Re: [CAD_CAM_EDM_DRO] Re: Sherline Problem

You only need one pulse for threading. This is well established.
I recommend putting another type of phototransistor on the spindle, a
reflective one.
Then paint one small reflective stripe on the spindle.

Many have done this with great results.
I did this, changin one phototransistor (for a slotted disc like yours)
for another.
I put a piece of aluminum foil on thespindle with tape, works fine.
Cost 11 € for a single ir phototransistor, locally. Qty prices are 1-3
$. Worked the same day.

What electronics are you using to connect the spindle index pulse to
your pc ?

I may have an part number. There are many options, it was really much
easier than I thought.
h.

>
> In a message dated 11/7/2007 11:55:54 A.M. Mountain Standard Time,
> hvenermo@... <mailto:hvenermo%40amorco.com> writes:
>
> Use a left-handed drill to drill it out ?
>
> *
> *
> *
>
> I have used left hand drills for a long time, but they have trouble with
> the hardened set screws. If the set screw is broken sometimes they
> will catch
> on the cracks on the top, but in this case there are no cracks.
>
> I was going to take it off, so I could mount a disc on the side for
> putting
> out the pulse that Mach needs for threading.
> So I am now looking at other options so I can just forget the set
> screw is
> there.
> bill
>