[rodjava]

Hi,
Could somebody please tell me the type of screw this is? Just the basics would be fine.
Thank you in advance.

Rod

[Jason3]

Looks like a 2 start ground ball screw, perhaps a Star or Rexroth?

Regards,

Jason

[brihoo2k]

It looks to me to be a single start ball screw.

[SORCHEROR]

its a rolled single start ball screw

[rodjava]

Thank you to everybody that relied so far. I looked up in Wikipedia the difference between single and double start :

Single-start means that there is only one "ridge" wrapped around the cylinder of the screw's body. Each time that the screw's body rotates one turn (360°), it has advanced axially by the width of one ridge. "Double-start" means that there are two "ridges" wrapped around the cylinder of the screw's body. Each time that the screw's body rotates one turn (360°), it has advanced axially by the width of two ridges

I'm not quite sure from my picture how many ridges are shown.

Again, thank you all in advance for your help.

Rod

[mactec54]

Hi rodjava

No you can not tell how many start that screw is by the photo, most ballscrews only come single start, If you get a photo of the end of the screw you can see right away if it is a 2 start or not, the screw in the photo does not look in to good a shape as well,email me if you need more help with this

[andyb4]

It is a single start. If you draw a line perpendicular to the axis of the thread, say from the groove in the bottom of the thread, it will be half way between the groove you can see coming down from the top, and the next one. If it were a two start thread, the line would intersect with the groove at the top side of the picture. Each "thread" is every other crest.

[rodjava]

Thanks again everybody for your help.

I will call it a single start ball screw.

We can end the thread now, unless somebody has an opposing view.

Best regards,

Rod
San Francisco