Hello everyone, first post. I have just taken over for my predecessor and am trying to help out for a situation that is currently word of mouth. I have not been present for a setup as of yet but anticipate one soon, so I am trying to gather as much info as possible to aid when the time comes. I have 4 Royal master 12*4 machines that are no longer able to hold a straight grind in thru feeding. We are seeing a -.0005 bowl taper in the middle of parts consistently (I.E. both ends are high, and the middle along the length is lower by about .0005). We have tried the adjustments to the regulating wheel dress path angles as described in the Royal Master manual, and in the previous history have had no issues with the straightness of pcs. This seems to be a new development over the past year that multiple different operators have experienced across all our machines. My operators have ensured that the guides were correctly set, as this was my first question. They also tried numerous different angles for helix and dress from close to 0 up to 5 degrees (matching them to each other as per royal master manual, nothing below the 0 line) of our machines have a belt drive system and 2 are motor driven for the regulating wheel. I wouldn’t expect the 2 to behave the same in regards to the taper if it was the drive system but both systems show the same taper. has anyone had this issue an could offer some insight on avenues that I can look for that may be the culprit of our bowl cut pcs?( I.E. both ends are high and the middle along the length is lower by about .0005). Thanks for your time, I look forward to reading the posts that come along.
There is a picture attachment from the manual to illustrate the taper but its hard to see it---->
There is a picture attachment from the manual to illustrate the taper but its hard to see it---->