We all make mistakes.

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A fórum moderátora: KisKZ, Tomi, tweakie, Amatőr

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tweakie

Dátum/Date: Szerda, 2012-05-30, 09:26 | Üzenet/Post # 1

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I don't normally post pictures of the trash but this may be of help to others.

I recently replaced the flexible coupling on my Y Axis and everything was fine until I cut this piece (which was profiled in two passes with a 30 degree engraving point).
The new coupling was bored 1/4" and the motor shaft is 6mm - what I thought was tight obviously wasn't (but it is now biggrin

).

Tweakie.

Csatolások/Attachments: 7784854.jpg(36.8 Kb)

Success consists of going from failure to failure without loss of enthusiasm.

Amatőr

Dátum/Date: Szerda, 2012-05-30, 20:25 | Üzenet/Post # 2

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tweakie, it's a lucky case when You could find the problem after a short work. I can imagine a situation when the coupling makes just a little playing on the shaft and makes several wrong workpieces until it can be found.
I had a similar case with a loose screw what sent a cople hours workpiece into trash.
The best we can do is weld down all the loose parts smile

H1i.hu

tweakie

Dátum/Date: Csütörtök, 2012-05-31, 09:18 | Üzenet/Post # 3

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Hi Amator,

Yes indeed, lucky to find the problem first time.

Newcomers to the world of CNC may often suspect missing steps as being the cause but on many occasions problems are more often than not of a mechanical nature.

Welding is good because if something can possibly come loose then sooner or later it will come loose biggrin

Tweakie.

Success consists of going from failure to failure without loss of enthusiasm.

elektron

Dátum/Date: Péntek, 2012-06-01, 00:31 | Üzenet/Post # 4

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Tweakie, is there a good collection of the possible causes of missing steps somewhere on a cnc forum ?

elektron

tweakie

Dátum/Date: Péntek, 2012-06-01, 06:17 | Üzenet/Post # 5

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Quote (elektron)

Tweakie, is there a good collection of the possible causes of missing steps somewhere on a cnc forum ?

elektron

Hi elektron,

Yes indeed, but you could spend all day reading biggrin

There are thousands of them here http://www.google.com/cse?cx=.....page=1

And again here http://www.machsupport.com/forum/index.php?action=search2

As mentioned earlier, most of the problems relate to mechanical issues such as tightness or binding of the lead screw / linear slides which show up when an axis is driven too fast (stepper motor torque decreases as rotational speed is increased and there comes a point where the resistance to motion exceeds the available torque).

Tweakie.

Success consists of going from failure to failure without loss of enthusiasm.

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