Home location different every day - Lathe
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29 Apr 2018 01:48 #109785
by AppleAssassin
Home location different every day - Lathe was created by AppleAssassin
Hey guys,
I have a home switch on the X axis of my lathe, it's currently a mechanical switch (But I'm hoping that's the problem here so I can change it and fix it)
But every day when I go to use my lathe, the home location will change, could be 0.05mm or 1mm difference every day.
This is a problem on the X axis because it means I need to basically set it up and tell it where the centre of the spindle is every time I want to use it, meaning a 2 minute part takes 15 minutes due to the setup. So I'll have to change the tool offsets every day. Is this a normal procedure, or should the home location stay the same every day?
I thought it could be due to inaccuracies within the mechanical switch, or if a slight (and annoying) variation in home distance is normal.
thanks
I have a home switch on the X axis of my lathe, it's currently a mechanical switch (But I'm hoping that's the problem here so I can change it and fix it)
But every day when I go to use my lathe, the home location will change, could be 0.05mm or 1mm difference every day.
This is a problem on the X axis because it means I need to basically set it up and tell it where the centre of the spindle is every time I want to use it, meaning a 2 minute part takes 15 minutes due to the setup. So I'll have to change the tool offsets every day. Is this a normal procedure, or should the home location stay the same every day?
I thought it could be due to inaccuracies within the mechanical switch, or if a slight (and annoying) variation in home distance is normal.
thanks
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29 Apr 2018 01:51 #109786
by AppleAssassin
Replied by AppleAssassin on topic Home location different every day - Lathe
I should also add that I've checked this with a DTI. If I home it several times sometimes it'll go back to 0, sometimes it'll be 0.5mm out so this is why it leads me to believe the switch is the problem.
Would a hall effect sensor make a better switch, or something else?
Would a hall effect sensor make a better switch, or something else?
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01 May 2018 23:34 #109971
by andypugh
Replied by andypugh on topic Home location different every day - Lathe
Is this a stepper-based system?
I wonder if your final move to home is too fast, and you are stalling the motor (this would be a pretty random effect).
If you set the latch velocity _really_ slow you should be able to watch for the point at which the switch triggers on the DTI.
I use proximity switches for all my homes and limits and they work pretty well (but I also use resolvers / encoders so can use the index for 100% accurate home positions too).
One time when my lathe was acting random is turned out that the pulley was loose...
I wonder if your final move to home is too fast, and you are stalling the motor (this would be a pretty random effect).
If you set the latch velocity _really_ slow you should be able to watch for the point at which the switch triggers on the DTI.
I use proximity switches for all my homes and limits and they work pretty well (but I also use resolvers / encoders so can use the index for 100% accurate home positions too).
One time when my lathe was acting random is turned out that the pulley was loose...
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01 May 2018 23:37 #109972
by AppleAssassin
Replied by AppleAssassin on topic Home location different every day - Lathe
Yeah it's a stepper based system with a direct connection to the ball screws. I.e no pulleys of any kind.
I'll try slowing down the home search to see if that makes a difference
I'll try slowing down the home search to see if that makes a difference
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