single rail - linear ballscrew design help required please

[damunk]

Merry Christmas,

I have a question to which hoping someone can answer please.

Is it okay to use a single 20mm rail for ballscrew linear actuator?
The rail is a cylinder bearing rail. Ones you can find easily on ebay.

The travel is not much and the load will not be much.

The travel is 500mm and the load will be 65kg. It will be pretty fast speed.

The plan is to use single rail and also a 100mm long table mounted linear block support which will help guide the actuator rod through and finish off with a small Linear Flange Mount Shaft support:

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[awerby]

If you're talking about building a linear actuator from scratch, first check around to see if you can't find one that's pre-built which meets your requirements. They often go for less than the components in them do separately.

[damunk]

If you're talking about building a linear actuator from scratch, first check around to see if you can't find one that's pre-built which meets your requirements. They often go for less than the components in them do separately.

Thanks for the quick reply Andrew, I did some searching and problem is the ones that you can readly buy seem to have low vertical and horizontal load ratings,

I beleive this is not to due the bearings actuator bars etc but it is due to the fact they use those cheapy aluminium bases/frames?

I had planned to use a steel base plate.

Is this why they are not strong because of aluminium being used.

[awerby]

I looked at ebay UK and saw the actuators you refer to; they seem to all be the same, but they're not the type I meant. Aluminum extrusions work fine as a structure for them; I think their weakness is due to .the type of rails used - the ones that showed details seemed to be based on V-rails and wheels. What you want are ones that use profile rails and bearing trucks, like this one: https://www.ebay.com/itm/NSK-Origin-...lsz0:rk:3:pf:0