Comments by "mpetersen6" (@mpetersen6) on "STEEL vs ALUMINUM vs TITANIUM Connecting Rods" video.

The shear strength sucks too. In terms of machining a lot depends on the tooling. The worst stuff I've worked with is nearly pure copper. In fact most metal in a nearly pure state machine like horse dung. Soft and gummy.
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I share your pain. I used to work as a Tool Marker and later i worked for a company that builds centrifuges for waste treatment plants. The number of times i heard people expouse that stainless steel is some kind of wonder material. They think if they use stainless screws they are much stronger.
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@Dave5843-d9m Possibly, but I question the cost effectiveness. In a production vehicle the currently used scintered and forged rods are perfectly serviceable for threat use. The rod is actually larger when it comes out of the sintering process and when forged ir reduces the volume and increases the density. Another option might be 3D printing using laser sintering of metal powders. This would actually allow the use of two different alloys. Hard and tough on the outside while softer on the inside. People are already doing 3D printer non load bearing components such as intake manifolds. Just how long before we see aftermarket aluminum 3D printed heads and blocks. These would still require a certain amount of machining but IMO would be cost effective in comparision to billet. I suspect that the engine manufacturers are already doing this. Originally 3D printing allowed for rapid production of patterns for casting prototype parts*. *One of the early 3D printing or stereo lithography techniques used paper rolled out on a platen with a laser cutting out the cross section. Glue on the next layer and tra e the cross section. Rinse and repeat until done. This technique is still around to some degree. There is a company in Ireland that was showing a desktop 3D printer that was combined with an inkjet. The idea is to produce fully colored and finished items https://newatlas.com/mcor-iris-paper-3d-printer/32903/
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@soundautomatic1 We didnt see any of those. AMPCO-14 & 21, D-2 and S-7 are bad enough. Later we switched AMPCO-18 and that's actually not bad. Copper Nickel alloys can really suck
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@ObservationofLimits Nodular cast iron cranks and rods were and are more than strong enough for most factory applications in reality. Scintered con rods are more than adequate for most applications as well. The higher output factory motors (Hellcats etc) are probably still using forged rods. Forged and billet rods in a high volume production run involve extra machining steps versus scintered rods (I used to work in an automotive engine facility). Cast iron rods require the same steps. The production process runs 1) Rough grind both faces 2) Rough and possibly semi finish the pin bore 3) Run the rod through a slitting operation to seperate the cap end. This may include roughing the bearing diameter depending on the operation used. 4) Perform all of the drilling and tapping operations along with cutting the bearing lock notch. 5) Finish grind or machine the mating faces 6) Assemble the rod and cap. At this point who knows were the original halves are. 7) Finish grind to width grinding both faces. 8) Semi Finish and finish the pin and bearing bore 9) Press in the pin bearing if a floating rod. 10) Bore and or hone pin bearing 11) Machine rod ends to match weight specs A scintered rod for a production engine has several production advantages 1) The rod and cap are never separated in that from the time the come out of the sintering process they are always a set. 2) A cracked scintered rod after cracking only requires a wire brushing of the mating faces and the rod can be re-assembled without any machining processes to the mating faces. The micro fractures of the surfaces provide a much better register surface. The facility I worked at over the years produced cast, forged and scintered rods. The cast and forged rods were labor intensive to produce. The scintered rods required maybe 10% or less man hours per part with less scrap. The reason the man hours were less was that the scintered rod once it entered the machining process never had to be handled until it was used on the engine assembly line. The cast or forged rods required handling for multiple operations. 3) The uniformity of the rods from one to another is such that the balance operation can pretty much be eliminated. Rods are checked for weight tolerance. Out of tolerance rods are scrapped. Eliminating operations reduces cost by eliminating handling, initial production machine tools cost and lower cutting tool costs
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@martinfidel7086 I spent 40 plus years rebuilding industrial machinery, machining and doing Tool work. We had a guy who wanted to make his own trailer hitch balls in order to learn programming CNC lathes. The boss told him he could do it on one condition. That he throw the finished part in the scrap precisely because of liability issues.
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@martinfidel7086 One of the early 3D print technologies was layers of paper where the layer would be profile cut and the waste cross cut. Then the next layer would be glued on and cut. The finished pieces were tough enough to be drill and tapped. I know the manufacturers were using them for prototype castings as it speeded up the prototyping a lot. You skip the pattern making process. Now flip this around. Design your finished part with shrinkage allowance. Now take your finished part and determine where your parting line is. Now do a slicing operation to mach your paper and glue layers. Cut out the layers with one of those crafting cutting machines like a Cricut. Now laminate the layers. Paint the finished lamination. Congratulations. Now you have your finished master casting for making your own Copes, Drags and Cores. I think that is just about the cheapest way one could do custom castings. There's actually a company (or was) that offers a 3D printer that uses regular paper where it produces the finished part in color. https://www.google.com/search?q=3d+paper+printer&oq=3d+paper+printer&aqs=chrome..69i57j0j0i22i30l3.13251j0j4&client=tablet-android-samsung&sourceid=chrome-mobile&ie=UTF-8#
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@embalmed Toxic too as I recall
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@michaelweston4738 I used to rebuild seam welding heads. High copper content spindle. The bearing mou ring diameters and the area where the conta t shoes ran all had to be ground. Copper grinds like poop.
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@BarryAllen-no9nj I know. The recommended torque ratings for A4-70 and A4-80 are around 50 to 55% of a grade 12.8. Plus over tighten SS in a SS tapped hole you've got a significant change of gauling and sizing the screw. In the industry I was working in normal procedure called for chucking the screws if they were used more than 3 times
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@BarryAllen-no9nj Fortunately the major components for the centrifuges we built (bowls, headwalls and scrolls) are all a magnetic stainless alloy that are cast centrifugally. https://www.centrisys-cnp.com/ https://www.bing.com/videos/search?q=centrisys&&view=detail&mid=B57FF007809EE2311266B57FF007809EE2311266&&FORM=VRDGAR
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@martinfidel7086 that's an option too. No matter what you do there's going to be significant machining involved. Plus there's always the option of a two piece layered cylinder head machined from solid.
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What about scintered and forged OEM rods?
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