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Dave · 03-22-2005, 05:54 AM

Good to hear about the DD tops.

First I was not trying to fault anyone’s product. I do not think the small cracks are an issue. I was just trying to explain these cracks are already there, and likely not an issue. I also do not believe they "grow" to the point they would leak on a straight O-ring type fitting, maybe an NPT fitting in very small amounts. It was an NPT type port I cut when Dan told me not too.

Now about the pumps, most of our 750 customers just purchase the center section of the pump (drive section) and cut or mold the pump housing into there product. In our industrial application, we do the same thing as well. We make a threaded round center section; you just screw the whole piece in like you would a sensor or valve.

For the OEM MAG's, there is a plastic case and a stamped rear section. The pump is very ugly and we at C-Systems believe looks are a big concern. All the insides of a retail MAG are plastic and I guess once reviewers get samples you will see what I mean.

There is also a huge difference in price between a simple two piece mold, and a mold for barb fittings. A retail version will require barb fittings as our early sample tests showed.

For example, at AVT we cut a mold yesterday for a new plastic mounting plate for an OEM MAG, costs to our customer was $850.

The costs of the MAG mold pump section for C-systems parent company product, which incorporates dual piece snap together fittings, for very fast assembly, was a little over $26,000! It was a big job which took several weeks to design, cut and test.

Why did we never cut the pump housing of the 750 out of solid Delrin?
Not sure, I'll ask, but I suspect Dan likely didn't see a reason for it, as we have never seen a pump fail because of pitting. Remember there is a big difference between galvanic corrosion and natural oxidation. I plan on making a Delrin MAG rear case later this week to see how it looks thanks to a suggestion on this board.

As engineers we are still learning what everyone wants. You should know by now engineers look at things differently then most people.

03-22-2005, 05:54 AM	#17
Dave Cooling Savant Join Date: Oct 2004 Location: Canada Posts: 260	Good to hear about the DD tops. First I was not trying to fault anyone’s product. I do not think the small cracks are an issue. I was just trying to explain these cracks are already there, and likely not an issue. I also do not believe they "grow" to the point they would leak on a straight O-ring type fitting, maybe an NPT fitting in very small amounts. It was an NPT type port I cut when Dan told me not too. Now about the pumps, most of our 750 customers just purchase the center section of the pump (drive section) and cut or mold the pump housing into there product. In our industrial application, we do the same thing as well. We make a threaded round center section; you just screw the whole piece in like you would a sensor or valve. For the OEM MAG's, there is a plastic case and a stamped rear section. The pump is very ugly and we at C-Systems believe looks are a big concern. All the insides of a retail MAG are plastic and I guess once reviewers get samples you will see what I mean. There is also a huge difference in price between a simple two piece mold, and a mold for barb fittings. A retail version will require barb fittings as our early sample tests showed. For example, at AVT we cut a mold yesterday for a new plastic mounting plate for an OEM MAG, costs to our customer was $850. The costs of the MAG mold pump section for C-systems parent company product, which incorporates dual piece snap together fittings, for very fast assembly, was a little over $26,000! It was a big job which took several weeks to design, cut and test. Why did we never cut the pump housing of the 750 out of solid Delrin? Not sure, I'll ask, but I suspect Dan likely didn't see a reason for it, as we have never seen a pump fail because of pitting. Remember there is a big difference between galvanic corrosion and natural oxidation. I plan on making a Delrin MAG rear case later this week to see how it looks thanks to a suggestion on this board. As engineers we are still learning what everyone wants. You should know by now engineers look at things differently then most people. Last edited by Dave; 03-22-2005 at 06:01 AM.