Thread: Question about couplings...
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22-04-2021 #1
Hi!
I’m unsure of what couplings to use. As it seems I will go with alu couplings with a slit in them. Any thoughts about that?
I’ve noticed that the ball screws are round at the end. Is there any reason that they don’t have a flat surface as the motors has?
I’m thinking that maybe if something goes wrong they will come loose and prevent further damage.
Thanks, JW
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22-04-2021 #2
No, they are the worst coupling to use. you are better using an Oldham-type coupling like this.
http://www.fbtmotion.com/html/16.html
Or better still a disc type coupling like this
http://www.fbtmotion.com/html/17.html
Regards the ball screw then just file a small flat onto the shaft, the machined portion is soft enough to file.-use common sense, if you lack it, there is no software to help that.
Email: [email protected]
Web site: www.jazzcnc.co.uk
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25-04-2021 #3
Thanks!
I guess the coupling is flexible above a certain amount of torque right?Last edited by JW1977; 25-04-2021 at 11:54 AM.
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25-04-2021 #4
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The Following User Says Thank You to dazp1976 For This Useful Post:
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25-04-2021 #5
It's all to do with parallel and Angular misalignments and to a lesser degree axial growth or misalignment.
Read this it will explain the different types and Torque ratings etc.
https://www.thomasnet.com/articles/h...oupling-types/-use common sense, if you lack it, there is no software to help that.
Email: [email protected]
Web site: www.jazzcnc.co.uk
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The Following User Says Thank You to JAZZCNC For This Useful Post:
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07-06-2021 #6
*JAZZCNC*
Do you have any idea or an example of how much runout that can be accepted in a ballscrew?
Offcourse its hard to answer and its related to length but i was thinking that maybe you have a general idea?
Im asking because i had some of mine modified in the ends for different reasons. The guy who did it is an experienced machinist used to high precison machines so i guess that in his world my screws are pretty bent. I dont remember exactly but i think that my 900 mm screw where off by 0,4 mm. Im gonna check for myself when i get it back but i think the measure he referred to was when the screw was laying flat and you measure from the flat surface up to nearest point of the screw...
Cheers
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