8 hoogwaardige kunststof lagers



8 stuks Drylin RJ4JP-01-08 Kunststof lagers.

Deze ter vervanging en opwaardering van de bestaande stalen lineaire lagers. Dit als de armen nog niet gegroefd zijn geraakt, anders beter de set met glijarmen te bestellen. De Kunststof lagers hebben geen smering nodig.

Een informatieve post over vervanging door Levent is te vinden op het CraftUnique forum:

Veel is te voorkomen door de armen om de 50 printuren te oliën, maar uiteindelijk zijn deze onderdelen aan slijtage onderhevig en moeten vervangen worden. De kunststof lagers van deze set gaan echter vele malen langer mee, zodat u tijdens de levensduur van de CraftBot deze niet meer hoeft te vervangen.

In het algemeen kunt u de vervanging zelf doen met enig technisch inzicht. N.B. de lagers zijn geborgd in de behuizingen middels een inbus boutje, deze uiteraard losdraaien bij het verwijderen. Bij het weer samenbouwen na vervanging van de armen en de lagers telkens per onderdeel zorgen dat deze goed gesteld zijn en over de gehele lengte soepel lopen.

The most important finding the first time I tried to exchange the bearings: they are not press fit in the aluminium block. There’s a tiny grub screw that holds them. Loosening it is making it possible to press the bearing easily out and in. Make sure that grub screw lines up with the groove in the bearing.

Also: it’s important to realign the bearings again when fastening the new ones. I found it absolutely necessary to dismount the timing belt to be able to do that. When they are: just fasten each set of linear bearings with that grub screw and keep feeling if they slide without resistance when moving the extruder mount over the complete length of the smooth rods.  The X has to be perpendicular on the Y movement of course.

The smooth rods sent are more hardened than the original ones, and slightly thinner. That makes the plastic bearings glide nicely. Formally it’s not needed to oil those plastic bearings, but it couldn’t hurt either IMO.

  • the lineair bearings are hold by a very tiny grub screw. I discovered that after I tried to hammer the bearings out of the pillows ;-)
  • when assembling again you have to make sure all movements are smooth on all spots. I discovered that it’s only possible to allign the bearings and rods again by taking the timing belts off. The tension of them prevent a good adjustment of the rods and bearings.
  • After all having assembled (including the extruder) you can mount the timing belts again.
  • Although the bearings are meant to work without oiling: I still apply a little to make them slide easier.


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