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Topics - Callistemon

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General Knex Discussion / K’nex Motor Quality
« on: June 30, 2020, 03:47:08 am »
I asked K’nex many months ago if their motors are brushed or brushless, and if they have a sleeve or ball bearing. They said the information was unavailable. More recently, K’nex User Group said they did not know either. Brushless motors with ball bearings are superior, being quieter, more efficient, and longer-lasting.

DC brushless motors with ball bearings usually last about 70,000 hours before reaching 10% chance of failure. That’s 8 years of continuous operation.

For my motorized fan I want the silver or red 190 RPM motor, but I don’t know if the torque will be sufficient as the line if battery motors is just different ratios at the same power. There is also the stronger 2-speed motor. The batteries will need to be recharged (alkaline batteries are horribly wasteful), but the worm gear motor is so slow and overly forceful.

General Knex Discussion / K’nex Ordering Options
« on: June 27, 2020, 07:41:59 am »
I don’t know where to order K’nex parts (in the USA). I never purchase anything from big box stores or unregulated marketplaces like Amazon, Walmart, Target, or Ebay. Anything purchased through K’nex User Group is shipped across the Atlantic Ocean and back in an unnecessary 8,000 mile round-trip. In addition, they said that only airplane shipping was an option on the way back, which has an extremely high carbon footprint. They also said that it would be better if K’nex could directly supply the parts.

K’nex User Group also said that Drop Shipping was not an option, as in that they could not intercept the order before it left the United States. They said their USA market share is too small to establish a smaller USA office next year (of course not this year).

This is why K’nex Replacement Parts was started, but their Terms page says anyone under the age of 18 is strictly prohibited from using their site, because they must have figured it was rated R. I contacted them, and they responded in under two weeks saying that they will consider changing their terms. But they don’t have the red 190 RPM motor or some other parts I need.

I don’t want to wait too long for K’nex Replacement Parts to change their policy, because if they don’t, then I am just wasting the opportunity at K’nex User Group, which recently lowered the purchase limit on angled orange clips from 64 to 4-8.

Update: I will be recycling broken parts not given away soon. See comment below.

I have a K’nex hand crank fan that uses a modified version of the model drill attached to a propeller with four yellow curved panels. Every 8 to 11 days, the yellow axle (before axis conversion) spontaneously falls apart and the area crumbles up. The yellow rod always breaks as it passes through the hole in the yellow connector. There was also a time where the red rod (after axis conversion, yellow in the original model drill) suddenly broke right where it passes through another connector, allowing the propeller to fall off.

Failure Dates
April 25 - Yellow
June 2 - Red
June 3 - Yellow (8 days)
June 12 - Yellow (9 days)
June 23 - Yellow (11 days)

Part suggestions: An extra-rigid yellow rod would help. Carbon fiber may also be a good resource for strengthening the rods, although it is currently not used.

A few of the curved panels have deformed tips and the connection is so floppy that they easily fall off. At the time of the most recent axle failure, there were only two blades on the fan since the other two were previously ejected and were not reinstalled. In addition, during the time of having two blades, there were two incidents where one blade fell off while spinning, which instantly made the propeller so imbalanced with just one blade that the entire red axle and the blue gear exploded off at 43 MPH.

I have an entire cup full of more than 60 broken parts, weighing more than 6.5 ounces according to quantity and K’nex User Group’s weight for each part. These parts are 2 to 8 years old. I need to know how to recycle these parts, unless someone wants some of the broken connectors. I don’t know what to do with the curved panels, as it seems wasteful to have the entire panel recycled just because of the tips, especially since they are discontinued.

K’nex responded after 13 days and said that the plastic is recyclable but they do not offer recycling services. All recycling centers near me are closed until further notice. Even when they were open, they were remarkably shoddy, lousy, and incompetent. The local recycling centers didn’t accept most things. One in particular charged fees for scrap metal, and there are rumors that even some of the well marked plastics were being sent to the landfill. They probably burned their e-waste.

If K’nex can’t even recycle their own plastic, they must not be using any recycled material. And they don’t accept broken parts for recycling. It’s not landfill-free to not use recycled material or accept broken pieces for recycling. I don’t know what to do. If anyone is interested in broken connectors, I will post an incomplete (as more are always being found) inventory of the quantity and weight of each type of part.

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