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- spumco
- spumco
25 Jan 2025 02:48 - 25 Jan 2025 02:51
Replied by spumco on topic Threading Index Varies With Speed
Threading Index Varies With Speed
Category: General LinuxCNC Questions
After pulling my hair out trying to figure out why G33.1 wasn't working on my lathe while attempting to test the problem raised in this thread, @cmorely pointed out I'm having the same issue.
forum.linuxcnc.org/38-general-linuxcnc-q...pping-problem#319786
So I can confirm spindle synchronization start points vary with spindle speed in G33.1 as well as G76 - and it's way worse on my lathe than the OP reported on his.
In my case a difference of 140rpm (60 vs 200) resulted in appx 0.750" difference between the Z-start point when synchronization kicked in on a 1/20 pitch (0.050").
According the the formula Andy posted earlier, my Z-axis requires the following distance to get up to speed
I don't understand why there is such a significant difference between what I'm seeing and what the OP's lathe is doing.
Unless somone has other thoughts, I think this is a bug.
forum.linuxcnc.org/38-general-linuxcnc-q...pping-problem#319786
So I can confirm spindle synchronization start points vary with spindle speed in G33.1 as well as G76 - and it's way worse on my lathe than the OP reported on his.
In my case a difference of 140rpm (60 vs 200) resulted in appx 0.750" difference between the Z-start point when synchronization kicked in on a 1/20 pitch (0.050").
According the the formula Andy posted earlier, my Z-axis requires the following distance to get up to speed
I don't understand why there is such a significant difference between what I'm seeing and what the OP's lathe is doing.
Unless somone has other thoughts, I think this is a bug.
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