Help Please for Moving Gantry

[Nr1madman]

Thanks for the Video and I watched it long back, planned to mAke similar one with less in size because of grinding and milling can need on z axis.
anyway here are some questions
I need size of rails and screws

For z axis 20mm linear rails can be ok?
and lead screw how much size should i take?

sample one here https://www.ebay.com/itm/Z-Axis-Line...wwW4n38Qfo6T7g


for x and y axis should i increase 20 to 40mm?
also the same lead screw sizes as the weight would be more sometimes.

First i am going to buy these two things then build the base since these are available in Our local stores.

Waiting for your answer and the size of the base would be 31 inches into 31 or 35 inches sine I dont need the biggest onE presently.

Hello again!

That ebay link is for a lead screw with 8mm thickness.. it's not nearly enough.
It probably would work for a machine made in MDF for sole purpose of machining plastic or something like that.
Not for steel construction with high weight.

Most people use ballscrews with 16mm diameter with your size machine.
Leadscrews have bigger backlash and more wear that ballscrews. And they require bigger motors.

When you say 20mm rail. What type of rail are you looking at ?

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