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Carriage spacers for the R2

Discussion in 'Mods and Upgrades' started by Lance Weston, Mar 9, 2020.

  1. Lance Weston

    Lance Weston Active Member

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    I purchased an R2 from eBay. It was obvious it had never been taken apart but the rod wear was terrible. I ordered new hardened rods and put in new bearings, but the wear was still terrible on the rods. I examined the spacers and found that the belting was not perfectly placed. The R2 spacers had many different lengths and no combination gave me perfect belting placement. Not having the carriage drawings I made some assumptions an printed out spacers. I only needed three different lengths.

    The first spacers I posted were impossible to read and I have changed what is printed on the spacers themselves. U: top, D: bottom, R: right, L: left, F: front, B: back. Makes it real easy to re-assemble and everything lines up perfectly, to my eye. The print head now moves very freely. I have trimmed the lengths slightly.

    I had to repair a carriage assembly as the screw holes for the steppers were to cracking. Carriage pictured has the repair spacers glued in. I will post the repair when it is finished along with pictures including the spacers.
     

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    #1 Lance Weston, Mar 9, 2020
    Last edited: Apr 5, 2020
    supercazzola and mark tomlinson like this.
  2. tkoco

    tkoco - -.- --- -.-. ---
    Staff Member

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    Images, please.
     
  3. Lights

    Lights New Member

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    Hi

    Can you say more about that brackets holding smaller rods? It is better thean the original?
     
  4. Lance Weston

    Lance Weston Active Member

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    My original brackets broke, the replacements broke. I bought a used R2 and it's brackets were broken. These brackets will not break. They do not use springs on the belting which stretch during acceleration and give inaccuracies. My brackets use open loop belting which you can make as tight as you like. My brackets secure the 6mm rods so they are unable to drift.

    The disadvantages: They are not an easy install. They require a hole to be put in on either side of the carriage for the 6 mm rods insertion. If the print is not well done then the sleeve bearings holding the rods need to be adjusted. If the rod does not slide directly into it's mating bracket a 6mm reamer ( or "A" drill bit ) has to be used to adjust the sleeve bearing. The rod must be inserted from each side to verify lineup. You loose 2mm of bed width because the brackets are wider.

    The advantages: They will never break, there are no springs, and it will let the 6mm rods move slightly to compensate for the 8mm rods not being perfectly parallel, because the 6mm rods are only fixed on one side. The rods are now not held by just a point on each side. They run through a 10 mm long bearing on each side so are stiffer holding the head.
     
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