Chainsaw Repair

Quote from: 1manband on January 05, 2017, 04:02:35 pm

Quote from: aclarke on January 05, 2017, 11:54:01 am

Joe, you get the noise issue resolved on your speed sensor test set up?

Adam

not as of yet.  getting closer to a clearer signal, literally by moving the sensor closer to the spinning magnet.  hahaha. 

along with noise was also getting harmonics?  maybe that is not what they are called.  multiples of the actual rpm.  if it read 150 rpm, would then get 300, 600 then some wacky 300000 stuff.

for non-electrical minded folks just like me, i am trying my stab at making an rpm sensor.  the rpm sensor is the thing you need to get a homebrew inertial dyno going.  the next step is software that i am using, tweaking the output raw data into a spreadsheet to work out hp and tq.  the software is very basic... and can be used as is........but it is lacking some things i hope to bring to the table.  software as is runs on any laptop.  older ones are better to use with it, imo.  my laptop is 2 (?) years old, and am trying to get the older software to recognize my sensor.

hope to make this all clearer as i go along.

later

take a look at the universal cruise control kits if they are still available. Thats how they worked....magnet hose clamped to the driveshaft with a sensor mounted close by. installed allot of those systems back in the mid 90's.

if you can make your setup convert multiple pulses into a single revolution you could also use a tone ring off an axle and the ABS sensor....ford escapes have replaceable tone rings that are relatively cheap. i may even be able to come up with one of those to send you

cool idea.  appreciate the offer.  i do not know if the laptop would recognize the abs sensor signal?  the way this software works, it senses the rpm signal through the mic input. it could sense up to 2 different rpm signals, if i understand it correctly.  the rest of the sensors, up to 4 if used, run digitally somehow.  i do not have a handle on exactly how that works right now.

think the abs sensor reads the cogs off the wheel?  don't believe they are magnetic, but not sure.  something that reads magnets, like a crank wheel triggered ignition may work as well?

using a gutted out mic right now for a sensor.  the sensor test setup is attached to my lathe chuck.

the newer laptops use a 3 stripe input plug.  the software is set up for a 2 stripe plug.  going to order a splitter and a couple of spare input plugs to try to figure the pins out for wiring on the connector.  will be a week or so before they come in the mail.