Drilling

RIDGID · 02/15/2018, 11:00 AM

can two 1-3/4" holes be drilled one inch apart in low iron glass?*

ClownNut · 02/15/2018, 11:01 AM

i wouldnt keep those this close. maybe 3-4"

mcgyvr · 02/15/2018, 11:10 AM

well..yes they can
The bulkhead flanges will almost be touching though (assuming a 1" bulkhead with roughly a 2-5/8 flange)and its best to not have them that close..

nereefpat · 02/15/2018, 11:21 AM

I would feel better with about 1-3/4" between them.

ca1ore · 02/15/2018, 11:38 AM

It's a bit risky. General guidance is one hole diameter of glass between the edges of the two holes. Grinding them that close raises the risk of a crack. I certainly would not try it for two holes that were low down in the tank, and subject to greater pressures.

gonereefing654 · 02/15/2018, 12:07 PM

I would really look harder for an other way to do these overflows.
The location of the holes on the tank will matter. Also how thick the glass is could help or hurt.

02/15/2018, 11:00 AM	#1
RIDGID Registered Member Join Date: Nov 2017 Posts: 20	Drilling can two 1-3/4" holes be drilled one inch apart in low iron glass?*

02/15/2018, 11:01 AM	#2
ClownNut Registered Member Join Date: Sep 2004 Location: Minnesota Posts: 1,859	i wouldnt keep those this close. maybe 3-4" __________________ Dont let me know where u lived if u have a nice pair of clownfish in ur tank!^_^ Clown kidnaper^_^ Current Tank Info: 300DD, SM200/RD3,ATI 60-8X80+4X75, 2 Sea Sweep & 4X6105 & 6208

02/15/2018, 11:10 AM	#3
mcgyvr Registered Member Join Date: Sep 2003 Location: North Carolina Posts: 20,050	well..yes they can The bulkhead flanges will almost be touching though (assuming a 1" bulkhead with roughly a 2-5/8 flange)and its best to not have them that close.. __________________ Who me?

02/15/2018, 11:21 AM	#4
nereefpat Registered Member Join Date: Apr 2016 Location: Central Nebraska Posts: 3,190	I would feel better with about 1-3/4" between them. __________________ Pat Current Tank Info: 125 in-wall , 40b sump. 6 bulb T5. ASM G2 skimmer. LPS and leathers

02/15/2018, 11:38 AM	#5
ca1ore Grizzled & Cynical Join Date: Apr 2006 Location: Stamford, CT Posts: 17,319	It's a bit risky. General guidance is one hole diameter of glass between the edges of the two holes. Grinding them that close raises the risk of a crack. I certainly would not try it for two holes that were low down in the tank, and subject to greater pressures. __________________ Simon Got back into the hobby ..... planned to keep it simple ..... yeah, right ..... clearly I need a new plan! Pet peeve: anemones host clowns; clowns do not host anemones! Current Tank Info: 450 Reef; 120 refugium; 60 Frag Tank, 30 Introduction tank; multiple QTs

02/15/2018, 12:07 PM	#6
gonereefing654 Registered Member Join Date: Aug 2012 Location: Corona, CA Posts: 51	I would really look harder for an other way to do these overflows. The location of the holes on the tank will matter. Also how thick the glass is could help or hurt.