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Thread: Seahorse in Limestone

  1. #1
    Join Date
    Mar 2005
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    San Jose, CA, USA
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    Default Seahorse in Limestone



    At my first Camp Shopbot there was discussion about working with marble and limestone. Thirteen years later I'm still enjoying these types of projects.

    Roughing pass with a 1/2" ballnose bit at 15% stepover.
    Finish pass with a 1/8" ballnose at 7% stepover.
    The carving is about 12 inches tall and about 0.4" deep
    Attached Images Attached Images
    Last edited by rcnewcomb; 09-15-2018 at 05:56 PM. Reason: typo correction
    - Randall Newcomb
    10 fingers in, 10 fingers out
    another good day in the shop

  2. #2
    Join Date
    Mar 2017
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    Billings, MT
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    Default

    That is super cool

  3. #3
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    Jan 2011
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    gleason, wi 54435
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    Nice job Randall. I have carved marble but the bit broke when it hit a hard vein of something. Limestone looks nice. Did you just use a regular carbide bit? Anything special to keep the abrasive dust out of your spindle?

  4. #4
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    Quote Originally Posted by bobmoore View Post
    Did you just use a regular carbide bit?
    Yes. Normally I'd just use my dull bits from woodworking. However, I didn't have any and I didn't want to use a brand new tapered long reach 1/8" on stone.

    I had an 8 pack of bits that I bought for $10. Half of those so far broke just while putting them in the collet, but this one survived and worked reasonably well.


    Quote Originally Posted by bobmoore View Post
    Anything special to keep the abrasive dust out of your spindle?
    My spindle has a pressurized case since it is used with an ATC.
    - Randall Newcomb
    10 fingers in, 10 fingers out
    another good day in the shop

  5. #5
    Join Date
    Apr 2013
    Location
    Kennebunkport, Maine
    Posts
    4,260

    Default

    NICE Randall!
    Is that one your neighbor's pavers (inspected carefully), or did you visit a stone supplier so you didn't smoke another carbide bit?
    You didn't always have one of Gary's "Dream Machines", did the dust from Marble ever cause problems on any of your old machine's rails/bearings/spindle?
    Desktop with HSD spindle here with the fan as part of the spindle(if spindle going,fan is going same rpm).
    Only carved native Slate(nice and dust never rose at 14K) and Iceland Spar(not so nice and microchips flew--Very defined brittle cleavage lines) so far.
    Did the dust pretty much sit there while carving, or blow around a bit.
    Is it the same with Marble?
    Looks like you're having fun
    scott
    scott P.
    2013 Desktop/spindle/VCP 10
    Maine

  6. #6
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    Quote Originally Posted by scottp55 View Post
    Is that one your neighbor's pavers (inspected carefully), or did you visit a stone supplier so you didn't smoke another carbide bit?
    I went to a nearby stone wholesaler to see if they had remnants or cutoffs. They don't do any fabrication, but they directed me to an industrial park about a half mile aware where there are a dozen stone fabbers. I walked up to one and asked if they had smaller pieces they would sell me. I selected two pieces , one about 14x17 and the other about 15x21. Both were were 20mm thick. He said I could have them for free. I'll bring them the Seahorse this week to say thank you (plus to demonstrate what I can do in case this Silicon Valley gig doesn't work out.


    did the dust from Marble ever cause problems on any of your old machine's rails/bearings/spindle?
    My first machine was a PRT Alpha with a Porter Cable router. In addition to the dust foot I also held a shop vac hose near the bit. We got about 3 years out of that router before we had to replace the bearings. We seldom ran the router above 16K RPM. The router did tend to bog down on deeper cuts with larger diameter bits, so for stone carving we kept the feed rate down around 1 IPS. I don't hear the spindle bog down.
    ->Link to YouTube video



    > Did the dust pretty much sit there while carving, or blow around a bit.
    The router blew it around a lot.

    > Is it the same with Marble?
    Yes

    Looks like you're having fun
    scott[/QUOTE]
    - Randall Newcomb
    10 fingers in, 10 fingers out
    another good day in the shop

  7. #7
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    Apr 2013
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    Kennebunkport, Maine
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    Thanks for the answers and the vid Randall!
    Gives me a better idea of what to expect.
    I'd probably just be doing VCarving using Drillman1's .125" $4 bits on my marble tiles for trials.
    I'll watch for spindle dust on a small test, as the 1hp HSD is considered a throw away
    Hope the stone fabbers like it and toss some work your way
    Thanks again!
    scott
    scott P.
    2013 Desktop/spindle/VCP 10
    Maine

  8. #8
    Join Date
    Mar 2005
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    San Jose, CA, USA
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    Default

    Another limestone piece: 15.5x22
    Attached Images Attached Images
    - Randall Newcomb
    10 fingers in, 10 fingers out
    another good day in the shop

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