Guide-magnets tweaks.

Tips and tricks about building a car. painting it a making it run smooth.
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Joined: Mon 9. Nov 2015 11:49
Location: Norway

Guide-magnets tweaks.

Post by kiklo » Thu 30. Jul 2020 09:09

Mag1 the orignal magnet is Diameter 4mm x height 3mm.

Mag2 has a 5x5mm.

In My proto I have tested both D4 and D5 mm. Thinking the slightly heavier car needs a stronger magnet.

I have run a 5x3.7mm most of the time - feeling the car was a bit nose heavy - sliding the guide on the track and slowing it down. Not quite able to adjust as i'd like.

Then I change to a 5x2.7mm magnet and things started to loosen up. I could lower the magnet to get good turns and straight speed was better.
But there was this strange loosing it on the straights I could not understand and this click, click sound.

Buy examining the guide I found the magnet was sliding up and down in the guide
- and the 2 small magnet I use to center the guide pulled the magnet up from the Magline at straights.

I think this can be used in future design to enhance driving. There is of course some considerations to be made - like wear in the guide - getting the balance between straight line and turn hold.

I'll fill you in when I have some more to tell (or even if I don't).
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Racing Regards

Kim K.

Posts: 345
Joined: Fri 21. Dec 2012 17:37

Re: Guide-magnets tweaks.

Post by WesR » Sat 1. Aug 2020 22:25

My move to 1/24 scale has also meant that the magnets need to be changed. As Kim knows, there are no rules for this.
As we are also using magnets between the servo and the track arm, this is also variable. A assumed that the guide arm would be 33% longer but the original 1/32 one works just as well! This does also bring the magnet back in line with the king pins which slightly reduces the car weight on the front wheels and increases it on the rear.
RE magnet sizes, I feel that a smallest possible diameter for the guide magnet should minimize the wander from side to side along the wire. So, on the 1/24 cars I am using D4 but increasing the depth to 4mm. Wander or 'fishtailing' down the straight is now a thing of the past.
My five cars are now just about perfect. The only small problem left is that, for consistent lane changing, the servo magnet movement needs to be less than maximum. Therefore, when driving 'off the wire', the steering lock is not as much as it could be. But not a major problem.

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