E
ExplodingPudding
Try using a different blade. If it's the 180 with 2 blades and case then I believe, if memory isn't failing me, they are segmented. Which can be a bugger for porcelain. Try getting a continuous blade as mentioned above. Give Rubi a call too if it still gives you trouble.
On a side note, don't ever use WD40 on the ND180. I've got two in the warehouse that are covered in muck from that being used to clean them. It will just make the dirt stick.
On a side note, don't ever use WD40 on the ND180. I've got two in the warehouse that are covered in muck from that being used to clean them. It will just make the dirt stick.