Step 4 Router and Brass

[Trispectiv]

Well, according to the photo I found after searching the name of the router, the manufacturer shows it with a Kress mounted on it already. So I expect it should handle the weight of the Kress just fine.
(en.step-four.at/hp2/index.php?action=1482)

[Leadhead]

Aha! I have never noticed that! I even have that sheet pinned on the workshop wall! So need no more reassurance. Thank you!

Mine is an older machine and was fitted with the small Proxxon as standard. I bought this machine a while back and have not given it much attention until now.

[Trispectiv]

For the current version on their website, I see no spec about the stepper motors. They are also covered by a case, so I can't roughly estimate their capabilities upon their size either. However, it doesn't take a lot of torque to move the Kress around, I would rather worry about the deflection of the 16mm hanged rods instead. Since you already have Kress mount in production, the only way is forward :)

[Leadhead]

Hello again - Here is photo of the units. As you will observe. I doubt if this size Kress was ever standard on this machine.
But I stand to be informed

[Trispectiv]

Well, your router looks different from what they show on their website at this moment. If those are 10mm smooth rods, there will be quite a lot of flex. Also, Nema17 in the 0.3Nm range I suppose, will have a hard time pushing it around. But like I said, since you are half-way through already, you will have to mount it even just to check how well/bad your axes coop with the Kress weight.

[Leadhead]

The rods are 12mm dia. I have lightly clamped the Kress to the head and it runs around nice and smoothly. I checked the central deflection on the rods and there is a "no cutting load" movement of 0,03 mm. For what I am doing I think it may stand a chance of being OK.
Will post again once cutting is possible.

[Trispectiv]

Yes, unsupported rails will inevitably have a certain amount of deflection. If the engraving you are doing is rough enough to match those tolerances, it should be fine. Light cuts also reduce further deflection when the engraving bit will meet the workpiece.

If you have access to a decent lathe, you could craft yourself a spindle out of a brushless motor for engraving purposes.