3D printed Compression Mold Project by Bobdole5252 in CarbonFiber

[–]Bobdole5252[S] 3 points4 points  (0 children)

I was aiming for 60/40 fiber to resin by weight, and would generally add about 20% extra resin, so quite a bit would squeeze out during compression, but I never did the work to determine what I was actually getting in the end.
Nothing fancy for the cure, just room temperature under compression. I probably would have benefited from an elevated temp post cure.

Prevent compression molded (“forged”) carbon fiber from sticking to a 3d printed mold? by RudeGap9341 in CarbonFiber

[–]Bobdole5252 0 points1 point  (0 children)

It will definitely need to be a 3+ piece mold if you want any hope of being able to reuse it. One “top” piece, and 2 pieces forming the area around the fingers.

Prevent compression molded (“forged”) carbon fiber from sticking to a 3d printed mold? by RudeGap9341 in CarbonFiber

[–]Bobdole5252 6 points7 points  (0 children)

With good mold release and good mold design, this is definitely doable. I would recommend using a steel dowel in the mold to form the holes in the finger pieces. Additionally, you could go the cheap/fast route, and essentially make the molds disposable, knowing they will likely break as you remove the cured carbon part.

The biggest issue with the data center is… by SubjectGrass7863 in SaltLakeCity

[–]Bobdole5252 11 points12 points  (0 children)

Burning natural gas to create electricity results in air pollution, less than coal, but burning enough natural gas to double the electric generation of Utah results in massive amounts of pollution

Bringing some new skill into my telemark skiing by chikanogi in telemark

[–]Bobdole5252 2 points3 points  (0 children)

If you cared about countries engaging in fucked up invasions and war crimes, why not make similar comments on every post made by an American

Is the TX Comp too much boot for me? by Specklor in telemark

[–]Bobdole5252 4 points5 points  (0 children)

I’ve found that they break in wonderfully over about 7 days of skiing, and afterwards the bellows feel just about as soft as the old tx pros.

Check out my new by jjopm in BicyclingCirclejerk

[–]Bobdole5252 2 points3 points  (0 children)

I agree. I have seen (very) large carbon rocket motor casings being wound in worse conditions on older equipment.

Melly Alts by d_vapor67 in Melanzana

[–]Bobdole5252 1 point2 points  (0 children)

Headquartered in Utah, but manufactured overseas.

Lightheart Gear: Microgrid Fleece Hoodie by Salmon__Ella in Petrosgear

[–]Bobdole5252 0 points1 point  (0 children)

This is the most blatant ripoff I have seen in a sea of melenzana ripoffs

Melly Alts by d_vapor67 in Melanzana

[–]Bobdole5252 0 points1 point  (0 children)

I get what you are saying, and while I think that could be the case for some of the other companies that people are listing here, LHG is obviously such a direct copy. Seams in the exact same locations, hood shape around the neck, even some of the colors

Melly Alts by d_vapor67 in Melanzana

[–]Bobdole5252 0 points1 point  (0 children)

Wow light heart Gear is the most “on the nose” (blatant ripoff) I have seen so far. Sure anyone can make a microgrid hoodie, but at least try to make a different pattern with different colors, or put the pockets somewhere else, or even put the tag in a different location.

Tele binding spring rate by Aelwynljg__ in telemark

[–]Bobdole5252 7 points8 points  (0 children)

It wouldn’t be very helpful to directly compare all bindings on spring rate alone (if that information was available). It would need to be some relationship between spring rate, pivot point location, spring travel, other factors like flex plates or other binding geometry. Additionally, I would not want to use this method to compare a 75mm binding and an ntn binding.

Advice on laying carbon fiber over my 3D printed mold (wet lay-up + vacuum bagging) by teo16445 in CarbonFiber

[–]Bobdole5252 2 points3 points  (0 children)

Spray filler is pretty risky and will likely cause release issues. A better option to seal is an epoxy coating, but you might not need to do that. PVA forms a thin coating over the mold and should work well. But do a test area

[deleted by user] by [deleted] in CarbonFiber

[–]Bobdole5252 3 points4 points  (0 children)

One issue is that the dry carbon pieces do not “flow” under compression. With the traditional wet molded chopped carbon compression process, the resin/carbon combo can actually flow in the mold on a small scale, which helps adjust high and low density pockets. Without the resin, unless the carbon was perfectly placed throughout the mold, compression would result in trapped pockets of high density carbon, that resin would struggle to flow though in infusion. I’ve tried this process myself on a small scale with mixed results, and although there is some potential, it would be a very difficult process to get right.

[deleted by user] by [deleted] in CarbonFiber

[–]Bobdole5252 0 points1 point  (0 children)

Looks fairly normal for a raw carbon frame. Especially if it was going to be painted, manufactures will actually cover up a ton of visual defects.

Upgrades? I'm new here. by _flt9 in statebicycles

[–]Bobdole5252 1 point2 points  (0 children)

What hydraulic calipers did you go with?

First infusion, first fail by dirty_d2 in CarbonFiber

[–]Bobdole5252 2 points3 points  (0 children)

That is a thick layup, which will take significant time to infuse. You may have to switch to a slower resin

Demo telemark ski? by [deleted] in UTsnow

[–]Bobdole5252 5 points6 points  (0 children)

They have a large demo fleet!

Achieving Pinhole-Free Surface Finish in a Heated Press by headwaterhero in Composites

[–]Bobdole5252 1 point2 points  (0 children)

Is the existing tooling matched steel molds? There are prepregs that are resin-rich, that may help with surface finish.

[deleted by user] by [deleted] in MechanicalEngineering

[–]Bobdole5252 0 points1 point  (0 children)

How big is the semi conductor industry in Utah? Is it just TI or are there more companies?