Carriage Adapter Suggestion for Rostock Max

T3P3Tony

Saffi, did you end up drilling out the carriage adaptop PCBs? do you have a picture of how you mounted them in the end? Looking to get more made and will add appropriate holes if it does not affect the rest of the carriage adaptor.

MiR

I designed an adapter in Fusion360, perhaps it is usefull for others:

http://a360.co/2f2man2

There's no need to change anything on the effector, the screw holes for the ball-heads are used to connect to the adapter

Michael

T3P3Tony

Hi Micheal

Thanks for sharing your design. For the carriages adaptors (not the effector) I was looking into adding two more holes so that an further adaptor would not be needed for the rostock max.

T3P3Tony

@PlasticMetal:

Per the files on github, the carriage ball joint holes are 24.125mm center-to-center, and 6.35mm inner diameter. They use a #4 screw to mount to the bosses.

~~Pondering this a bit, would it be best to have the adapter plate holes large enough to pass over the bosses? Otherwise the barbell arms will be able to shift around.~~

Edit: I got off track there, thinking of how to mount the ball joint arms (with barbells) to the adapter plates, rather than the OP's question of mounting mag arms to the SeeMeCNC carriages.

https://github.com/seemecnc/RostockMAXv2/tree/master/CAD_FILES

The barbells are 70855 Carriage Ball Joints; mounting side of the carriage is 70852 Carriage Inner.

Thats helpful, any idea of the tolerances on these Rostock injection molded carriages. I want to make the holes as tight fit as possible to reduce any miss alignment

Sakey

I've just printed some adaptors for the Rostock. I'll upload when I'm at my pc.

Download the STL:

https://drive.google.com/open?id=0Bxtr4ocyxEMsMks0bUxEay1YYXc

T3P3Tony

Cheers!

dc42

@Sakey:

I've just printed some adaptors for the Rostock. I'll upload when I'm at my pc.

https://preview.ibb.co/gE2S4F/DSC_0895.jpg

Download the STL:

https://drive.google.com/open?id=0Bxtr4ocyxEMsMks0bUxEay1YYXc

Would it be sufficient to drill two additional holes in the PCB, one either side of the centre?

Can you give us the spacing between the holes, and the size of the screw that goes through them?

Sakey

I'll measure up when I get home tonight but I think its a 3mm screw with a flange. It will work drilling two holes but I don't know just how stable it will be.

dc42

Thanks. Why might drilling two holes be less stable?

Dougal1957

@dc42:

Thanks. Why might drilling two holes be less stable?

Looking at the photos I think that they use a spigot for the Barbell to locate on and then the screws just to hold in in place. I think with just the 2 mounting screws in the middle whether the carriage would have a tendency to rock causing hight variations.

Sakey

@dc42:

Thanks. Why might drilling two holes be less stable?

It might have the potential to rock as mentioned as Its only secured in 1 plane. Just a passing thought really. I'm pretty sure it will be OK.

PlasticMetal

The holes could be large enough to fit over the bosses, and a small block could be printed to fit over the bosses. It would be tall enough to just slightly raise above the bosses with the adapter plate in place, so that the screws (with washer) would sandwich the adapter plate in place.

Dougal1957

yes I think that would work and in fact the adaptor plate could be quite large so as to stabilise it all

Sakey

So Dimensions are as follows,

Holes are 22mm centre to centre
Spigot is 6.32mm
The screw holding it is a 3mm self tapping screw with 8mm washer on

dc42

So we should add two 6.32mm holes spaced 22mm apart horizontally. Can someone else confirm these dimensions? We'd like to get a good fit so that the carriage adaptor is horizontal automatically.

T3P3Tony

I downloaded the Model file that PlasticMetal linked to and confirmed the dimensions:

24.125mm center-to-center, and 6.35mm inner diameter

TwoTone

@saffi:

I'm not sure if these are all the same spacing, but the ball cup axle fits on two screws mounted to the carriage.

First two photos are the version 3 Rostock (the trick laser carriage as well) and the last is perhaps the v2 that didn't use ball cup joints.

https://imgur.com/8iOzxYZ.jpg
https://imgur.com/WE6CjT0.jpg
https://imgur.com/KZxVUOv.jpg

Just a correction as the later V2 came with the upgraded ball cup arms.