Author Topic: Chainsaw dyno  (Read 987 times)

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Offline aclarke

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Chainsaw dyno
« on: March 25, 2015, 11:29:23 pm »
Started building an inertial dyno to help determining changes on saw mods a couple months back in my free time,

basic frame:









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Offline aclarke

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Re: inertial dyno
« Reply #1 on: March 25, 2015, 11:33:04 pm »
flywheel was cut from two 1" x 16" steel plates and tig welded together.  in hindsight i should have gone with a single 2" piece of steel to make things easier.  Joe was a big help in helping calculate the needed mass.




Offline aclarke

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Re: inertial dyno
« Reply #2 on: March 25, 2015, 11:34:32 pm »
Blanchard ground flat...




Offline aclarke

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Re: inertial dyno
« Reply #3 on: March 25, 2015, 11:36:24 pm »
machine bore on Bridgeport for weld in Taperlock hubs



Offline aclarke

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Re: inertial dyno
« Reply #4 on: March 25, 2015, 11:44:15 pm »
lathe was too small to turn the 16" flywheel so I mickey moused a grinder set up.   Had to grind at a slight angle to preserve the weld integrity. this was the first issue with welding two plates. OD was less than .001 off when finished, was surprised.







Offline aclarke

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Re: inertial dyno
« Reply #5 on: March 25, 2015, 11:46:51 pm »
32 pin sprocket to keep flywheel speed safe



Offline aclarke

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Re: inertial dyno
« Reply #6 on: March 25, 2015, 11:48:24 pm »

Offline aclarke

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Re: inertial dyno
« Reply #7 on: March 25, 2015, 11:49:46 pm »

Offline aclarke

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Re: inertial dyno
« Reply #8 on: March 26, 2015, 12:03:46 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.


Offline mdavlee .

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Re: inertial dyno
« Reply #9 on: March 26, 2015, 03:18:21 am »
Cool stuff.

 

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