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I am trying to compare different shapes of cylindrical objects in free flight for their stability. All the info I can find online talks about how to determine if a model rocket is stable. The most complex part of this approach is correctly taking into account the fin count and shape. All...

Photos don't wear out or get dusty and warped. Color calibration is a non issue at all. I am not having pantones cross referenced. I am simply showing what a part should or shouldn't look like. Like I said in my example before, if you were working at IKEA incomming inspection and had no...

Thanks for all the replies everyone. - After talking over with some other departments and getting other opinions here, someone suggested a photo of the part on the drawing so that QA knows what something looks like. An enginner that works with me brought up metal platting and how QA never...

Thats exactly what I thought of yesterday but after thinking about it more thought it would be way to over the top to check how clear something is. I have larger parts as well, around 1" x 3/4" that are also clear. Where do you point the laser? There I want the enire part to be clear, yeet due...

All the clear parts we use are for appearance. If there is a MIL spec, my vendors either won't be able to check it, or we won't be able to afford them. I can't stress that enough. This is simply an appearance thing. The small part I am talking about now, is what I DON'T want to be clear. I had a...

Ok let me touch on a few points here from different people. A lot of stuff is being said and it is a bit hard to sort out since in the end no one knows exaclty what I am talking about and I have not described it all perfectly. So let me start at the top and give a little more detail since...

Parts are machined, not molded. The internal structure is critical for the visual appearance of the part for customers and for ease of final assembly.

rb1957: Thank you for understanding where I am coming from. I have had vendors polish things that were not supposed to be polished too, simply because they, and I quote "polish and anneal all acrylic parts". Just strange. Of course we can stop using them someday, but that is not my question...

OK, a lot of questions here... I will try to answer you all in a nut shell so I do not drag on. My origional question was about how to spec out vapor polish and that the person inspecting parts is not an engineer. That question still stands. First are there people here that spec out polish of...

Thats what I wanted to do, but the engineer I work with brought up the point that the vendor already lied about polishing the part the first time, what makes us 100% sure they won't, or any other vendor won't in the future? I hate working with vendors that make me have to think like this, but...

I am a product engineer that makes drawings for parts that need to be vapor polished. In the past I have received parts that were spec’ed to be vapor polished, yet showed up not polished. The parts were buffed slightly so it was a bit hard to tell if they have been polished or not, this was the...

IRstuff: You hit the nail on the head in terms of understanding my question! Thanks you. You read me like a book, I did not bother reading the NASA spec. I figured it would be far to much for my needs, but I was wrong. Their VC spec is what I am shooting for. Just a clean part free of major...

I tried proposing that and my boss said no. He wants to be supplied with clean parts. With that being said, I don't need ultra clean parts and I certainly don't need "medical grade" clean parts. I have Googled that type of thing in the past and that is all overkill. My application is not...

Thanks for the replies. I guess I can state to what micron the filter needs to be. That’s fine, but that doesn't really address the issue. I can have the parts air dry, I don't mind. What I really want is parts that don't have finger prints on them, no oil from machining and don't look like...

I am product engineer working for a company that makes medical blood analysis equipment. We do not make anything that touches a patient; it is all just lab equipment. My company sells mainly to second and third world countries. The market we cater to is small labs that can't afford big name...

I am trying to identify a weld that goes all the way around a stainless steel rod/cylinder assembly. The weld is joining a tube, slipped over the outside of a rod, where the rod extends a bit further than the cylinder by about 0.5". It looks like a fillet weld, but one of the two legs is much...

I think there is no rule that ties so color darkness. I have some black parts that you can see the flow lines very well. While I have other parts that are white where you can't see them at all, and vice versa. I think it really ties into tool design, material selection and setting used during...

Right. I feel like all the golden rules need to be adhered to much more stringently when molding something that will not be painted.

Thats right, it all about reduction of mass with retention of strength.

Yes you can texture the mold. This is something I have done in the past. My molder(s) have no issue doing this once I tell them what texture specification I want. Only problem with texture is that it makes the part harder to release from the mold. One of the parts I want to do this to is already...