moving problem

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- tommylight
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Can you remove the motor and spin the ball screw by hand, fell if it changes the force needed to turn ?
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I ask because I have also thought about it, even that maybe it would be easier to do something simpler like starting with a fixed gantry machine and a bench with a single ballscrew for each axis.
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- tommylight
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Yes.RoberCNC wrote: .........You mean you think it points to inaccuracies or construction failures?
If i remember correctly your machine has a single ballscrew under the table for moving Y axis ?
You should definitely check that as they do tend to rack or bend and that causes a lot of friction.
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Uff, so surely that's it, which would make me very embarrassed and make me feel really stupid
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- tommylight
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Not to worry, we have all been there and done that !RoberCNC wrote: Uff, so surely that's it, which would make me very embarrassed and make me feel really stupid

Anyway, not such a big deal, stepper motors do not like to spin fast.
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Definitely the two Y ballscrews are very off center. Since the solution involves manufacturing new parts with basic tools and the difficulty that entails, I am considering making the union between motor and ballscrew by means of pulley and belt, even leaving aside the ballscrews at the moment and making the transmission with shapeoko type belt . I found a page in the UK that supplies pulleys and T5 belts, would they be valid for a hundredths precision? What other solutions do you advise me? I am open to all kinds of ideas and information.
Thank you.
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- tommylight
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Make them work, whatever it takes. See if you can find a small shop that can help you with what you need to make it work, or just try it again and again.
If you turn them by hand, you can notice when they are not properly mounted as the ammount of force changes drastically when they are off center.
Anither idea, since it is a small macine, you can mount only one ballscrew under the table and have it moving the gantry. Check the internet, there are plenty of machines that have only one of them under the table.
Using belts on a router is a no no, for way to many reasons.
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Yes, I have seen many machines of the type that you say but I would be doing everything again, so I will have to do and do what I have as you say. Thank you very much for your opinion and help, it is very valuable for me.
I said about joining stepper and ballscrew by pulley and belt because and observed that all the machines at work are built like this and it has always caught my attention and now that I am having all these problems I think I understand why, it offers flexibility since you don't have to perfectly align the stepper and ballscrew centers and I suppose that it has the advantage of offering greater precision of the ballscrew by means of the pulley relation and avoiding microstepping and the loss of Torque that entails it, I don't know if I'm right.
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