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MrFlippant last won the day on April 9

MrFlippant had the most liked content!

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About MrFlippant

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    Kart Driver
  • Birthday October 4

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    How could I not? :)

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    many and varied, but slots is a big one

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  1. You're Invited! Topic: World Wide Slot Car Chat - 127 Time: Oct 5, 2022 04:00 PM Pacific Time (US and Canada) Join Zoom Meeting https://us02web.zoom.us/j/88599165892?pwd=ZjR1MEczYzl3UFpmOWt2L0taTmczUT09 Meeting ID: 885 9916 5892 Passcode: 877968 Time Zone Calculator for 4pm Pacific: https://www.timeanddate.com/worldclock/converter.html?iso=20221005T230000&p1=234&p2=179&p3=136&p4=37&p5=240&p6=103 I hope you are able to join us!
  2. I updated my design to include a way to adjust the height of the rails in order to "calibrate" to another scale. The models provided are for Scalextric Sport track rails and a 30mm tall scale. If you have a scale of a different height and/or want to use different rails, you can edit the parameters in the included Fusion 360 file, or PM me to adjust the models for you. https://www.printables.com/model/286374-magnetic-downforce-scale-apparatus-adjustable
  3. Of course. That is physics. What you say applies to all such devices, whether expensive manufactured scales, or cheap DIY ones. All of those things will effect the reading the car gets on the scale (any scale) as well as on a track that has ferrous rails. Those things explain why two scales will have different readings of the same car, even scales that are manufactured in the exact same way (e.g. two Magnet Marshals). That's also why the Magnet Marshal 2 added the ability to easily tweak the position of the steel bar, so that it can be made to be closer (don't expect a perfect match) to another scale, so that both scales can be useful to club members, such as a "club" scale and someone's personal scale. And... why I'm going to be designing an adjustable version of the 3DP scale. If anyone has leads on steel bar of a suitable size to act as rail, with pre-tapped holes at each end, I'm all ears. Adjustable or not, the device is still useful as a tool of comparison, regardless of the actual number shown on the scale.
  4. yes, even with the much more precise Magnet Marshal 2 product, there's no guarantee that the numbers will match to the gram unless it can be adjusted and compared with the "official" scale to ensure parity. That's why one of the major improvements to it was the ability to adjust the bar in order to get two machines to be closer in their measurements. At this point, I think I'm going to go ahead and move forward with my idea for an adjustable one. The down side is that, unless I can find a piece of metal with threaded holes at each end, people will need to buy the appropriate tapping tool as well as the metal, a hacksaw, and other tools that they may not have on hand.
  5. well... do you have a set of taps to put your own thread in some steel bar? If so, or you want to buy taps, then I could do the version I thought of that uses a trapped bolt through threads in each end of the steel bar. The point is to allow you do raise/lower the steel bar to adjust how much pull it exerts. This might allow one to dial the 3d printed scale to be fairly close to the device being used elsewhere. You'd kind of need them side by side to test and tweak and test and tweak, though. Otherwise, there's no guarantee that your scale will be anywhere near their scale.
  6. I'd be interested to know more about the cars and device that was showing such wide ranging figures. That said, I've found the official Magnet Marshal to be quite accurate, even between units. I never did any tuning to my MM, but it reads the same amounts within a single gram as the one the club uses. The printed one, not so much. Too many variables for one scale to match the readings of another scale, not the least being the accuracy of the printer that the parts are printed on. To assist in consistency, it's probably a good idea to use some kind of tape or glue to mount the scale to the base, and then the plate to the scale. Blue/painter's tape on both surfaces to bind, and a few drops of CA to hold the tape together should do the trick nicely without permanency. Or those 3M "Command" strips that are easily removed. This way, the scale will remain centered on the base, the plate centered on the scale, and the plate not able to rock or tilt during the measuring process. Even then, though, the scale should not be expected to match other scales. This is for people who want to do some comparisons between their magnet cars without dropping $250 on a Magnet Marshal 2.
  7. Magnetic Downforce Scale Apparatus Inspired by several similar devices made by others using other materials (wood, metal, etc), and attempting to simplify and democratize the design and construction of a basic device to compare magnetic downforce between multiple cars, I've designed this model and provided the Fusion 360 file for quick and easy manipulation to accommodate different types of rails (from track as shown, or just bar steel if you want) as well as different scales. By just changing the parameters in the Fusion 360 file, this design can be easily adjusted for any combination of those things, and then printed out and put to use in a single day of printing. The files are free to download at the link below, which also includes additional detail on design and construction. If you already have a Magnet Marshal, then you certainly don't need this. But if you've wanted one without spending nearly so much, this might be for you. https://www.printables.com/model/280855-magnetic-downforce-scale-apparatus
  8. Next time you shod a car with fresh urethane tires, don't ever use your "cleaner" on them. Use only water. I expect you'll see the difference and realize that your "cleaner" is actually a "treatment." ;-)
  9. You're Invited! Topic: World Wide Slot Car Chat - 122 Time: Aug 31, 2022 11:00 AM Pacific Time (US and Canada) Join Zoom Meeting https://us02web.zoom.us/j/88933341228?pwd=bkNuMDhFbGVFakJJNEhTMzNRRmJwZz09 Meeting ID: 889 3334 1228 Passcode: 636817 Time Zone Calculator for 11am Pacific: https://www.timeanddate.com/worldclock/converter.html?iso=20220831T180000&p1=234&p2=179&p3=136&p4=37&p5=240&p6=103 I hope you are able to join us!
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