Recall that early reports of the CBN wheel I received was excellent. Look how straight this grind was and how fine the micro bevel could be made ..
Article: http://ift.tt/1DGspyi
After several weeks I have noted that the wheels are no longer grinding a straight edge when using the Tormek BGM-100 toolrest. It is now wavy …
The wheel looks fine with a Starrett straight edge across the face ...
On examination, using light, I have noted that the face of the wheels is not flat but concave (curves inward) ..
This is the 80 grit I purchased on eBay, but the 180 grit from D-way is similar.
The wheels continue to cut as strongly and cleanly.
I have checked and re-checked the tool rest, removed it, replaced it … the result is always the same: a curvy or radiused edge. One can get past this if freehanding on a simple tool rest, but not when the blade is guided by the BGM-100. I tested the toolrest and blades on the Tormek, and the result was a perfectly straight grind. Clearly the concave on the CBN wheel is the problem.
It may just be that I am using wheels with radiused edges and the CBN wheels with straight faces are not affected. I am looking into this at this time.
Regards from Perth
Derek
Article: http://ift.tt/1DGspyi
After several weeks I have noted that the wheels are no longer grinding a straight edge when using the Tormek BGM-100 toolrest. It is now wavy …
The wheel looks fine with a Starrett straight edge across the face ...
On examination, using light, I have noted that the face of the wheels is not flat but concave (curves inward) ..
This is the 80 grit I purchased on eBay, but the 180 grit from D-way is similar.
The wheels continue to cut as strongly and cleanly.
I have checked and re-checked the tool rest, removed it, replaced it … the result is always the same: a curvy or radiused edge. One can get past this if freehanding on a simple tool rest, but not when the blade is guided by the BGM-100. I tested the toolrest and blades on the Tormek, and the result was a perfectly straight grind. Clearly the concave on the CBN wheel is the problem.
It may just be that I am using wheels with radiused edges and the CBN wheels with straight faces are not affected. I am looking into this at this time.
Regards from Perth
Derek
Warning about "radiused" CBN wheels
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