Uneven Incremental Movement

[KickinWing]

Ok so I'm currently transitioning from Mach 3 to CNC 12 and I have a few questions. As of right now I have the board and the software up and running on the bench. Figured I would get familiar with how CNC 12 functions before I take the mill offline to do the conversion. But I noticed that when I jog using incremental mode the jog increments are not the same moving an axis in the both directions. For example if I move the x axis one positive increment the DRO reads 0.0009". When I move it back one negative increment now the DRO reads 0.0001". Another example is I increment one positive movement and the DRO reads 0.0009", then increment positive once again and now the DRO reads 0.0016". I would think it should be more like 0.0018" if the increments were even.

Also is there anyway to define what the increment steps should be? Mach 3 was setup in metric and frankly that's what I'm used to now. But if I set CNC 12 to metric the incremental moves are still in imperial. Is there a way to alter this?

[tblough]

Parameter 40 controls the basic jog increment. If you will post a machine report, we can see you current configuration and offer some advice.

[KickinWing]

I'm hoping that once I have all the lead screw and step information in the setup this will behave like I would expect. Anyway I've attached a copy of the report from my machine.

[cnckeith]

I'm hoping that once I have all the lead screw and step information in the setup this will behave like I would expect. Anyway I've attached a copy of the report from my machine.

related reading.
Steps per Revolution and Overall Turns Ratio, don't do it like Mach did it!
viewtopic.php?t=1801

[cnckeith]

P40 is set to .02 mm in the report.zip , so with incremental set to x1, everytime you press the jog button the machine would increment .02 mm
which is super small. at 1600 steps per rev x 5 mm per turn. that leaves only 320 steps per mm. typically on a milling machine its best to have a bit more resolution per travel for best performance. what make model stepper drives are you using? would be great to run them at 2000 or 3200 steps per rev.
are you really using leadscrews? or ballscrews? post photos and more info about the machine and cnc controller and we can give you better advice.

I invite you to make a build thread, here is how.
viewtopic.php?f=60&t=6928

Creating a "build thread" on centroidcncforum.com offers several advantages for a customer, particularly those working on CNC projects with Centroid products like the Acorn, AcornSix, USB-BOB,Hickory, Oak, or Allin1DC controllers. Based on the forum’s structure and guidance, here’s why it’s beneficial:
Organized Documentation: A build thread consolidates all information, questions, and progress about your CNC machine project into a single, cohesive post. Instead of scattering details across multiple threads or emails, everything—from initial setup to troubleshooting—is in one place. This makes it easier for you and us to track your progress and refer back to earlier steps or solutions.

Timely CNC Technical Assistance: The forum’s posting guidelines highlight that a build thread is "an effective way to receive timely technical support." By keeping everything centralized, experts like moderators or other power users can quickly spot where you’re at and offer targeted solutions, especially since Centroid staff actively monitor the forum.

Resource Centralization: The forum encourages linking to a single photo album, YouTube channel, or Google Drive folder within your thread. This keeps all visuals and files in one spot, making it easier for you to manage resources and for others to follow along without sifting through attachments spread across multiple posts.

Showcasing and Learning: A build thread lets you document your journey start-to-finish, which can be satisfying and educational. You can share successes (like completed retrofits, featured in the "Success Stories" section) and learn from feedback. It also inspires others while allowing you to refine your approach based on community input.

Better Support from the CNC Community: The forum emphasizes that a build thread helps others understand your project comprehensively. When you need help, responders (including Centroid staff and experienced users) can see the full context—photos, specs, and prior issues—without you having to repeat yourself. This leads to faster, more accurate advice, as the community doesn’t have to dig through disjointed posts to piece together your situation.

In short, a build thread streamlines communication, enhances support quality, and creates a valuable record—saving you time and frustration while maximizing the forum’s collaborative potential.