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Thread: Large Coving Bit
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7th March 2014, 04:33 PM #1Member
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Large Coving Bit
Can anyone tell me where I can source a large radius coving bit, without a guide bearing? I need to rout a channel of approx diameter 60mm. While this is large, I only need to rout about 15 mm deep - I don't need a complete hemisphere. Consequently it doesn't need the full 60mm. To visualise what I'm trying to say, imagine a hard ball of diameter 60 mm pressed 15 mm into, say, soft mud. The diameter of the indentation would be around 52 mm even though its a section from a 60 mm sphere. A bit like the indentations on a large wooden solitaire board, but for tennis balls rather than glass marbles.
If necessary I could make the indentation less than 15mm deep, thereby making the diameter of the indention less than 52 mm, provided the profile corresponds to a 6omm diameter sphere.
Looking at a few on-line catalogs they seem to be smaller diameter but relatively deep (complete semi-circle profile). What I need is something broader, but not necessarily deeper.
Thank you.
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7th March 2014, 05:08 PM #2Skwair2rownd
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You can do a cove like that on a tablesaw. Look up how to do this on Google.
I would run some cuts along and across the piece to make life easier.
pushing the length through the saw needs to be done slooooowly.
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7th March 2014, 05:10 PM #3Senior Member
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http://www.envirocatalogue.com.au/Ca.../index.html#16
Carb I tool catalogue page 16, 63.5mm diam and 17mm depth.
Cheers
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7th March 2014, 05:17 PM #4Member
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7th March 2014, 05:20 PM #5Member
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That was my first thought too and I've been trying this this afternoon on a Triton Workcentre (yes, I know). I found it difficult to get the angle correct. First attempt was too shallow and the second try was too narrow. That's when I thought doing it on a router table might be easier.
Thanks for the suggestion.
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