Altmill Z Screw

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1

Well, my project material came loose during a vortex rotary carve. The material bent the Z axis screw on my Altmill 4x4 with spindle. Tried to order through Sienci but the photos won’t upload to the ticket. I sent in a note for some help.
Question for you guys is “ is there another source for the Z axis screw, that you are aware of?
Looking around on Amazon and other sites, there are many options. Any assistance of sourcing a replacement would be great. Need a replacement until I can get one from Sienci.
Got a hot project with a short deadline. Thanks

2

According to the OnShape document the ball screw is a SFU1204 300mm ball screw. The 1204 is 12mm in diameter with a 4mm pitch.

I don’t have any recommendation for a brand but that might help you get something compatible. The OnShape is for the Mk2 but I checked and the AltMill Mk1 uses the same Z ball screw.

I should add that I’ve never used a ball screw before. I think the nut can screw all the way off the screw shaft but I’m not positive. If so you should be able to put the Sienci nut on the new shaft.

3

It is my understanding that a ballscrew nut is matched to the screw. Not only that but unless you take proper precautions, when you take the nut off the screw you loose the balls.

4

Thank you guys,
Found this on Amazon ; *# 300mm Ball Screw SFU1204 RM1204 with Nut (End Processing) Precision Part for CNC Machine

What is your thinking on this one? Gotta get through the weekend.

5

Thanks, that was the part I was unsure of. I hate it when all the little balls fall out!

6

That one looks right as far as I can tell. They don’t have any dimensions on amazon for the nut to make sure but it ‘looks right’.

7

Aww cmon, who does not like the magical fairy sparkles seemingly suspended in the air right before a pirate’s baritone blasphemy shuts the gates to walhalla for everlong.

They are shiny, and bouncy, and happy to go free. If that’s no delight then how gloomy you must be!

Arrrrrrr

8

Thanks for the assistance. Going to wait for a new assembly from Sienci. Nursed it through and finished that project.