max speed with lead screw

Hi folks,
just starting to plan the next machine but I'm thinking of using lead screws instead of belts this time.
What I'm wondering is is it possible to calculate the max speed based on weight moved,
torque of the stepper etc?


Many thanks.

Usually, it's the maximum step rate of your controller which is limiting the achievable speed, so a good point to start is this wiki page.

I like the motor sizing tools at Oriental motor's web site. You input your design parameters including masses, speeds, and acceleration and it calculates the motor torque required.

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Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]

Why leadscrews?
You got money to burn?


You may have to look at Multi-start lead screw.

Aluminatus 3D printer -- uses a PCB linear SIMO with multi-start screw.

PCB linear has design tools

Oh,
I was thinking of lead screws as i'm a bit tired of the pain in the butt belts
on the prusa. Paying a bit to avoid bed slips seems fair.

If your bed is slipping and the mechanical stuff is OK (pulley tight on motor shaft, belt tight), you're trying to print too fast or you've got the acceleration/jerk set too high. You can still get layer slipping using screw drive. If you try to move too fast the motor will slip.

The main advantage to screws over belts is the elimination of print artifacts like ringing. Screw drive is typically noisier than belt drive because the screws and bearings are pretty efficient at transmitting vibrations from the motor to the rest of the printer.

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Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]

Right
Prusa a real Rolls Royce of FFF printers using belts.


DD right
A little maintainence or upgrade on your Yugo
could make it a duce coup? ---- or a Chicken coop?

Cozmiray,
What! Are you saying the prusa isn't a revolutionary self replicating printer that is going
to end up in every home with people able to print their own meals? Well that's what the
advertising says. :p

Had a read and look at the aluminatus. Umm, i think the politest thing i can say is expensive.

I will have say that it is a real balancing act deciding belts or lead screws. Cost v simple etc.
If there was a printer that uses v slot with only lead screws i could look at, that would simplify
everything. Bodging one by mutating a corexy d-bot into a lead screw version is tempting.

Waiting for the youtube of a prusa making a prusa?

The Trinity Aluminatus was a neat idea --- lasted about 1 year
the designer / producer was crazy --- the business went under

He struck a deal with PCB linear to provide integral rail / leadscrew

[www.pbclinear.com]

Lots of pix here

[www.flickr.com]

A friend has three of them. working great

Linear rails the way to go --- DD turned me on to them
Even the cheep chinese ones (with a good clean up) are great

linear rail -- leadscrew combo may take some design ballet