Which drill bits for Acrylic sheet please ? (1 Viewer)

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meanders

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Drill speed is crucial. Almost as slow as you can take it. Higher speed will melt it, jam the drill then crack it. I prefer an old fashioned hand drill if drilling hard plastics.

If cutting a large hole with a rotary cutter, make sure it's flat and really well supported. Start from one side and go roughly half way, then flip it over to finish. Be very careful at the point it starts to break through as it will snatch.

Or approach your local school/college to see if they have a flat bed laser cutter that they will cut them for you for a decent donation. The finished holes are superb.
 
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I'd be worried about cracks starting from the edge of the holes. I suspect it's going to be important to make sure the fixings don't cause stress at the edge of the holes when you put it in place.

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TheBig1

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Always use a new very sharp HSS bit for small holes v-e-r-y s-l-o-w-l-y

Always support the sheet from behind to prevent flexing and control break through

The other option in some cases is to heat a piece of metal tube and use that to carefully melt through the plastic, but it can result in raised edges around the hole that will need to be sanded flat
 
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!I HAVE NEVER TRIED THIS!
But I wonder if a wood bit might do the trick, becouse it has a blade at the outside edge it might score the outside edge of the hole stopping any cracking.

As I said I have never tried it so experiment on an offcut first.

Whatever drill you use make sure it is sharp, and let the drill do the work dont force it.
 
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If possible reshape a hss metal drill from the 60° angle to 120° and set you drill to a slow speed, support the workpiece and don't push too hard.
Dependant on what the hole will be used for if as a securing method ensure the hole you drill is a good clearance fit for the fastener.
 

Stealaway

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I always used to use one of these on my race bike fairing screens- See if you can borrow one

Small lathe centre drill

s-l500 (1).jpg

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Feb 27, 2011
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Thanks Everyone.

Now I just need to know what Glue to use.

Aluminium - Acrylic

Depends...

If the join won't be visible once done, I would recommend looking at 3M VHB tape.

Outside that, too many options depending on the applications. outdoors. indoors. ultra violet protection required? Temperature sensitive zone? etc etc.
 

TheBig1

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This is what racing teams use to bond in screens for rally and race cars. Very similar to that used with glass screens but formulated specifically for acrylic sheet and perspex
 
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Depends...

If the join won't be visible once done, I would recommend looking at 3M VHB tape.

Outside that, too many options depending on the applications. outdoors. indoors. ultra violet protection required? Temperature sensitive zone? etc etc.
Motorhome window, visible. So UV and Temperature change

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Feb 27, 2011
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Motorhome window, visible. So UV and Temperature change
Please let use know which adhesive you end up using and how well it works.
With alumunium and plastic having different coefficients of expansion I am curious as to what would work and survive UV and temp changes like that.
 
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Please let use know which adhesive you end up using and how well it works.
With alumunium and plastic having different coefficients of expansion I am curious as to what would work and survive UV and temp changes like that.

What about windscreen sealant, that has to withstand lots of stresses and temperature change? Cross someone's hand with silver, he might get some? :giggle:

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Derek’soldvan

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!I HAVE NEVER TRIED THIS!
But I wonder if a wood bit might do the trick, becouse it has a blade at the outside edge it might score the outside edge of the hole stopping any cracking.

As I said I have never tried it so experiment on an offcut first.

Whatever drill you use make sure it is sharp, and let the drill do the work dont force it.
I commissioned a sculpture made of acrylic sheets a while back, they used wood bits & wood cutting bits, masked up both sides to prevent jarring & breakouts
 

TheBig1

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What about windscreen sealant, that has to withstand lots of stresses and temperature change? Cross someone's hand with silver, he might get some? :giggle:
The window fitting sealant I linked to is designed for the purpose as some sealants will react with the acrylic. I know the likes of autoglass use a mastic to fit temporary screens. Both to aid removal when fitting the glass one and because it does not fog the acrylic. I drove round with a temporary screen in the back of my pickup truck when some scrote smashed it and it was in for 2 months without coming loose or leaking, but it was easy to pull out.

The stuff the rally teams use is super strong and needs cutting out with a blade
 
Feb 19, 2018
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The window fitting sealant I linked to is designed for the purpose as some sealants will react with the acrylic. I know the likes of autoglass use a mastic to fit temporary screens. Both to aid removal when fitting the glass one and because it does not fog the acrylic. I drove round with a temporary screen in the back of my pickup truck when some scrote smashed it and it was in for 2 months without coming loose or leaking, but it was easy to pull out.

The stuff the rally teams use is super strong and needs cutting out with a blade
As you probably know, a lot of Passenger Coach windows & windscreen these days are permanently bonded against the body with a sealant, the one I blagged and used on some of my Coaches is made by Dupont and is called BETASEAL 1580. This is the stuff I wrote about.

As you say, this also has to be cut out with a blade.

IF this is suitable for acrylic, I have no idea but I thought I would mention it to be investigated as an alternative?
 
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Pick the brains of FT in tias i always do when over in Lanzarote so trythere local branch near you
 
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