How to cut a circle?

[John]

I bought some quad copters the other day to sell, but I fancied one myself, anyway within 5 mins I had smashed it, I've broke some glass in it and I was going to cut out a bit of clear plastic using a compass cutter but by the time I've finished the circle it's not round, any ideas what would be the best thing to use?

[Guest]

John


How about making a template from masking tape. Do a rough cut then file down the rest doing a few test fits when you get close to finishing.


Just an idea

[John]

Thanks David, I used some thinner clear plastic and the compass cutter, managed to get it to fit but it must confuse the sensors, crash landed again


Back to the drawing board

[john i am]

Glass circle cutter 

[John]

Thanks John, it's a little too big, I've rang their tech support and they are trying to find me the part, it still works without it, I think it's more for keeping dust and dirt out

[monica]

there is a circle cutting compass  ,instead of a pencil it has a blade,

[Guest]

How about a clear tiddleywink?


Admittedly we don't know the diameter but I'm trying to think of things that might work :P

[John]

there is a circle cutting compass  ,instead of a pencil it has a blade,

That's what I was using. 

How about a clear tiddleywink?


Admittedly we don't know the diameter but I'm trying to think of things that might work :P

That is a great idea, but I haven't seen one since I was a kid. 


'I think there must be something special with the glass, the plastic didn't work. 

[Guest]

Try a watch glass google there are plenty in glass


Bob