he works at. It is awesome.
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Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Mar 17, 2012 10:42:04 GMT -5
That turned out great Larry. I'm sure your mom loves it. Super shine on the cab too.
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Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Mar 12, 2012 23:19:17 GMT -5
hmmm, probably a good point with the safety. Probably a lot easier to slice off a finger than a rock........... Not much fun unless its hands on though. That might be the point that kills it for me. Always someone who has to go and ruin a bad idea.
And I do not have cabin fever, your just all out to get me and my rocks!!!! What was I talking about? I should go outside probably.
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Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Mar 12, 2012 1:47:06 GMT -5
I guess I should have stated my question more clearly at the beginning. My bad. This just seems to be confusing quite a few people. Everyone stop wondering if it has enough pressure and yes I'm planning on using abrasive. A cutter at the pressure from a pressure washer is absolutely possible. Here is a link to a low pressure (5000psi) rock cutter developed for use at Gateway Arch in St. Louis. tinyurl.com/7vuwgp5If you reduce the orifice size of the nozzle you will increase the water exit velocity. Just like putting your thumb down on a garden hose. It is the speed of the water/abrasive that does the cutting not the pressure. The pressure just allows you to have a larger stream for the same velocity. The pressure is all lost the second the water exits the nozzle. Google bernoulli's equations if you doubt me on that. The real question that needs to be answered is if we have a small enough orifice to get enough water/abrasive velocity at the relatively low pressure and more importantly low volume that a pressure washer can put out can we get grit to go through a small enough nozzle or will it simply plug up? Sure I could calculate it out but how much fun would that be? At gateway arch they had a pump that put out 160L/min at 5000 lbs but they were also trying to make a much larger cut than we would be interested in. For our best neatest cutting we would want an orifice only slightly larger than the grit. This however might very well be too large for a pressure washer to supply the needed velocity required.
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Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Mar 11, 2012 12:50:30 GMT -5
Neat! I like it.
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Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Mar 11, 2012 12:45:31 GMT -5
Were you adding grit somehow Jason or just using the washer only?
I was actually thinking more along the lines of something hand held. maybe could use it for carving?
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Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Mar 10, 2012 0:36:40 GMT -5
Looks like we have a volenteer!! I just wanna know if it will do anything. Stick a nozzle in it and tell us what happens Tony.
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Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Mar 9, 2012 0:22:47 GMT -5
Well that says pressure would be a issue. Pressure washers only run about 3000lbs. Never did think plain water though hence the blaster. Pretty obvious you need more than just water unless you have a lot of time to wait. I would still be curious to see if you could get any reasonable amount of cutting from it. Even a drip given enough time will erode stone. Might still be able to use it like a trim saw on slabs or you might just get really old waiting.
Somebody out there must own a pressure washer already, the blaster nozzle is only about $20
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Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Mar 8, 2012 19:42:33 GMT -5
Geoff I'm thinking the grit should be able to get sucked in with the venturi just like in a blaster. I probably won't build one because I don't have or need a pressure washer. It was just an idea I was throwing out there. Maybe someone who already has one can put one together. The blaster nozzle is cheap.
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Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Mar 8, 2012 19:35:15 GMT -5
rockjunquie the groove is cut with a grinder like this using a bit like this Thanks everyone.
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Saskrock
fully equipped rock polisher
Member since October 2007
Posts: 1,852
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Post by Saskrock on Mar 8, 2012 1:23:48 GMT -5
From the maker of a working toilet bowl plunger vibe tumbler comes this new idea. If I took a modified sandblaster nozzle or made something similar and combined it with a pressure washer could I make a water jet ? I'm thinking I might have to adjust nozzle and venturi sizes but it just might work.
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