Build a Low Speed Drill Press
These plans are for building a low speed drill press.
There's a secret to boring up to 1-in. diameter
holes through steel with a ½-in. capacity drill
press. You reduce the speed of the drill bit
and increase the torque with a speed-reducer.
When drilling through large and hard material, a lower speed drill press is often what you need. A high speed drill press requires more torque, and if you don't have torque to spare, these plans will convert your speed into more drill press torque to conquer harder jobs.
The speed-reducer is simply a jack-shaft consisting
of a mandrel with a 4-step cone pulley on
one end and a 12-in. pulley on the the other end
as in Fig. 1. This reduces the drill press chuck
speed to a low of about 125 rpm and a high of
about 600 rpm, depending on how the cone pulleys
How to Build a Low Speed Press
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