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Thanks to Mike, Rich and Ken for their very helpful information. The edge was parallel to the markings and when it isn't or has been sharpened past that point it does create a wedge on the primary facet but not like the one I received which appeared wider and longer. I even tried varying the edge angle anticlockwise and clockwise and the wedge was replaced with a wider parallel sided edge when the edge lined up with those extra diagonal lines on the jig. The point angle was about 120 deg and I tried that and 118 to no avail. Increasing it towards 130 deg actually made it improve.
  Following the advice I set it at 120 deg and tried a 7 deg jig angle as this seemed to involve removing the least metal. I sharpened the whole tip into a primary facet first then changed to the secondary.  I did get a 4 facet point as in my photo not as good as usual but still satisfactory. A valuable lesson and I will experiment with the other drill bits.
Cheers John

Thank you Mike. Will give that a try. The bits that are doing it all look similar so I might have bought them as a job lot? Cheers John

hello all. Please see attached picture of a 8mm drill bit with my attempts to sharpen it with my T8. The primary facet comes out wedge shaped and the secondary starts some way around the circumference and not at the bottom! I have done several bits successfully with my new T8 and also previously with the BGM-100 but a few previously unsharpened bits end up like this. I have tried all the variables with no luck so at a complete loss. Any help would be much appreciated regards John

 

   It is possible to cause error to be introduced into the grinding due to improper pressure being placed on the attachment. If too much pressure is placed on the front of the drill bit holding fixture, flexing of the attachment can occur. Most is probably actually occurring in the slide areas. There may be a slight flexing of the USB as well.

Hi Everyone, I have just purchased a DBS-22 and have also noticed quite a lot of play between the attachment and the mounting plate. What seems to happen the rubber strips can be compressed on one side or another causing a change in angle of the drill bit. This becomes more noticeable the smaller the drill bit. As I'm sharpening I have to be very careful to keep the attachment stable as I go back and forth across the wheel.

Could Tormek replace the rubber with some ball bearings perhaps? (metal filings might be the reason they havent already?

Cheers John