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Спасибо!

Hi, informative video, I have a question though: How to break a small sample out of a resin? if you have to perform hardness and you don't want the resin to effect the measurements, how shall I proceed to take out a sample from resin?

I do the opposite, grind on papers down to 2500-4000 range. Get much better edge retainment that way. Especially important for cast irons where soft cloths tend to erode the graphite. Generally its much faster to go on carbide papers and finnishing of by diamond. My way in general, 400, 800, 1500, 2500/4000 then 3 and 1 micron diamond suspension.

Super. Thanks

Bro good work.. I have some queries for which materials, we have to use diamond polishing & alumina polishing.. pls explain

Thank you so much man for wonderful explanation !

Thank you so much man

Would you consider doing a custom episode related to a metalurgist that many suspect was the 1971 plane hijacker from Seattle to Portland that was never found? The FBI searched for 46 years and finally closed the case. The hijcker left behind a tie, presumably used in his metalurgy lab, and examination of it revealed dozens of rare metals, titanium alloyed to Antimony, titanium alloyed to aluminum, yttrium, palladium, lanthanum, and many many others. Your expertise would be very interesting to explore and perhaps you could recreate some of the methods used in the late 60s' and early 70's that could tell us more about the suspects. The two suspect metalurgists currently being investigated hold many patents that tell us a lot about their work and the metals they used. One of the metalurgists worked with plutunium/uranium to build the fat man bomb that was detontated over Japan to help end WWII in the pacific theater. The DB Cooper Mystery Group on Facebook has thousands of members and if you posted your interview there it could expand the interest in Metallography. Let me know what you think.

Can you please add the spread sheet, how can I download it?

Just out of my curiosity, why would you want to polish your sample parts with some days of interval? Great video, thanks for the sharing.

I prefer to use this vibro polisher, yiu don‘t need to glue the polishing pad on the working disc, amaizing machine: th-cam.com/video/fesvpbUPjEk/w-d-xo.html

great videos!

Hanzhen harmonic drive gear , strain wave reducer ,robot joint , over 30 years experience

Hanzhen harmonic drive gear , strain wave reducer ,robot joint , over 30 years experience

how many paper reused before you change to new paper? or you use once? standard at my lab is the coarse grit use 120 and finest 2000, but the supplier company often out of stock and only supply up to 1200. is that fine? do your disc holder has loose fit to mounting? my disc holder has gap 0.5mm and 5mm thick so sample wobbling when machine running resulting curve face. that annoying when using microscope escpecially when observe chrome thickness at the edge. sorry for my bad english

Is it possible to get the spreedsheet? It is not anymore in the drive. Thanks a lot in advance!

These videos were very informative and they help me a lot. Thank you very much !!!

amazing info. hello from slm 3d printing jobshop✌🏻

WHY NOT YOU CLEAN WITH ETHANOL AND DRY IT AFTER THAT.

what will happen if the grinding and polishing steps are not followed or ignored?

hello sir...what kind of chemical should we use after grand sample....to take a clear image....i am working on laser cladding coating on cupper using Cr3C2-NiCr powder....

You need to learn how to use those calipers. Don't use the tips, use the jaws closest to the frame for starters.

Great tutorial it's really helpful and very detailed, can I ask you where you get the silicon carbide sanding discs in the US??

TH-cam has spoiled us... A little video editing goes a long way.

Who here attends delta?

thank you for your great video series. I have some questions for you. I would be very happy if you can help me: I am working with deep drawing steel (low carbon) and i use rotary polishing disc. After i finish grinding at 2500 grid sand paper, i use 1 micrometer alumina suspension and 0.5 micrometer colloidal silica. It is very hard to clear my specimen after the final polishing step. I tried your cleaning method and they are far better now. But some of my specimen are still cant be cleaned that good and sometimes i see some scratches (not so deep) after etching with %2 nital. What do you suggest me to do about it? Some of my specimen are very hard to clean. I suspect it caused by my cold mounting material. what do you suggest me to use? If you can share your e-mail adress with me i can send you their photos. Thank you

I'm starting a microscopy program at my cement plant and this series was exceptionally informative, thank you.

Is there a reason you didn't use non-stick spray on the sample holder prior to pouring the resin? Also, for the epoxy non conducting for the SEM - can you not sputter gold to reduce the charging?

does anyone do it by hand anymore?

nice. i do all mine on rotating silicon carbide wheels by hand. then to .05 micron alumina. would like some nice machines like that to help me out tho. lol

For what you need this coating on your sample?

Thank youu.

Thank you Charlie!! Going for my first interview for a material scientist. Peace!!

One of the best instructions on this type of skill I have ever seen!!

Thank you Charlie for these videos. I am trying to get into this type of work, your clear and precise explanations have helped familiarize the work. Happy 2018

It is always a pleasure to watch your clips, you are the only one which explain the samples preparation in detail!

How the bubbles influence the polishing process? will it cause scratches?

I have Graphite substrate coated with half micron Mo. I want cross sectional SEM examination . I will appreciate if you please suggest what solvent i should use? water will affect by sample ?

sic for 45sec pad 180- 2000 grit, finish on silk (DAC) or a floc with ops silica

extec, I always get terrible results with extec, almost no diamond concentration and very rounded regardless or poly or mono. lower concentration than buelher and stureurs

I'm Suwit from Thailand , I want contact to you about advice for preparation sample , My Email Tepdoraemon007@gmail.com thank you