r/metalworking 3d ago

How to polish a brass hammer?

Post image
39 Upvotes

29 comments sorted by

14

u/Ecstatic-Tank-9573 3d ago

Basic 400-grit sandpaper to get the rough spots, moving to 800 then 1200. Finish with generic polishing compound and buffing. It won’t be perfect but close enough.

5

u/Environmental_Lab965 3d ago

Looks pretty clean. Id do 600-1200-2000 then buffing compound.

1

u/averagesizedideas 3d ago

Stupid question--is this hand sanding, or can I put onto a belt or orbital when working with metal? (I'm a woodworker).

5

u/KokoTheTalkingApe 3d ago

Woodworker here. An ROS might actually be slower, because each grit has to remove the scratches left by the previous grit. This hammer is already brushed, meaning it has lots of tiny scratches all going the same way. If you just knock down the high spots, the deeper scratches can remain because they look like they belong. Though an ROS does leave an interesting scratch pattern!

1

u/SoDamnGreasy 2d ago

It's probably better to use a belt sander with metal.

1

u/Consistent-Slice-893 2d ago

I wouldn't. Brass and aluminum will gum up a belt in short order.

1

u/Consistent-Slice-893 2d ago

The secret to metal polishing with sandpaper is to go at 90-degree angles to the last grit, unlike with wood, which is with the grain. Brass will load up the paper, so use the sandpaper wet. When I get done, I like to give it a quick coat of RenWax or Johnson's paste wax to keep the surface from oxidizing. I tend to stop at 1200 grit on brass, it leaves a not quite mirror finish, just minimally shiny which looks good on knife cross guards and bolsters. There might be problems with laser engraving if you go fully buffed finish.

10

u/lanik_2555 3d ago

You can polish it by hand.

And If you want it really shiny, you can use metal polish and leather.

10

u/hotdogpartner 3d ago

Dude if you're not sure that's 100% brass, don't go near it. Berrylium copper looks very similar, and is commonly used in non sparking tools, grinding or sanding that stuff is bad fuckin news.

4

u/KokoTheTalkingApe 3d ago

Wouldn't beryllium copper be a lot more expensive?

3

u/averagesizedideas 3d ago

Ooooh good to know. The product description says 100% brass but I’m never surprised if an Amazon product has false description.

4

u/AcceptableSwim8334 3d ago

It probably has a small bit of lead in it and it definitely has zinc in it, both of which are not healthy when breathed so wear a mask when polishing.

5

u/macthebearded 2d ago

Beryllium copper tools are also massively more expensive than their normal counterparts. I promise nobody is sneakily selling you that instead of brass, Amazon or otherwise.
Here is an example.

That guy must have read that somewhere and is mindlessly regurgitating it. The comment is nonsense and this is not something you need to worry about.

1

u/hotdogpartner 1d ago

Not nonsense, safety shouldn't be disregarded. My beryllium copper hammer is the same color, and I work with beryllium copper electrical contacts which are the same color or a bit darker.

2

u/averagesizedideas 3d ago

Context: I bought a non-sparking hammer (allegedly 100% brass) as a gift for a friend, to congratulate him on a cool event for his construction company. I’d like to smooth it out before getting it laser engraved. Is that possible?  What is the best process for brass?

Will a sander or flap disc work for this? Or do I need a buffing wheel/compound?  I don’t have a lot of experience working with metal. Thanks in advance!

3

u/DadEngineerLegend 3d ago

Maybe ask the Laser etcher first about a polished surface. I'm not sure, just guessing, but a polished surface may be an issue and make it much harder to etch properly.

Anyway, it doesn't look too bad. A buffing wheel and polishing compound will clean it up pretty quick. Assuming it's actually brass and not coated steel or aluminium.

Some brasso might even get you close enough.

2

u/WoketrickStar 3d ago

I thought brass tools still spark. I thought all non spark tools were copper beryllium.

1

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1

u/Designer_Situation85 3d ago

Spin a buffing wheel onto a bench grinder and some rouge and go to town.

1

u/timmio11 2d ago

If you do sand it wear a good respirator. Copper poisoning is Nasty.

1

u/Fragrant-Cloud5172 2d ago edited 2d ago

I’d use Scotch-Brite. There are numerous grits available. For me I prefer to use a pad on an angle grinder at very slow speed. But some hand polishing pads, like the white one, may be good for you.

https://www.patinas.com/scotch-brite-pads

https://www.3m.com/3M/en_US/metalworking-us/products/flat-stock/hand-pads/

1

u/basswelder 2d ago

Why? Would it being shiny help its function? I think not. Brasso will make it shine like a white boys heel. Use a fine scotchbrite. I used to polish brass in the navy.

1

u/sweetooth89 2d ago

Scotch Brite then hand polished with flitz or another polishing paste or just buffed out on a buffing wheel if you're going for that look.

1

u/307blacksmith 2d ago

Automotive scotch bright discs on a die grinder or in a drill and then buff

1

u/Now_Melon1218 1d ago

deep breath. sigh. OP, What country are you posting from?

0

u/weelluuuu 3d ago

The least amount of effort would be to remove the handle and toss in a tumbler.

2

u/averagesizedideas 3d ago

I was thinking about removing it either way, but this Amazon cheapie hammer seems to be more of an epoxy attachment than classic wedge.

1

u/weelluuuu 3d ago

Bummer. Ever increasing grits until you reach the desired finish. Rub away!