Re: [SherlineCNC] small taps and dies
- There are a lot of micro drills that come with 1/8, 1/16, or 1mm shanks.
Most of the industreal tool supply companies carry them.
On a manual machine I like to use the wrench / chuck key (the handle of most
chuck keys will fit the hole in the chuck) on the chuck and put a light
downward force using the quil handle. On machines like the Sherline, I've
also taken the belt off and used the pully as a tap handle. Thread milling
might be an option, but I've never tried it on a hole that size and don't
know if they make them that small. Mostly on cnc holes that small I just
drill the hole then use a tapping block (block with a hole the size of the
tap od, to hold it straight) to tap it later.
From: "Scott Meyer" <baldysm@...>
> 1. I am looking for sources of tap drills that have an 1/8" shaft. Endmills
> would work do if they are the right size.
> 2. How would you tap on the mill with these size taps? Sensitive drilling
> attachment and spinning by hand using the standard motor head?
> 3. Is there a way to tap using the air tool spindle? I don't see a way,
> maybe someone else has thought of a way.
- --- In SherlineCNC@yahoogroups.com, Ron Ginger <ronginger@...> wrote:
>I bought one from Enco:
> Make a crank handle to attach to your motor pulley.
Bore out the aluminum plug and add a set screw, or mill a pocket to
pick up the screw you put in the side of the lathe shaft for the
threading attachment. I did both. At 3" diameter this clears the motor
on either lathe or mill. You could also use this if you made a tapping
Pretty good stretch for less than 10 bucks.
- You are on the right track to look for ways to hold the tap in the
machine- I have never broken one held by a spindle, I have broken my
Make a crank handle to attach to your motor pulley. If you have the
threading attachment its handle might work. Otherwise a simple handle
with a tapered plug on its end, to fit inside the spindle bore and
tighten with a nut. I made such a crank for my 11x48 lathe and use it
often for things like big taps and spring winding. Anytime you want slow
and controlled spindle rotation.