Well, I finally got to test out the rigid tapping on real material, and
it works great!
I did 96 2-56 holes. Since it was thick material, I couldn't use the
combined drill-taps,
they are rated for 2 X the major diameter, and will do a little more if
you are careful.
You have to drill at a low
On Thu, 29 Apr 2010 23:33 -0500, Jon Elson el...@pico-systems.com
wrote:
My first cut at rigid tapping just jammed the VFD from forward to
reverse command, which was so abrupt it caused Z-axis following errors
at higher spindle speeds. I have a lowpass component in there also to
make
On Fri, 2010-04-30 at 10:42 -0400, John Kasunich wrote:
... snip
2) Most VFDs let you set a ramp rate as a configuration parameter, so
you don't need either the lowpass or the limit block in HAL.
... snip
Being able to set the ramp for different operations would be nice, maybe
in g-code?
--
John Kasunich wrote:
1) The lowpass component generates an exponential response, with the
speed
changing rapidly at the beginning of the transition and slowly at the
end.
If you use a limit2 block, the speed ramp rate will be constant.
Yes, I am aware of this, it was pointed out to me after I
Kirk Wallace wrote:
Being able to set the ramp for different operations would be nice, maybe
in g-code?
Is there a way to set an arbitrary HAL parameter from G-code? I guess
with macros you can do it.
Jon
--
On Fri, 30 Apr 2010 11:00 -0500, Jon Elson el...@pico-systems.com
wrote:
Kirk Wallace wrote:
Being able to set the ramp for different operations would be nice, maybe
in g-code?
Is there a way to set an arbitrary HAL parameter from G-code? I guess
with macros you can do it.
The
On 30 April 2010 20:28, John Kasunich jmkasun...@fastmail.fm wrote:
The only way I know of would be with a custom M1xx code. It
would invoke a script that does helcmd setp the-param the-value
It seems odd that we can read DIO, write DIO and write AIO. There is
an asymmetry there.
Would it be
John Kasunich wrote:
The only way I know of would be with a custom M1xx code. It
would invoke a script that does helcmd setp the-param the-value
The value could come from a g-code and be passed to M1xx as a P or
Q word. I don't see any way to pass the name though - each M1xx
command would
I have wired up one of the PPMC DAC channels to control the VFD, and
added an abs HAL component to get the unipolar spindle speed command.
My first cut at rigid tapping just jammed the VFD from forward to
reverse command, which was so abrupt it caused Z-axis following errors
at higher spindle
On 23 April 2010 04:00, Jon Elson el...@pico-systems.com wrote:
Andy Pugh wrote:
... with closed-loop spindle control you will automatically get the
spindle speed you ask for in the G-code regardless of which pulley and
back-gear combination you have selected,
I understand the concept, but
Andy Pugh wrote:
As for speed signal noise, my speed signal is fairly random, (it is a
home-made encoder ring with slot-sensors) but using the right PID
values seems to filter that effect adequately.
Well, I guess I will have to try this out.
I have just thought of another way of doing the
- Original Message -
From: Jon Elson el...@pico-systems.com
To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Sent: Friday, April 23, 2010 11:23 AM
Subject: Re: [Emc-users] Bridgeport spindle encoder
Andy Pugh wrote:
As for speed signal noise, my speed signal
RogerN wrote:
I use speed feedback on my lathe, filtered it using existing Hal functions.
On threading my counter gets reset (spindle encoder) and would be an
enormous negative speed, I limited the rate of change of speed to be
realistic, I don't allow it to go from 800rpm forward to
On 22 April 2010 04:16, Jon Elson el...@pico-systems.com wrote:
I have 8 gears, really 4 belt positions and direct-drive or
back-gear. I've been thinking of putting a microswitch on the backgear
handle and some long-distance photo detectors to sense the belt
position. Then this would feed
Andy Pugh wrote:
Thing is, once you are doing that HAL-fiddling you might as well just
be running closed loop on the spindle speed which also automatically
increases the slip speed as the load increases.
I've had a tach on my Bridgeport for some time. I have noticed a drop
of about 3 RPM
On 22 April 2010 17:19, Jon Elson el...@pico-systems.com wrote:
Andy Pugh wrote:
Thing is, once you are doing that HAL-fiddling you might as well just
be running closed loop on the spindle speed
I've had a tach on my Bridgeport for some time. I have noticed a drop
of about 3 RPM under
Andy Pugh wrote:
[snip]
And this was only ever meant to be a throwaway comment aimed at the
earlier statement that an encoder with no index is no use at all. ie
that you can still use such an encoder to control and measure spindle
speed.
I think Jon's original comment was meant to say
Andy Pugh wrote:
I seem to be failing to express myself clearly. What I am saying is
that with closed-loop spindle control you will automatically get the
spindle speed you ask for in the G-code regardless of which pulley and
back-gear combination you have selected, as long as the speed
Stephen Wille Padnos wrote:
I think Jon's original comment was meant to say that a spindle encoder
without index is no use at all for rigid tapping. Not that there is no
use whatsoever for a spindle encoder without index.
Yup, that is my mindset right now, getting rigid tapping working
Kirk Wallace wrote:
Good job. I'm looking forward to your write up. Is there an index on
your spindle encoder?
It is worthless without the index. See
http://pico-systems.com/bridge_spindle.html
for the pics and info.
Jon
On 21 April 2010 16:48, Jon Elson el...@pico-systems.com wrote:
It is worthless without the index.
Not entirely worthless, you could still use if for closed-loop spindle
speed control. This actually makes some sense with a geared head like
the Bridgeport. My mill has two gears, but it doesn't
Andy Pugh wrote:
On 21 April 2010 16:48, Jon Elson el...@pico-systems.com wrote:
It is worthless without the index.
Not entirely worthless, you could still use if for closed-loop spindle
speed control. This actually makes some sense with a geared head like
the Bridgeport. My mill
Hey,
I have just gotten a spindle encoder working on a Bridgeport 1J (step
pulley) head. There's no sane way to couple to the spindle, the only
way is to install gear tooth sensors that read the teeth of the bull
gear. I am going to write up a web page on it in the next couple days.
I just
On Tue, 2010-04-20 at 22:43 -0500, Jon Elson wrote:
Hey,
I have just gotten a spindle encoder working on a Bridgeport 1J (step
pulley) head.
... snip
Good job. I'm looking forward to your write up. Is there an index on
your spindle encoder?
--
Kirk Wallace
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