Great bit for drilling plastic

I picked up a Unibit #3 last weekend, and it does such a great job making holes in my tubs that I thought I'd share.

It cuts larger and larger holes in steps as the bit moves in, without cracking the plastic. I won't be melting holes in tubs ever again.

http://www.amazon.com/Irwin-10233-Un.../dp/B00004THYZ

Been using a unibit for years, it is a handy-Jim-dandy tool to have. But I still use a soldering iron for making holes in tubs, it's faster and less mess.

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Originally Posted by llovelace

Been using a unibit for years, it is a handy-Jim-dandy tool to have. But I still use a soldering iron for making holes in tubs, it's faster and less mess.

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And who doesn't love that burning plastic smell....mmmm mmm good lol

I never thought about using a step bit on plastic tubs. You can get a better price at Harbor Freight. http://www.harborfreight.com/cpi/cta...emnumber=91616

not to change the subject how about drilling in to plexi with out crackin it

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Originally Posted by zombie&lemons

not to change the subject how about drilling in to plexi with out crackin it

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Put a board under it so it doesn't have any give, and you can drill right through into the wood without cracking the plexiglass. Just start small or use one of these bits.

Thanks for the tip Jeff. I will need to give it a try.

As far as drilling acrylic, I use a bit that has been reground to a tip angle of 60 degrees versus the standard 120.

http://www.plasticsmag.com/features....sue=Sep/Oct-01

Your best bet though is to buy a bit specifically for acrylics. I use these also and find they work the best. I found these with a quick Google search.

http://www.rplastics.com/plasticdrill.html

Yeah but they're made in China.

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Originally Posted by dsirkle

I never thought about using a step bit on plastic tubs. You can get a better price at Harbor Freight. http://www.harborfreight.com/cpi/cta...emnumber=91616

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Originally Posted by 2kdime

Yeah but they're made in China.

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most of them are not made here thanks to free trade

I ordered that bit in a 3 piece set for 32$ off ebay with free shipping, used it tonight....worked great. was waaaaaay fast, and cleanest holes I ever make in plastic. I drilled a few holes in a entire rack today, took 10 minutes to do the entire rack.:gj: Thanks for the tip.

Thanks for sharing the info Jeff. :gj:
We've been using uni-bits for drilling holes in our plastic tubs for a few years now. It definitely does a great job with absolutely no cracking.

You can just use a very sharp drill bit, High speed low pressure with a board under it = no cracking.