Rostock Max assembly

[Lasivian]

Looking at the assembly guide it explains that the two circular plates need to be the same.

"The first parts you should check are the machine table (P/N: 63851) and the top support (P/N: 68368).
These two parts have three notches in them that the tower extrusions fit into. Make sure that the three
notches match as show in Fig 1-2 on the right. All three notches need to match. If they don’t, your
build will be slightly twisted and you’ll never be able to align the error out. "

[img]https://raw.github.com/seemecnc/Rostock ... fig1-2.jpg[/img]

The notches on mine do not match precisely. I need to know how perfect this tolerance needs to be.

Thanks

[geneb]

A photo that illustrates your issue would help.

g.

[Lasivian]

Well, yes and no.

#1 I do not have a camera with a flash or a macro lens to show what I'm seeing. And the parts are black on black.

#2 Just saying "the parts match" is not exactly precise. When things say "match" I think "exact".

Mine are off by 1mm in circular alignment and 2mm in the depth of the notches.

[geneb]

As long as the back or "inner" face of the notches match, you should be fine. The thing you're worried about is whether or not the towers will remain perfectly vertical when they're fully seated into the notches.

g.

[Lasivian]

As long as the back or "inner" face of the notches match, you should be fine. The thing you're worried about is whether or not the towers will remain perfectly vertical when they're fully seated into the notches.

g.

When you built yours were the slots an "exact" match? Just so I know.

Thanks

[Sandtoe]

Hi, I built mine in January and I sort of had the same thought. These pieces don't seem to match exactly and I am trying to remember if mine where off by 1mm or so. I think they may have been. It is the depth and not the width as there are more pieces to the top than the bottom. Couple of pics may help. You can adjust them a small amount front to back in the slots also to make sure they are straight up and down. Mine fit without much adjustment.

[JolietDelta]

When I built mine I encountered the same problem (see the pictures below).

I decided not to rely on the both plates beeing exactly the same, but on the heated bed beeing exactly 90° to the towers. This is ok as long as the circular alignment is right (which it was in my case).

Nevertheless I sanded the bottom plate (the one which had a slightly elliptical shape) to match the top plate. Just in case. :-)

Top/Bottom plate, matching side.

...and the opposite side.

Using a good bevel gauge which helps you to adjust the three towers to be exactly (!) 90° (and this in both, X and Y dimesion) to your heated bed, is more important than having exact matching inner faces of the both plates. IMHO.


~Jens

[geneb]

The towers should be square to the BASE, not the heated bed.

There's enough error in your plates that I would have contacted SeeMeCNC about it and asked if that was within tolerance.

g.

[JolietDelta]

Hey Geneb,

ups, my fault. Of course square to the base (my head was probably still in bed while I wrote my previous post).

I've contacted Smcnc and got a very quick reply from John. He confirmed my idea of putting the towers square to the *Base* :-).
So I did it this way. The result was good enough to open up a cold bottle of beer (one to remember, not one to forget) after the first print. :-)

Another reason was, that the holydays were in sight and so my "timeslot" for getting this project finished has been the limiting factor.

~Jens

[Toyguy]

Also, remember to rotate the plates against each other - there was one position on mine that was a much better match than the others. Once you find the best fit, mark it so you can assemble it that way. That said, I wouldn't obsess over it. As long as they square to the base in all orientations, you'll be fine.

[Jimustanguitar]

I presume that the "captive" or enclosed extrusion design of the Orion and the R3 eliminate much of the trouble with this. (manufacturing tolerances allowing, that is)

[geneb]

Yes. The square openings are VERY tight on all four faces of the extrusion.

g.