Orpington Astronomical Society

Astronomy => Technical => Topic started by: Carole on Nov 09, 2009, 12:45:35

Title: Cutting plexi glass
Post by: Carole on Nov 09, 2009, 12:45:35
What's the right tool for cutting plexi glass?
Mine has arrived, it is the right length but they didn't cut the height down and it's too big.

Not sure whether I will have the right tool, my husband is not sure and really only has tools for doing carpentry. 

I sent a message to Mick but not sure if I have the right E mail address for him.

Carole
Title: Re: Cutting plexi glass
Post by: mickw on Nov 09, 2009, 12:56:51
Sent email  8)
Title: Re: Cutting plexi glass
Post by: Ian on Nov 09, 2009, 13:11:59
I'm sure Mick's sent you the same answer, but just for anyone else wondering about cutting plexiglass.

The answer is, with a hacksaw, but *slowly*. The plexiglass will melt at the cut if you go too fast, and that will clog the blade up with sticky lumps of plastic, and you'll get a very rough edge from the cut.

It's worth bearing in mind, it's easier to cut the plexiglass down to size than cut the laptop screen down to size...
Title: Re: Cutting plexi glass
Post by: Mike on Nov 09, 2009, 14:12:11
I've used an electric jigsaw successfully, in fact all the sheets i cut for the society members were done using a B&D Jigsaw. You just need to do it slowly and carefully and apply minimum pressure. be patient whilst cutting.
Title: Re: Cutting plexi glass
Post by: Carole on Nov 09, 2009, 14:39:55
Thanks every-one, it's worth knowing, our hacksaw it pretty ropey and slightly bent, so Mick has kindly said he would do it for me.

Carole
Title: Re: Cutting plexi glass
Post by: Ian on Nov 09, 2009, 15:57:53
that's not a nice way to talk about mick.

Well, maybe he's a bit ropey... ;)
Title: Re: Cutting plexi glass
Post by: Jim on Nov 09, 2009, 16:37:59
Carole

I don't know about plexi glass but when I cut Perspex you have to make sure the surface is taped (I use duct tape) on both sides so you cut through the tape.
Title: Re: Cutting plexi glass
Post by: mickw on Nov 09, 2009, 17:35:16
Any fine toothed (sharp) blade - slowly to allow the "bits" to cool and fall away, otherwise they will melt together behind the blade (especially with power tools) and basically weld both bits together again  :(

Tape on either side helps to hold the material surface together and prevent chipping.  With a little care and determination you can override this precaution and send acrylic shrapnel in all directions  :lol:

Something I learnt recently -

Acrylic - Perspex or Plexiglas
Fairly scratch resistant, fairly UV resistant, prone to shatter

Polycarbonate - Lexan
Not scratch resistant, not very UV resistant (goes cloudy after time), fairly flexible, does not shatter - Cheaper than Acrylic  ;)