02-22-2018, 10:42 AM
Hello,
i found this on shapeways: <!-- m --><a class="postlink" href="https://www.shapeways.com/product/W3DXYSKH5/ho-gearbox-case-0-3-mod-single-idler-1-8-quot-axle?optionId=63913844">https://www.shapeways.com/product/W3DXY ... d=63913844</a><!-- m -->
It seems the real problem is in their new mold for gear boxes.
![[Image: dsc001275vu8j.jpg]](https://abload.de/img/dsc001275vu8j.jpg)
Several times i had issues with this type of NWSL gearbox casing. Even when all flash was removend and cleaned up, this was not a simple screw together job.
Sometimes the fit was too tight, so that the worm shaft was barely turning over by hand. The reason were too thick washers (the two who come with the gearbox), so that i had to replace them with thinner ones. Next issue was the halves would'nt fit properly together, a gap of about 0,5mm remained on the upper side, because the bore for the bearing bushes was too small in diameter. Thus causing an incorrect mesh and this again causing an intensified noise.
All these described issues above led me to a reasonable suspicion. The gearbox mold was made without correct consideration of the degree of shrinkage.
The gearbox casings came out of the mold simply a little bit too small.
my 2 €ents
i found this on shapeways: <!-- m --><a class="postlink" href="https://www.shapeways.com/product/W3DXYSKH5/ho-gearbox-case-0-3-mod-single-idler-1-8-quot-axle?optionId=63913844">https://www.shapeways.com/product/W3DXY ... d=63913844</a><!-- m -->
It seems the real problem is in their new mold for gear boxes.
![[Image: dsc001275vu8j.jpg]](http://abload.de/image.php?img=dsc001275vu8j.jpg)
Several times i had issues with this type of NWSL gearbox casing. Even when all flash was removend and cleaned up, this was not a simple screw together job.
Sometimes the fit was too tight, so that the worm shaft was barely turning over by hand. The reason were too thick washers (the two who come with the gearbox), so that i had to replace them with thinner ones. Next issue was the halves would'nt fit properly together, a gap of about 0,5mm remained on the upper side, because the bore for the bearing bushes was too small in diameter. Thus causing an incorrect mesh and this again causing an intensified noise.
All these described issues above led me to a reasonable suspicion. The gearbox mold was made without correct consideration of the degree of shrinkage.
The gearbox casings came out of the mold simply a little bit too small.
my 2 €ents