Learn what a G28 move is and how it works.
- The return to home command is the G28.…And you can call the G28 to send your machine…back to the machine home position.…You can also add an X, a Y, or a Z value…to automatically make the machine…go to an intermediate position before returning to home.…Let me show you how it works.…So, first off, we need to make sure…we're using an incremental mode,…so we're using a G91 mode with that G28.…Now, we can call the G91, then the G28,…and then a X, a Y, and a Z, now notice these are all zero,…that means it's not going to go anywhere before heading home.…
So it's already there, so it's just going to…go ahead and just head back to home.…Now, if you wanted to add something like a Z of 4.0,…it's going to go to an intermediate position…that happens to be four inches above where it currently is.…You could also add X moves or Y moves…or wherever you happen to want to move that machine…prior to heading back to the machine home position.…Now, most of the time, people will be doing that…if they had some type of a fixture…or some type of a clearance problem…
Author
Released
4/2/2018- CNC concepts
- G-code editor and simulator software
- G-codes: G00-G84
- M-codes: M00-M09
- Writing a sample program in G-Code
Skill Level Beginner
Duration
Views
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Introduction
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Welcome1m 12s
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1. CNC Concepts
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Understand tool offsets5m 9s
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Modal functions2m 50s
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Safety block2m 49s
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Safety checks3m 41s
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Programming resources2m 57s
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2. G-Codes
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G00: Rapid moves5m 44s
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G01: Feed moves4m 17s
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G04: Dwell3m 39s
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G83: Peck drilling cycle6m 8s
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G84: Tapping4m 10s
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3. M-Codes
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M00: Program stop2m 24s
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M01: Optional stop2m 50s
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M06: Tool change2m 31s
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M08: Coolant2m 9s
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4. Sample Programs
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Write a sample program13m 10s
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Review the program code5m 42s
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Conclusion
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Next steps1m 13s
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Video: G28: Return to machine zero position