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will get it under a microscope this morning and post it.

Have a part I am trying to identify, SOT23-5, labelled QWA6. Assuming it is a transistor, could be a diode in this circuit. Cant find it.

We have a couple of product problems that may be solved with a laser. First problem is to seal a glass lens into a delrin lens base: we can make a small bezel which overhangs the lens and laser or hot-stamp it to act as (hopefully) a seal or at minimum a means of clamping the lens in place...

Thanks, they have a lot of materials. DO NOT go through the front door at Huntsman, otherwise you get to know what chemical to treat your soy beans with, our how to invest in the company. Found better luck to Google Huntsman and epoxy molds, and received a waterfall of info. Thanks again.

Well it sounds like the best thing to do is forget it. The original idea was sound, but the power issues are not simple, and yes, by the time one is finished with all of the converters you are into thousands just for the power. Thanks for the input, better to stop this train before it goes...

Thanks. Thats good news, and 100 shots is fantastic. Well as it comes out, polycarbonate would have been a good candidate for some of our optical parts, and we use a lot of Delrin as well, which is a higher temp. But, considering the basis of this - protos - I should try to stick to my own rules...

That requires me to dig in a separate lines, I suppose I can do that, sounds cumbersome. The VFD wont do the whole deal?

We have purchased an Arburg ALlrounder 35 ton injection machine, old but in beautiful shape. It has a MUD set (modular tool setup) so quick change with smaller subtools make this ideal for us. What I want to do is make a unit tool (basically a bath-tub for the epoxy) for epoxy molds. We do a lot...

I am considering purchase of an evironmental chamber that is 400 VAC 50 hz. I have 208 and 480 VAC in the shop. The chamber basically is an oven and a refrigerator, so lots of stuff including control electronics. If it was a simple device the 400/50 matches up with 480/60hz, but it is not so...

More: Tests show the Lexan is in good shape and has not been disadvantage by excess humidity nor by release agents. The breass insert used was a straight cylinder with barbs, probably unheated and of unknown level of cleanliness. Thermal stresses are the probable culprit, aided by the additional...

Update: Strong focus on the wrong insert for the application. High level of stress concentration at insert interface due to wrong insert surface (barbed) and thermal differential. Possible use by molder of mold-release compound. May very well go to post-mold ultrasonic welding. One more try then...

Yes, a long way from home. I dont think there will be a problem bringing in the tooling if we bring it here. Our operation is rather old fashioned in that we are vertically integrated, except for the plastic injection. We invent, design and build it all. I am doing my best to resist doing the...

Thanks, thats a good summary. Parts have worked extremely well in the past. We supply the resin (GE Lexan, now Sabic)and that end of it I feel is controlled. Three months - one month to get the Lexan here (special colorant) plus two months turn including shipping. But if we can resolve the issue...

Thanks. The circle is getting smaller. The lead time will be a killer now. Thanks to all.

Pushed one inseret through, cleaned with toluene (its what I had) then re-inserted. Ok, not good experimentally on at leaset three points, I know. I then heated the insert with a soldering iron as before. I believe I had more resistance than before - but it still went at 8-10 inch pounds. In an...

Something smells in Denmark. Its just that its not from Denmark. Both comments ring true. It is very easy to think they simply opened a box of inserts and started throwing them into the mold without any cleaning. Perhaps inserts come pristine andthat is not necessary to do. But it is looking...

Just ran over and tried heat staking, in the sense of a small soldering iron heating up the insert. I kept it there until I saw an ever-so slight liquid ring around it. Let it cool. No dice, it held a little bit longer then gave way and slid out. Tried it a couple of times, willing to try more.

We have an ultrasonic welder in house and ready to go, as well as a CO2 laser that I am considering aiming in the direction of the vendor. Actually we have a couple of heat stakers as well somewhere. Would you think zapping the insert with the Ultrasonic welder would do? I am thinking of a small...

Recieved a large delivery of Lexan parts that fail in torque test. There is a small threaded brass insert molded into the housing. The insert acts as a captive nut in the housing, and the housing is clamped onto a mounting bar. This normally takes foot pounds, this shipment didnt even take 10...

Thanks Mike - you are right. Our lens holder is a precision affair and we center to the ID then manipulate to final position. You have described what we use to do - still do on some units. The next step was to keep that and then add a retention ring with an ultrasonic welder to hold the lens on...