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Any know of a test lab that can cycle springs? I would like to know the life of a spring at X amount of cycles. USA only please. The spring load is around 500 lbf

They are saying it is happening in the heat treat process.

There will be no secondary machining on this part. I am not sure if the secondary process to straighten will be done cold or hot. I am not sure what the best method is.

It is a part, looks like a cam. We are trying to hold some overall dimensions.

Will straightening cast steel cause internal stress? Our supplier is proposing the following process. Cast steel part, heat treat to hardness spec, and then straighten the part in a form. Is this going to introduce internal stress that will relax over time? Is this a standard process for cast...

I am trying to define torque and preload requirements for threaded tubing. I am using standard fastener equations to determine pre-load at a particular torque value. I used standard fastener equations to determine the tensile stress area. I then subtracted the area that is considered hollow...

Just wondering if anyone knew why ANSI specs now are designated as ANSI/ASME B18.2.1 or just plain ASME B18.2.1 Was there a transistion somewhere. I am looking for the ANSI spec, but it is actually located on ASME website. Just wondered.... I know they are the same specs.

I am trying to see if this is an acceptable combination? Class 3A has a tighter tolerance then a class 2A. But is the 3A tolerance always within a 2B? Is this acceptable attachment? Or should I force my customers to use a 2A bolt with a 2B nut.

WOW!! so many replies to this thread. I have not personally seen the failures, and they are not very common. This is an existing product, but I am working on a new product and do not want to carry over any problems. I agree about the weld size. We call out 1/4" weld, but actual weld size is...

Assuming my part does not see any loading (just vibration) I can probably actualy undersize the welds..

Thanks... these are prototypes for testing, so we will give it a go.

I have some 1/2" plates there were welded together with 1/4 fillet welds. I probably should have welded them with 3/8" or 1/2" fillet welds. Can I put another bead ontop of the initial? Or is this just not possible. The material is ASTM A572 Grade 50

I guess going back to my original question. The 1/4" plate is being welded on both sides with welds that are oversized. We call out 1/4" but I measured some and they are as large as 3/8" Since the welds are oversize, won't this always cause an undercut condition?

And if they are not using low hydrogen electrodes, could I have hydrogen embrittlement. They are not using any pre or post heating on the parts.

I have not seen the failures, as the 1/4" plate is completly lost in the failure. Is it normal to have an undercut with this type of weld? Or is it being overheated?

I have a 1/4" plate that is welded to a 1/2" plate. The 1/4" plate is subjected to a vibration type fatigue load. The current weld is 1/4" fillet all around the 1/4" plate. Our supplier is actually oversizing the weld and is looks to be about 5/16" Both plates are ASTM A572 Grade 50 Looking...

I am trying to calculate the deflections when a 4140 bar is loaded. Do the properties change when it is heat treated to around 35 Rc? I am guessing I would adjust the Youngs Modulus. any suggestions?

Anyone have the new release of mechanica? There is a "new" fastener feature. I have not been able to get it to work without an error message. "The inner contaction surfaces of the fastener are too far apart. You will probably need to create free connections between the fastened parts." I...

The bolted connections on PTC's website are not easy to follow. It seams they were made in the Stand alone version. I have tried to follow them in the Integrated mode, they always fail. Any other suggestions?

I am looking at some data for an existing gear we are using. It is defined as a standard Stub Tooth gear. (it currently mates with another stub tooth gear) Is "stub tooth" considered a standard gear type? Is the 'stub tooth" utilized to reduce wear on high loads? Reduce wear due to gear...