Re: drill rod quality

Hi Vajk,

I did a google search and foound this link.
http://www.westyorkssteel.com/Steel_Specifications/ssintstd.htm

What this link shows is that your material
X5CrNi1810
is the same as what we in the US call 304 Stainless steel.

Your question is if this is good for linear rails can be answered
with a little more information.

First, most stock has some tollerance for straightness. a 1 inch
shaft of 304 stainless will have a listed tollerance of straightness
of as much as 0.015" per foot. This means that the raw stock could
have a slight bend.

Second, raw stock, unground will have a finish that is not smooth
enough for good movement and will wear quickly.

Ground stock such as drill rod will have a better tolerance in
straightness and will also have a very good finish. A ground OD of
this material will be a fair choice.

I am about to use drill rod for a simple router to test the
suitability for a bunch of parts I need to make. if it works very
well, I will use it as it is. If it works, but the cuts can only be
very light, I will give the unit to my brother in law for his wook
routing needs and I'll move up to linear slides.

I selected 1 inch by using the spreadsheet in the files section
http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/BEAM%
20DEFLECTION.xls

or BEAM DEFLECTION.xls in the files section if the link does not work.

A note about bronze bushings, is that they often are lose +0.001 or
so. That means the shaft will easily slide. For thight tolerances
and no vibration you might want to bore or reem undersize bushings up
to the exact size you need. The tighter your tolerances, the less
play and the less error and less vibration.

Hope this helps.

Dave

--- In CAD_CAM_EDM_DRO@y..., "halaloszto" <halaloszto@y...> wrote:
> hi experts,
>
> i am about to make the first step to build my egraver/mill, and as
i
> have _no_ background in machining or mech. eng. i would ask some
> dummy questions a few times.
>
> it was hard to find where to but the "drill rods" for the guides,
> finally i have found a company, that sells in small quantities, and
> is willing to cut it to pieces for me.
>
> this is the string they gave me about the material the rod is made
> from:
>
> 1.4301
> X5CrNi1810 (másutt: V2A)
> 304 <- they told me this is the US name/code for it.
> KO 33
>
> could someone tell me, if this rod will do with bronze bearings for
> my first machine?
>
> it is some kind of stainless steel, also called austenit (or
contains
> austenit)
>
> sorry for the very beginner question.
>
> vajk