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Shop Built Raker Depth Gauge

Listing #48   Listed on: 08/20/2011

Part of my operation involves milling trees that are too large for my Woodmizer LT40 and I have a fair demand for large flitches so chainsaw milling is in order. When milling wide logs with big chainsaws, you want your chains to be perfectly tuned. If you have ever sharpened your chain several times and noticed that they cut less well each time-it may be because your rakers are too high. In front of each tooth is a protrusion called a raker which regulates how much of a cut each tooth can take. They are suppose to be below the top of the teeth by 10% of the gullet width. If they are too high the tooth cannot get enough of a "bite", too low and the bite is so much the tooth digs in and stalls the chain. There are a number of devices out there to file the rakers down but I have settled on using my chain grinder and for years have used feeler gauges to measure the raker depth below the tops of the nearest two teeth. A couple of weeks ago I made this Shop Built tool to do this job for me fast and accurately. I am a pack rat for keeping junk that is "too good to throw away". A friend had given me a very expensive looking digital micrometer but with no way to use it without making a jig of some sort to hold it--so it sat in my junk drawer for a couple of years. The same guy (a bigger junk collector than me but with less space) also had given me some sort of small aluminum press. I took it apart, modified it, re-drilled and tapped a hole for the the threads in the bottom of the micrometer, made a plate to straddle two saw teeth and presto I had a raker depth measuring micrometer. Notice that the gullet is .280 and the raker depth is 0.0270 on the micrometer. Very close enough to the 10% ideal.



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View Larger, Higher Quality Image

More pictures of construction--- Just about any micrometer will do--digital or dial--that has a way of attaching it to the saddle and the saddle could be made of wood. The point at the bottom must also be flat. This micrometer had a rounded one so I searched my can of bolts and found a small, large headed one that would thread into the micrometer base and sanded the slot out of the head to make it flat.


 
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View Larger, Higher Quality Image

 
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Shop Built Raker Depth Gauge

 

Viewer Comments:


Posted By: The Staff at WOODWEB     [10/27/2011]

WOODWEB would like to mention that a Little Wizard II hand held metal detector was sent to Bill Stuewe for taking the time to post his Shop Built Equipment Forum entry "V-Drum Sander". Thanks again for sharing Bill.



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