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Desertfox, tool was not in use for long, and the usage was a standard test that we run and which has never seen this failure before. As I'm not a mechanical engineer by training, I will try to get one of my colleague's to help me with the stress calcs. We have only gone as far as teh material...

OK, the shaft is made from C45 steel, the insulating tube is 11.91mm ID, 14.40mm OD, fibre reinforced Glass filled nylon. The assembly method is that we have the tube tapped with a plastic mallet in to one end spider, this sa then tapped, same hammer, in to the stack of laminations. At this...

Hello everyone, I'm not sure if this is the correct forum for this question or not, but, here goes. We had a failure recently where one of our armature shafts (small motor for hand held powertool) failed with rotational shear. In the area of the failure, we have a stress relieving undercut...

We pack various parts for our service dept by first wrapping them in VPI paper, then bubble wrap, then packing in a cardboard box. We have various sizes of parts, and hence various sizes of VPI paper to wrap them in. In our company it has always been the assumption that for the VPI paper to be...

And now the second post. Why do I want to go to a PV system. There is a lot of use of brown coal over here. In the autumn, winter and spring, as I drive up the valley, I can see the dirt and smog in the atmosphere. I am contributing to that, and it is something that I don't like. I also see...

Guys, thanks very much for the info so far, the homepower and otherpower websites have some useful info there. If anyone knows of a European site, that would be most welcome as well. I am going to make two posts now, this one, were I try to work through some of the technical aspects, and another...

Hi all. Happy new year! This is an initial post for a project that I am hoping to do this year. Background: I live in the Czech Republic, in a south facing house with two roofs of different pitch (I will measure the pitch (approx fifty something and forty something)and area later on when the...

A friend of mine was once asked, 'do you want to be an expert, or a leader'. As a young grad, he plumped for Expert. Now, he thinks he should have gone the other way. Thing is, he still can. My own experience is that as long as you can learn, and know the best way to learn for yourself, (be it...

Armature spins at 19,300 rpm, has a 6 tooth helical gear on the top, meshing with a 51 tooth gear. At the moment I am interested in the audible range, as I can easily corelate this with the EOL operators. The laser method would seem to suit best, of the non contact methods, as I think I could...

Hi, there's a lot of preamble to this post, but it will help to understand my problem, we make powertools, with the usual universal electric motor with a pinion gear driving up into a gearcase where the rotational force is converted to lower speed axial and rotational forces. We test the tools...

It's a dust extraction system for power tools. Basically a vacuum cleaner that you stick on your drill. In the tester, we connect the drill bit end of the unit, via some tubing, to the low side of the sensor. We then run the unit, this sucks air from the drill end, through a filter, then out...

I guess I could approximate the pump curve from the data I get from the test units I sent to the design centre (l/min) which I will test on our tester (mm H2O), and the upper and lower limits. Any thoughts on possible external influences on the pressure readings. The sensor assembly is an Omega...

What further information is required? Colin

We have a vacuum device that is specified in l/min from our design centre, but our line testing unit is measuring in mmH2O. Is there a conversion between these two units? We are seeing drift in the pressure measurements that give the impression that the units are out of spec on the low side...

case hardened to 50 HRC to a depth of 0.2. Application is a threaded bush holding a side handle to a power tool. The actual heat treatment is not specified on the drawing.

One of our suppliers is having trouble locating stock of a particular steel, 20CrMn, and they want to offer us 20CrMo as an alternative. Now, I am an electronic engineer by training, becoming more mechanical as my job progresses, but I have no idea where to look for the characteristics of these...

Dave, no, there is no groove. Sorry, I guess I didn't write the first post very well. I am not after a metal to metal seal, I want to combine the oring with the existing seal that is pressed into one of the housings, the seal that also seals the shaft. I would then send the new design seal...

I have 2 housings. One housing has a seal pressed into it, to seal a shaft that goes through both housings. Sealing between the housings is done by an o-ring, compressed between the two housings. This causes me problems in assembly, as this o-ring often gets cut or damaged when the two housings...