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Found 10 results

  1. Shaun-DFW Fossils

    First “prepped” echinoids

    I am new (12-14 months) to hunting for fossils and even newer to trying my hand at prep work. I have zero tools and I’ve mostly dabbled with a few air scribes doing volunteer work cleaning dino bones at southwestern Adventist university, who has a massive collection. But my friend let me practice with his air abrasive tool, which I had not used before. I was pretty happy to get these three hemiaster whitei echinoids prepped after finding them in Fort Worth. He advised me to hold the tool at least an inch away and do slow horizontal back and forth motions to blast away the tiny particles of matrix (and a few larger chunks) I had to free up. I managed to not chip any of them, thankfully! I will be trying my hand at some larger macrasters next. One of them still needs just a little work near the bottom.
  2. I have been using dremels (290 and 7760) and hand tools for the most part so far, but I am looking to expand the range of tools I could use. Specifically, I would to start sandblasting and using air scribes. Thus I would be grateful if you could provide any information regarding all the necessary kit I would need (compressors, tubing etc) and where I can get these pieces for the best value for money. Thank you, HelicoprionChristian
  3. I had an issue with my Paasche AECR remote canister where the flow of abrasive (bicarb) was very inconsistent. I had to shake the canister manually every minute or so, and the flow was much more abrasive right after I shook the van because more bicarb was floating in the air, decreasing abrasive ness until I would have to shake it again a minute later. This led to very inconsistent prep results. I decided I needed to take some sort of vibrating device and attach it to the canister containing the abrasive so that it would constantly shake bicarb into the air to be run through the air abrasive system. I settled on an old vibrating head scratcher. I removed the wiring from the device. I built a small wooden box to house it to dampen the vibrations so that the whole prep station would not vibrate, just the canister. I put a towel in the box to further dampen the vibrations. It worked like a charm! The system now runs with a consistent flow of abrasive when I turn the head scratcher on, and I never have to shake the canister manually. I cannot feel the vibrations from the device at all because the towel and box keep them contained. Below are photos of the whole process.
  4. Hello all, (I do hope I've gotten this in the correct category) I'm considering trying to invest in an air abrasive setup for fossil prep. Mainly looking to find something that will be capable of some light matrix removal in tight spaces. I already have a functional air compressor and I find these kits online for cheap. My questions are simply, are these cheap pens functional for prep? And will the aluminum oxide they come with be safe for fossils? Thanks for all of your help and guidance!
  5. Greetings! I've been gone from the forum for a while because personal circumstance prevented me from prepping and showing off my finds, but due to a friend retiring and selling off his old setup to me I am now soon to be prepping again! My problem is with this Comco unit I got, I know water in the air line will put these temporarily out of commission in a heartbeat, so what all do I need to do to keep water from clumping my abrasive? I know some very basics, that I need an air drier and to keep the media dry, but what brands of air dryer work best for our preparators on the forum? How do store your media? Is there anything outside of these variables I'm missing? I'm going out tomorrow to look at supplies, so any recommendations would be appreciated.
  6. I know I will regret posting this, especially after reading about @Fossil-Hound‘s 60-gallon behemoth, but has anyone tried Harbor Freight’s new ultra-quiet Fortress air compressor? I would only be using it for air abrasive work (probably with a Paasche AECR or similar), not air scribes, so I don’t need gigantic capacity. (Sidebar: I know I would not have the ability to ever use it with scribes in the future, no need to lecture me about that.) Green River fish and Wheeler Range trilobites are the kinds of things I would use it for. I have already built my blast cabinet. I don’t have a lot of room and I really like the idea of it being quiet. The reviews I have read so far make it sound much better than other brands but I’d like feedback from someone who has really used it if possible. Here’s a link to the one I’m looking at: https://www.harborfreight.com/2-gallon-12-hp-135-psi-ultra-quiet-oil-free-professional-air-compressor-64596.html
  7. DevonianDigger

