LumberJocks

Having a little Trouble with my R4512 -Can't align the knife with the Blade

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by fstellab posted 02-08-2013 03:51 AM 1091 views 0 times favorited 14 replies Add to Favorites Watch
View fstellab's profile

fstellab

86 posts in 838 days


02-08-2013 03:51 AM

Topic tags/keywords: table saw alignment blade question tablesaw

Hi Folks,

Trouble with the R4512, I purchased some Bosch blade stiffener. Part of the install calls for re-alignment of the the knife. Seemed like a easy process, and it worked fine for a few days.

The, I noticed that that the stock kept hitting the knife, so I repeated the process. Now I can’t get it aligned.

Any help would be greatly appreciated.

Cheers

-Fred

-- Fred Stellabotte (kamado@comcast.net)


14 replies so far

View nwbusa's profile

nwbusa

1017 posts in 1039 days


#1 posted 02-08-2013 04:44 AM

There are two 4mm hex bolts right next to the riving knife, on the left as you face the saw. Loosen them, adjust the riving knife as desired, then tighten the bolts.

I’m not familiar with the Bosch blade stiffener. Does it install on the left or right side of the blade?

-- John, BC, Canada

View fstellab's profile

fstellab

86 posts in 838 days


#2 posted 02-08-2013 05:00 AM

Both Sides of the blade .. very hard disk that is supposed to help very thin kerf blades, and it helps with noise.
So I had losen all 4 bolts .. ok I was only loosening the two larger ones.
Thanks

-- Fred Stellabotte (kamado@comcast.net)

View RussellAP's profile

RussellAP

2966 posts in 1039 days


#3 posted 02-08-2013 05:09 AM

You can’t use blade stabilizers on both sides of the blade on a 4512, not enough bolt left for safety.
If you don’t mind my asking, why do you need a blade stabilizer. I use a freud thin kerf without one and it cuts like Michael Angelo.

-- A positive attitude will take you much further than positive thinking ever will.

View Matt Przybylski's profile

Matt Przybylski

468 posts in 1131 days


#4 posted 02-08-2013 06:00 AM

Depends on how thin the kerf of the blade is but if its anything below .09 then you can’t use the knife with it as that’s the width of the knife. If the blade is in between two stiffeners it would not be safe to use them with the knife.

-- Matt, Illinois, http://www.reintroducing.com

View fstellab's profile

fstellab

86 posts in 838 days


#5 posted 02-08-2013 04:36 PM

Ok folks,

I will remove the stiffeners, It did work, there was plenty of room left on the bolt ..
but I was right edge of the alignment travel.

Is there a better knife available ?

Thanks ..
-Fred

-- Fred Stellabotte (kamado@comcast.net)

View RetiredCoastie's profile

RetiredCoastie

999 posts in 1936 days


#6 posted 02-08-2013 04:44 PM

I used to use stabilizers on my old saw but once I started buying quality blades I found I didn’t need them. I also only have 1 thin kerf blade but regular kerf blades work just fine and I find that thin kerf blades don’t realy give me any benefit. I suppose for low HP saws they would be an advantage.

-- www.thepatriotwoodworker.com Proud Supporter of Homes For Our Troops

View knotscott's profile

knotscott

5608 posts in 2128 days


#7 posted 02-08-2013 04:58 PM

I would not recommend blade stiffeners for the sake of just having them….they can be an effective band-aid for other problems, but they’re not a cure, and really aren’t necessary on a saw that’s spinning true using good quality blades. What prompted you to buy them?

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

View fstellab's profile

fstellab

86 posts in 838 days


#8 posted 02-08-2013 10:28 PM

Hi Folks,

yes .. Knotscott I did buy blade stiffeners for the sake of just having them .. I will not do that again.

I am a new wood worker, and I guess I wanted every advantage to take on a project with thin rips of expensive wood, and I will using this blade:

MODEL # DIA. TEETH ARBOR GRIND KERF RAKE APPLICATION
RS-25524-U 10” 24 5/8” ATB .079” 20 ULTRA-THIN 10” rip blade. Only .079” kerf. Fast and clean, even without stabilizer plates.

