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Can I use a different z axis threaded bar finer than 1.25 pitch

Dave in Spain

Can I use a different z axis threaded bar finer than 1.25 pitch
October 19, 2013 11:42AM

Registered: 10 years ago
Posts: 8

I am just starting to design my printer I am new to this and I want to build one with good stabilaty and acuracy, so is it possable to use a finner threaded z axis bar for moving the extruder up and down? so can I adjust the program to allow for this?

Dave

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Traumflug

Re: Can I use a different z axis threaded bar finer than 1.25 pitch
October 19, 2013 01:06PM

Registered: 13 years ago
Posts: 7,616

M8 has plenty of accuracy. In numbers: 1.25 mm / ( 200 * 16 ) = 0.4 micrometers. 0.2 um for 1/32 microstepping or 0.9 deg steppers, 0.1 um for both.

That said, you can use an even finer pitch. steps per mm is the firmware variable to change.

Generation 7 Electronics	Teacup Firmware	RepRap DIY

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Dave in Spain

Re: Can I use a different z axis threaded bar finer than 1.25 pitch
October 19, 2013 01:15PM

Registered: 10 years ago
Posts: 8

Ok thanks if the m8 is accurate enough thats good thanks

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Dale Dunn

Re: Can I use a different z axis threaded bar finer than 1.25 pitch
October 20, 2013 08:54PM

Registered: 13 years ago
Posts: 485

M5 has been common to Prusa designs for some time now. It's a much finer pitch, but the nice part is that it's the same diameter as the motor shaft. You can make a coupler with just some tubing and zip ties. Being thinner, it's also less likely to contribute to wobble.