Dent Row
Weld spatter (spurious metal particles left after welding, which do not form part of the weld) does not form a straight line....they are rather spurious adhesions around a weld...rather like spitting fat in a hot frying pan. So this is not "weld spatter."
For the dent row to have been formed by a female die feature then the beading "valley" of the die would have to be filled by some material...and in a straight liine across several valleys. I cant see what that could have been caused through....unless there was an erroneous weld strike across peaks and valleys in the female, but the peaks were cleaned off, and the valley left. Thats just possible, I'll concede, but unlikely in my opinion)..
From Dave's picture it appears that the dent row feature is also visible as a sunken feature on the underside of the frame (maybe DM can confirm this when he fets the frame)...If this is correct, then it means that the weld strike theory on the female must be brought into question. How can the male and the female have exactly the same weld defect in the same place (but in negative).
We know that "draft angles" in a die (the angle of a sunken feature) are important ; if the angle is too severe then the forging will stick in the die....is it possible that this occured and the buckling is as a result of the release process ?.....OK.. maybe stretching a point, but not impossible, but unlikely I'll agree.
I'm sorry to keep thrashing this point, but if the male die was the "hub" and the hub was repressed into the die to reform the female during the repair process that produced the "B" type female, then features in the male will logically re-appear in the modified female. Any impact damage on the male would appear as indentations on the beading peaks, creating raised features in the valleys of the female, and therefore indentations on the beading peaks of the forged frame...as in the dent row.
(its hard to visualise this, I know...).
What does all this add up to in the context of this thread ?....quite honestly, I dont know. however the feature was caused, I expect that it would wear in the same way that the rest of the die would wear. It would also reflect the overall crispness of the cold forged frame. Where the dent row is poorly defined the overall frame crispness seems to also be less well defined....overall die wear, or merely less stamping pressure ?
But taking up Dietrich's point...who knows what the timeline is....Detlev clearly believes that 3R period 800/4's marked RK's of the "B" type exist. We have convincing evidence (for me and many others) of 935/4's being period...beyond that at the moment we dont know.
Yes...dies would have been polished and cleaned prior to each run....but then why would the frame that Dave posted show a well defined dent row, and lots of other problems (correct me if I'm wrong Dave/Dietrich) ?
Sorry...I've got no answers. But I wouldnt buy a "B" type except the 935/4. But if I already had one, I might just choose to hang on to it and await developments ! as Skip did with his flawed "A" type that many discounted as a post war copy....who knows the missing link just might appear !
But arent we getting rather off track here....Dave postulated that the ring on the frames were reworked to eliminate the dipping effect....what is the concensus on that theory ?
Weld spatter (spurious metal particles left after welding, which do not form part of the weld) does not form a straight line....they are rather spurious adhesions around a weld...rather like spitting fat in a hot frying pan. So this is not "weld spatter."
For the dent row to have been formed by a female die feature then the beading "valley" of the die would have to be filled by some material...and in a straight liine across several valleys. I cant see what that could have been caused through....unless there was an erroneous weld strike across peaks and valleys in the female, but the peaks were cleaned off, and the valley left. Thats just possible, I'll concede, but unlikely in my opinion)..
From Dave's picture it appears that the dent row feature is also visible as a sunken feature on the underside of the frame (maybe DM can confirm this when he fets the frame)...If this is correct, then it means that the weld strike theory on the female must be brought into question. How can the male and the female have exactly the same weld defect in the same place (but in negative).
We know that "draft angles" in a die (the angle of a sunken feature) are important ; if the angle is too severe then the forging will stick in the die....is it possible that this occured and the buckling is as a result of the release process ?.....OK.. maybe stretching a point, but not impossible, but unlikely I'll agree.
I'm sorry to keep thrashing this point, but if the male die was the "hub" and the hub was repressed into the die to reform the female during the repair process that produced the "B" type female, then features in the male will logically re-appear in the modified female. Any impact damage on the male would appear as indentations on the beading peaks, creating raised features in the valleys of the female, and therefore indentations on the beading peaks of the forged frame...as in the dent row.
(its hard to visualise this, I know...).
What does all this add up to in the context of this thread ?....quite honestly, I dont know. however the feature was caused, I expect that it would wear in the same way that the rest of the die would wear. It would also reflect the overall crispness of the cold forged frame. Where the dent row is poorly defined the overall frame crispness seems to also be less well defined....overall die wear, or merely less stamping pressure ?
But taking up Dietrich's point...who knows what the timeline is....Detlev clearly believes that 3R period 800/4's marked RK's of the "B" type exist. We have convincing evidence (for me and many others) of 935/4's being period...beyond that at the moment we dont know.
Yes...dies would have been polished and cleaned prior to each run....but then why would the frame that Dave posted show a well defined dent row, and lots of other problems (correct me if I'm wrong Dave/Dietrich) ?
Sorry...I've got no answers. But I wouldnt buy a "B" type except the 935/4. But if I already had one, I might just choose to hang on to it and await developments ! as Skip did with his flawed "A" type that many discounted as a post war copy....who knows the missing link just might appear !
But arent we getting rather off track here....Dave postulated that the ring on the frames were reworked to eliminate the dipping effect....what is the concensus on that theory ?
Comment