Page 1 of 1

Z Axis linear bearings

Posted: Fri May 29, 2015 9:03 am
by Honk
I have just finished changing my X and Y linear bearings and am excited about how much better things are running. I am going to re-build my Z axis because raising and lowering the table can not go fast enough to run PL 3D successfully. I plan on running the stepper motor with a timing belt to the lead screw as vertical space is limited. My question is: What would be a good ratio between the stepper motor and the lead screw? There are many different designs and ratios of DIY Z Axis on the internet. Right now it is an option as all the parts are just a big pile of bearings, belts, sprockets and motors on my work bench. I notice on Jeff's' pictures that he has machines with both geared and direct 1:1 ratios to the lead screw.
What do you think???? :?) :thinking)
Thanks Jerry

Re: Z Axis linear bearings

Posted: Fri May 29, 2015 1:19 pm
by Picengravertoo
Hi Jerry,

Whatever ratio you use, try to keep the steps down enough so the Z axis movements does not effect the overall blended feedrate.

What pitch is your Z axis lead screw that you will be using?

Jeff

Re: Z Axis linear bearings

Posted: Fri May 29, 2015 2:16 pm
by Honk
Hay Jeff
It is 5 MM about .2 in. I think. China can surprise me.
Jerry

Re: Z Axis linear bearings

Posted: Fri May 29, 2015 6:31 pm
by Picengravertoo
Jerry, I would try a 1 (stepper) -2 (Z axis) ratio. You want the Z axis to move faster with smaller movements from the stepper as long as it has enough torque. That will keep your steps per setting lower.

Jeff

Re: Z Axis linear bearings

Posted: Fri May 29, 2015 7:41 pm
by Honk
Thanks Jeff
I'll give it a go. I'll let you know,
Jerry