I switched to a mandrel saver after bending a couple, now I can't over tighten...
#2MT Pen Mandrel Saver at Penn State Industries
Tom
You found your problem, but I did one recently that looked similar... a quick inspection showed it was the hole through the bushing that was cut off-center. I should probably throw that away before I accidentally use it again.Just went down and looked the mandrel is bent. Thanks
Oh yes you can! Too much pressure on the bushing, whether with the brass nut or the mandrel saver can cause the tubes to bow. Too much pressure onto the end of the mandrel will cause the mandrel to bow. Too much pressure with both and the problems are compounded.
Do a good turn daily!
Don
I switched to a mandrel saver after bending a couple, now I can't over tighten...
#2MT Pen Mandrel Saver at Penn State Industries
Tom
Definitely not saying this is wrong, but I'm having a hard time visualizing how the tubes would bow if you overtighten with the mandrel saver. I use it as well and have not experienced this. I have, like Dan indicated, seen the bushings with the hole not centered. I have a set of Majestic bushings that are like that and you can get it all set up to turn and see one bearing has a slight wobble look to it while running. Once my center comes in I'm planning to give it a go between centers as well.:wink:
Edit: Thinking about it a little more, It is pretty easy to overtighten if using the brass nut and are a beginning turner. The mandrel saver could probably be overtightened as well, but it seems you'd really have to be hacked off at your mandrel, and tighten the snot out of it to get any bowing.
What is the difference between tightening the brass nut against the right bushing and squeezing the bushings toward each other possibly causing the tube to bow, buldge or distort and tightening the mandrel saver against the right hand bushing and squeezing the bushings toward each other possibly causing the tube to bow, buldge or distort?? Distortion may not take place until most of the wood is removed...or it may not happen at all. But, it can happen. And yes, it will take a lot of cranking. The mandrel saver does eliminate the mandrel bowing problems associated with cranking the live center against the mandrel's end.