Author Topic: Chainsaw dyno  (Read 987 times)

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Offline man of stihl

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Re: inertial dyno
« Reply #10 on: March 26, 2015, 04:21:00 am »
Neat! Thanks for sharing.
Ron

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Re: inertial dyno
« Reply #11 on: April 06, 2015, 01:01:29 am »
Next step will be to mount a Kart hydraulic disc brake to slow the flywheel.   The rotating assembly will then be dynamically balanced. I spun the flywheel up to about 4000 rpm and it was relatively smooth in the vertical axis but when decelerating it would vibrate laterally a small amount then go away and re appear at a lower rpm. likely another issue stemming from welding two plates together.


Wow some nice work.  Some great fabrication work there.
I caught a glimpse of your Miller Tig, very nice.


I was wondering if the vibrations could be caused by harmonics since it only seems to happen at certain RPM's.
If so you might have to put a break on it to slow down faster and eliminating the problem.   
PP 505, 475, 445.

Offline aclarke

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Re: inertial dyno
« Reply #12 on: April 06, 2015, 09:53:16 am »
Thanks.  Really like the Miller Aerowave, kinda an oddball machine. Inverter/transformer machine.

I ordered the disc brake set, see how it spins with the brake disc installed and figure out if it needs further balance work.  Dynamic maybe?

Offline aclarke

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Re: inertial dyno
« Reply #13 on: April 06, 2015, 10:00:57 am »
Could be harmonics with the long shafts?  Need to cut em down to size

Offline aclarke

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Inertia dyno
« Reply #14 on: December 27, 2016, 09:57:11 pm »
Started a saw dyno project last year and have made some progress with it recently.  Hoping to be able to accurately monitor small changes such as carburetor venturi size, muffler outlet size etc. Will have intake air temp, exhaust gast temp and cylinder head temp to start with. Still need to make the final mount for the bar and also the brake lines etc.

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Offline aclarke

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Re: Inertia dyno
« Reply #15 on: December 27, 2016, 10:00:11 pm »





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Offline RoyM

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Re: Inertia dyno
« Reply #16 on: December 27, 2016, 10:10:37 pm »
It will be interesting to see how it works. Very nice fab work.
Old age and treachery always overcome youth and enthusiasm

Offline mdavlee .

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Re: Inertia dyno
« Reply #17 on: December 27, 2016, 10:10:44 pm »
Looking good Adam!

Offline adam32

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Re: Inertia dyno
« Reply #18 on: December 27, 2016, 10:17:24 pm »
Nice! Did you figure out the balance issue on wind down?

Offline aclarke

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Re: Inertia dyno
« Reply #19 on: December 27, 2016, 10:26:17 pm »
Had it Dynamically balanced at one of then local machine shops that does aircraft engine overhauls. (about $90)
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