I have a drawing calling out RMS. My mitutoyo profilometer doesnβt have RMS values but does have an RQ page. I googleβd both and it seems theyβre used interchangeably? Just want to confirm.
Hi everybody! Sorry if I used the wrong flair, I'm not sure under which branch of engineering my question falls.I'm a bioanthropology grad student and I'm studying the effects of wind abrasion on bones to see if it can produce traces and/or polishes that could be confused with man-made tools. One of the ways I am planning to use to quantify the abrasion is by comparing the surface roughness of bones exposed to different wind speeds and durations to actual bone tools. I will be using an Olympus DSX-100 opto-digital to do so. I have a background in biology and anthropology, so I'm not very familiar with material science or the concept of surface roughness. I understand the basics but I would greatly appreciate if any of you had introductory sources of sources that do a good overview if the subject (ex: text book chapter) . Anything on the different ways of measuring it and the theoretical background would be super helpful. Also if any of you had any experience measuring surface roughness with a microscope I would love to hear any tips you have for me. Feel free ta ask me for more info about what I'm doing as well .
Thanks for you help!!
Edit: I also am a bit confused about the standardization of surface roughness. My microscope offers me the option to use Ra(ISO4287) but I not really sure how it is different for other types of surface roughness.
Whats up!
Currently doing a thesis for a superyacht solutions company.
How do i find out what surface roughnesses are created with electropolishing compared to polishing by hand? Currently all stainless steel parts are polished to a #8 mirror finish by hand. i understand this is impossible with electropolishing, but i was wondering how close we can come to a mirror polish using electropolishing.
It's hard to find Ra calculations or micrometer values about different types of polished surfaces but i need it to make a comparison. I found some data on scientific papers but it's not straight forward and practically unusable
Hello, r/shodo! I'm taking a Japanese Calligraphy course, and I'm very excited. I had my first session today, and when I was grinding the ink, there was some resistance at first, but later, it felt entirely smooth. Is this normal? I couldn't tell if ink was being produced or not. I want to make sure I am grinding the ink correctly and that dark, saturated ink is actually being produced.
When I was looking for ink stones, I saw something about having to "degrease" them to remove the smooth coating. Is this something I should do?
Thank you!
Wikipedia tells me surface roughness is the deviation of the normal vector of the real surface from the ideal surface. For the non-STEM people, this basically means you have an imaginary line sticking 90 degrees out of the real surface and see how that line changes from a different, also imaginary vertical line.
But letβs pretend we use the cross section profile of a finned heat sink as our surface. If we plot the deviation against x-distance, we see basically a square wave. If we scale down the heat sink fins to a thousandth of an inch tall and plot the same parameters, weβd get an identical graph because the deviation of the normal is the same. Obviously the βroughnessβ of a heat sink profile is not the same as that of this shrunken down...thing, but the plots are the same. What am I not understanding about roughness?
I am looking for an existing tool that takes data from laser road scans in OpenCRG format as an input (stored in Matlab files) and provides the International Roughness Index for the data in the file. I have no experience in this area. Does this tool exist? Better yet, is it open source/free? I am trying to avoid writing something from the ground up using the IRI standard. This must be something people do frequently, no?
If the software is not free, that is OK too.
Also, is there a better subreddit to ask?
Thanks!
This has been driving me crazy lately. I have been getting rough outer walls on curved edges only, and not on everything. Pictured here is the tube and nosecone of a model rocket I printed separately. The tube came out flawlessly, the layers can barely be felt by hand. However, the nosecone is extremely rough. I enabled coasting, tightened the wheels on my rails, everything.
I am using an Ender 5 Plus, with a BIGTREETECH SKR V1.4 Turbo 32bit Controller, Capricorn tube, dual gear extruder. I have calibrated the esteps on the extruder to +/- 1mm on 100mm, leveled the bed to within 0.05 and I only see this issue occasionally. I think it might have to do with extrusion or flow.
I'm thinking because a highly rough surface will technically have more surface area. I imagine this will only apply to the initial layer but that would still be of interest to me. If anyone has any links to any articles it would be greatly appreciated :)
Hi all,
Iβve been working on a product and am ready to move to initial prototype runs with a local manufacturer (woohoo!).
Iβm trying to spec the surface finish for an injection molding tool for the silicone component of the produce but havenβt been able to get a clear answer on the feel of different surface finishes, particularly when done in soft silicone (20a).
Iβve been told using a highly finished mould (Ra 0.1um) could result in the product feeling sticky to the touch - is this true? would this apply to an βas machinedβ finish? Iβm after a matte finish than is soft to touch - any tips, learning resources or examples would be much appreciated.
TL;DR - need to spec Ra value for a soft to touch but not sticky silicone product
Hi, I would like to ask is there any simulation software that able to measure or to study the workpiece's surface roughness/straightness of an object after a milling operation? I used ABAQUS to simulate a CNC cutting process. But my final outcome is to study the surface outcome of the workpiece such as surface roughness/straightness. I wonder is there any software that can do that.
I have been taught at school that surface roughness is one of the factor affecting frictional force. Until just now I read at Physic Hypertextbook where it said friction does not depends on roughness. Basically it does not classify the abrasion and normal force between ledges as friction. (https://physics.info/friction/summary.shtml) Screenshot: https://ibb.co/3SNdpjL
So I went to wikipedia and it listed that roughness is one of the factor. Screenshot: https://ibb.co/fHfkSJL
Now I confused. Is surface roughness a factor affecting friction?
Hello! I have some zirconium samples that need to be analyzed for surface roughness. Can surface roughness be accurately characterized using an optical microscope? If so, how can it actually be done?
