My X infeed per pass is based on a constant area calculation where
obviously the depth of the very first pass dictates the area of the
first cut and therefore subsequent cuts.
When commencing an Auto Thread sequence the operator either accepts
the default first pass depth for that pitch of thread or adjusts it
to a value appropriate to the material and tool. When the cycle runs
each subsequent pass depth increment reduces (by calculation) to
ensure the constant area. Limits have previously been set for Z. A
cutting pass will end at the Z end limit and after X is retracted
the carriage will then return to the Z start limit.
If the system is set to cut on the flank, having calculated the
required total depth for a pass a Z increment is calculated by
multiplying that pass depth by 0.566. At the start of a pass Z is
moved by this amount and X is moved into depth. Once these moves
finish the Z axis then starts its threading move on the zero count
of the encoder.
I did not think it was "clever" but maybe I am missing something?
Richard
On 19/10/2020 09:10, John Dammeyer
wrote:
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Well
if you are following the hypotenuse of the 28.5 degree
triangle then for each pass X is a bit deeper and Z is
closer to the headstock if the thread is cut towards the
headstock.? Simple
trig.
?
But
if you keep the Z starting position the same then to start
the cut a bit further along the thread the spindle has to
rotate a different amount while the Z axis motor is
accelerating so the tool enters the work over by that Z
amount.
?
So
I'm curious how your system tracks the flank of the thread.
?
John
?
?
Wow
John you have got me worried now! I did not think that it
was "clever math" so I had better go back and check what I
did.
Richard
On 18/10/2020 17:30, John Dammeyer wrote:
Hi Ralph,
So you have written
the 'clever math' to do this.? Super.? Looking forward to a
detailed explanation on how you've done that.
John
?
?
?
Actually John I think that Ralph was
directing the question to John Lindo!
Further to the comment you made that I repeat below, sorry
John you are incorrect. I am using the Russian ELS on on
Arduino Mega and I have "modified" the software. I have
constant area cutting and the operator can pick plunge or
flank cutting. After reaching the calculated depth for the
Metric or Imperial thread further passes are possible at
increments chosen by the operator. I also have the
capability of clearing the tool away from the job? in X
for testing then subsequently moving it back to the
original position if further cuts are needed. As the
system is encoder controlled the speed can vary whilst
cutting.
Richard
On 17/10/2020 23:31, John Dammeyer wrote:
?
Unless the math
is really clever on the Arduino based electronic gearing
systems they can't do it either.
?
?
?
?
