Gentlemen,
A little progress on the handwheel tapping project.
The spindle motor encoder has pulses of 7200 per revolution in low gear.
This gives 20 pulses per degree. Not enough to be a real C axis. The number
of pulses may be limited by the spindle drive so I may try to tap into the
sign
Stuart Stevenson wrote:
The most important finding is the ultimate usefulness of tapping this way.
It seems novel but is it a useful tool? Putting it on the Cinci or Viper for
5 axis MPG tapping would be killer!
Well, I don't do those hideous aerospace metals. But, I have done some
Stuart,
See:
http://deepblue.lib.umich.edu/bitstream/2027.42/60859/1/paulgrif_1.pdf
Figure 2.1
Ken
On 10/01/2010 09:32 PM, Stuart Stevenson wrote:
Hi Ken,
That is a good idea!!! Isn't it possible to use a stepper motor as a pulse
generator? If so, wouldn't it be possible to variably
Hi Stuart,
If you are going to do some computer assisted hand tapping, you might
want to add some haptic feedback. If you measure the spindle current and
use that as a measure of load, you could drive a small servo connected
to the mpg and use it as a brake. If you make the braking force
Hi Ken,
That is a good idea!!! Isn't it possible to use a stepper motor as a pulse
generator? If so, wouldn't it be possible to variably bias that same stepper
to achieve the haptic feedback?
thanks for the idea
Stuart
On Fri, Oct 1, 2010 at 7:45 PM, Kenneth Lerman
Stuart,
You might want to take a look in the Subroutines section of the EMC2
Forum. A tapping routine would be simple to do using Dewey Garrett's GUI.
John
Stuart Stevenson wrote:
Gentlemen,
I am working on a project on the Enshu. I am not sure how valuable it will
be but I sure want to
Maybe you could use what andy did with his gear hobbing?
I don't know exactly how he did it - (maybe using the gearing hal comp?)
I could see using a vcp that you would enter the tpi and it woud slave
the spindle to z with that ratio. Then as you jogged the z axis - the
spindle would
On 30 September 2010 16:15, sam sokolik sa...@empirescreen.com wrote:
Maybe you could use what andy did with his gear hobbing?
It does sound like a very similar approach.
If you consider my spindle encoder to be your MPG, and your spindle to
be my workholder axis, then it is actually as
Hi Stuart,
I'd like to offer some general observations and thoughts.
Tapping requires a very close coordination of spindle rpm and axis
feedrate.
MPG axis feedrate by it's nature varies constantly as the operator
rotates the MPG slightly faster or slower.
Attempting to create a system
On 30 September 2010 19:12, Jim Fleig j...@cncservices.ws wrote:
Attempting to create a system where the spindle rpm's could be
adjusted in real time to match the constantly varying feedrate caused
by the inconsistent rpm of MPG input would be a significant challenge
if it is doable.
It
Stuart Stevenson wrote:
Gentlemen,
I am working on a project on the Enshu. I am not sure how valuable it will
be but I sure want to try it. I want to tap threads using the MPG.
How do you envision this working? Does the handwheel make the machine a
virtual hand tapper? (ie, spin 1/2
On Thu, Sep 30, 2010 at 2:10 PM, Stephen Wille Padnos spad...@sover.netwrote:
Stuart Stevenson wrote:
Gentlemen,
I am working on a project on the Enshu. I am not sure how valuable it
will
be but I sure want to try it. I want to tap threads using the MPG.
How do you envision this
Stuart Stevenson wrote:
My first thought was to control the spindle with the MPG and have the Z (or
other linear axis) scaled to the correct feedrate. With the MPG controlling
the spindle the reversal should not need to be as abrupt.
You can make the spindle reversal as smooth as you like,
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