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Thanks for your response, I appreciate your input. Here are some additional details that will clarify this specific process. In this application the individual products passing thru the nips are intermittent. As a result, the nips open and close once every cycle to "eject" each product. The...

I can't imagine that this isn't a common design problem. I am driving two rollers, one stationary and one that moves from a position of contact with the stationary roller to a position that creates some clearance between the rollers. The simplest way to move the second roller is to mount it on a...

We are looking at a reduced availability of MIC-6 Cast Aluminum Tool and Jig material which we have used for years for our heated seal dies. An alternative called CAST5000 has been suggested by our vendor. I need to confirm that it is acceptable and have tried to collect properties for both...

I thought I would add an image to provide a little more clarity to our application.https://files.engineering.com/getfile.aspx?folder=a484148d-964e-4f33-984f-1cbdc30788f3&file=Score_Cutter.jpg

I appreciate your response and I'm looking into the geometry of the blade we are using. I also took a look at a Gerber cutter you mentioned. Our application doesn't require anything that fancy. We are slitting a pair of straight lines about 30 inches long. Because the slit is not continuous it...

We slit plastic film with a round slitter blade. The film is stationary and resting on a ground hardened plate. The blades are pneumatically actuated forcing them down against the film and then advanced along the film for the length of the cut, after which the blade is retracted and returns to...

I appreciate all the helpful feedback. I think I now have multiple directions to pursue in reducing wear in my application. I'll try to reply back with any results that may be of interest.

Here is second image that did not upload with my previous post.https://files.engineering.com/getfile.aspx?folder=ba7d2b22-a6c0-486e-9c14-2c1a059321b4&file=folding_front.jpg

I have attached a couple of images for clarity. The polyethylene web is continuously pulled through this portion of the packaging line. As the web is pulled over the folding board, the web is folded in half and turned horizontal. The edges of the folding board wear from the continuous sliding...

The machine in question manufacturers flexible packaging using various films one example being polyethylene. Part of the process pulls the film over a triangular folding board whose edges can be made from various metals, such as stainless steel or aluminum. We have used various treatments and...

I am certainly open to training. As a first step I would like to read a comprehensive description and discussion of the methodology of Risk Assessment. The granular level I am looking for seems to be hard to come by. I have purchased ANSI B11.TR3 but it lacks the details I seek. Any resources...

I am doing a Risk Assessment on a production machine using ANSI B11. It is not clear to me exactly what is meant by Probability level and Exposure level. Probability is described as: "The likelihood that an individual, when exposed to the hazard, will suffer the consequence" and the levels vary...

sreid, Link appreciated. Thanks

Tmoose, Thats right but you need to allow for locational tolerances to ensure that there is room to install rings with bearing in place. I can calculate tolerances and come up with a theoretical distance but thought that there may exist a rule of thumb that consistantly works that's more direct.

Compositepro, The belt specs are 1% stretch at 22 lbs/linear inch. I don't believe I need that tension and in fact I believe it to be way over what is requied for this application As as a result the bearings, shafting, tensioners ect are not and can not be designed to operate under that level of...

Narrower machine had 2 bearings. For the wider machine with the longer drive shaft, I split the shaft and added a third bearing in the center but I don't like the arrangement I used. I used a roll pin to connect the left and right halves of the drivesahft and fear that the joint will fatigue if...

jlnsol, The Belt Manufacturer's specs call for pre-tension of 22 lbs per linear inch(width). There are 14 belts adding up to about 68 inches of total width resulting in 1500 lbs of pretension. I don't believe my 1.563 dia x 80" long drive shaft can sustain these loads. This leads me to believe...

I'm am designing a belt conveyor that transports thin polybags from where they are cut free from a roll to a packing table. I believe the transport of these practically weightless bags are not significant enough to include in any initial calculation. So the pretension and running tensions for...

I am wondering what the accepted method for detailing retaining ring grooves on a shaft or in a housing, with the purpose of locating a ball bearing axially. Are the inner faces of a pair of grooves, which are meant to retail a bearing between them, set at the nominal bearing width? Wider to...