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Manual tapers

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13 Jan 2021 08:54 #195196 by anfänger
Manual tapers was created by anfänger
I will have two mpg for x and z axis, so i can use the lathe in „manual mode“ when I want to do simple operations.
I wonder if there is an easy way to give the z axis an angle for cutting a taper manually?

Thanks Patrick

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13 Jan 2021 09:11 #195197 by andypugh
Replied by andypugh on topic Manual tapers
For simple operations I use: forum.linuxcnc.org/41-guis/26550-lathe-macros
The ability to cut tapers is built-in to the turning, facing and boring tabs.
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13 Jan 2021 09:37 - 13 Jan 2021 09:39 #195200 by anfänger
Replied by anfänger on topic Manual tapers
Thanks I‘ll have a deeper look at them, cause they look very useful maybe moving them to qtpyvcp cause I am using this at my mill and I am kind of used to it


I was thinking about moving the the X and Z together at an angle and was wandering if it can be done in hal.
Last edit: 13 Jan 2021 09:39 by anfänger.

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13 Jan 2021 10:13 - 13 Jan 2021 10:27 #195201 by andypugh
Replied by andypugh on topic Manual tapers

I was thinking about moving the the X and Z together at an angle and was wandering if it can be done in hal.


Yes, quite easily.
Potentially using a HAL sum2 component: linuxcnc.org/docs/2.8/html/man/man9/sum2.9.html
You could sum Z and X before passing to the motor, with gain1 set to zero normally, but set to a value (halcmd prompt) as needed.

But, really, you might as well use CNC.

Here is an example of my macros in use (including a taper):

Last edit: 13 Jan 2021 10:27 by andypugh.

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13 Jan 2021 10:13 #195202 by rodw
Replied by rodw on topic Manual tapers



I was thinking about moving the the X and Z together at an angle and was wandering if it can be done in hal.


You could use external offsets to achieve this
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13 Jan 2021 10:24 #195203 by andypugh
Replied by andypugh on topic Manual tapers

You could use external offsets to achieve this


Probably better, as that will better comply to joint limits.

But I still don't think it is a sensible idea :-)
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13 Jan 2021 10:44 #195204 by anfänger
Replied by anfänger on topic Manual tapers
You are probably right :lol:

but external offset by angle sounds interesting.

I thin I will start wit the macros and if i need to waste more time I will dive into my braindead ideas.

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13 Jan 2021 10:49 #195205 by andypugh
Replied by andypugh on topic Manual tapers

I thin I will start wit the macros and if i need to waste more time I will dive into my braindead ideas.


If you are running LinuxCNC 2.8 / 2.8.1 then there is a sample config in sim/gmoccapy/lathe-configs/lathe macros with the macros all set up and ready to play with.
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13 Jan 2021 10:59 #195206 by anfänger
Replied by anfänger on topic Manual tapers
Good to know the I will start with gmocappy, though I prefer the look of qtpyvcp.

I hope I‘ll get the missing parts, so I can start assembling the control for my lathe.

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13 Jan 2021 11:52 #195207 by rodw
Replied by rodw on topic Manual tapers

You could use external offsets to achieve this


Probably better, as that will better comply to joint limits.

But I still don't think it is a sensible idea :-)


You are probably right :)

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