I hard time getting the plate on the motor side off, it was really stuck.

I aligned it again, much better, but it still needs some tweaking.

Am I going to have to buy a thin knife when I but the thin kerf blade on ?

-- Fred Stellabotte (kamado@comcast.net)

View kdc68's profile

kdc68

2080 posts in 1029 days


#9 posted 02-08-2013 10:55 PM

fstellab – If thin kerf is your preference then keep in mind the thickness of your riving knife. The thickness should either be in your manual or the knife itself (or both). As long as the width of the kerf on your blade is wider than the riving knive, I think you will be fine

-- Measure "at least" twice and cut once

View aaroncgi's profile

aaroncgi

33 posts in 729 days


#10 posted 02-08-2013 11:34 PM

Here are the riving knife and resulting required blade specifications for the riving knife on my R4512. I’m not sure if all R4512 are the same, or how close the RK actually is to what’s printed on it, so check the one on your saw. However, I think it’s safe to say that 0.079” kerf will be way too thin for the stock RK. I had a couple times when it felt like my rip was hanging up on the RK, and the blade at the time was 0.094” kerf (the minimum allowable). Fortunately that’s my combination blade. My ripping blade is 0.098”.

Anyhow, here’s what’s on the riving knifefe:

RK Thickness .090” (2.3mm)

and on the other side:

Blade Body .060” – .086” (1.5mm – 2.2mm)
Blade Kerf .094” – .126” (2.4mm – 3.2mm)

-- Aaron

View knotscott's profile

knotscott

5608 posts in 2128 days


#11 posted 02-08-2013 11:41 PM

The RS-25524-U would be from Tenryu’s Rapid Cut series. Not quite at the level of their Japanese made Gold Medal series, but is a good rip blade. However it’s pretty thin relative to the riving knife.

KDC68’s point about riving knife thickness is valid…the blade’s width (0.079”), plus whatever runout it may have needs to be a tad wider than the riving knife, which I believe is in the 0.09” range. A regular 3/32” thin kerf blade would work fine. The ultra TK will spin a lot easier, but you’ll need a different riving knife that’s less than 0.08”.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

View fstellab's profile

fstellab

86 posts in 838 days


#12 posted 02-09-2013 12:29 AM

Folks,

I have really messed up things, I can’t align the knife and blade. I wanted to go back to a known working configuration, so a put a standard kerf combo blade, with no stiffeners. I can’t get to align. As you all probably know there are 4 screws, two large, two small when I think the blade in inthe right place I start tighening the screws. I troied srating with the small ones, as soon as I tighte, the balde move .. same thing staring with the large screws.

I tried clamping 2 triangles to hlds the blade in place, then tighten the screws, as soon as I took the clamp off, the blades came out of alignment.

Well, I will leave it tonight .. and go watch TV (the wood working shows on u-tube)

Thanks folks

-- Fred Stellabotte (kamado@comcast.net)

View kdc68's profile

kdc68

2080 posts in 1029 days


#13 posted 02-09-2013 12:58 AM

fstellab -Yikes… take a break and come back refreshed…good luck with it

-- Measure "at least" twice and cut once

View fstellab's profile

fstellab

86 posts in 838 days


#14 posted 02-10-2013 01:55 PM

Hi Folks,

I was able to finally get it aligned.

The issue was the 2 big screws, when you tighten them (especially) the front screw, the knife moves.
I could hold the knife in place with my hand.

To fix, I cut a 2×4 and put it between the knife and the fence.

I used for several hours on Saturday, and the R4512 was back to cutting boards like they were butter. Then
I started some taper cuts, a board bound between my taper jig and the blade, which kicked the knife out of alignment.

I need to do some reading about taper cuts.

Cheers,

-Fred

-- Fred Stellabotte (kamado@comcast.net)

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com

Latest Projects | Latest Blog Entries | Latest Forum Topics

GardenTenders.com :: gardening showcase