    S. S. White 6500 Rebuild

    I figured this might be a good thread in case it comes up for anyone else in the future. I recently purchased a used S. S. White 6500 model micro sandblaster unit for my workshop, which from here on out, I will likely refer to as a lab, as it now contains a higher dollar value of equipment than my media production office. Upon arrival, I discovered that it was not only pretty well used, but very poorly maintained, and was in fact, not functional. Since I got it for an absolute steal on the auction site, it's still worth every penny. After disassembling the unit, which I didn't have the foresight to photograph, I was fortunate enough to get on the phone with Joel, the president of Airbrasives, the subsidiary of S. S. White that manufactures these units. Joel was extremely nice, very talkative, and exceptionally helpful. We spent more than 90 minutes on the phone discussing the specific model, the parts that tend to wear out first, and what to look out for in terms of repairs and potential future pitfalls of maintenance. I figured that since I have had this experience and will be rebuilding this seized unit over the next few months, it might be a good project to share in case anyone else is able to get a similar bargain.
  8. Hi all, I have been searching through posts in the forum about various types of abrasives, and I can't seem to find a comment anywhere where someone breaks down the pros/cons of the different forms of abrasive and their microns. Of course I realize everyone has their own preferences, I am just confused as to the objective benefits of what looks like the three main types of abrasives: dolomite, aluminum oxide, and just plain baking soda (besides the fact that baking soda is more delicate.) The Paasche Air Eraser comes with 240 micron aluminum oxide, but that seems to be a little extreme for fossil preparation, is there an appropriate time and place in which I could use that? What would be the max (or even a general range) micron of either dolomite or aluminum oxide that one would recommend I use for 1. Green River fish, 2. trilobites, 3. ammonites, or 4. just general fossil clean-up?
  9. Hello everyone! So i have been hard at work. Last time I damaged a couple of fossils because the PSI on the sandblasting machine was too high while I was working on removing matrix directly off the fossil. This time I learned that higher pressures like 20 or 40 PSI can be useful for removing large amounts of matrix that are not directly touching the fossil. While lower pressures like 5 PSI are useful for removing small amounts of matrix to expose details of fossils. Also it is a good idea to wait to expose details until the entire fossil is mostly exposed and only detail work remains. This is because the more a fossil is exposed and being worked on the higher chances are that details will be erased by the air abrasive moving over the fossil. Even in areas you are not directly working on. Please watch my video and learn more about it! Special thanks to the University of Utah for letting me use their lab, and a special thanks to the University of Utah Undergraduate Research Opportunity Program for helping too!
  10. Zachster

    Getting Started

    Hey guys! So I thought that I would start a new blog here. I have been looking for videos and other instructional material on line for how to prep / clean a fossil and have not found much. Google did not seem to be to helpful in this matter. I did find a few more things on this forum and they were very helpful. I learned what materials I needed and some techniques of how to clean fossils, but nothing like "Make sure to do this.....", "don't do this....". So I was able to gain access to my School's Palio and geoscience lab, and we put together a fossil prep lab. Now it may not be as fancy as a museum but it works!! And I am excited to work there! I may also be able to go to a nearby museum and be trained in how to do this as well. We will see. So I have some trilobites from the wheeler shale formation, in Dugway Utah, that I will be practicing on. The point of this is to get my skills high enough to be able to work on other fossils with out damaging them, for a research project I am involved in. In the video I show you what I do and talk about why and also talk about what I do wrong and how I fixed them. Please feel free to talk about this and to give advice. Here is a video of what I have been able to do so far. I started a youtube channel so that everyone can see what I am doing. So far I found that if i put a circled groove around the fossil, hopefully deep enough, that when I break the parallel layers of shale below the fossil that it will let the fossil be removed, with some matrix, from the rock. I will then later remove the excess rock off the fossil with an air abrasive / sandblasting machine. After I put the circled groove around my trilobite fossil I put my finger on it so that way it does not fly away when I use the air pen to pop it out. I had some success with this. I also found that keeping the PSI on the sand blasting machine around 5 PSI was necessary. Anything higher then that and I was damaging the fossils I found this out the hard way. I damaged two fossil because I did not check the PSI on the machine before I started. Fortunately they are ones that I own and not some one else. Best check that PSI next time!! Well enjoy my video! and remember please share this with others who are interested in getting started. And feel free to give any advice I would need for a beginner! Zach
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