Dear Kenis san,
Formal report will be sent during the next week.
Send back sample and the result of comparing the stock, abnormality was not found.
Strength, elongation because there was enough, thought to be caused by a sudden load of time to be attached to the machine base.
It is to cause cracking,
1.At this time, the factors that apron cracks is considered the following two points.
(A)To set the apron in a short period of time at the time of the threading work.
(B) If the rotation of the apron roller is bad for some reason.
・ Immediately after grease-up is due to the high viscosity of grease, it is more likely to break in the same way.
・And loss and of bearings, and scum is mixed into the bearing, rotational resistance will increase. At this time,
the apron, which is pressed against the drive rotating shaft takes brake even as you go around at high speed,
the apron is cracking.
2.If (A) is the cause, by slowly set the apron, cracking it will be eliminated.
Even if grease viscosity of (B) is the cause, by setting slowly the apron, cracking it will be eliminated.
If the bearing rotational resistance of (B) is a cause requires maintenance of bearings.