05-17-2016, 08:46 PM
(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
+1 on Dave's approach. The slower the better. I'd put it on the drill press, make sure everything is firmly attached to the table, turn the variable speed pulley down as far as it would go ... about 150 rpm i think ... then turn the vfd way down. Light presure,some lube and patience.
Having put a number of 4.5 inch speaker holes in car door panels the excitement usually occurs when one side breaks thru, with the key being to not let the teeth catch on the breakthru edge.