"For the little lathe... it works just fine so I'll leave it alone and
start working on adding x and Z motors on my newly acquired Monarch 10ee.

Before I start getting rotten tomatoes thrown at me for doing such a
travesty I must note that this machine is what is called a "base"
model. it left the factory with no lead screw, no change gears and no
way to add them back even in the unlikely event that I could find
them.  There is also no taper attachment.  So why would I ever buy
such a machine??? I didn't.  It was a gift.   I've sunk about $200
into a rotary converter with idler(no need for variable speed) and I
think I can add a ball screw and servo to
the Z and a servo to the x for less than $400.  Must look into Mesa
servo drives."

Cecil


no the tomatoes are for scoring this retrofitable king of machines :)


On Thu, Apr 4, 2013 at 10:52 PM, Cecil Thomas <wctho...@chartertn.net>wrote:

> I have recently converted a jet 9x20 to CNC using gearhead servos on
> the x and z and a treadmill motor on the spindle.  I made my spindle
> encoder out of a CD with 20 notches with one deeper than the rest.  I
> read the counts with active electronic optical interrupters so the
> output is clean and full voltage.  I have A, B and Z encoders so I
> get 80 counts per rev which I think is plenty good enough and doesn't
> cause crazy high count rates at high spindle speeds.
>   I control the spindle speed with PWM through another optical
> interrupter for isolation.  I actually do my threading with g33
> because it was so easy to rewrite my threading programs from servo
> spindle to indexed spindle.  I am very comfortable with my threading
> program because it works referenced to the outer diameter of the
> stock or the inner diameter of an internal thread which is the way I
> think.  Also since it's my code I can modify it any time for any reason.
>
> For the little lathe... it works just fine so I'll leave it alone and
> start working on adding x and Z motors on my newly acquired Monarch 10ee.
>
> Before I start getting rotten tomatoes thrown at me for doing such a
> travesty I must note that this machine is what is called a "base"
> model. it left the factory with no lead screw, no change gears and no
> way to add them back even in the unlikely event that I could find
> them.  There is also no taper attachment.  So why would I ever buy
> such a machine??? I didn't.  It was a gift.   I've sunk about $200
> into a rotary converter with idler(no need for variable speed) and I
> think I can add a ball screw and servo to
> the Z and a servo to the x for less than $400.  Must look into Mesa
> servo drives.
>
> Cecil
>
>  >You can probably add an index to the spindle and set up for G76 etc.
>  >The motor encoder and belt ratio will give an unusual number of counts
>  >per rev, but it's just a number and computers don't care.
>  >However, you do need one index per _spindle_ rev to do G76 threading.
>
>
>
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-- 
jeremy youngs
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