plexiglass question
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Old 02-05-2014, 11:36 PM   #1
Ras
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plexiglass question


i have a piece of plexi glass and im trying to cut a square out of the edge so I dont have to slide the entire top off when I want to feed or clean etc



the red square is the part I need to cut , the blue is the parts I already cut for the intake/output of the filter

is it possible to cut out a square like that with just a plastic cutting tool? which is basically just a blade with a hook on it

i dont remember the thickness of the plexi glass but it is one of the thin ones from lowes, thats all I really know
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Old 02-05-2014, 11:39 PM   #2
Salmon McCloud
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With pliers or something like it and small bits at a time I think it's possible

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Old 02-05-2014, 11:54 PM   #3
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You wont be able to cut it with the cutting tool. You would need a dremel or a saw and try to cut it out
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Old 02-05-2014, 11:58 PM   #4
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Why not a circle. U can cut a hole with a hole saw and a low speed drill. Cut through a 2x4 first then clamp over the spot u want to drill. Use the 2x4 as a guide and slowly and I mean slowly cut ur hole. I've done this with 1\2 inch plexi .
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Old 02-06-2014, 04:19 PM   #5
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i would use a hack saw blade, (18T-24T) alone. that is to say not mounted on the tool,just the blade in hand.
a dremel even at the low speed may melt rather then cut.

if you have your hart set on cutting it like in the pic, (three cuts,centered)
drill a hole at the corners of your cut a 1/2-9/16 bit should do(before your first cut), large enough for the saw blade to fit in so you can make the back cut.



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Old 02-06-2014, 04:43 PM   #6
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If it's plexiglass and not polycarbonate, just cut the two vertical lines, score the horizontal line, and snap it off using a sharp table edge as a guide. Much easier than cutting all 3. The corner pieces can be scored and snapped too.
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Old 02-06-2014, 05:41 PM   #7
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That plexiglass will soon warp and won't fit over you aquarium anyway.

A piece of glass would be better suited for your purposes. You can break out a notch like you want by scoring the 'box' then tapping the back of the score lines with the score tool. Thin glass will break on the score lines without having to break it over an edge.
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Old 02-06-2014, 10:33 PM   #8
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I also think glass would be a better choice.

How big is your tank/lid? that front rectangle doesn't look like it would be big enough to do more then just feeding.
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Old 02-11-2014, 03:41 AM   #9
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38 gallon tank 36in long 15.5 wide
and you are right it is already warping, Id rather not get glass so how thick would acrylic need to be to not bend at 36in long 15.5 wide

there wont be any weight on it the lights are hanging, etc
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Old 02-11-2014, 10:39 PM   #10
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Thickness won't really matter, it will still warp.

You'd need to brace it by cementing pieces at a right angle - like 1" strips along the length and width of it.

I think a couple pieces of glass would be much easier- you could either hinge them (prefab hinge, or make a living hinge out of silicone), or just leave them unattached and move one piece as needed.

I've also seen designs where someone used a special type of molding/tile trim to make a sliding top that seemed to work pretty well, and look nice. I haven't been able to find the material used, but I haven't exactly looked very hard either...

Mind if I ask why you don't want to use glass?
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Old 02-11-2014, 11:34 PM   #11
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worried about it breaking and also sharp edges
it has to slide on and off of the top
only way to get around it sliding in and out of that groove is to cut a hole into the top so I wouldn't have to take the entire top off cwhen I needed to get in the tank
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Old 02-11-2014, 11:53 PM   #12
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Glass likely won't break unless you're being super careless or you like to stack bricks on top of your aquarium

Also, sharp edges on glass are very easily removed. You'll always be messing with plexiglass tops and will soon decide that glass is/was the way to go.
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Old 02-12-2014, 05:37 PM   #13
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Here is the link to the sliding glass tops: http://www.plantedtank.net/forums/sh...ad.php?t=42194
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Old 02-12-2014, 10:04 PM   #14
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Rider> Thanks, I didn't even realize I had seen that on this site...

As to worries about breaking, glass is stronger then we tend to think it is. The sharp edges are a concern, but it just takes a few passes with a sanding block to take the edge off - more if you want a nice squared or polished edge, but if safety is a concern, it doesn't take much.

You should easily be able to get a piece of glass that will fit in that slot in your trim, and cutting off the corners would be quite easy. not sure about the part in front - someone skilled in cutting glass could probably do it, but I don't think I could.

It looks like the slot is thick enough you might be able to fit two pieces in there, if you wanted to slide the top one back a bit for access to the tank.
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