Cone cutters

[Andy™]

?? Oops arbour ?? Can you expand a little on this one please

basically uses the smaller (wrong) hole saw as a pilot for a larger one. you dont need a special arbour though, you can usually fit 2 holesaws onto a normal arbour. unless its 25-32

unfortunately, it doesnt work the other way around

 

[Sidewinder]

Bought a new hole punch today, have not been able to find my 25mm dia punch for a long time.

So I bought a QMax (good brand, & UK made) 25mm dia hole punch today for the job I was doing as I had to put a hole in the bottom of a panel board to take an SWA gland, the PB was about 6" off the floor, I was not sure if I could get a perpendicular hole with the drill to use a hole saw or how well I could get in with a cone/step drill.

Thus I got the punch so I could pop a dia 10.5 hole in the panel at an angle if necessary and then punch a nice clean hole for the CW gland.

Cost me less than

 

[professional]

If I install a new 3-phase board, I quite often drill extra 6mm holes in the top and bottom panels and insert pins/nuts. These holes can later act as pilots for larger size of Q-Max punches. Using this method you an start with a 6mm hole which is a pilot or a 10mm punch, which is then a pilot for larger punch etc. - and keep stepping up to a 73mm hole if required. Apart from the swarf from drilling the original 6mm hole, there is NO mess at all, and no burring.

They also do square punches for panel work.

 

[Sidewinder]

^Prof,

Not my original board mate!

I like the idea though if you can get your client to allow it.

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Oh & D shaped ones too for data plugs!