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Found 10 results

  1. Lmshoemaker

    Help with green river fish.

    Hello! When I bought my air abrasive a year ago the guy that I bought it from gave me a bunch of unprepped green river fish as he was retiring. One issue that seems to commonly come up is that no matter how low I set my psi or how slow I go on some fish the "skin" seems to pit and develop holes. Is there any way to avoid this? I've gone down to as low as 1-3psi with dolomite and this still happens. I've noticed that it tends to happen on disarticulated specimens mostly, and part of me feels this is more of a preservation issue than anything. The guy I got my abrasive from also included paint I
  2. Thomas.Dodson

    DIY Dust Collection System

    I've received a couple requests for more information/instructions on how my DIY dust collection system works so I decided to write this guide. First, a crude diagram to help understand how it works. The idea is for water to act as a filter before dust even gets to the shop vac filter. It keeps the filter almost entirely clean and prevents dust from prematurely killing the motor. It's also a lot easier to clean up as you just dump the dirty water. The setup is simple and as long as the general process goes like this it is fine but I'll walk through how I built my current system. I u
  3. hadrosauridae

    Stages of fossil prep

    I love the process of discovery, removal and cleaning of fossils. I enjoy just looking through my picture of them as they see daylight for the first time. So, in that thought (and since I'm stuck at work and cant be in my prep lab) I thought I would share the piece I have been working on lately. This is a rib head of Edmontosaurus as uncovered and before removal. Hell Creek fm, Butte Co, South Dakota. Below on the right you can see a main rib section just started to be uncovered. The main section was actually found first, and then the rib head was found as I began removing the
  4. Malcolmt

    Interesting Bug # 1

    Let's go on what may turn out to be an extended journey. It is my intention to try to take pictures ever few hours along the way while prepping this little guy. In a few minutes I will post a picture of an unprepared trilobite exactly as found with no preparation whatsoever. What is a bit exciting about this one is that it is actually my bug and eventually when finished I will actually get to keep it for my own collection. Unfortunately for me, most of the really nice bugs and crinoids I prep end up not being mine, but at least I get the chance to experience them and see them come alive in per
  5. Cowboy Paleontologist

    How to choose abrasive media?

    Hello! I have recently acquired an air eraser to prep fossils out with, and I was just wondering how to choose an appropriate abrasive for the task. I have a few different items I would like to prep out, but most specifically are some horn corals and hexagonaria from the Devonian Coralville formation.
  6. I bought a non-working Comco MB-101 air abrasion unit. I've got everything working but have a question about the foot pedal or the lack of one. The unit did not have a power cord or foot pedal when I bought it. I contacted Comco they no longer have a parts list or manual. I would like to know the manufacture name and model of the foot pedal if anyone has one to reduce my chances of picking the wrong one. I'm currently using a toggle switch. Thanks, Hoffy
  7. Hello all. I recently picked up this Airbraisive which has a quite large "industrial" nozzle that's orifice is WAY to large for me ! I'm using 44u CrystalMark dolomite as well as some CrystalMark soda. Any thoughts on upgrading the handpiece and or just nozzles. Sizes, etc.? Thanks in advance.
  8. Max fragmento

    Air abrasion info?

    Hello I am really struggling to figure out the best way to do micro abrasion. All of the units I can find on line all have terrible reviews regarding quality and functionality. Many of them are dental oriented units, which would probably be fine, but they are chinese made and poor quality. Then it seems that without expensive and elaborate water removal systems for your air compressor they wont work anyway. There are obviously zillions of people out there around the world prepping fossils using micro-abrasion and hopefully baking soda but I cant seem to find a system that anyone li
  9. trialsin808

    Air Abrasives

    Hello, can anyone tell me what the difference in performance is between a non pressurised and a pressurised micro air abrasive unit please? Also, some of the more expensive micro blasters can run at 185 psi so how powerful a compressor would be needed? I mean most workshop tanks wont hold this pressure for long surely?
  10. Well I finally managed to acquire 5 kilograms of aluminum tri hydrate Al(OH)3 with 100% guaranteed to be smaller than 200 mesh and 90% guaranteed to pass through a 300 mesh screen. The tests I ran were as is; unscreened out of the bag. The tests were using a COMCO air abrasion unit at varying presures from 2 PSI to 90 PSI. I paid $35 for 5 kilograms (about 11 pounds). The material seems to be very consistant in size definately under 50 microns. A small particle size is good for delicate prep work. The data sheet that came with the product rates it as non hazardous which is a very good thing ,
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