Recent content by Tigerdawg

I have heard that, but do not know any details why it is not recommended. Projection welding was chosen because the process and the machine must be interchangeable with either steel or aluminum parts with minimal changeover. Plus, we aren't having any problems with the weld. The problem is in...

We have a application where we are resistance projection welding aluminum. We are having problems at the ground electrode with pitting. Our electrodes are RWMA class #3 copper. Is there a different material that is better suited for this type of welding? What other issues may be causing this?

Is the casting an odd shape with no opposite sides parallel (except for draft) even as cast? I would think you could make a jig where you could clamp the piece in your milling machine to mill your reference flats. You mentioned the parts are cast at the high end of the finished tolerence. It...

It is a resistance welding process with one or more projections on one of the parts to be welded.

I have a situation where I need to find a flexible electode for an automated welding process. The electrode must be flexible because the required contact area is not consistant. We are looking at possible making a mat out of braided copper. Does anyone know a source of braided copper...

I do not know about other 3D packages since it has been 5+ years since I've had any time on anything other than Solidworks, but it handles AutoCAD legacy data really well. You can even open and edit DWGs within Solidworks if you really want to. I think they have incorporated Intellicad into...

Can anyone recommend a testing method for nitrided parts? The tester our QC is using is a Hartip 3000, and we seem to always get lower values than expected. It is possible to 'break through' the case and read a lower value than actually present? The case depth is supposed to be >.015". Also...

What is the rule of thumb for the root diameter for metric helical gears? Isn't it (#teeth-2)*module for spur gears?

Any ideas where I can find a set of standards inexpensive enough for an account to approve?

Thanks C, now I just have to wait for the metallurgy report for the actual numbers.

That was what I was trying to get at. At .020, we are already near the core hardness of ~32. The drawing called out for .020 case depth, deep for a 3 module gear but not impossible. Also, the load is a shock load. To make matters worse, the machine is in a plant with a disgruntled union. We...

The teeth were ground. I do not have the documentation in front of me, but the surface finish visually compared with a 16 to 32 finish based on a sample I have handy. The fillets look typical to what I have normally seen. The motion is reciprocal, and the teeth did look like they broke at the...

We currently call out for a .020 nitrided case depth on a set of module 3 gears. We had a failure and have the set out for testing. Verbally, the metallurgist has said that our nitriding was no where near .020 deep. I'm preparing for the big fight between our purchasing agent, my boss, and...

I've done a bit more looking and nitriding is probably the way to go, but what about case depth?

On 4140 or 4340 metric gears, what is the most effective heat treat method? If nitriding, what is a reasonable case depth? I have seen .15 x module in a recent post for carburizing, but is that valid for nitriding?