What should be material for T shape mechanism

[underthetire]

"within Microns" Well, thats open ended. 40 microns, 2 microns, 100 microns? I'm assuming you mean slide accuracy, not positioning accuracy. Our company has built some of the most accurate machines on the face of the planet, stuff thats hard to even grasp the concept. We are talking 10 million dollar projects in the late 70's. I will tell you that every one of the super precision slides was not only hydrostatic, temp compensated to .001 deg, Laser feedback for position, pitch, and yaw. I think you need to define your needed parameters a little better then go from there. Guides are good, air bearings are very good, and almost never wear out, and I've yet to see a hydrostatic way fail. This all means $$ and lots of support equipment.

[RICHARD ZASTROW]

There is no such thing as infinite. Unless other characteristics or unsuited materials are in play, hardened materials will resist wear better than those not hardened.

Lubrication to avoid or reduce wear is usually required. Even ball or roller bearings require some lubrication.

Hydrostatic, hydrodynamic or gas (air, nitrogen etc.) bearings greatly reduce wear by suspending the surfaces with a thin fluid.

The length of the moving member and the length of stroke may determine the type of rolling bearing if that is the bearing of choice.

The view or the description do not provide sufficient information.

Dick Z

[Zirok]

Hi

Thanks for the Support.

I want to manufacture 5000 sets of such Guideways.

I have 2 options -

1. TO MANUFACTURE IT INHOUSE - which is really notall easy & failure here will be end
2. GET READYMADE LINEAR GUIDEWAYS FROM MARKET - I am happy to say that i got very useful links of Manufacturers from you, BUT

=> My thirst of knowing REAL application of these Linear Guideways has generated. Can you please let me know the same ?
=>Also some documentary link about the function & design of Linear guideways would a Big Favour.


So, i can dive into the actual structure & design of the Linear Guideways & check out all the possible features it can provide me excluding sliding precision.

THANKS
Zirok

[Zirok]

Description-

A slider slides into a opening. The weight of slider is 1 to 1.5 kg & it is pushed upto 10mm against a spring & It will be operated once in a day.

Also wanted to ask you that can you provide me some documentary or the design, functional & applications of the following -

1. ball bearings
2. roller bearings
3. AiR Bearings

So, i will be in a condition to sort out the best from the 3 & than decide whether i should go for a readymade one or manufacture it.

Thanks
Zirok

[Zirok]

Hi,
Thanks for the REPLY.

As you say the ACCELERATION is of no sense we will assume that the
Force = 1 * 9.81 = 9.81N
So, accordingly mutliplying it by stroke will give the actual force

As, you seem a veteran person in Spring design, i would like to post another query about Spring Design -

As we know,

Max. Shear Stress = ( 8WD / 3.14 * d^3 )* Fmax


So to calculate the Min & Max stress in any spring, do we need to replace "Fmax" by the actual force ( Fmin & Fmax ) in the above formula to calculate the Max Stress & Min Stress. ?

Thanks
Zirok

[RICHARD ZASTROW]

www.ikont.com linear roller bearing slides, linear ball bearing slides, roller guides are all in this catalog.

Of course, there are many good suppliers of other brands. This just happens to be what I specify most often.

Dick Z

[emonje]

Max. Shear Stress = ( 8WD / 3.14 * d^3 )* Fmax


So to calculate the Min & Max stress in any spring, do we need to replace "Fmax" by the actual force ( Fmin & Fmax ) in the above formula to calculate the Max Stress & Min Stress. ?[/COLOR]

Thanks
Zirok

That's what the textbooks say, if you choose to neglect curvature effect (which is not that much I believe). But I don't have any experience in using this.

[Zirok]

So, which formula you use to calculate the MaX. Stress in any spring ?

[Lucanus]

Hi
I want to manufacture 5000 sets of such Guideways.

Ok lets see here...
Lets assume you only need 1 guide block and 1 rail with a travel of 1 meter.
You'r looking at a cost of about 50-75 $US each (and that's probably a gross underestimate).
That's between 250000 and 375000 $US.
A pretty decent chunk of change, especially given the nature of the OP.

Manufacture the assembly yourself:
That's going to require an investment many many times larger than the cost of buying them. Unless you allready have the machinery and staff needed. Not to mention a working and tested prototype. Which again, given the OP, doesn't seem likely.

As for the uses of linear guides:
They are too numerous to mention. You need to do your own research on the subject.
And as for how they are made:
This is a highly guarded trade secret. Companies like NSK aren't going to spend millions of dollars in R&D only to give it away for free.
If you want to find out how a linear guide block works, buy one, take it apart and reverse-engineer it. Alternatively, study pictures or drawings of them. It doesn't require a rocket scientists to figure out how they work.

It's nearly impossible to come with valid, real world applicable, information without knowing exactly what it is you'r trying to build.

At any rate, good luck with the fanta.. err.. project.

[RomanLini]

It will only be operated once each day, that's 365 operations per YEAR? And you are worried about it wearing out?

What is this mystical device that is pressed by a human hand once per day and needs to work forever? You have posted 3 or more threads so far, asking for help with the spring, the dovetail guide and now an ever-lasting micron-accurate hand pressed thing...

[emonje]

the formula you've written is for helical compression or tension spring as far I remember. For torsion spring, for example, things are different.

[Zirok]

Hi

Actually not looking for manufacturers & dealers of LINEAR GUIDEWAYS.

I am looking for some principle or theory material behind the working of Linear Guideway.

Its no sense to ask manufacturer the theory because they exaggerate it...(after all its a part of marketing ..)