Matt,
Are you seeing overvoltage faults on the VFD? If you are not decrease the decel
time until you see a fault and then bump it back up until you are fault free. I
don't know what the breaking resistors will do if you are not seeing a fault
now, they are used to drop the B+ from the regen during the stop. Is the tap
sequence M3, M5, M4 or M3, M4. The M3, M4 sequence is normally much better for
response an far less drift. What model number drive do you have? I have done a
lot of work over the years with Yaskawa drives the Hitachi drives should be
close. Lower Hz on the motor will normally help you more, I'm afraid that
backgear will compound your ramp time.
Scott
On Tuesday, July 21, 2020, 1:03:06 PM CDT, Matthew Herd
<herd.m...@gmail.com> wrote:
On a related note, I’ve noticed that the G-Code reference for G33 and G33.1
refers you to the integrators manual, but there’s little documentation on
spindle synchronized motion. I’d be willing to add a section based on what I
learn from this experience. It might be helpful to make sure there’s more of a
checklist and some of these cautions and observations in there.
> On Jul 21, 2020, at 1:56 PM, Jon Elson <el...@pico-systems.com> wrote:
>
> On 07/21/2020 12:09 PM, andy pugh wrote:
>> On Tue, 21 Jul 2020 at 18:03, Robert Ellenberg <rwe...@gmail.com> wrote:
>>
>>> 1. The rigid tapping cycle allows a hard-coded 10 revolutions
>>> <https://github.com/LinuxCNC/linuxcnc/blob/master/src/emc/tp/tc.c#L856>
>>> of overtravel beyond the nominal bottom of the hole when reversing
>>> direction.
>> That feels like there should be an error message.
>>
>> "Maximum rigid tapping limit exceeded. And furthermore I have just
>> broken your tap"
>>
> That, and maybe some explanation of this behavior in the docs. Maybe a more
> specific message would be "spindle took too long to reverse while rigid
> tapping".
>
> Jon
>
>
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