Design Lead Screw for CNC Machine - 48 Steps, 1mm Per Step

[crazybuoy]

Hello,

I am going to build a CNC machine and for that I need a lead screw. My stepper motor has 48 steps in one cycle. I want to make move 1mm per step and please make a CAD drawing so that I make this screw from mechanical workshop. Also please suggest me the software to build such design.

Thanks in advance

 

[Unrest]

Hello,

I am going to build a CNC machine and for that I need a lead screw. My stepper motor has 48 steps in one cycle. I want to make move 1mm per step and please make a CAD drawing so that I make this screw from mechanical workshop. Also please suggest me the software to build such design.

Thanks in advance

48 steps/rev * 1mm/step = 48mm/rev
So the pitch of the screw should be 48mm.

That's quite big! To what extent do you want to optimize the design? Maybe you can use multiple starts to reduce the diameter, or change the motor. Do you need to worry about backlash? With such a steep pitch it could be an issue.

You may not have to draw the complete screw. If it has a standard thread form you might be able to just specify it's properties. So the drawing may be nothing more than a cylinder with straight lines to show the threaded part. In that case you can use Paint instead of CAD :P

You can analyse it with hand calculations to decide the diameter/material/etc.

 

[pantaz]

Hello,

I am going to build a CNC machine and for that I need a lead screw. My stepper motor has 48 steps in one cycle. I want to make move 1mm per step...

Assuming "CNC" refers to a milling machine of some manner, that's an awfully large movement. Are you sure you don't want something closer to 0.01mm per step?

 

[Bob S]

Look at http://www.mcmaster.com/#acme-threaded-rods-and-studs/=cqc2my in McMaster Carr catalog.

Bob S

 

[Mech_Engineer]

You will definitely want your positioning system to be a lot less than 1mm/step. Try something closer to .0001" (.0025 mm) per step and you're in the ballpark for a CNC machine. Keep in mind that stepper motors can move quickly (thousands of rpm), so even with a high gear reduction you won't be limiting your speed very much.