Author Topic: Chainsaw dyno  (Read 3051 times)

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Offline aclarke

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Re: Inertia dyno
« Reply #20 on: December 27, 2016, 10:31:45 pm »
Second pic on on far right shows a ratchet hub (sprag) so the flywheel disengaged from the saw as soon as power is removed. Was gonna use a Torque limiter from a tractor PTO but decided on this route.
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Offline adam32

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Re: Inertia dyno
« Reply #21 on: December 28, 2016, 10:10:44 am »
Sprag clutch...now your talking my lingo...the flywheel goes into autorotation ;)

Offline Cut4fun .

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Re: Inertia dyno
« Reply #22 on: December 28, 2016, 04:04:03 pm »
 :o Dang!  :o   8)


Offline Chris-PA

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Re: Inertia dyno
« Reply #23 on: December 28, 2016, 09:03:54 pm »
Very nice work!

Offline aclarke

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Re: Inertia dyno
« Reply #24 on: December 28, 2016, 11:42:07 pm »
Thks guys. I'll post some more pics thus weekend when I get the Sensors mounted.
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Offline 1manband

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Re: Inertia dyno
« Reply #25 on: January 04, 2017, 05:35:30 pm »
wish i could weld like that!!!  <<< 1972 cadillac

am doing some testing on a very low cost rpm sensor setup right now <$5 for DIY folks like me.  <<< 1972 volks bug
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Offline aclarke

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Re: Inertia dyno
« Reply #26 on: January 05, 2017, 11:54:01 am »
Joe, you get the noise issue resolved on your speed sensor test set up?

Adam

Offline 1manband

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Re: Inertia dyno
« Reply #27 on: January 05, 2017, 04:02:35 pm »
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
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Offline Nathaniel Vansickle

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Re: Inertia dyno
« Reply #28 on: January 06, 2017, 10:28:53 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
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Offline aclarke

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Re: Inertia dyno
« Reply #29 on: January 06, 2017, 08:25:38 pm »
Great idea Nate! Thank you.

 

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