Cutting Holes In Sheetmatal

[pepi]

(05-17-2016, 05:40 PM)DaveH Wrote: The way I have done it is to place the part to be cut on a thick piece of wood on the floor. Then stand on it (nicely)
Use an electric hand drill on the slowest rpm with a bit of cutting fluid and 'waggle' the drill in a slow circular motion. Slow and more slow.
The pitch of the teeth is fine - one tooth will travel 8'' along the metal in one revolution.

When I say the pitch of the teeth is fine, I don't mean the physical placement of the teeth is fine, I mean it will be fine to use.  
Although the pitch may seem coarse, the application it is being used for the pitch is OK.

 
DaveH

That's the way I have done it, slow speed is the key, folks run hole saws to fast. 

Another description of the drill motion, rock the drill in a slow circular motion.

If you spin a coin as it slows down it has a rocking motion.  As the coin is rotating only part of the coins circumference is in contact with the surface, that's the way the hole saw needs act.

Greg