The Ford Barn - View Single Post - Peter Tommasini metal shaping class with two Fordbarn members

RockHillWill · 11-08-2016, 08:49 AM

During the class, a discussion arose regarding a statement that I have made that mentioned the previous week, while at Jim's, I took a nice smooth panel made in Peters machine and when installed into another (fabricated) machine it put marks in the panel.

This test was done when I was at Jim Hery's measuring more on the Bugatti project. The test machine that we used was one that I fabricated using some leftover parts that Jim had in his shop. I have long been suspect of the segments made when making a fabricated wheeling machine, so I drew up a design in SolidWorks that I felt would eliminate the erratic loading of different segment lengths. I made several tests that made me feel good about vertical deflection, and went forward with the build, only to discover that I had underestimated the concern about left-to-right movement of the upper wheel in regards to the lower anvil.

It was my determination at that time that the issue with the fabricated wheel was that it moved side to side when the smooth panel made on Peters machine was inserted into my machine. The movement off-center of the wheels resulted in a lowering of the pressure, and when the panel was pushed or pulled back between the rollers the pressure was regained only to be lessened again. Erratic movement with this situation is what I believed to be the issue. This highlights one of the major advantages to Peter wheeling machine design. In my thinking, I was trying to eliminate the segmented loading of the frame by using a water jet contour to provide a linear response to a load at the wheels. I have included some pictures of my machine without the top and bottom plates and one with the plates in place. The difference that I am trying to highlight is the cross section at the lower back portion of the frame. My machine cross section left to right is constant, and I feel that it is suitable for the vertical loading, but grossly insufficient in the left-to-right 'twist' concern. A close look at Peters machine will see that he has addressed this issue by gradually changing the cross section from a vertical load concern to a horizontal load concern, resulting in a wider cross section at the base of the backbone.

BenchWheel.jpg

JIMS1 003b.jpg

Oblong 008.jpg

Oblong 040.jpg

Oblong 083.jpg

11-08-2016, 08:49 AM	#25
RockHillWill Senior Member Join Date: May 2010 Location: Rock Hill, S.C. Posts: 985	Re: Peter Tommasini metal shaping class with two Fordbarn members During the class, a discussion arose regarding a statement that I have made that mentioned the previous week, while at Jim's, I took a nice smooth panel made in Peters machine and when installed into another (fabricated) machine it put marks in the panel. This test was done when I was at Jim Hery's measuring more on the Bugatti project. The test machine that we used was one that I fabricated using some leftover parts that Jim had in his shop. I have long been suspect of the segments made when making a fabricated wheeling machine, so I drew up a design in SolidWorks that I felt would eliminate the erratic loading of different segment lengths. I made several tests that made me feel good about vertical deflection, and went forward with the build, only to discover that I had underestimated the concern about left-to-right movement of the upper wheel in regards to the lower anvil. It was my determination at that time that the issue with the fabricated wheel was that it moved side to side when the smooth panel made on Peters machine was inserted into my machine. The movement off-center of the wheels resulted in a lowering of the pressure, and when the panel was pushed or pulled back between the rollers the pressure was regained only to be lessened again. Erratic movement with this situation is what I believed to be the issue. This highlights one of the major advantages to Peter wheeling machine design. In my thinking, I was trying to eliminate the segmented loading of the frame by using a water jet contour to provide a linear response to a load at the wheels. I have included some pictures of my machine without the top and bottom plates and one with the plates in place. The difference that I am trying to highlight is the cross section at the lower back portion of the frame. My machine cross section left to right is constant, and I feel that it is suitable for the vertical loading, but grossly insufficient in the left-to-right 'twist' concern. A close look at Peters machine will see that he has addressed this issue by gradually changing the cross section from a vertical load concern to a horizontal load concern, resulting in a wider cross section at the base of the backbone. BenchWheel.jpg JIMS1 003b.jpg Oblong 008.jpg Oblong 040.jpg Oblong 083.jpg __________________ Uncle Bud says "too soon old, too late smart!"