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Concrete machine bench?
srm_92000:
Hi,
My dad made a bench for his wood lathe as basically just a wooden box (fairly thick top piece) with legs, then, when all in place filled it with about 5or more bags of sand - doesn't move anywhere fast! but you can always get it out if needed.
Cheers
Steve.
75Plus:
--- Quote from: John Hill on July 01, 2011, 04:56:50 PM ---
I will be pretty upset if it cracks!
--- End quote ---
I recently had 35 cu. yards of concrete poured for a driveway and parking area. The concrete guy assured me that there were 3 positives about concrete.
1. It will get hard.
2. No one will steal it.
3. IT WILL CRACK :bugeye: :med:
Joe
owenh:
I made a concrete benchtop for my little atlas a few years ago, just built a form on the shop floor upside down with the holes for attaching the bits cast in place. I used bits of plastic water pipe. I finished it with automotive plastic body filler and painted it. i'm quite happy with it.
John Hill:
--- Quote from: 75Plus on July 01, 2011, 10:08:56 PM ---
3. IT WILL CRACK :bugeye: :med:
Joe
--- End quote ---
I think you used the wrong contractor to pour your concrete. We use a lot of concrete around here, driveways, houses, boats, furniture and we dont expect it to crack. Driveways etc we put saw cuts in to prevent cracks.
PekkaNF:
--- Quote from: 75Plus on July 01, 2011, 10:08:56 PM ---3. IT WILL CRACK :bugeye: :med:
Joe
--- End quote ---
NO it will not!.
* You need correct amount of reinforcement, probably two meshes or what ever is that net made out of about 5-6 mm steel. You need spacers to place them to proper depth. Here you can find a plastic standoffs with varying height.
* Proper mix of concrete (too much water and it WILL shrink and crack), cast right and then don't waddle with the surface until you get the water out.
*Depending the air temperature, you may need to spray with water for a week and cover it with plastics to keep it from drying too fast.
* You also want to design it to avoid wild cross section variation, different thicknesses will dry/cure different speed AND shrink different speed AND that generates the cracks. Therefore, you probably want to make base and top separate.
Just my personal experience, I did need to find out basics of concrete when I did some home renovation.
Pekka
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