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No, I am using the 1994 version, but like I said..I am just getting my feet wet with this. My dilemma was with undercut features when part is clamped on a CMM table for inspection. The way I understand it noe is that datum planes should be identified such that CMM operator can have access to...

Thanks both of you! Here comes the dumb question, what happens if I specify datums A, B and C such that the rectangular cut-out becomes not accessible when the part is clamped on a CMM table, is it OK? When we define datum planes, do we think of the CMM process or is it mostly related to...

Please take a look at the attached image and let me know if I can define the flat portion of the semi-sphere as my datum -A- and still measure the position of rectangular cut-out. Thank you, Adrian

Hi, I am new to CFDesign and was running some trial analyses on my computer the other day. Basically I was trying to compare two different valve geometries and measure the cfm. However, my results never converged. Called tech support and was told that results do not need to converge unless I am...

Thanks for the quick reply Pad, Sounds like you agree that post paint is the most cost effective way for metallic finish. We are based in tha USA and were always told that it was really hard to mold with aluminum flakes due to cosmetic issues, just like you mentioned. On the other hand, I look...

What is the most cost effective way you use to give a metallic-finish look to your plastic part? Post-paint or, molding with a metallic color? Thank,

Where I work at, us engineers do all the modeling, drafting, stress/thermal analysis, etc. We don't have anybody with a drafter/designer title too. I should also mention that we are extremely efficient, I remember three of us getting done ~120 dwgs in a week. The company is not small, (~2000...

How come I am not getting a better performance from my evaporator that has rougher surface then?

Yorkman and all others, thanks a bunch for all the comments. I was busy with something else and finally was able to find some time to get back to this post. In the mean time, I've conducted an EDS analysis on both tubes and fins. Here's what I found;Tubing material for both evaps are identical...

I found out that the fins and the tubing has different surface roughness. The one that performs better has a better surface finish hence the water can hold on to surface easily. (ice build up clogging the air flow?) What do you guys think about the significance of surface finish on evaps?

One more thing, tubing and fins are made out of Al. But not quite sure if they are both the same Al alloys. Would this has something to do with the performance. (I mean the source of my 25%)

Basicallay what I do is, I take a freezer, and test it with one of the evaporators, and take that one out and install the second one in. test conditions are the same for both. I do the same thing for 5 pairs. Didn't test just one unit. Visually the only difference is that one looks more shiny...

Yes the variance is outside of the norm. I would say numbers vary by 25%. They are both tested under the same conditions though. Basically, it is a unique design manufactured by two different companies. when you look at them you won't be able to distinguis one from the other. Material that they...

I have two freezer evaporators (134a) which are identical by design (geometry). However, when I test these for energy, one of them always consumes more kWh. I am pretty sure that I am doing the test right, but I just can't tell why do I get different results? Any ideas? Thanks,

Hello all, I am having some issues with my project engineer lately. I graduated recently, and am working as an engineer in a company for about two months. I was assigned a project a month ago and I was able to submit it succesfully. However, my boss never really showed any close attention or...

I just took apart my old hp printer and found really interesting parts, thanks for the input everyone...

Hello all, I recently graduated from college and landed on a job where I do design with CATIA v5. As far as the Catia part goes, I am very confident at working with, but I don't have much experience with designing plastic and sheet metal parts. I often times ask for help and advice from other...

Hello everyone, I was wondering if anyone can help me out or lead me to a starting point of modeling a freezer. What I want to do is that model a "chest freezer" where I can analyse the heat flow from inside of the freezer to outside world. My main goal is to analyse the heat flow with several...

Hi ccw, thanks for the reply. Actually I want to design a small device which I will draw playdough through horizontal roller couples to get a perfect cylindrical shape. it's obvious that I can do it in one shot by using only a roller couple but instead of using only one couple I want to use...

hi everyone, Let say, I have a 75mm diameter clay cylinder and I want to reduce its diameter to 50mm by using bunch of rollers. I know that I can reduce its diameter by using only one roller couple but I just want to know what kind of calculations I have to go through in order to decide the...