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“Stone Sammich” - Ash Burl and black marble sandwich bowl

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Project by Ugarx17 posted 11-04-2018 01:52 AM 302 views 0 times favorited 3 comments Add to Favorites Watch

Take a look at my second project turning stone wood hybrids. My first being a segmented cherry ring of very similar design.

I am actually unsure of the wood species, it is not a common tree but was harvested in NW Georgia. It’s almost a cherry, but this would be very uncommon in this neck of the woods. Any help in identification would be great.

Anyways, it is 6.5” wide and ~4 inches tall with two 3/4” slabs of black marble from an old fireplace slab. A waste block has also been attached with resin with the tenon turned. Ensuring wood is dry to minimizing warping is key. No flexion in the marble bound to a warped piece of wood spinning at 600rpm. Bad plan.

As much as possible of the marble was cut with an angle grinder. Then, with a belt sander and 36-grit zirconium belts sand until round. Once completed smooth the lathe can be turned on with the belt sander. My lathe has a swing arm for outboard turning (yea, you guessed it, it’s harbor freight) but that is ideal for positioning the belt sander to swing into the piece, making a flat surface to round the piece. I did use a carbide rougher for finishing scraping as the sander does not machine perfectly. Then, simply a lot of sanding to polish.

I still have a ton to learn, particularly with polishing marble. I’ve seen diamond pastes and diamond paper. I used standard sand paper, but as it got to higher grits it was less effective, and micromesh pads didn’t touch it. I actually applied spray poly to get the high gloss, it is not from polishing of the marble which I would prefer. Particularly because it hurts the cool texture of the marble and gives it a plastic-like feel.

But, a proof of concept as least. Let me know what you think, and I’d love if someone could identify the Burl.





3 comments so far

View leafherder's profile

leafherder

1578 posts in 2128 days


#1 posted 11-04-2018 04:31 PM

A very attractive bowl, I love the combination of colors with the wood and stone.

I have never tried polishing marble but I would suggest you check with some local experts on the subject – a jeweler who does lapidary work (cutting and polishing gemstones), a company that cuts and polishes stone countertops for kitchens and bathrooms, and a company that makes headstones and grave markers – different perspectives and different techniques and tools used but all of them should be able to point you in the right direction for stone polishing supplies and give you some advice on how to proceed The counter top and grave marker companies might also become a supplier of raw materials for you as they would have lots of scraps and off cuts from their own work.

Best of luck and I look forward to seeing more of your projects.

-- Leafherder

View swirt's profile

swirt

3312 posts in 3148 days


#2 posted 11-05-2018 12:26 AM

Very interesting. It certainly looks like a great combination. What did you use to stick the marble to the wood?

-- Galootish log blog, http://www.timberframe-tools.com

View Ugarx17's profile

Ugarx17

2 posts in 143 days


#3 posted 11-05-2018 01:42 AM



Very interesting. It certainly looks like a great combination. What did you use to stick the marble to the wood?

- swirt

Just a simple 5 minute epoxy. Very simple. It seems to have a small bit of flexion which makes me feel more comfortable being wood to stone

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