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?
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...
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...
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?
I am trying to figure out how to adjust the sheet metal settings so the flat pattern dimensions agree with the dimensions I would use when laying out the part by hand. For example, a 2 x 2 (inside lengths) angle would be bent out of 4" wide sheetmetal for thicknesses 11 ga. or thinner. This is...
I am working on a quote for a customer. They are specifying a "Burkett" valve actuator for a subsystem. I've never heard of it. Can anyone point me to some technical info?
I am testing an index table with a servomotor driven gearbox drive. I am seeing a spike in the accel. and decel. portions of the index. The system starts fine, then drifts away from its goal value (not accelerating fast enough) and spikes to compensate. In decel. mode, the table starts fine...
We wish to supply a compressed air accumulator to ensure that we have sufficient volume of air during times of peak usage without oversizing the compressor for this peak. How would I size this tank?
I am working on a retrofit for machinery in the Far East. Some of the drawings refer to 'Konan' pneumatic cylinders. Where can I get information on these cylinders?
I am trying to find an oil cooler for a gearbox. I am looking at 150 degF oil and 95 degF water. The ambient air of the area for the cooler is 95 degF in summer. A quick estimate of the cooling capacity is 10hp.
Does anyone know some good vendors who have a cooler for the above conditions?
It's been years since I've done any fluid analysis in depth. Is there a quick and dirty method to estimating SCFM when you have the SP and the duct size? I'm dealing with SP's in the range of 15-50 inches of water and duct sizes from 4-18 inches round.
Barring a quick estimate, about how...
I have a press rated at up to 20000 lbf. A customer wishes to monitor the pressing force during their process. I have not been able to find a sensor that can take the impact forces involved.
At initial impact, we have an ~800 lb crosshead moving at up to 20 in/s. Does anyone know of a sensor...
I am using a ballscrew with nylon wipers on the nut and am having problems with lubrication. The nut is rotating, and the process this machine is used in does not like daily shutdowns to grease the nut.
Can you apply grease directly to the shaft and get adequate lubrication? Would I have to...
How do you calculate the reflected inertia for a slide table driven by a rack and pinion? Is it similar to a ball screw drive, replacing the lead of the ball screw with the pitch circumference of the pinion?
Can anyone give the pros and cons of using a rack and pinion versus a ball screw drive for a slide table? The table may weigh as much as 1700lb fully loaded. The design goal is a ~15 inch index in ~0.4 seconds.
With the rack and pinion I am primarily concerned with the backlash. I do not...
Does anyone know a good source for examining the failure mode of a bolt head or nut being pulled through a steel plate?
I'm working on a project where A36 plate was substituted for A572 plate. A basic analysis shows this should be no problem. (The original design was done in Germany where St60...
I have a system that is using multiple servomotors to drive a single gearbox. We are doing this for the smaller motor inertias, better positional accuracies, and backlash control. What additional drops in efficiency do I need to be aware of beyond the efficiencies of each drive...
