1 3/4" holes in 3/8" glass...

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zennzzo

Feeder Fish
MFK Member
Oct 18, 2005
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Mile High in Northern AZ, baby!~
So I'm on E-bay, and I see these 1" Bulkheads for under 2 dollars each. It said they require a 1 3/4" hole to mount. So after some simple math, I decided they wern't junk. They had to be close to a 1/4" thick, so they can't be flilmsy...


Three days later, in my mailbox they arrived. Just as ordered, I got 2 very nice, inexpensive bulkheads. $8.18 shipped for 2 of them...

OK so now I'm looking for a 1 3/4" diamond hole saw, I see them on E-bay for a really cheap price from a dude in HongKong. After scanning the transit time, 6-10 days, I figured I'd wait and see what my other options were...

I got out my trusty Dremel, and chucked up a Diamond bit...
Now looking at the tiny chip on the edge of my tank, I knew the side glass wasn't temperd. I made a jig so I could grind without any stray, runaway scratches and it made for a place for the cooling water to pool. The trick to using diamond tipped bits, is to keep them wet. It cools the bit as well as keeps the diamond grit free from glass dust...

15-20 minutes later, I had this plug of 3/8" glass and a perfect 1 3/4" hole in the glass.
The second hole took less time, pobably about 10-15 minutes, because I knew how fast I could remove material without smoking the bit.
Once you see a glow of red sparks between the bit and the glass, it's over. The bit is ruined, smoked, all done, no good anymore.

Gotta love it when a plan comes through...

1 inch bulkheads.jpg

start1.JPG

hogbit.JPG

gig.JPG

grind 5 mins.JPG

cut out.JPG

complete hole.JPG

installed bulkhead.JPG

overflow.JPG
 
Actually I got my bits from the guy in Hong Kong. The shipping didn't take all that long and the quality of the drills is top notch. I have no idea how many holes I have drilled so far but the one I have been using still looks brand new.

Maybe post some pics of the jig you made so others will know how to duplicate it. You do good work.

Also, another thing to point out is to keep the bit on a low speed. It helps control the heat build up. When the bit gets hot, the diamonds release and fall out. No diamonds = no cutting.
 
good job bro

mike
 
Thankz...
For a jig, I used an old cutting board and a regular holesaw intended for wood/metal to make a hole in it.
The nature of the teflon cutting board makes for a good bearing surface for the smooth part of the dremel bit.
It was held in place by some gray plumbers putty...

gig setup.JPG
 
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