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Reference sensor sleeve dimensions

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Old 02-11-2018, 03:11 PM
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darek_u
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Default Reference sensor sleeve dimensions

I'm looking for possibility to modify my early style ref sensor bracket to accept the sleeve for reference mark sensor. It looks like my car has had the bracket replaced down the road with the old style one. Price for the new sleeve is a bit high, I'm working with highly skilled machinist who can make it for free... I will appreciate if someone who has it spare or just available/accessible give me the dimensions - OD, ID and total length. I presume it is made of aluminum? I would just measure the spare sensor to figure it out but I'm away from home so your help would be much appreciated. TIA!
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Old 02-12-2018, 12:36 PM
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Tom M'Guinn
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I'll see if I can dig one up for you...
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Old 02-12-2018, 03:34 PM
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I will really appreciate Tom...
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Old 02-12-2018, 04:27 PM
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Tom M'Guinn
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Hard to get a consistent reading, but I'd say 15mm even is probably most accurate for the I.D. for the bracket I have -- no taper that I can detect. The sensor itself has an outside diameter of about 14.9mm.


Here's the overall length of 54.8. Note that there is a little lip on the top side that is about 2.2mm tall and has an O.D. of 19.5mm. The O.D. of the body itself is about 18mm. The lip on top acts as a stop to seat it in the bracket. A magnet does not stick to the sleeve and it appears to be aluminum. Note also there is a bevel on the I.D. of the top lip, presumably to help center the sensor and guide it in place. There's also a bevel on the O.D. at the bottom.
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Old 02-12-2018, 05:09 PM
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951and944S
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Kinda cheesy quick emachine drawing, but, per Tom's measurements -



T
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Old 02-12-2018, 05:26 PM
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Perfect! Thank you so much Tom!
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Old 02-12-2018, 05:29 PM
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Just on a side note regarding the material it will be made of. If I cannot find suitable piece of aluminum - will stainless steel work? I'm not an expert when it comes to magnetic fields, interference etc. What do you think?
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Old 02-12-2018, 05:58 PM
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Around $0.50 an inch.

https://www.speedymetals.com/c-8371-...thickness=0.75

T

Originally Posted by darek_u View Post
Just on a side note regarding the material it will be made of. If I cannot find suitable piece of aluminum - will stainless steel work? I'm not an expert when it comes to magnetic fields, interference etc. What do you think?
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Old 02-12-2018, 06:10 PM
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Around $0.50 an inch.
Thanks for that but I'm in offshore location now... I have to use what is available, at least until I'm back home. That's why I'm asking for stainless steel, just in case.

BTW thank's for the drawing!
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Old 02-13-2018, 08:40 AM
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Jay Wellwood
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Stainless has ultra low magnetic properties due primarily to the Nickel and Chromium content - essentially none. Depending on clearances between the sensor and the sleeve - more of a potential of galling. Use a light coat of nickel based lubricant during assembly and you should be fine.
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Old 02-13-2018, 01:51 PM
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Tom M'Guinn
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I'm far from an expert (far), but I assume the factory used aluminum because it is highly conductive and therefore a good shield for electromagnetic noise. Aluminum is up there with silver, gold and copper in terms of conductivity, whereas most stainless is near the bottom of the list in terms of conductive metals. See chart linked below. That said, aluminum is all around us -- surely you can find an old bike handle or something that can be machined into a tube...

http://www.tibtech.com/conductivity.php
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Old 02-13-2018, 03:45 PM
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Thank you very much for your assistance here. All is clear - it has to be aluminum or copper. Unfortunately at the moment I have stainless steel and brass only available but I may be able to find a nice piece of copper.
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