LumberJocks

7 deg + Hook Angle on SCMS ok?

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by delfonik posted 02-13-2015 05:05 PM 1048 views 0 times favorited 14 replies Add to Favorites Watch
View delfonik's profile

delfonik

6 posts in 660 days


02-13-2015 05:05 PM

Topic tags/keywords: question

Hello, first post, but I’ve been a lurker for awhile.

I just picked up a DWS782 12” SCMS. I’ve read a bunch of threads/reviews/blogs about blades, and I feel like I’m now getting to the point of overthinking, and just need to order a new blade.

I’m not a contractor so I won’t be using the saw daily. Have some projects coming up which include building a bed for my son and eventually doing crown molding in our master bedroom.

I think I’ve settled on a CMT 72T blade.
http://www.amazon.com/CMT-253-072-12-Industrial-Sliding-Compound/dp/B000P4O79Q

What I really like about it is the price ($70 shipped from Acme), the .087 plate thickness (vs. .071 on Freud LU91 TK) , and tooth count. I’ve read a lot about deflection from TK blades, and one thing I’ve wondered is if the deflection is from the thinner kerf itself or the thickness of the plate, or maybe both? But that’s a whole other subject.

My only concern was the positive hook angle on the CMT blade. I’m guessing it shouldn’t be an issue for thinner stock that I can just chop straight down, but possibly an issue for the wider pieces?

Thanks for reading!


14 replies so far

View cabmaker's profile

cabmaker

1506 posts in 2270 days


#1 posted 02-13-2015 06:49 PM

Too many variables to give you a accurate answer,.........personal experiance, your dexdarity, species and size your cutting, (smaller will be more problematic) . I would not recomend any degree of positive hook on a slider reguardless of the blade price !

View delfonik's profile

delfonik

6 posts in 660 days


#2 posted 02-13-2015 07:06 PM


Too many variables to give you a accurate answer,.........personal experiance, your dexdarity, species and size your cutting, (smaller will be more problematic) . I would not recomend any degree of positive hook on a slider reguardless of the blade price !

- cabmaker

Thanks for the reply. This is my first slider, and the times I’ve used them in the past, I never checked what the hook of the blade was. I’ve seen recommendations for negative to slightly positive hook for a slider, so that’s why I wanted to ask.

I’ll only be using the saw for home projects. Will be building a twin farmhouse style bed out of pine (1x, 2x, and 4x), as well as cut some pine crown. I figured a 72T blade should be ok for both tasks. I’m looking to spend around $80. Was also considering the Freud LU91R012, which has a neg. 5 degree hook. My concern with that blade was the thin plate (.071) and kerf (.091).

Thanks again.

View runswithscissors's profile

runswithscissors

2177 posts in 1486 days


#3 posted 02-14-2015 01:41 AM

I’m not sure I see the need for a negative hook blade on a SCMS, where you push the blade through the work. It makes more sense on a RAS, where you pull the blade through, and it wants to climb the work and come at you aggressively. I realize I may just be showing my ignorance here, so maybe somebody can illuminate this.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

View knotscott's profile

knotscott

7209 posts in 2837 days


#4 posted 02-14-2015 04:00 AM

+7° hook is fairly steep, but might be ok….keep it clean and sharp, and let the blade do the cutting. You’ll always hear arguments that it doesn’t matter, but the recommendation is for a low positive to negative hook angle.

A thicker plate width generally means less deflection if all else is equal, but other factors like tensioning, steel quality, balance, relief slots, etc., are also factors.

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

View bigblockyeti's profile

bigblockyeti

3667 posts in 1182 days


#5 posted 02-14-2015 04:12 AM

The thicker plate (assuming similar steel quality) will offer reduced blade deflection. The hook angle from a pure geometry standpoint would be better to be negative. That being said, it’s more about technique and getting used to the tendency of the blade to pull itself into the wood instead of resisting it.

View exelectrician's profile

exelectrician

2327 posts in 1888 days


#6 posted 02-14-2015 07:45 PM

I put DeWalt’s 80 tooth blade on my Makita slider – I was pleasantly surprised at the glass smooth cuts and zero deflection coupled with a really thin kerf. Thin kerf equals less dust and less waste. Double win for me.

