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Need to cut a circle in concrete block wall MiamiCuse 09-13-2008
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Posted by MiamiCuse on September 13, 2008, 9:13 pm


I have to install an outdoor shower for a rinse off to the pool. The shower
valve has a solid brass body and I have to cut a hole about 7" in diameter
to recess the valve into it.

How can I cut a 7" diameter for this? The trim is not much bigger so a
clean cut would be necessary. My thinking is that I draw the outline on the
concrete wall, then drill holes (many holes) along the perimeter using a
hammer drill. Any other ideas greatly appreciated.

MC



AppliancePartsPros.com, Inc.
Posted by on September 13, 2008, 9:57 pm


On Sat, 13 Sep 2008 21:13:44 -0400, "MiamiCuse"

>I have to install an outdoor shower for a rinse off to the pool. The shower
>valve has a solid brass body and I have to cut a hole about 7" in diameter
>to recess the valve into it.
>
>How can I cut a 7" diameter for this? The trim is not much bigger so a
>clean cut would be necessary. My thinking is that I draw the outline on the
>concrete wall, then drill holes (many holes) along the perimeter using a
>hammer drill. Any other ideas greatly appreciated.
>
>MC
>


Do you have a router or a rotozip? You can rig that to a center pivot
and cut a perfect circle with a carbide bit.

Posted by MiamiCuse on September 13, 2008, 10:44 pm



> On Sat, 13 Sep 2008 21:13:44 -0400, "MiamiCuse"
>
>>I have to install an outdoor shower for a rinse off to the pool. The
>>shower
>>valve has a solid brass body and I have to cut a hole about 7" in diameter
>>to recess the valve into it.
>>
>>How can I cut a 7" diameter for this? The trim is not much bigger so a
>>clean cut would be necessary. My thinking is that I draw the outline on
>>the
>>concrete wall, then drill holes (many holes) along the perimeter using a
>>hammer drill. Any other ideas greatly appreciated.
>>
>>MC
>>
>
>
> Do you have a router or a rotozip? You can rig that to a center pivot
> and cut a perfect circle with a carbide bit.

I do have a rotary tool (a cheap imitation of Rotozip). I guess may be I
can use it if I can buy the gadget that makes it go around like a compass.
Will the carbide bit really be able to cut concrete I remember using it to
cut drywall and remember it being a bit flimsy.

Thanks,

MC



Posted by on September 13, 2008, 10:50 pm


On Sat, 13 Sep 2008 22:44:37 -0400, "MiamiCuse"

>
>> On Sat, 13 Sep 2008 21:13:44 -0400, "MiamiCuse"
>>
>>>I have to install an outdoor shower for a rinse off to the pool. The
>>>shower
>>>valve has a solid brass body and I have to cut a hole about 7" in diameter
>>>to recess the valve into it.
>>>
>>>How can I cut a 7" diameter for this? The trim is not much bigger so a
>>>clean cut would be necessary. My thinking is that I draw the outline on
>>>the
>>>concrete wall, then drill holes (many holes) along the perimeter using a
>>>hammer drill. Any other ideas greatly appreciated.
>>>
>>>MC
>>>
>>
>>
>> Do you have a router or a rotozip? You can rig that to a center pivot
>> and cut a perfect circle with a carbide bit.
>
>I do have a rotary tool (a cheap imitation of Rotozip). I guess may be I
>can use it if I can buy the gadget that makes it go around like a compass.
>Will the carbide bit really be able to cut concrete I remember using it to
>cut drywall and remember it being a bit flimsy.
>
>Thanks,
>
>MC
>

I made a jig to cut circles out of plywood with my cheap router and I
had the depth about 1/4" too deep on the last one. I ended up with a
perfect circle in the concrete. You could test it on a spare block.
You probably don't need to cut all the way through to get a decent
edge. You are still going to have to chip out the center and chip back
to your scored circle.


Posted by DerbyDad03 on September 13, 2008, 10:02 pm


MiamiCuse wrote:
> I have to install an outdoor shower for a rinse off to the pool. The shower
> valve has a solid brass body and I have to cut a hole about 7" in diameter
> to recess the valve into it.
>
> How can I cut a 7" diameter for this? The trim is not much bigger so a
> clean cut would be necessary. My thinking is that I draw the outline on the
> concrete wall, then drill holes (many holes) along the perimeter using a
> hammer drill. Any other ideas greatly appreciated.
>
> MC
>
>

Get a nice looking piece of 12 x 12 tile or something similar to mount
on the wall - something that you can cut more easily. Then you won't
have to be as concerned about the neatness of the hole in the block
wall. Form follows function.


Build a kind of shelving system with a box to hold the faucet so you
don't have to recess the valve body in the wall. You know, blend the box
into some shelves to hold shampoo, soap, whatever. Form follows function.


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