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post #1 of 40 (permalink) Old 11-16-2010, 06:08 AM Thread Starter
gav
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Default concrete router table top

Crazy idea or not ?
I've seen the threads on here where people have considered and even made granite tops for their router tables, and recently read this article about a home made tablesaw, and the guy makes a concrete top for it.
Fibre enforced concrete mixes are available pretty cheaply and it seem to me it would be easy to cast all holes and grooves in place.
Anyone heard of it being done, or have actually done it themselves ?
I'm sure it would cut down on vibration quite a bit and be quite flat and stable.

Just thinking out loud.
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post #2 of 40 (permalink) Old 11-16-2010, 07:33 AM
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Quote:
Originally Posted by gav View Post
Crazy idea or not ?
I've seen the threads on here where people have considered and even made granite tops for their router tables, and recently read this article about a home made tablesaw, and the guy makes a concrete top for it.
Fibre enforced concrete mixes are available pretty cheaply and it seem to me it would be easy to cast all holes and grooves in place.
Anyone heard of it being done, or have actually done it themselves ?
I'm sure it would cut down on vibration quite a bit and be quite flat and stable.

Just thinking out loud.
That much deep thinking Gavin can be dangerous. VIBRATION, if all is running correctly there shouldn't be any. Think about when you drop a cutter on the table and don't we all at sometime. Basic router tables have stood the test of time and although bells and whistles have been added over the years a strong bench with a tall adjustable fence is capable of superb work, in the right hands of course.

Now then, going back to my days in esoteric Hi-Fi, when Vinyl discs were the media, it was quite common to sit the expensive turntable on a Marble slab which in turn was sat on four squash balls, this gave perfect isolation from the outside world. You must realise that such audiophiles would invest between $1000.00 and $3000.00 on a turntable and another $500.00 to $1000.00 on a moving coil cartridge. Those were exciting days in my long career.

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post #3 of 40 (permalink) Old 11-16-2010, 08:50 AM
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Sounds like a neat idea! You could coat it in self leveling epoxy, or some other concrete sealant.
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post #4 of 40 (permalink) Old 11-16-2010, 08:57 AM
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Hello gav ! I read Harry's post, and I believe He said it all. If You drop a steel bit on concrete, You would have to sharpen it. Drop a carbide bit, and it's broken into pieces. Consider what carbide cost! and it's a no brainier, I would use wood ply or another flat substrate as osb, and such. Good luck on whatever You chose to do!

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post #5 of 40 (permalink) Old 11-16-2010, 09:05 AM
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Hi Gav

Probably not so crazy, but quite probably a lot of work. I have to agree with Harry that if all is running well there shouldn't really be all that much vibration. It's often the lower speed stuff, like spindle moulders and table saws which have large diameter tooling which benefit from extra mass.

I've made form work for fibre-strengthened concrete and I know that the fibre they use is UHMW-PE. I'm lucky enough to have several firms in this vicinity who machine this (one makes plastic hip joints) but the fibre is available from a limited number of builders merchants. How were you planning on flattening off the top? The concrete guys use a special angle grinder (called a floor grinder) but it doesn't finish off perfectly so the flooring contractor almost always seems to screed with a layer of lates before adding flooring carpet tiles, vinyl, etc. Latex wouldn't be suitable (too soft) for your purpose but I understand that those firms making concrete countertops add an epoxy admixture to the concrete and polish out with a wet random orbit (due to the extremely fine dust)

As for dropping carbide onto concrete, it's probably no worse than dropping it onto the cast iron table of a static machine such as an overhead pin router or the like. The sort of thing you do once and never repeat!

If you do go ahead I'd be interested in seeing how you get on as I'm really interested in the possibility of making my own concrete kitchen worktops.
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post #6 of 40 (permalink) Old 11-16-2010, 09:30 AM
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I'd suggest the new Swedish TempurConcrete - firm where you need it to be, but soft as a cloud when a bit goes to sleep on it.

- Ralph
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post #7 of 40 (permalink) Old 11-16-2010, 10:03 AM
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" Concrete " O No it must be a full moon again

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post #8 of 40 (permalink) Old 11-16-2010, 11:16 AM
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of course it would work fine... Worthless though if you ever have to move. I'm too old to move my LP and CD collection let alone a concrete slab..
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post #9 of 40 (permalink) Old 11-16-2010, 11:45 AM Thread Starter
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Bob, no full moon tonight but I do kind of look like a wolfman at the moment.

So, apart from it being overkill and hard to move, so far the only downside seems to be the fact that bits could be damaged if dropped on it.
I wonder if 5 coats of polyurethane would soften that blow ?

Are bits damaged when dropped onto cast iron ?

I was considering upgrading my tablesaw top to concrete, like the link I posted, and just thought it could double as a router table.

I'm also considering making a bandsaw out of wood. Like the one here
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post #10 of 40 (permalink) Old 11-16-2010, 01:03 PM
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Hi Gav

Now I'm press Impress with home made band saw but I don't think many could get it done, it's take very spec.person to do that build up..having plans it one thing but to get it right that's something else..
Band saws are cheap now days and have been around a long time, you can rework just about any of the band saw on the market and make them run very smooth and quite but after all it's just a band saw..not a steel mill..he said you can make it cheap, I don't think so, bicycle tubes are cheap but not the other parts that are needed..just the motor alone is 100.oo bucks....think down the road a little bit some day you may want to sale it and get a real one ,what do you think you can get for a home shop one..or to say what would you pay for home shop one.....

If you make one I would love your feed back on it and picture of your bill fold after the build up..

I have dropped bits on a cast iron table and no damage now I have dropped them on the floor also and I have damage one or two in the many years I have used them..
I think it's how they hit..I did drop a solid carb.bit and it broke the bit into two parts and it was only a 3 ft.drop to the floor..some days you are lucky and some days your not..

"concrete /mable" for any table saw or router table your nuts, I see some table saws have them and they crack me up every time, once they crack or chip you have a real nice boot anchor ...and they will crack or chip over time unlike cast iron or Alum.tops..

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Originally Posted by gav View Post
Bob, no full moon tonight but I do kind of look like a wolfman at the moment.

So, apart from it being overkill and hard to move, so far the only downside seems to be the fact that bits could be damaged if dropped on it.
I wonder if 5 coats of polyurethane would soften that blow ?

Are bits damaged when dropped onto cast iron ?

I was considering upgrading my tablesaw top to concrete, like the link I posted, and just thought it could double as a router table.

I'm also considering making a bandsaw out of wood. Like the one here



"It's fine to disagree with other members as long as you respect their opinions"

Marc Sommerfeld Tools ,Videos
http://www.youtube.com/channel/UCT-n...RWaEpMA/videos

Find all threads started by bobj3
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Last edited by bobj3; 11-16-2010 at 01:37 PM.
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