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Press fit hobb spinning in large gear
Closed, ResolvedPublic

Description

We have seen a few instances where the press fit of the knurled hobb shaft does not hold in the plastic gear.

Event Timeline

kent created this task.Aug 17 2018, 1:14 PM
kent triaged this task as Normal priority.
MikeR added a subscriber: MikeR.Aug 20 2018, 11:51 AM

I have had 2 RMA's with this issue. RMA 12258, help desk 178259. I can not remember what the other RMA number was.

kent added a comment.Sep 18 2018, 11:13 AM

Had this issue on RMA12343 causing a failure to extrude on the right nozzle.

RMA 12379 had the same issue. The left side (E@) knurled hobb was spinning in the large gear.

RMA12448 had this reported issue.

kent closed this task as Resolved.Nov 13 2018, 9:27 AM

We received the parts made to the new drawing today, and I tested them with some of the gears that had holes on the larger side and they work.

Here is a control chart with extrapolated hole diameter and the knurl diameter.