# Semi auto chunker
**URL:** http://forum.driveonwood.com/t/semi-auto-chunker/3768
**Category:** Wood Chunkers
**Created:** [February 20, 2018, 3:14am UTC](http://forum.driveonwood.com/t/semi-auto-chunker/3768 "2018-02-20T03:14:00Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@WyattBarnes](http://forum.driveonwood.com/u/WyattBarnes)
#### Post date: [February 20, 2018, 3:14am UTC](http://forum.driveonwood.com/t/semi-auto-chunker/3768/1 "2018-02-20T03:14:00Z")
[ ](https://www.youtube.com/watch?v=J1dWzp94uK4)
Not many new things under the sun. I envisioned combining parts of two machines that I had seen to achieve semi auto chunking. A pair of spring loaded gripping rollers, similar to ones on an antique corn chopper I own, timed to feed a workpiece a settable amount into a Keith style chunker. Then i found a video on the web of my idea. Logical really, a tried and tested feed method. Not as fast as a rebak but more versatile.
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### Author:  [@Handy\_Andy](http://forum.driveonwood.com/u/Handy_Andy)
#### Post date: [February 20, 2018, 8:27am UTC](http://forum.driveonwood.com/t/semi-auto-chunker/3768/2 "2018-02-20T08:27:23Z")
Nice! I had kinda been thinking along those lines too. Perhaps a geneva mechanism to turn the rollers intermittently. Chain driven from the chunking wheel so it would be timed right.
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### Author:  [@WyattBarnes](http://forum.driveonwood.com/u/WyattBarnes)
#### Post date: [February 20, 2018, 1:18pm UTC](http://forum.driveonwood.com/t/semi-auto-chunker/3768/3 "2018-02-20T13:18:28Z")
Finally found a better video that shows internals.
[ ](https://www.youtube.com/watch?v=QSX9S2ktlFQ)
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### Author:  [@Til](http://forum.driveonwood.com/u/Til)
#### Post date: [February 20, 2018, 2:42pm UTC](http://forum.driveonwood.com/t/semi-auto-chunker/3768/4 "2018-02-20T14:42:35Z")
Hi,
the first video shows the wood-chunk machine modified by Vesa Mikkonen. It is originally made for processing firewood, but he changed it to produce chnuks for his gasifier.
The changes are not permanent, so it can be used for both purposes. Here is an english version of the vid:
[ ](https://www.youtube.com/watch?v=yZcfVFbuPzY)
And here Vesa is explaining different types of fuel for the gasifier.
[ ](https://www.youtube.com/watch?v=4opSvorXofE)
Hope you find it useful.
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### Author:  [@WyattBarnes](http://forum.driveonwood.com/u/WyattBarnes)
#### Post date: [February 20, 2018, 3:16pm UTC](http://forum.driveonwood.com/t/semi-auto-chunker/3768/5 "2018-02-20T15:16:31Z")
Second video was quite interesting, he stated something that my father had read many years ago that the heat energy of all species of wood was the same…based on dry weight. I would like to know if what he did to the machine was a modification or an adjustment. My instinct thinks it is a modification to allow for a radical adjustment.
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### Author:  [@Til](http://forum.driveonwood.com/u/Til)
#### Post date: [February 20, 2018, 3:48pm UTC](http://forum.driveonwood.com/t/semi-auto-chunker/3768/6 "2018-02-20T15:48:50Z")
Hi Wyatt,
as far is I know he modified the crank mechanism in this chunker. This mechanism drives the gripper drum that pull the wood in the chunker.
So less stroke on the crank means shorter chunks.
The crank can be seen around minute 2 in the second video you posted (post #3 superpilke firewood processor)
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### Author:  [@WyattBarnes](http://forum.driveonwood.com/u/WyattBarnes)
#### Post date: [February 21, 2018, 1:21am UTC](http://forum.driveonwood.com/t/semi-auto-chunker/3768/7 "2018-02-21T01:21:46Z")
I just replaced the second video with an even better one showing the internals of this type of machine.