On Tue, 10 Aug 2021, andrew beck wrote:
Date: Tue, 10 Aug 2021 14:31:22 +1200
From: andrew beck <[email protected]>
Reply-To: "Enhanced Machine Controller (EMC)"
<[email protected]>
To: "Enhanced Machine Controller (EMC)" <[email protected]>
Subject: Re: [Emc-users] Just a little rigid Tapping Clip. With peck tapping
Andy can you think of any good ways to change acceleration on the fly?
If you are using the limit2 component, changing Spindle accelration
is just a matter of changing the limit2.N.maxv value on the fly
A bang-bang way to do this would be to feed the absolute value of the spindle
speed into the compare comp and use the compare components output to select
between 2 accelleration settings (with a mux2 component)
A more elegant way might be to use the lincurve component to map spindle
velocitys into acceptable accelerations
I could call a custom m code in my post processor if I had to.
Or is it possible to increase the deceleration if under 1000rpm? Currently
my spindle acceleration is running through a limit component
On Tue, Aug 10, 2021, 1:45 PM John Dammeyer <[email protected]> wrote:
I agree it would be nice to change acceleration on the fly based on the
G-Code. The AC Servo on the spindle responds really quickly so fast
acceleration is really fast. Great for the tapping. Annoying otherwise.
John
-----Original Message-----
From: andrew beck [mailto:[email protected]]
Sent: August-09-21 5:17 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Just a little rigid Tapping Clip. With peck
tapping
Quick answer before I go out.
Peck Tapping breaks the chip otherwise they can break taps. Eg tap m6
down
30mm you might break it. But do it in two bites you should be sweet
and rpm is 400.
If I somehow work out how to know if g33.1 (rigid Tapping is active) and
export that to a python script. Then I can change my spindle acceralation
briefly and tap at 1000rpm with almost no over shoot. The spindle Vfd
can
reverse in 120degrees currently at 1500rpm
But that will take some coding I think.
I can change acceralation on the fly with custom m codes and halcmd
currently but need to to set it up to automatically change back and forth
if rigid Tapping is active
On Tue, Aug 10, 2021, 11:50 AM John Dammeyer <[email protected]>
wrote:
Impressive. Lots of questions.
Why did you make two passes? Just because? Seems like the spirals
could
get caught and muck up the threads on the second pass.
Was this steel or aluminium?
What type of coolant are you using?
Do you have an oil separator disk or belt and aeration to keep it from
getting smelly?
I did my 10-32 tapping at 150 RPM. Still scary how fast it moves up
and
down.
John
-----Original Message-----
From: andrew beck [mailto:[email protected]]
Sent: August-09-21 1:20 PM
To: Enhanced Machine Controller (EMC)
Subject: [Emc-users] Just a little rigid Tapping Clip. With peck
tapping
M14x2 spiral flute tap.
Rpm 400
Pecking 15mm.total depth 35
I can turn main power off at the wall and it will re line up with
tapped
threads so long as I leave it in the vice.
That's so cool. Love linuxcnc
Might try a m20 tap sometime. I have 7.5kw spindle. Be interesting
to
see
if it can push it lol
https://youtu.be/6QX2Qm3I2Ak
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Peter Wallace
Mesa Electronics
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