Re: Z rods

[Antonio Santos - Brazil]

Hello Mark!

I switched for 8mm stainless steel rods seven months ago.... no
problems and no corrosions so far... Its great...

Cheers!

Antonio Santos

On 6 jul, 14:07, Mark Cohen <markcoh...@gmail.com> wrote:
> Hi,
>
> So I am building a Mendel and needed to source the threaded rod. So I
> took a look at the Makerbot parts list and saw that we are using part
> number 98861A080 from McMaster for the Z-rods. I ordered 8 (1 meter)
> and cut them and assembled my Mendel. Since it was just sitting around
> for a few weeks while I worked on some other things, I noticed it
> start to corrode. These rods are plain steel and so will corrode. On a
> Mendel the frame and Z rods are made of these. But you would really
> only oil the rods and not the frame as that would be messy. These are
> the same as the Z-Rods in the Cupcake and so those will corrode also
> unless kept well lubricated. But still, unless this part number is
> incorrect then they will corrode at some point. I replaced the rods in
> my Mendel with part number 90024A080 which is stainless steel. It is
> nice and shiny now and my Z axis in the Mendel no longer binds even
> without lubricant. I will be ordering 2 of these 1 meter rods to
> replace the ones in my Cupcake as I have to frequently lubricate them
> and I noticed black stains on the rods where the nuts go up and down.
> Although I am having no problems with binding on the Cupcake, I think
> these will work out well. I'll let you know.
>
> Regards,
> Mark

[Peter Charles]

I use the 8mm stainless fine thread (1mm pitch) for my CupCake. No problems so far, except for Z axis correction for rotational/linear differences.

peter

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[Peter Charles]

Mark-

Yes, you do have to replace the nuts and recalculate all of the Z-axis movements.  But it is just a single coefficient that needs to be changed. Even though they are 303 stainless, I still lubricate them with way oil. Don't like to have unprotected metal.

peter

On Tue, Jul 6, 2010 at 1:29 PM, Mark Cohen <markc...@gmail.com> wrote:

Hi,

 

I think mine would be an exact replacement for the original ones. I wouldn’t want to have to make any adjustments. I would then have to change the nuts also I think.

 

Thanks for the info!

 

Mark