change configs from mm to inches

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travis036
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14 Sep 2019 08:36 #145116 by travis036

change configs from mm to inches was created by travis036

when i first setup my CNC, i thought it would be easier to use millimetres, though i am now realizing that as i am used to working in inches, being in the US, i would like to change to inches, but without running stepconf, as it will overwrite my custom additions. is there an easy way to change my machine to inches? or is it easier to just start over?

~Travis

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tommylight
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14 Sep 2019 09:26 #145118 by tommylight

Replied by tommylight on topic change configs from mm to inches

You can edit the ini file, it is easy enough.

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rodw
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14 Sep 2019 09:42 #145119 by rodw

Replied by rodw on topic change configs from mm to inches

tommylight wrote:
You can edit the ini file, it is easy enough.

Change this

LINEAR_UNITS = mm

LINEAR_UNITS = inch

See
linuxcnc.org/docs/devel/html/config/ini-...g.html#_traj_section

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travis036
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14 Sep 2019 09:46 - 14 Sep 2019 09:46 #145120 by travis036

Replied by travis036 on topic change configs from mm to inches

Hmm, easier than i thought... then i just have to find all the settings in metric (like software limits, and such).

Thanks.

~Travis

Last edit: 14 Sep 2019 09:46 by travis036.

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tommylight
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14 Sep 2019 11:30 #145124 by tommylight

Replied by tommylight on topic change configs from mm to inches

Yes, that is correct.

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Clive S
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14 Sep 2019 14:13 #145132 by Clive S

Replied by Clive S on topic change configs from mm to inches

rodw wrote:

tommylight wrote:
You can edit the ini file, it is easy enough.

Change this
LINEAR_UNITS = mm
to
LINEAR_UNITS = inch
See
linuxcnc.org/docs/devel/html/config/ini-...g.html#_traj_section

Would a g20 in the gcode do the same job .

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travis036
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14 Sep 2019 15:15 #145139 by travis036

Replied by travis036 on topic change configs from mm to inches

under the AXIS, i have a SCALE of 320. i don't remember how i calculated this, so i don't know how to change it from mm to inch, or even if i need to... (been a while, and i didn't take notes as i set it up. sorry)

~Travis

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travis036
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14 Sep 2019 17:02 #145146 by travis036

Replied by travis036 on topic change configs from mm to inches

found this information:

    200step/revolution steppers
    8x microstepping
    5mm ballscrew lead

not sure how to calculate scale... though in after thought, i can just run step config, and save to a different file, and grab the values i need out of it.

~Travis

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rodw
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14 Sep 2019 21:43 #145177 by rodw

Replied by rodw on topic change configs from mm to inches

If you had 320 steps per mm, you would have 320 * 25.4 = 8128 steps per inch

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travis036
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14 Sep 2019 21:51 #145179 by travis036

Replied by travis036 on topic change configs from mm to inches

wow, i feel a bit dumb now, not knowing it was that simple. thought there was far more complex math involved.

maybe i just over thinked the whole process.

Thanks!

~Travis

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