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Topics - OnealWoodworking

#1
I recently went to use my new SB250 stone and want to ask a few questions about the 'out of the box' trueness that you guys see with your new stones.

When looking at the front of my Tormek while the stone is spinning it is dead flat on the top and right side surfaces. Flat enough that it is not worth getting out any tools to measure runout...  ;)

The left side surface of the stone is jacked beyond belief and is going to need a lot of work to make true. It has a VERY noticeable wobble on that side that makes using it for flattening darn near impossible as it is.

My factory Tormek stone was (and is) perfect on ALL sides which leads me to think that this SB250 is not 'normal' for a new and 'out of the box' Tormek stone.

FWIW - I do know how to properly change stones and did remove and reinstall a few times whilst checking for errors along the way... This is not an improper installation issue. The left side of the stone is simply not even close to being true as you get closer to the outside edge of it. The center must be right as rotating the stone 180deg changes nothing - The left side still wobbles like hell towards the outside (away from the center) while the entire right side of the stone rotates perfectly flat to the eye no matter how the stone is turned on the shaft... Right side is true to the point that it does not 'need' any sort of measuring or trueing at all no matter what gets rotated... Smooth as glass it is.  :)

If I take measurements on the left side of the stone where it comes closest to the frame of the machine as it turns I get measurements like this:






I used simple feeler gauges between the stone and the frame of the machine on that left side to show what is obvious to the eye as the wheel turns while in use. Thickness of feeler gauges was measured with a good micrometer.


Can you guys share some experience here and offer any advice or experience pertaining to how you go about 'trueing' the sides of your stones?

What do YOU see when first using a NEW Tormek stone as far as trueness is concerned?


This particular stone will be closer to 1 and 15/16 (or less) when it is 'correct'. As it sits now it is 2" at the widest (and a shy 1 and 15/16" at the min) but still needs a good bit removed from the left to be correct...

My factory stone is perfect and runs true (to the eye and feel) everywhere. Not worth measuring any runout on it at all in my opinion. This SB250 cost me more than the factory stone would have and runs warped on one side...