Metal Cutting Drill Bit

[cfherd]

Hi,

I am looking to cut a circular hole in a chrome electrical blanking plate but I am not sure of the correct bit to use in my drill.

The hole needs to be between 25-30mm so a regular drill bit won't be big enough to do the job.

This is probably a very easy question but thought best to ask the experts before I go an buy something expensive that won't work!

Thanks

Chris

 

[Diyisfun]

Metal Hole saw
http://www.toolbox.co.uk/hole-saws-3691-0000?gclid=CJ_Nu_XK0pwCFaAA4wodzyM8JQ

 

[regsmyth]

Or a cone cutter....
http://www.fix8.co.uk/products/Powe.../CC2440+24+to+40mm+HSS+Cone+Cutter/4240508223

 

[Deluks]

Bosch progressor with cobalt teeth. Excellent bits.

If it's just the one hole would probably be cheaper dropping it off at a local engineering firm, they'll probably do it for a fiver and would only take a few minutes.

 

[nickjb]

I'd go with a step drill. useful bit of kit and makes neat holes

eg:
http://www.mptools.co.uk/products.asp?partno=868874

 

[big-all]

free postage over £10
http://www.toolstation.com/shop/Pow...um+Coated+Step+Drill+2036mm/d80/sd1400/p88639

 

[RF Lighting]

If you want a really well finished hole, with no risk of swarf scratching the face plate, then a hole punch is your best bet, but it might be too expensive for a one off.

Clicky