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Stepper config test confusing old user
23 Aug 2015 22:37 #61687
by Chris401
Stepper config test confusing old user was created by Chris401
I am an old user rebuilding a shop made gantry router with new gecko 203V drivers. Running through a simple BO board.
Pretty simple
200 step/rev motors
1:1 ratio to drive screw
10 rev/inch screw. ( yes a know it is a lot of resolution for a wood machine but that will be the next step )
set microstep to 1
When I run the test everything is nice and smooth but it is moving exactly 1/10 the commanded distance and at about 1/6.6 the rate, very repeatable.
I get a feeling I am tripping over something simple but Darned if I can see it. Running a fresh basic 2.6 download of LinuxCNC and
used the 203V settings build into stepper config wizard. Don't know if I am missing something on the config or the use of the 203Vs.
Any ideas?
Pretty simple
200 step/rev motors
1:1 ratio to drive screw
10 rev/inch screw. ( yes a know it is a lot of resolution for a wood machine but that will be the next step )
set microstep to 1
When I run the test everything is nice and smooth but it is moving exactly 1/10 the commanded distance and at about 1/6.6 the rate, very repeatable.
I get a feeling I am tripping over something simple but Darned if I can see it. Running a fresh basic 2.6 download of LinuxCNC and
used the 203V settings build into stepper config wizard. Don't know if I am missing something on the config or the use of the 203Vs.
Any ideas?
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24 Aug 2015 00:25 #61704
by cncbasher
Replied by cncbasher on topic Stepper config test confusing old user
i believe geko's run by default at 10 microsteps
not that i use them
change microstep from 1 to 10 should fix it
not that i use them
change microstep from 1 to 10 should fix it
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24 Aug 2015 02:14 #61713
by BigJohnT
Replied by BigJohnT on topic Stepper config test confusing old user
The Gecko 203v (great drive) is fixed at 10 microsteps.
JT
JT
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24 Aug 2015 03:30 #61718
by Chris401
Replied by Chris401 on topic Stepper config test confusing old user
Thanks folks. Went to 10 ms and it works fine. Limited by step rate now so time to play with some different ratio pulleys.
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24 Aug 2015 05:57 #61726
by BigJohnT
Replied by BigJohnT on topic Stepper config test confusing old user
Pair the 203v's with a Mesa 5i25 7i76 combo and you won't have step rate issues.
JT
JT
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24 Aug 2015 08:32 #61729
by Chris401
Replied by Chris401 on topic Stepper config test confusing old user
Thanks Big John. I will file that away though. More $ than my wife would tolerate right now . I will be instructing a class just after the first of the year and may be able to do it on that check. I'd already made a set of XL pulleys to try and I do that first.
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