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?
@Engineersoldinterstingstuff7 ай бұрын
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.
@marcn87507 ай бұрын
Super. Thanks
@moulichandumouli1379 ай бұрын
Bro good work.. I have some queries for which materials, we have to use diamond polishing & alumina polishing.. pls explain
@NavratanPanwarMMT Жыл бұрын
Thank you so much man for wonderful explanation !
@NavratanPanwarMMT Жыл бұрын
Thank you so much man
@joehalliday6081 Жыл бұрын
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.
@user-oj5jz7dl7u Жыл бұрын
Can you please add the spread sheet, how can I download it?
@leizhao2122 Жыл бұрын
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.
@djsalvi26 Жыл бұрын
I prefer to use this vibro polisher, yiu don‘t need to glue the polishing pad on the working disc, amaizing machine: kzbin.info/www/bejne/nJbWp6OYirWde80
@gabrielpagan5713 Жыл бұрын
great videos!
@williamhuang5329 Жыл бұрын
Hanzhen harmonic drive gear , strain wave reducer ,robot joint , over 30 years experience
@williamhuang5329 Жыл бұрын
Hanzhen harmonic drive gear , strain wave reducer ,robot joint , over 30 years experience
@adityanurardy6220 Жыл бұрын
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
@gammmo87402 жыл бұрын
Is it possible to get the spreedsheet? It is not anymore in the drive. Thanks a lot in advance!
@dilankadeegala63062 жыл бұрын
These videos were very informative and they help me a lot. Thank you very much !!!
@artemdubrovski44542 жыл бұрын
amazing info. hello from slm 3d printing jobshop✌🏻
@bhukya182 жыл бұрын
WHY NOT YOU CLEAN WITH ETHANOL AND DRY IT AFTER THAT.
@syafinazmajuar19932 жыл бұрын
what will happen if the grinding and polishing steps are not followed or ignored?
@gabrielpagan57132 жыл бұрын
then the specimen will be useless. Grinding and polishing ensures a smooth and deformatin-free specimen, free of scratches, etc. If you do not grind and polish you will not get accurate hardness readings (if doing micro hardness testing) and false microstructures if trying to interpret microstructures.
@irfankhann96032 жыл бұрын
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....
@CGSW3 жыл бұрын
You need to learn how to use those calipers. Don't use the tips, use the jaws closest to the frame for starters.
@moatazabdelrahman56913 жыл бұрын
Great tutorial it's really helpful and very detailed, can I ask you where you get the silicon carbide sanding discs in the US??
@CharlieSanabria3 жыл бұрын
I've used Extec, Struers, and Buehler in the past. They are all good
@moatazabdelrahman56913 жыл бұрын
@@CharlieSanabria Ok great, thank you so much.
@jacobsenske4 жыл бұрын
KZbin has spoiled us... A little video editing goes a long way.
@maheraljubari75584 жыл бұрын
Who here attends delta?
@PsychedelicLullaby4 жыл бұрын
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
@CharlieSanabria4 жыл бұрын
Etching always brings out all kinds of nasty stuff. I've never seen a clean sample after chemical etching. Other sources of dirt particles are bubbles in the epoxy. Try vacuum impregnating to reduce the bubbles. Using an ultrasonic bath between polishing steps also helps.
@FrostFire6265 жыл бұрын
I'm starting a microscopy program at my cement plant and this series was exceptionally informative, thank you.
@michellep42195 жыл бұрын
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?
@CharlieSanabria5 жыл бұрын
No reason, in fact I had some trouble getting them out. I should have, ha! And yes, sputtering is the best way to reduce charging. I used carbon.
@paulblasingame5 жыл бұрын
does anyone do it by hand anymore?
@tcurtis43605 жыл бұрын
both
@paulblasingame5 жыл бұрын
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
@djsalvi266 жыл бұрын
For what you need this coating on your sample?
@CharlieSanabria6 жыл бұрын
djsalvi26 SEM requiers your sample to be electrically conductive. Since epoxy is not, then coating it with carbon or metal helps
@matanhuseynli10266 жыл бұрын
Thank youu.
@bludog46576 жыл бұрын
Thank you Charlie!! Going for my first interview for a material scientist. Peace!!
@bludog46576 жыл бұрын
One of the best instructions on this type of skill I have ever seen!!
@bludog46576 жыл бұрын
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
@djsalvi266 жыл бұрын
It is always a pleasure to watch your clips, you are the only one which explain the samples preparation in detail!
@zms96036 жыл бұрын
How the bubbles influence the polishing process? will it cause scratches?
@CharlieSanabria6 жыл бұрын
No, they just sometimes shorten the life of the pads because they rip easier if the bubble catches a sharp edge of a puck
@Thegeneralduct3 жыл бұрын
It also creates an uneven surface so the patent is essentially uneven at that point
@muhammadazhariqbal53046 жыл бұрын
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 ?
@CharlieSanabria6 жыл бұрын
Can you use methanol? There are alumina suspensions that are methanol or ethanol based
@muhammadazhariqbal53046 жыл бұрын
Thanks for reply i appreciate your videos are great help I only have acetone and Ethanol " I have to use it in the same quantity as water in your videos) If used water what possible adversity i can have ( my sample is Iso-molded Graphite coated with Molybdenum )
@hiredgoon136 жыл бұрын
sic for 45sec pad 180- 2000 grit, finish on silk (DAC) or a floc with ops silica
@hiredgoon136 жыл бұрын
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
@tepdotv23497 жыл бұрын
I'm Suwit from Thailand , I want contact to you about advice for preparation sample , My Email [email protected] thank you