making my machine distance work accuratly
05 Mar 2013 03:32 - 05 Mar 2013 03:37 #30876
by revo
Replied by revo on topic making my machine distance work accuratly
so driver microstepping is not important? if its 10 or 1?
for the motor, i do 1: 2.1 or2:1 or 1:2
for the motor, i do 1: 2.1 or2:1 or 1:2
Last edit: 05 Mar 2013 03:37 by revo.
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05 Mar 2013 03:36 #30877
by andypugh
But all that really matters is that the AXIS_SCALE number is correct for the actual pulley ratios, gear sizes and drive microstep settings.
I repeat: All that section of Stepconf does is calculate a single number that tells LinuxCNC how many steps to send per unit of travel distance. It has no affect on anything else.
Replied by andypugh on topic making my machine distance work accuratly
There is something to be said for having numbers that make sense. That way, if you later change the microstep ratio or the pulley sizes you know what to change.so driver microstepping is not important? if its 10 or 1?
But all that really matters is that the AXIS_SCALE number is correct for the actual pulley ratios, gear sizes and drive microstep settings.
I repeat: All that section of Stepconf does is calculate a single number that tells LinuxCNC how many steps to send per unit of travel distance. It has no affect on anything else.
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05 Mar 2013 03:41 #30878
by revo
Replied by revo on topic making my machine distance work accuratly
so what ever number you use to get to the right axis scale will give you the right combo.
isee..
i would have never guess.
ill go to the shop and try that right away and report back.
now for the speed, and velocity, what is the ball parke for a normal stepper? i know its all different from machine to machine but just a ball park so i can try something that should work and see why my motor run so rough and eleminate from there,
isee..
i would have never guess.
ill go to the shop and try that right away and report back.
now for the speed, and velocity, what is the ball parke for a normal stepper? i know its all different from machine to machine but just a ball park so i can try something that should work and see why my motor run so rough and eleminate from there,
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05 Mar 2013 03:57 - 05 Mar 2013 04:02 #30879
by revo
Replied by revo on topic making my machine distance work accuratly
now one more thing.
as for the Z axis.
is someone know what the cncrp setting are for the 5 star ACME screw?
1 rotation move 1/2''
as for the Z axis.
is someone know what the cncrp setting are for the 5 star ACME screw?
1 rotation move 1/2''
Last edit: 05 Mar 2013 04:02 by revo.
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05 Mar 2013 05:00 #30880
by revo
Replied by revo on topic making my machine distance work accuratly
ok bIG JOHN trick worked beautiful! so 1 in every box. the ration is 2;1
and the motor were running rough because the step had to be reverse.
perfect! thanks so much.
i would have not be able to do that on my own. now i have trouble with my Z
the screw has 10 thread per 1''. it moves 0.5'' per motor turn. how do i figure out the actual pitch?
and the motor were running rough because the step had to be reverse.
perfect! thanks so much.
i would have not be able to do that on my own. now i have trouble with my Z
the screw has 10 thread per 1''. it moves 0.5'' per motor turn. how do i figure out the actual pitch?
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05 Mar 2013 05:08 #30881
by andypugh
Replied by andypugh on topic making my machine distance work accuratly
The actual pitch is the distance per rev, so you need to use 2 tpi, or 12.7mm pitch.the screw has 10 thread per 1''. it moves 0.5'' per motor turn. how do i figure out the actual pitch?
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05 Mar 2013 07:32 #30885
by revo
Replied by revo on topic making my machine distance work accuratly
thanks for repeating, i guess i dont understand what i am doing.
thanks for the patience.
everything move beautifuly but my distance on X and Y are off. god thisis driving me nuts.
its weird because i have the setting from the site were i bought this stuff. wonder what i am doing wrong.
the speed is good, it home nicely, still problem with soft limits, ill figure that out today but i wonder why my distance are off. i set it up in inches, ill convert later, when i have 1273.2 step per inches the distance should be fine.
if iwant to double the distance i double that number?
thanks for the patience.
everything move beautifuly but my distance on X and Y are off. god thisis driving me nuts.
its weird because i have the setting from the site were i bought this stuff. wonder what i am doing wrong.
the speed is good, it home nicely, still problem with soft limits, ill figure that out today but i wonder why my distance are off. i set it up in inches, ill convert later, when i have 1273.2 step per inches the distance should be fine.
if iwant to double the distance i double that number?
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05 Mar 2013 08:09 #30887
by andypugh
Yes. Then the system will send out twice as many steps.
Replied by andypugh on topic making my machine distance work accuratly
if iwant to double the distance i double that number?
Yes. Then the system will send out twice as many steps.
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05 Mar 2013 08:39 #30888
by alan_3301
Replied by alan_3301 on topic making my machine distance work accuratly
do you have 3.2:1 gearing or 2:1?
Those are the 2 options if you are using the nema 34 driver from cncrouterparts.com
There are other options if you are using nema 23 will be 3:1 or 2.73:1.
So you need to be sure what you are using.
I Think you said earlier you had the nema34 PRO stuff.
that should be the 3.2:1 gearing which would be 2037.18 as your scale.
If you have 2:1 gearing you should use 1273.4 as your scale.
For Z axis, scale should be 4000 w/ a 1/2-10 5start screw w/ 10x microstepping
Those are the 2 options if you are using the nema 34 driver from cncrouterparts.com
There are other options if you are using nema 23 will be 3:1 or 2.73:1.
So you need to be sure what you are using.
I Think you said earlier you had the nema34 PRO stuff.
that should be the 3.2:1 gearing which would be 2037.18 as your scale.
If you have 2:1 gearing you should use 1273.4 as your scale.
For Z axis, scale should be 4000 w/ a 1/2-10 5start screw w/ 10x microstepping
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05 Mar 2013 11:11 - 05 Mar 2013 11:13 #30892
by revo
Replied by revo on topic making my machine distance work accuratly
i am using the 2;1 not pro. nema34 all around even on Z.
i was aking at the beginning for another machine. now i am setting up my own machine and i am having hell of a time. i gues its real setting, no xml file already done for me and i never done it so i am a bit lost. i also never played with linuxcnc so its all much to chew on.
new question if someone can help. i search the forum but cant quite see what i need.
i am trying to set my limit
the machine has switches (both limit and home in one on each axis)
id like to have the machine home in left back corner Z all the way up.
here is the dimension of the machine. Y 29'' X 120'' Z 10''
i would like Z to be at zero when its all the way up and going down in negative.
the x and z moving in positive.
everything that i am doing doesnt work.
can i set the minimum at 0 or its has to be inside of zero? is the limit switch is 0 and the soft limit 0.01 ?
i was aking at the beginning for another machine. now i am setting up my own machine and i am having hell of a time. i gues its real setting, no xml file already done for me and i never done it so i am a bit lost. i also never played with linuxcnc so its all much to chew on.
new question if someone can help. i search the forum but cant quite see what i need.
i am trying to set my limit
the machine has switches (both limit and home in one on each axis)
id like to have the machine home in left back corner Z all the way up.
here is the dimension of the machine. Y 29'' X 120'' Z 10''
i would like Z to be at zero when its all the way up and going down in negative.
the x and z moving in positive.
everything that i am doing doesnt work.
can i set the minimum at 0 or its has to be inside of zero? is the limit switch is 0 and the soft limit 0.01 ?
Last edit: 05 Mar 2013 11:13 by revo.
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