G7 and G8
Either the cam output is in the wrong mode (not what you intended)
or you are in the wrong mode.
Because arcs use radii, what you tell your CAM the diameter is
does not mean it will use diameter mode for the code.
A lathe is not just something you can feed CAM code to unchecked.
It will crash badly if you do not understand the gcode and touch off
properly etc.
It is a very good idea to do a dry run with no stock in the chuck, or
offset the X position so that it runs
above the stock to check first.
On 30/05/19 21:10, markus wrote:
But that's wrong, if stock is diameter 45mm then it should retract to
22.5mm. X=0 is the rotation axis.
On Thu, 30 May 2019 22:55:59 +0300
Gediminas Dirma <[email protected]> wrote:
I understand what you said, but in CAM i set the stock diameter to
45mm and after generating gcode I inspect it and i can see that X
axis is maximum position is around 48mm ( for return passes it
retracts from work). But still somehow in machinekit it thinks that
it has to go twice the set X distance in the gcode. I found something
about G8 and lathe radius mode. Maybe this has something to do with
it.
2019-05-30, kt 22:49, Chris Albertson <[email protected]>
rašė:
Two numbers stand out 45mm and 90mm. Notice that 90mm is
exactly twice 45. A common mistake is to forget that moving the
tool 1mm reduces the diameter by 2mm. Diameter is twice the tool
movement. g-code specified tool movement, not part size Getting
this backward might explain the 45 and 90 error.
On Thu, May 30, 2019 at 11:40 AM Gediminas Dirma <
[email protected]> wrote:
Hello,
I am running CNC lathe with beaglebone and machinekit. Lets say
that i turn down cylinder from 45mm to 40mm. In my CAM i generate
gcode and it seems fine.
But then i upload it to machinekit, it changes turning diameter it
then starts turning not from 45mm but from 90mm and it turns down
5mm. It seemes that something
is with X axis, since Z is working fine. What could cause this
problem? Maybe I do something wrong with tool table but i followed
procedures writen here
http://linuxcnc.org/docs/html/lathe/lathe-user.html
Thanks for help.
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