Re: Encoder resolution

Dennis,

The Microkinetics Software Package(s) all use their Instep motion
library, which is available as a separate product(requires you to
use/buy their PCcard, though!). This library contains the code to
carry out all the requests for motion needed by the motion
application.

For those familiar with EMC, these are the equivalent of the
canonical functions.

The library procedure isThreader performs threading in microkinetics
software.

Description(from the docs) "Threader allows you to perform externally
synchronized... moves in which the external pulses are interpolated
with the steps of the move. By attaching an encoder... the Threader
command can be used to lock up to 4 axes to the incoming signal."

So what is happening is: for a given number of pulses from the
encoder, the motor(x axis in our lathe example)will step a certain
number of steps. It is the RATIO of the (spindle)encoder steps to the
(X axis)/motor steps which create the thread.

Note that if we include steps to move the Z axis, we will get tapered
threads.

Ballendo

P.S.
Someone mentioned using mill software to drive a lathe. Piece of cake
as long as threading is not involved. Swap the axis cables at the
drivers so x feeds the x motor,y feeds the z motor, and leave z
disconnected or disabled. Draw the bottom half (as shown on the
screen)of the part outline, including any roughing passes. If you set
part/program zero to the centerline of the part, your displays will
read the current RADIUS of the part. BE CAREFUL OF MOVES TO 0,0!,
they will try to cut to the lathe centerline!!!

P.S.S. For those unfamiliar with lathes, the Z axis carries the tool
in and out from the center(making different diameters) and the X axis
moves the tool left and right along the workpiece. Y (very seldom
used) raises and lowers the tool height (in relation to the spindle
centerline)