Friday, 13 November 2009

Sloppy bearings :(

Josh has been using our new boring tool today, to bore the holes for the Igus bearings to H7 tolerance. First of all it turns out the cutting tool supplied is the wrong type, so the cutter is chattering and making a mess of the H7 finish!

Then when we do get one of the bearings in place, nice tight fit.. the 30mm anodized shaft also supplied by Igus, has about 0.1 to 0.2mm of slop around it. In fact the hole looks as though it is oval shaped, which we were told would be squashed into a tight round fit on the aluminium shaft once the bearing was pressed into an H7 fit.. hmmm, not the case! Hopefully we will get an answer from one of the tech. chaps at Igus next week.

Well I guess it is Friday the 13th!