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 AnonymousNewbie
Mad Scientist
Registered: 06/20/04
Posts: 211
Loc: England
Last seen: 6 years, 11 months
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 How can I drill holes in plexi glass?
#3442734 - 12/03/04 02:22 PM (7 years, 5 months ago) |
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I've been trying to cut a hole in plexi glass to insert a hose. The glass just cracks everytime I start drilling it...
-What should be done to cut this stuff?
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 agar
old hand
Registered: 11/20/04
Posts: 9,056
Loc: Somewhere Else
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Re: How can I drill holes in plexi glass? [Re: AnonymousNewbie]
#3442757 - 12/03/04 02:26 PM (7 years, 5 months ago) |
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USE A BRAND NEW = VERY SHARP BIT.
PLACE PLEX FLAT ON HARD WOOD SURFACE.
DRILL SLOW.
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blissedout
Registered: 11/11/04
Posts: 22,108
Loc: Yonder 
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Re: How can I drill holes in plexi glass? [Re: agar]
#3442765 - 12/03/04 02:28 PM (7 years, 5 months ago) |
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yeah, don't get in a rush cause you'll crack the piece
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woodzmun
listening tonature
Registered: 07/14/04
Posts: 341
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Re: How can I drill holes in plexi glass? [Re: blissedout]
#3442816 - 12/03/04 02:37 PM (7 years, 5 months ago) |
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Maybe some masking or duct tape down on the glass would help to prevent cracking. I would also go get a new titanium bit too, fairly inexpensive at the wallmart or autozone. And yes turn your drill speed down way down. Also don't apply to much pressure on the drill as you drill. The tape should keep the bit from sliding all over the place as the hole is started. Take agar's advice and make sure it is done on a solid surface too. GL
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tripndicular
My Minds Eye IsRhizomorphic
Registered: 08/25/02
Posts: 2,791
Loc: Bowels of HELL
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Re: How can I drill holes in plexi glass? [Re: AnonymousNewbie]
#3442836 - 12/03/04 02:42 PM (7 years, 5 months ago) |
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A good sharp bit , and do not bear down full force , let the bit start to cut into the plexi , then put full presure to fifnish cut .
Most if not all hardware stores\Home Depot\Lowes will cut it to size if you ask them , mkae sure you have dimensions correct though .
PS when you get sick of that plexi lid warping , go LEXAN you'l will be much happier . 
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Prisoner#1
Even Dumber ThanAdvertized!
Registered: 01/22/03
Posts: 152,598
Loc: Pvt. Pubfag NutSuck
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Re: How can I drill holes in plexi glass? [Re: AnonymousNewbie]
#3442849 - 12/03/04 02:45 PM (7 years, 5 months ago) |
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the best thing I have ever found for drilling into acrylics and plastics
brad point drill bits, the center point gives you a pilot to follow, the
extended cutting edges will score the plastic giving it no where to
begin a fracture, back the plastic with a piece of wood and once the point
starts to penetrate, turn the plastic over and start from the other side
do not allow them to go all the way through from the first drilling side
and use a slow speed roughly 300rpms
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eric_the_red
Registered: 02/28/03
Posts: 12,778
Loc: happy land
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Re: How can I drill holes in plexi glass? [Re: AnonymousNewbie]
#3442870 - 12/03/04 02:49 PM (7 years, 5 months ago) |
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it might help to soak it in the hottest water you can get in your bathtub for about 15 mins, then start drilling.
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TonyMontana
Montana RealtyCompany
Registered: 09/22/02
Posts: 120
Last seen: 3 years, 11 months
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Re: How can I drill holes in plexi glass? [Re: eric_the_red]
#3442944 - 12/03/04 03:08 PM (7 years, 5 months ago) |
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Also, start with the smallest bit you have. Then, keep going over the whole with larger and larger bits until you've got it the size you want.
And let me remind you one more time to go SLOW. 
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Chilon
Stranger
Registered: 11/29/04
Posts: 36
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Re: How can I drill holes in plexi glass? [Re: TonyMontana]
#3443060 - 12/03/04 03:41 PM (7 years, 5 months ago) |
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I like those bits pris#1 I bet those would do the trick. Self starting would work the best.
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Prisoner#1
Even Dumber ThanAdvertized!