-- Love thy neighbour as thyself

View delfonik's profile

delfonik

6 posts in 660 days


#7 posted 02-16-2015 04:46 PM



+7° hook is fairly steep, but might be ok….keep it clean and sharp, and let the blade do the cutting. You ll always hear arguments that it doesn t matter, but the recommendation is for a low positive to negative hook angle.

A thicker plate width generally means less deflection if all else is equal, but other factors like tensioning, steel quality, balance, relief slots, etc., are also factors.

- knotscott

Thank you for the reply, and thanks to everyone else.

I tried to order the Forrest Chopmaster since it was on sale at Acme, but they’re sold out and I need it sooner. I don’t want to pay the Amazon price.

My 2nd choice was the Infinity 012-190. It has a .110 kerf but the plate thickness is only .075, which is not much thicker than the LU91’s .071 plate thickness. The LU91 kerf is .091. Both are neg. 5 hook angles. Since it’s a 12” blade, I don’t want to worry about deflection with the thinner plates. I’ve heard nothing but good things about Infinity, so maybe they use a stronger material that’s less prone to deflection regardless of its thickness.

I’ll take a look at a few others. There’s an Amana A.G.E. 100t, .118 kerf, .098 plate thickness. There’s also an 80t with the same specs, which I’d rather have since I’ll be cutting some 4x and 2x pine for a bed, but it’s sold out.
http://www.amazon.com/Amana-Tool-A-G-E-Series-MD12-106/dp/B000K9P6PK

View knotscott's profile

knotscott

7209 posts in 2837 days


#8 posted 02-16-2015 05:34 PM

You might dig around for a good price on the CMT 219.090.12. Holbren has it for $110 shipped, and will match your best price. Kerf = 0.118, plate = 0.098”. 90T ATB/R (w/chamfered raker).

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

View delfonik's profile

delfonik

6 posts in 660 days


#9 posted 02-18-2015 06:41 PM



You might dig around for a good price on the CMT 219.090.12. Holbren has it for $110 shipped, and will match your best price. Kerf = 0.118, plate = 0.098”. 90T ATB/R (w/chamfered raker).

- knotscott

Thanks for the reply. I ended up getting the 80t Chopmaster from Acme. They’ll be receiving a new shipment at the end of the month, so it will work out for me. Their price was $125 shipped after coupon, so I figured I’d give it a shot.

But I ended up getting a better deal than I originally thought on my DWS782 scms from Home Depot. It was a leftover Black Friday special that they put on clearance last week for $200.04. Also bought a DW745 table saw for $150.04.

Today, they dropped the prices even more, and I got them to do a price adjustment. The DWS782 is now $100.02 and the DW745 is $75.02. So the blade ended up costing more than the saw, lol.

But if anyone is in the market for one of those saws, you should call your local Home Depot. I called mine last week (they’re now sold out) and gave them the SKU number. They had 3 saws left, and sure enough, there were 3 stacked on the top shelf in the tools dept. Same with the table saw.

View bigblockyeti's profile

bigblockyeti

3667 posts in 1182 days


#10 posted 02-19-2015 12:49 AM

That’s a screaming deal for a DW745. Looks like all the BORG around me are out also.

View delfonik's profile

delfonik

6 posts in 660 days


#11 posted 02-19-2015 01:30 AM



That s a screaming deal for a DW745. Looks like all the BORG around me are out also.

- bigblockyeti

Yeah, I lucked out with this one for sure.

I also forgot to mention for anyone that is interested in the saws, the items will not showup online. You’ll have to call the stores with the SKU to check.

View bigblockyeti's profile

bigblockyeti

3667 posts in 1182 days


#12 posted 02-19-2015 01:35 AM

Do you have the SKUs? I called the closest HD to me and they were unable to find a SKU for the table saw.

View delfonik's profile

delfonik

6 posts in 660 days


#13 posted 02-19-2015 01:47 AM

Yup.

DW745 SKU: 136489

DWS782 SKU: 917666

Mine had the exact quantities they told me over the phone in-stock, all on the top shelf in tools. Had to get a man-lift to pull them down. But, I’ve also heard of others whose store told them 0, yet they found one when they looked around.

I wouldn’t go too far out of my way if the store says they’re OOS.

View bigblockyeti's profile

bigblockyeti

3667 posts in 1182 days


#14 posted 02-19-2015 01:54 AM

Thanks, I only wish they had the 10” SCMS on sale for a similar deal.

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