drilling existing 1" hole to 1.5" hole

soupa2

Plecostomus
MFK Member
Jul 18, 2007
942
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cyn
i currently own a marineland 300 gallon deep dimension tank and all the 4 bulkheads are drilled out for 1" PVCs.. i spoken to marineland and they said the bottom glass 19mm (3/4") thick glass is NOT tempered.. in 4-5 months later i'm going to move to a new house and i was thinking if i should drill out the tank from a 1" hole to a 1.5" bulkhead hole? if existing hole there and drilling you need to keep bit cool from over heating so always keep it in water but problem is there is a hole already there.. how would you solve this issue???how to drill it perfectly??
 

DB junkie

Gold Tier VIP
MFK Member
Jan 27, 2007
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Glass Holes sells jigs that suction cup to the glass, or you can just make one.... I just used a 1/4" slab of ABS plastic, some suction cups, and some rollerblade bearings/spacers for my home made one.

I've successfully enlarged several glass holes using a jig.......
 

soupa2

Plecostomus
MFK Member
Jul 18, 2007
942
82
61
cyn
Glass Holes sells jigs that suction cup to the glass, or you can just make one.... I just used a 1/4" slab of ABS plastic, some suction cups, and some rollerblade bearings/spacers for my home made one.

I've successfully enlarged several glass holes using a jig.......
okay that solves the problem with enlarging the glass by not letting the glass hole wabble but how can you keep the hole saw cool since we usually keep a pool of water where we drill... how you combat this problem?? i don't like the idea of spraying the saw with water...
 

pshtex

Jack Dempsey
MFK Member
Nov 8, 2010
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united states
i think you should be ok just doing it by hand. In my experience from drilling glass holes by hand is that you need nice bright lights to make sure that you are not moving the bit around. Nice steady hands to make sure that the 1/4" spacing stays a 1/4" spacing. The drill bit cuts pretty precise, it more depends on you. The only thing i would say if you try it this way is to use a new bit for each hole. I used some $6 bits from amazon and used each bit for 2.5 holes, but due to the existing holes i would do new each time.
 

DIDYSIS

Mantilla Stingray
MFK Member
Feb 9, 2012
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If you have a friend or someone around you can have them just pour a steady little stream of water onto it. Or just ever 30 seconds works as well.

Sent from the Monster Fish Keeping App
 

soupa2

Plecostomus
MFK Member
Jul 18, 2007
942
82
61
cyn
okay.... how long does it take to drill out 3/4" thick glass??? if the hole saw was brand new and i only have one hole saw... will i have problem with 2 holes and how fast shall i set the drill speed to drill it out???
 

DB junkie

Gold Tier VIP
MFK Member
Jan 27, 2007
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Best to use a drill with a clutch, set it low so it just clicks out if it bites. I use high speed. I just use a 1/4" drip line and set something on it to hold it in place. Throw jig on and go.

Check out glass holes . com for videos that show the process.......
 

mudbuttjones

Fire Eel
MFK Member
Jul 29, 2014
1,375
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66
Wisconsin
uploadfromtaptalk1416636223663.jpg
uploadfromtaptalk1416636241304.jpg

Drilling my 90.

3/8" glass 35mm hole saw for a 3/4" bulkhead.

Took 3 hours total Including breaks. I was overly cautious considering I e chewed through 1/4" glass on smaller tanks in <20 min

Sent from my SCH-R950 using MonsterAquariaNetwork App
 

rodger

Polypterus
MFK Member
Apr 29, 2008
3,343
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Kansas City
uploadfromtaptalk1416650565215.jpg

3/4" glass, 3" hole. Damn thing took a full hour. By the time I was done the "saw" was pretty much shot.

Sent from my SCH-S960L using MonsterAquariaNetwork App
 
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