G81 Spindle Reversal Between Each Hole

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14 Sep 2025 17:36 #334985 by Darium
Hi,
Is there any way to easily add spindle reversal each hole during drilling? I drill a lot and the my steel is too stringy regardless of speed and feed. i came across HASS video of it. this is the linkĀ 
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is there any way I can modify G83 like that? or even better spindle reversal between pecks

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14 Sep 2025 19:10 - 14 Sep 2025 19:17 #334991 by langdons
Replied by langdons on topic G81 Spindle Reversal Between Each Hole
"stringy" steel is actually a good thing in many ways; metal dust is bad.

The stringy turnings can be used for stuff like homemade steel wool.

Perhaps magnets are a solution?

If you have a magnet in the home location or something, the spindle could move there and deposit its strings fter each drill.

Unless your spindle motor and spindle driver are capable of instant reversing, you will have to wait for the motor to stop, then reverse, stop again, and restart, which could be a lengthy procedure, not to mention being potentially detrimental to the spindle and/or driver in the long term.
Last edit: 14 Sep 2025 19:17 by langdons. Reason: Clarified meaning and added info.

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14 Sep 2025 22:02 #334994 by unknown
Replied by unknown on topic G81 Spindle Reversal Between Each Hole
You might have some luck in remapping an unallocated gcode, but I'm unsure how this would integrate with your cam software.
linuxcnc.org/docs/html/remap/remap.html

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14 Sep 2025 22:10 #334996 by unknown
Replied by unknown on topic G81 Spindle Reversal Between Each Hole
Sorry submitted before I was going to suggest would a subroutine help, not quite as convient as a canned cycle.
I guess you've meesed around with different feeds and speeds as well.

And no strings are not good Langdon's, as they can leave ugly marks on softer metals. And if you watched the video some other issues as well.
I for one would not want to be handling steel wool that will want to turn why fingers into a bloody mees. By the the way those strings and flattish with very sharp and jagged edges, nothing at all like steel wool. Seriously dude are you ok ?

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14 Sep 2025 23:26 #334999 by tommylight
Replied by tommylight on topic G81 Spindle Reversal Between Each Hole
Are you using "peck drilling" ?

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