Makita 1806B blade adjustment - Woodworking Talk - Woodworkers Forum
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post #1 of 4 Old 08-20-2016, 01:28 PM Thread Starter
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Makita 1806B blade adjustment

Anyone out there have experience setting the blades on this 6 1/4" Makita block planer? i've had it about 6 months, and this is my first blade change. I cannot get the blades to stay set to the same height. The manual says simply:

loosen the holding screws
adjust the set screws to the desired protrusion
use the triangular ruler to insure each blade is parallel across the length
repeat for second blade

that sounds simple enough, but i've tried it several times, and after setting i had noticeable vibration and rippled cuts. when i'd re-check, the blades seemed to have moved. So i'd reset them, and same thing.

Next i tried to be quantitative with the protrusion setting, so i got a 6" x 8" piece of polycarbonate and can now verify the protrusion on each side using a feeler gage (see picture below). I've set this to 0.003" several times on both blades, used the planar and then rechecked and the protrusion has opened up to as much as 0.020", and not evenly across one blade, nor between the two blades.

this certainly seems like i'm not tightening enough on the 5 holding screws, but Makita specifically says to only use the tool they provide (a hex key with about 3" of handle) to avoid overtightening.

anyone with experience with tool i'd appreciate your insight. you can respond to the forum or contact me directly at [email protected].
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post #2 of 4 Old 08-20-2016, 02:20 PM
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If they are moving they obviously aren't tight enough.

Is everything clean?

Sounds scary dangerous to me...

OH, wait a minute ............Yep!.............That's what he said!

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post #3 of 4 Old 08-20-2016, 02:24 PM Thread Starter
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thanks for the reply. everything as tight as i can get it with the tool supplied. clean too. mysterious, all i can think is i've built up some strain in the adjusting screws and during operation the blade position "relaxes" to remove that strain; shouldn't happen if the hold screws are tight enough. i'm going out now to try adjusting and then backing off all the adjusting screws to remove tension and see what happens. i've not heard of this problem, but this is a fairly rare tool in the US, so maybe no one on the forum has used it.
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post #4 of 4 Old 08-20-2016, 03:16 PM Thread Starter
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after several more iterative attempts, i've got the blades set equally and the planer is running well again. I backed the adjusting screws back out to midsetting so there was no strain, then checked again after putting a first torque on the set screws. In some cases, just tightening the set screws seemed to change the protrusion. I iterated like this until the protrusion stayed the same, and then bench ran the tool; again, some minor changes to the protrusion which i went back and reset. Then REALLY tightened the set screws using the tool supplied with as much torque as i could apply. going back and forth up and down the line of screws you will notice that until they are all set, you can continue to snug up small amounts with each pass.

hope this helps someone else.
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