Well here goes... Aluminium frame router design

[Lee Roberts]

I used a mic, but only a quick check and I may of been a bit over on the pressure, I was more bothered about dropping it in the swarf! I will measure a good one tommorow and get back to you, cheers. Do you think having one ball missing could cause the notchy tight fit? I'm thinking about removing all the balls and giving it a good clean incase the missing ball is actually in bits causing the notchy feel. Good idea or not? It doesn't look too hard, just a bit time consuming.

OK nps.

Well yeah I would seems silly not to at this stage, like you say not difficult just a time thing, may as well do it now and rule it out then revisit.

I doubt it's a ball gone to bits in there, more likely to be something else got in, check the returns and any paths the balls take for damage, lumps and bumps things like that.

I just rebuilt two ball nuts for someone and on one of the nuts, a plastic return was just a little bit snug as the balls passed through it, the symptoms where a slight judder/nock as the nut was spinning on the screw.

If you know what brand/make and model we may be able to look up the right size ball.

.Me