Polishing Sandstone | Using Polisher/Sander and Dremel
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- เผยแพร่เมื่อ 6 ก.ย. 2024
- We found a large piece of sandstone and broke it into smaller pieces! This video shows me polishing one of those smaller pieces.
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I used information from geologyscience... to help me make this video
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Thanks. That was very useful.
thank you ☺️
Loved this video! Tons of questions:
Did you have to dry a lot in between each different grit?
How do you know when to toothbrush off the dust?
How is your sanding disc set up and the area around it?
Do gloves protect you from getting hurt during the lower # grits or do you wear them for a different reason?
Finally I wonder if you can help me with this. I read:
"One way of checking the hardness of a stone is to try to scratch it with a penknife. If the knife cuts a mark or produces a powdery line, then the stone will not polish. If the knife leaves a metallic line, then the stone is harder than steel and it will polish. "
I would imagine this sandstone would scratch powdery, gritty or white, meaning it wouldn't polish well, so I'm surprised that you polished it. (They go on to say: "This is not to say that softer stones, such as serpentine, cannot be polished, but they must only be polished with other stones of similar hardness and not mixed with harder stones") How would the stone in the video scratch if you took a penknife to it? And what do they mean by 'metallic line' with a harder stone?
Much thanks!!! Hitting your coffee fund!
thank you so much!! 💜
no, I did not let the stone dry. when I wasn't actively polishing it sat in a tub of water.
I knew when to toothbrush off the dust because it was getting trapped in small crevices. usually, when going over the surface with the sanding discs I'll see those small crevices start to clear out. but in this case, it was building up.
this is a variable speed polisher that we have mounted to a table and it's surrounded by a plastic dish tub. here's a video that shows that a little better - th-cam.com/users/shortsJgH60AFI4ao?feature=share
these are nitrile gloves and they do offer protection from quick touches, even on the low grits. I started off wearing leather gloves but as my handling skill has increased I've switched to nitrile gloves because it's easier to hold and maneuver the rock with nitrile gloves vs leather gloves.
it sounds to me like they are talking about rock polishing in a tumbler because they're saying "they must only be polished with other stones of similar hardness". I've polished several stones that would be scratched by a pen knife. fluorite and marble are the first that come to mind and they polish beautifully.
I just went and scratched a raw piece of sandstone with a steel pocket knife and you were correct, it was white and gritty. ☺️
I think by metallic line they mean that instead of leaving a scratch in the stone, you'll just see the metal rubbing off on the stone indicating that the stone is harder than the knife.
thank you so much for your support and your excellent questions!! 😁
Wow that turned out excellent!
thank you! :)
Love the easy way you show here thank you🎉 so🎉 much❤
no problem 😄 thank you! 💜
Awesome video! Love the sparkles thanks for sharing👏
thank you so much! ☺️
I loved your video! I’ve only started collecting rocks in the last 2-3 years. Purely by accident lol
I have maybe a dozen smaller (quarter to half dollar sizes) sandstone rocks. They look so beautiful when wet and finally sat down to see if there’s a way to polish them. Although, I’m not sure with mine being smaller if your method here would work. Do you have any other suggestions?
hi thank you! 💜 sorry it took me so long! I would suggest trying a Dremel. We actually just uploaded a video on how to polish rocks with a Dremel you should check it out and let me know if you have any questions!
Love the video! I have several larger pieces of basalt and sandstone which I’m starting to polish and this was one of the few videos that I found which focused on that kind of rock! If you have any recommendations/links on basalt polishing I’d love to see them!
Questions:
Are you using just a standard tooth brush? Or would you recommend a wire brush? I have a set of stainless steel/nylon/copper brushes that I’m considering using but don’t want to mess up my progress!
Also would you recommend cleaning and scrubbing with soap between each stage?
2. If my rock still has several pits after the first stage, should I keep sanding until they’re all gone? I don’t want to take too much size off the rock.
3. Have you ever used a polyurethane sealant after applying the mineral oil?
Thanks!
Thank you! I'm glad you found us! I haven't polished any basalt yet, so I unfortunately don't have any recommendations. Sorry about that. I can answer your questions though!
Just a standard toothbrush. I think you're right, using metal brushes will most likely leave scratches on your work. I would not do that! You can get soft, medium, or hard toothbrushes so you have some variety in the brush strength.
I think scrubbing your stone in between stages is best. You don't need to use any soap, just water. I have a brush attached to the bottom of my rinse bucket so I can scrub and rinse at the same time, and then I have the toothbrush for more stubborn spots.
If you want a smooth surface you'll have to keep going on the lowest stage until you get the pits out. I know that can be frustrating when you want to preserve material, but it will result in a smoother finish at the end.
I have never used polyurethane on my rocks, that's an interesting idea I haven't even considered! Maybe I will give that a try. Have you ever done it? If so- do you have any tips? Mineral oil on a well-polished rock will last for a long time. You could always rub it again to bring the shine back out. The polyurethane would be permanent so that's nice!
Thanks for your comment and great questions!
Thanks! Seems like there’s a million different approaches and philosophies to rock polishing so I’ve been all over the place with my research 😅.
I just finished the first stage on my basalt and it looks great, although there are still some pits remaining. I’m ok w those since I don’t want to lose any more material. Do you think the pits will have an issue w the polish? I assume that the polish should come out fine for the flat sections and then I’ll just have to accept the pits as they are.
I have a piece of sandstone which turned out great after the first stage as well.
I haven’t tried the polyurethane yet but am more interested in this than the mineral oil since I’d like to avoid the oils collecting dust (I’ve heard that’s an issue) and also because I’ve accepted I likely won’t get a true polish with the tools I have (just using diamond pads on a hand drill) - so the poly will bring out the wet look and then I’ll likely do a final resin as well.
@davidromoser6148 I think you're right about the pits you'll just have to accept them as is. It would be good to keep them cleaned out with a brush during polishing and with the poly finish it's going to look great!
I wanna touch it! It looks so smooth!!! How long did this process take from start to finish?!!!
several days including dry times. active polishing work only took a couple of hours 😁
typically stones don't take long to dry but sandstone is porous and holds water so it took longer than usual
That’s turned out to be beautiful. 😱 May I ask how you built your set up with the grinding tool and which one you used? My son and I went out and found some neat rocks and quarts and I think this would be a fun way to keep us both entertained 😬
this shows how we have the tool mounted-
th-cam.com/users/shortsJgH60AFI4ao?si=9VCRexrF_F4AuRnQ
here's the polisher I'm using- www.harborfreight.com/10-amp-7-in-variable-speed-rotary-polishersander-57384.html
I'm using silicon carbide sanding discs that I purchased from Amazon. pay attention to the pad size that comes on the polisher, and size of the sanding discs you get. you may need to get a back pad that will match the sanding disc size.
you can also hold the polisher in your lap just set a towel down underneath it to protect your skin 😁
discord.gg/WHNufJJh
you can join our rock talk discord if you'd like to share pictures or ask questions 😁
how did you set up your sander
here's a video showing you how we did it-
th-cam.com/users/shortsJgH60AFI4ao?feature=share