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Is there any harm in sanding before cutting?

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Forum topic by Curti8877 posted 04-01-2020 11:26 PM 1223 views 0 times favorited 41 replies Add to Favorites Watch
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Curti8877

3 posts in 64 days


04-01-2020 11:26 PM

I have heard that sanding before cutting to final size may dull blades. Is there any truth to that?


41 replies so far

View Aj2's profile

Aj2

2974 posts in 2537 days


#1 posted 04-02-2020 12:27 AM

Yes

-- Aj

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Kelly

2960 posts in 3684 days


#2 posted 04-02-2020 01:27 AM

About as much as shifting from cutting poplar to cutting maple, or not. Anyway, over fifty in and that would be a new one to me. Failing to wipe down the wood and leaving 80 grit boulders on the wood aside, my suspicious is, if sanding beat my blades up enough to notice, I should shop for them at someplace other than Walmart.

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Aj2

2974 posts in 2537 days


#3 posted 04-02-2020 01:32 AM

I would like to change my answer to No.
Can someone record my change in the book of life.:)

-- Aj

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Kelly

2960 posts in 3684 days


#4 posted 04-02-2020 02:14 AM

I took care of it. You’re covered.


I would like to change my answer to No.
Can someone record my change in the book of life.:)

- Aj2

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Aj2

2974 posts in 2537 days


#5 posted 04-02-2020 02:34 AM

Appreciate it.

-- Aj

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LittleBlackDuck

4517 posts in 1560 days


#6 posted 04-02-2020 11:32 AM

No idea behind the science on the blade wear, however, why sand first when the chances are you will sand after…
Correction… remove chances from the above.

Personally you should have stuck to your guns Aj.

-- If your first cut is too short... Take the second cut from the longer end... LBD

View LeeRoyMan's profile

LeeRoyMan

1090 posts in 466 days


#7 posted 04-02-2020 01:53 PM



No idea behind the science on the blade wear, however, why sand first when the chances are you will sand after…
Correction… remove chances from the above.

- LittleBlackDuck


There have been quite a few times I have cut many small parts out of a sheet of wood. It’s way faster to flat sand the sheet all at once, then cut it into the smaller parts, compared to cutting it and sanding each piece individually.
As always with everything, it depends on what you’re doing and it is just one of the options you weigh out before doing.

I’ve never heard or even figured that sanding first would dull a blade. It’s a myth to me.

-- I only know what I know, nothing less, nothing more -- That doesn't count what I used to know..

View splintergroup's profile

splintergroup

3681 posts in 1962 days


#8 posted 04-02-2020 04:21 PM

I’ll sand to almost-final-grit first just to get all the linear DS scratches out, blow the dust off with compressed air, then cut to size. This eliminates any rounded edges and other issues. Since cutting on the TS tends to leave the occasional scuff marks, the final grit is done afterwards. Besides, this leaves me with a cutoff scrap box full of sanded bits 8^)

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pottz

9526 posts in 1724 days


#9 posted 04-02-2020 04:24 PM

where did you hear that? a new one to me.

-- sawdust the bigger the pile the bigger my smile-larry,so cal.

View Curti8877's profile

Curti8877

3 posts in 64 days


#10 posted 04-02-2020 04:31 PM

This was brought up in another forum. It was specifically brought up when one member stated that he uses a large belt sander to sand to 180 before cutting. No one in that forum had any good evidence that this does happen, and most were as dumbfounded as we all are.

Just another case of “Fake News”.

View EarlS's profile

EarlS

3679 posts in 3088 days


#11 posted 04-02-2020 04:59 PM

+1 spintergroup

Consider that the saw blade is cutting through the wood and sanding is only on the upper/lower faces of the board.

BTW – OP is a bit confusing: not sure how “Sanding before finishing” causes “dull blades”? Typo maybe?


I have heard that sanding before finishing may dull blades. Is there any truth to that?

- Curti8877


-- Earl "I'm a pessamist - generally that increases the chance that things will turn out better than expected"

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Aj2

2974 posts in 2537 days


#12 posted 04-02-2020 05:04 PM

I’ve had the lovely experience try to handplanes Alder after it’s been sanded. It’s not something I do very often but sometimes it’s just works out that way.
The grit from sandpaper will drop down into the pores making it nearly impossible to handplane.
But I don’t call it finishing. The op said “finishing” to me that means the end of all cutting.
The key to happiness is no sandpaper.

Good Luck

-- Aj

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Curti8877

3 posts in 64 days


#13 posted 04-02-2020 05:20 PM

What I meant to say was sanding before cutting to final size.

View LittleBlackDuck's profile

LittleBlackDuck

4517 posts in 1560 days


#14 posted 04-02-2020 06:39 PM

Let us make the assumption that the 22carrat diamond dust that flakes of your abrasives will only damage your wallet and not your blade.

Sanding prior can be part of standard timber preparation as required... like basic milling prior to cutting after initial milling (dio we detect a loop)... The optimum level of prep can be governed by far too many variables to list, however, one of the key contributers could be the type of timber for example.
I often use pine for many reasons; avail ability, cost, availability, weight, availability and can look quite impressive with some interesting grain and knot patterns… and I should mention availability.
When I run a plank across my tabletop and if I don’t clean it of (which I always don’t as I’m just too bloody slack), even a small ant turd will leave a furrow in that pine that may need me to drop back a few grits after the cut to clean it up…
Another major variable is the size you are sawing… I for one would not spend too much time sanding if I’m gonna rip a 1 fool board in half…
Assembly… how many times do you sand, assemble, sand some more and finally take it to the tablesaw???

I think the bottom line is horses for courses.

Probably the only solid conclusion we can all agree on is that we must do some sanding after sawing”, unless you used a tablesaw pimped out with one of those Nakaya Ryoba* left handed Jap saws.

-- If your first cut is too short... Take the second cut from the longer end... LBD

View AlaskaGuy's profile

AlaskaGuy

5734 posts in 3049 days


#15 posted 04-02-2020 07:00 PM



I would like to change my answer to No.
Can someone record my change in the book of life.:)

- Aj2


It’s not that easy. Only women have a right to change their minds. :)

-- Alaskan's for Global warming!

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