 | | Re: Melting Point of ABS (Re: Strengthening Gears)
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(...) I measured the temp in my attic last summer and it reached 115 F. Needless to say I don't keep much up there and definitely not my Lego collection! ROSCO had a bad "melting" experience: (URL) think this was caused by prolonged exposure to (...) (23 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Melting Point of ABS (Re: Strengthening Gears)
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(...) They're clearly not extruded... that's the kind Plastruct(R) uses. But if they're just plain molded and not impact grade I am hoping they are from the higher end of the range. The low end mold temp (and I agree with Thomas Avery's speculations (...) (23 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Melting Point of ABS (Re: Strengthening Gears)
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The first one you cite is probably the right one for LEGO(R) Bricks. They're molded, not extruded and I don't believe they are impact grade. Thomas Avery <thomas.avery@intec-hou.com> wrote in message news:GsI76v.GED@lugnet.com... (...) have (...) (...) (23 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Strengthening Gears
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(...) Yes, this is true. (...) Now that's quite a statement! I got an email yesterday from someone saying that the axles were the weak point too. I don't know how you're using your gears, but when something breaks in my models, it's the gears! (URL) (...) (23 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Strengthening Gears
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Plastic doesn't get stronger under heat-treatment. This type of heat treatment is used to control the crystallization of metals, and long-chain polymers like plastic just don't behave like that. If you need stronger gears, double them. It is the (...) (23 years ago, 5-Mar-02, to lugnet.technic)
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| | Melting Point of ABS (Re: Strengthening Gears)
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(...) There are different grades of ABS, each having different mechanical properties. I found an extensive resource on materials at: (URL) ABS property data can be found here: (URL) picked 3 grades of ABS that seemed likely to be the type(s) that (...) (23 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Strengthening Gears
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(...) Oh people people people!!! Stop what you're doing or thinking!!! (URL) a boo halfway down the page!!! I mean this was, to date, the most traumatic event of my life!!!! (well, not really but it makes a great story when I talk to my LEGO (...) (23 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Technic MOTM needs a new name.
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(...) All publicity is good publicity :) How about "t.c.f.k.a.m.o.t.m" (The competiton formerly known as Model of he month) or "I can't believe it's not Motm!" Steve (23 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Technic MOTM needs a new name.
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(...) *nods* When I wrote I had agreed and was looking for a new name, not a debate. I included the reasons, that's it. Something I kind of regret today since this whole matter is going out of hand... Mina två ören (Swedish: My two ören) /Tobbe (URL) (23 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Pneumatics: the old and the new
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(...) But, of course. As was carefully explained in my earlier post at (URL) is, you can store compressed air in a blue air tank (or as many of them as you have in your possession) and then release it for use later on. Then you charge it up again. (...) (23 years ago, 5-Mar-02, to lugnet.technic, lugnet.robotics)
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| | Re: Strengthening Gears
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(...) This sounds like the basic technique for "tempering". You've probably heard of tempered glass or tempered metal. From what I remember, this just changes the way the strength is handled in the material. A normal material bends more instead of (...) (23 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Pneumatics: the old and the new
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c s soh wrote: > (...) Umm... you still need the recharge the pressure in the tank once in a while, dont you? (23 years ago, 5-Mar-02, to lugnet.technic, lugnet.robotics)
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| | Re: Technic MOTM needs a new name.
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I'm going to throw in my "dos centavos". FOR LEGO SAKE! This "MODEL OF THE MONTH" feces (putting nicely) is getting to be about as bad as those dorkheads who couldn't agree wether the 21st century began in 2000 or 2001! This "whatever of the (...) (23 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Technic MOTM needs a new name.
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(...) Well Tobbe, When I started on rec.toys.lego (actually, it was alt.toys.lego) Joe Lauher had a Model of the Month segment where he'd pick a cool set and write about it: (URL) began in 1994 and ended in 1997. Obviously I'm not to judge what (...) (23 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Strengthening Gears
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(...) I tried cleaning Lego in boiling water once - it discolours and warps. (actually, it was Duplo - bought at a garage sale and being sterilized for the kids, but I have no reason to believe it's made from a different plastic) Matthias Jetleb (23 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Pneumatic Air Compressor not working. Suggestions needed.
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(...) I am guessing that your compressor is stalling out before you get enough pressure. The pressure in the compressor is high enough to react the torque of the motor. The fact that you have better results using one cylinder instead of two supports (...) (23 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Strengthening Gears
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(...) A quick search on Google shows that ABS (Acrylonitrile-butad...e-styrene) has a melting point of 103-128°C. Since water boils at 100°C, I don't have any doubt that you would see some deformation by that point. -- David Schilling (23 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Strengthening Gears
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In lugnet.technic, David Schilling writes: <snip> (...) single piece by itself will deform. If you handle it carefully (i.e. don't squeeze it hard by picking it out of the boiling water with tongs), it may not deform. But then I don't know at what (...) (23 years ago, 5-Mar-02, to lugnet.technic)
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| | Re: Strengthening Gears
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(...) I don't think I'd want to try this. There's a reason that LEGO recommends washing the parts only in *warm* water: if you used hot water, the plastic will start to deform. Some instructions specifically state this. For example: (URL) David (...) (23 years ago, 5-Mar-02, to lugnet.technic)
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| | Strengthening Gears
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I recently received an email from someone about strengthening gears. This person claims that by boiling the gears and then cooling them with cold water, their strength will increase. Has anyone tried this? What were your results? TJ (23 years ago, 5-Mar-02, to lugnet.technic, lugnet.robotics)
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