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#594855 Wed Jan 28 2015 12:03 PM
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Ok...I know its a general NO NO, but I have some signs that have rotted holes and was to make new safe holes. What should be used...A diamond Tile bit, or Kobalt Drill bit...What do the pros use?

Let me know and appreciate it. If you would not want to help...think of it more as saving a sign from destruction if I do it wrong...

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Man Cave #594858 Wed Jan 28 2015 12:11 PM
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ceramic drill bit (or a diamond-tipped hole saw)

use duct tape on surface to keep the bit from 'walking' when you start

(same process that's used for tile, sink, tubs, etc)


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BryceG #594862 Wed Jan 28 2015 12:57 PM
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Do you mean the goofy looking ones that actually do not resemble a bit...more like a small hole saw

Man Cave #594865 Wed Jan 28 2015 01:05 PM
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yes... they look like a little bit like a mix between the two... and the diamond tip ones look like a normal hole saw.

with ceramics, you go slower, not faster.

I am speaking from very little experience too!... so take my advice lightly, I'd research the net for some tips

drilling thru a sign may require multiple steps, one to get thru the porcelain, the other to get thru the steel


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BryceG #594866 Wed Jan 28 2015 01:10 PM
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That is exacly what I was wondering...I think I will try it like that...bust porcelain...then take out the Kobalt steel tip

Man Cave #594886 Wed Jan 28 2015 02:39 PM
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Ad some tap oil to keep the drill bit cooler.

60wayne #594929 Wed Jan 28 2015 04:46 PM
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If your going to hang the sign up, why not simply drill screws into the wall, with washers that overlap the sign, and hold it in place withougt new holes?
Whatever you do, do yourself a favor and wear a respiratory mask while doing the drilling!

Last edited by 2 Gallon Luke; Wed Jan 28 2015 04:47 PM.

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2 Gallon Luke #594930 Wed Jan 28 2015 04:50 PM
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sounds like neon signs in the making


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KZ1000 #594960 Wed Jan 28 2015 06:44 PM
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Can anyone that went to Columbus Gas Show recall seeing the huge trailer and revolving neon sign? They were selling porcelain/neon signs. I asked the gentlemen how they would drill porcelain. Need 1/2 inch hole ? Drill 1/2 inch thick wood board with 1/2 inch drill bit. Clamp board to porcelain at point you want to drill hole. Sandblast porcelain through hole in board , removing porcelain coating. Remove board . Mark hole and drill hole with metal drill bit. That's the lil bit I know about it !!Dan

pumpdoc #594964 Wed Jan 28 2015 07:00 PM
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I have replied to pretty much the same question before.
My neon guy uses a Dremel tool to first remove the porcelain.

pumpdoc #594968 Wed Jan 28 2015 07:04 PM
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I'll jump in the fray. I have an original neon sign that had tabs on the back to attach the can. Ninety percent of the tabs are gone. I dont know of any process I could use to re-attach tabs without drilling holes through the porcelain. If you know an alternative I would love to hear it. It's got to be strong, the sign and can will be hefty and I don't want to find it laying on the floor in a pile of rubble.

hri_2008 #594969 Wed Jan 28 2015 07:05 PM
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Anybody needing 1/2" holes is not for hanging.

blacktee #594985 Wed Jan 28 2015 07:58 PM
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Do you mean tabs on the edges or just the flat back of the sign?


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Craig Osbeck #594990 Wed Jan 28 2015 08:06 PM
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Tabs on the edge, back side. Come off sign at 90 degrees, can mounts to tabs. I plan to drill 1/4" holes and screw directly to flange on can I'm making.

wolf1980 #595019 Thu Jan 29 2015 05:22 AM
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A half inch hole isnt very big. By the time you put a grommet in there you have a smaller hole- like for hanging. When they punch for neon, doesnt it require a larger hole? like 1" or something like that? A good-even just decent, diamond core bit should go through just about anything-cooled with water. Porcelain is hard, but diamonds are harder.You would be best to use drill press type rig.Whats that they say about haters? Haters gonna hate. Fakers gonna punch. Crooks gonna hamma. PS-I hate punchin.

Last edited by JimT; Thu Jan 29 2015 05:27 AM.
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