Registered: 01/22/03
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Re: How can I drill holes in plexi glass? [Re: Chilon]
#3443153 - 12/03/04 04:20 PM (7 years, 5 months ago) |
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they have always worked for me and a set at home depot is only about $14
the singles are from about $2 to $12 depending on the size
remember, brad point drill bit.
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MadHatR
journeyman
Registered: 10/13/03
Posts: 253
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Re: How can I drill holes in plexi glass? [Re: Chilon]
#3443158 - 12/03/04 04:23 PM (7 years, 5 months ago) |
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This also depends on the size of the hole he is cutting. If attaching something like a garden hose you would be better off using a saw blade after drilling a small pilot hole, or even just a bunch of small holes to form a circle of the correct size. With most plastics heat works best to avoid cracking, like a hot knife on the clear hard plastic of a rubbermaid tub, but with plexi glass you should avoid heat. Heat like that caused by the friction of a high speed drill bit will cause it to bind, then when you try to force through that binding it will crack. That is why it is normally scored and snapped. Drilling or even a jigsaw can be used on it as long as it is not moving at a high rate of speed and you take breaks so heat is not built up.
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Prisoner#1
Even Dumber ThanAdvertized!
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Re: How can I drill holes in plexi glass? [Re: MadHatR]
#3443196 - 12/03/04 04:32 PM (7 years, 5 months ago) |
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Quote:
MadHatR said:
This also depends on the size of the hole he is cutting.
for larger holes a forstner bit is suitable, again at a low speed to prevent
the plastic thats being cut away from melting and binding the bit
a little oil will do even more. also keep in mind that certain
plastics dont do well with heat, others are designed for high
heat and impact resistance... one example is polymethylpentene
also called lexan.
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MycoChode
Stranger
Registered: 10/26/04
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Re: How can I drill holes in plexi glass? [Re: Prisoner#1]
#3444057 - 12/03/04 09:28 PM (7 years, 5 months ago) |
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I use a UniBit at work all the time. works real good on acrylic. Is acrylic the same as lexan? I think it is.
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shroom24
Shroom24
Registered: 11/30/10
Posts: 6
Last seen: 1 year, 1 month
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Hi
I used a soldering Iron and just melted my holes no cracking at all hope this helps !!!!
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Doc_T
Random Dude
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Re: How can I drill holes in plexi glass? [Re: shroom24]
#13603129 - 12/08/10 05:25 PM (1 year, 5 months ago) |
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Hi, this thread is old enough to be in school.
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shroom24
Shroom24
Registered: 11/30/10
Posts: 6
Last seen: 1 year, 1 month
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Re: How can I drill holes in plexi glass? [Re: Doc_T]
#13603147 - 12/08/10 05:28 PM (1 year, 5 months ago) |
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Does it matter people still read it
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Disgruntled
Registered: 10/24/10
Posts: 444
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Re: How can I drill holes in plexi glass? [Re: Doc_T]
#13603155 - 12/08/10 05:30 PM (1 year, 5 months ago) |
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lol,. yeah its alittle late for the most part
eh, yes and no. i say yes it matters because there are prob 20 other threads a little newer and more relevent on the matter then this one,. and then i say no it dont matter, cause as you said. some people read the old threads. and it dont really hurt with all the same type threads posted to have an old one roll through
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Barakanaten
Man in a petri dish
Registered: 04/14/10
Posts: 5,963
Loc: PNW Mycosphere
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Re: How can I drill holes in plexi glass? [Re: Disgruntled]
#13603197 - 12/08/10 05:38 PM (1 year, 5 months ago) |
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Mr Mycoman
Myconut
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Re: How can I drill holes in plexi glass? [Re: Barakanaten]
#13603266 - 12/08/10 05:57 PM (1 year, 5 months ago) |
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Unibit or Plastidrill, which is made for plastic. They just take a grinder and grind the outside edge of each of the two cutting planes. It is these corners that cause the plastic to crack. If the corner is filed down it won't crack, that is why Unibits work......MM
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sporesmores420
SillyPsybin
Registered: 06/01/10
Posts: 798
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Re: How can I drill holes in plexi glass? [Re: Barakanaten]
#13603309 - 12/08/10 06:07 PM (1 year, 5 months ago) |
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you could get a diamond bit then youll be able to drill thru anything
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