wheel magnets for chuff sensor

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applor		#1 Posted : 23 April 2018 01:10:27(UTC) Retweet
Joined: 21/05/2004(UTC) Posts: 1,654 Location: Brisbane, Queensland		Hi gents, Just wondering if anyone has gone down the road of using a hall sensor with magnets on the wheel to synchronize the chuffs? The hall sensor is suggested and widely available (TLE4905L) however details on magnets are not provided by ESU and Google search hasn't yielded much.
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JohnjeanB		#2 Posted : 23 April 2018 13:15:03(UTC) Retweet
Joined: 04/02/2011(UTC) Posts: 3,115 Location: Paris, France		Hi Applor I have a "reverse experience": while upgrading my BR 45 (37 450) to install a MSD 3 decoder, I did not bother to connect the existing hall sensor and wheel magnet because I could adjust the "chuff" sound perfectly with wheel retation and the number of cylinders. Seems to me that installing the magnet on the axle is quite some work, it may require some milling of the chassis, etc.). On my decoders, using MSD and MSD 3 with a CS2 it was possible to have 2, 3 or 4 "Chuffs" per wheel turn. Cheers Jean
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DaleSchultz		#3 Posted : 23 April 2018 15:39:10(UTC) Retweet
Joined: 10/02/2006(UTC) Posts: 3,997		What Jean said. Simpler solution is to time the chuffs to wheel rotations. 1) no additional cost 2) it works 3) any non linear relationship between chuffs and wheel speed cannot be seen at higher speeds. 4) gluing magnets to axles does not sound like fun and no doubt will eventually be found lying trackside.
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applor		#4 Posted : 24 April 2018 01:13:04(UTC) Retweet
Joined: 21/05/2004(UTC) Posts: 1,654 Location: Brisbane, Queensland		Thanks for the replies gents. Note however that this thread is in relation to 1 gauge - I also do not and would not do this work for a H0 scale locomotive. Originally Posted by: DaleSchultz What Jean said. Simpler solution is to time the chuffs to wheel rotations. 1) no additional cost 2) it works 3) any non linear relationship between chuffs and wheel speed cannot be seen at higher speeds. 4) gluing magnets to axles does not sound like fun and no doubt will eventually be found lying trackside. I have found with some of my H0 models that it is very difficult to get an accurate sync with the chuffs at low speed compared to high speed. While it is true that its not noticeable at higher speeds, when you're talking 1 gauge in particular, I think that a definite sync would be easier and more beneficial.
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ShannonN		#5 Posted : 29 April 2018 06:12:16(UTC) Retweet
Joined: 14/08/2016(UTC) Posts: 492 Location: Maryborough, Qld		Originally Posted by: applor Hi gents, Just wondering if anyone has gone down the road of using a hall sensor with magnets on the wheel to synchronize the chuffs? The hall sensor is suggested and widely available (TLE4905L) however details on magnets are not provided by ESU and Google search hasn't yielded much. Small Neodymium Disc magnets are very strong and easy to get from ebay or Aliexpress or if in oz HERE I have about 100 I got for a project using hall sensors to trigger input for a Maglev train.

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