On 10/2/26 12:24, Stuart Stevenson wrote:
On a 3 axis machine with a rotary/tilting rotary table added then TLO would
just work as intended with or without the table on the machine.
On a machine that tilts the cutting tool then the TLO would have to be
calculated for every tool position. This is a very simple calculation.
With multiaxis TLO, you are able to use GCode programs no matter if a tool
length is used to generate the code or not. You can compensate for pivot
distance and/or tool length by modifying the value in the TLO register in
the control. This complicates the use of TLO by adding human input in the
register, but with operator attention it works very well.
regards
Stuart
My home-made rotary's can do 600 or more revs. The coupling is so tight
that when carving a buttress thread I don't need any "degree" offset
other than changing the angle by 180 degrees. I carve a 2 start screw by
going down the work, lift the tool clear, adding 180 to the start & stop
angle, run the rotary to the new angle, drop the tool and carve the 2nd
start coming back to the new start. reset to the original & move Z & Y
to next loop. Wash, rinse, repeat till done. Printed nuts just fit
either thread.
The rotary's are an rvs30 5/1 worm from e-bay, with a 3NM closed loop
stepper/servo motor. Home switches are 8mm prox sensors. Total cost per
axis is about $300 + high voltage PSU b4 tarriffs. 500 times faster but
not quite as accurate as a motorized BS1 clone. About .1 degree accuracy.
On Fri, Oct 2, 2026 at 10:08 AM Viesturs Lācis <[email protected]>
wrote:
trešd., 2026. g. 30. sept., plkst. 19:24 — lietotājs Nicklas SB
Karlsson (<[email protected]>) rakstīja:
ons 2026-09-30 klockan 10:35 +0100 skrev andy pugh:
What _might_ work would be for the INI file to define the position (in
machine coordinates) of the rotational axes. (or, to be more specific,
the location of the axis of each of the rotary axes)
Why?
If I think right tool length compensation is however important.
Feed is the plane perpendicular to tool direction. Excluding movement
along tool direction and move along three
more degree of freedom tool length compensation is important to get it
right.
Just a small note - it seems to me that initial question and Andy's
suggestion is about rotary axis which rotates the workpiece - IMHO
tool length compensation would work correctly. OTOH your suggestion
looks to be related to tool being rotated in machine coordinate system
which does make things a lot more complicated
Viesturs.
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