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Bosch Miter saw - Just cant get it square

by jonlan
posted 11-11-2016 02:59 AM


9 replies so far

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jonlan

57 posts in 969 days


#1 posted 11-11-2016 03:52 AM

Oh – and I forgot to add. It appears that the miter detents are not entirely accurate. When I get the square locked in perfectly at 90, then switch to 45 and make test cuts the miters are always slightly too steep to make a square mitered corner. A full set of test cuts on both ends of 4 pieces of woods (using the same locked in 45 degree setting on the saw) yield gapped miters. How can that be?

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DirtyMike

637 posts in 983 days


#2 posted 11-11-2016 04:12 AM

What exact blade do you have on the saw?

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jonlan

57 posts in 969 days


#3 posted 11-11-2016 04:17 AM

It’s a thin kerf blade. 100 count Freud. I’ve just realized that in some of my test cuts I was chopping rather than pushing so that accounted for some of the flexing I saw in the 45 degree cuts.

That however doesn’t account for the fact that when squared at 90, the 45 degree miters are significantly off. Is it possible that the detent block is just wrong? I can’t think of a way to adjust the detents for 45 without impacting 90 since they are all part of the same block. If you adjust anything the other detents move too.

Im wondering if Im just going to have to pick which detent I want to be right and then manually adjust the saw each time for other angles. That would be terribly frustrating though.

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DirtyMike

637 posts in 983 days


#4 posted 11-11-2016 04:37 AM

pushing huh? I have never tried that method with my sliding miter saw. I would contact Bosch about the correct alignment and tuning procedure before devoting anymore time. I have made things worse when trying to tune tools before and it is very frustrating.

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jonlan

57 posts in 969 days


#5 posted 11-11-2016 04:50 AM

When I push rather than chop I get a much straighter cut. When I was chopping I noticed that the cuts were coming out bowed in the middle.

Here’s a thought – is it maybe common not to use the miter detents for precise cuts? That is, Im wondering if it’s more common to manually set the angle with the detent override and just lock it in. If so, maybe that’s just how it is and I’ll need to find an accurate way to set the miter angle each time.

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Aj2

1582 posts in 1879 days


#6 posted 11-11-2016 05:10 AM

Well Jonian I have a Bosch glide saw.Ive had mine for least 5years.When I first got I did adjust the table to cut square. The blade your technique the material can affect accurate repeatable cuts.
And your square needs to be accurate to measure the saw and the cut.
I have a Forrest chop master full kerf when I want the best cut possible.
I’m sure you will figure it out but if your nearby maybe we can speed up the process.
I’m in So California

Aj

-- Aj

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jonlan

57 posts in 969 days


#7 posted 11-11-2016 05:44 AM

@Aj2 – Thanks, but unfortunately Im in MN :) Maybe you can hep me out because there’s a good chance that Im missing something. Here’s what I’ve done…

-I’ve checked the fences and found that they are inline with each other.
-I then loosened the 4 screws holding the detent plate in place, locked the saw in the 90 degree detent, and started making my test cuts and getting the saw closer and closer to perfect. During these cuts I use the screw in lock handle to lock the saw in position while making the cuts. Then I unscrew it to move it closer and repeat.
-Once I get the cut dead on at 90 I tighten up the 4 screws for the detent plate again.

At this point, my assumption is that the blade is 90 degrees to the fence. My thinking here is that if I have 90 degrees set correctly, and if the detent plate is accurate, then this is the only adjustment I should need to make in order for the other detents (45 for instance) to be accurate.

This is where things fall apart for me. 45 is slightly off despite 90 being dead on.

Is there something Im maybe missing here? I cant find a reason to adjust the fence at this point but is there a reason that I’d need to? I just can’t sort out how 90 can be dead on but 45 isnt.

Thanks

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JakeK

48 posts in 762 days


#8 posted 05-02-2017 03:50 PM

jonlan, i know this is a slightly old thread, but i’m wondering if you came up with any solutions. I am going through the exact same thing except i also noticed that my 2 fences arent perfectly coplanar. If you slide a workpiece along the left fence to the right, it will slightly bump into the right fence. I dont see any way you can adjust it. I did the same thing – squared it at 90 and then moved to the right 45. It was way off. I found that if you push it and hold it to the left side of the 45 detent and then lock it in, it is very close to 45 degrees, but that just sucks. BTW, when i did my 90 and 45 tests, i did it just using the left fence so it was consistent. Overall i’m pretty disappointed with this saw.

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jonlan

57 posts in 969 days


#9 posted 05-02-2017 06:19 PM

@jakek I ended up giving up on using the detents. My fences seem to be inline so Im not sure if we have the same issue but I finally just gave up on the detents for locking in angles. If I need perfect miter joints I do that on the table saw with a jig I built. The Miter saw is still handy for cuts that I cant do on the table saw and for quick work but its not a precision tool IMO. I too am disappointed with this but I just couldnt justify wasting any more time on it. If I need to do a precision angle on it I end up putting it in detent override and manually squaring it. A pain but it works.

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