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Cutting board issue

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Forum topic by Betsy posted 10-22-2010 04:58 AM 975 views 0 times favorited 8 replies Add to Favorites Watch
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Betsy

2914 posts in 2586 days


10-22-2010 04:58 AM

I’m back at these cutting boards. I’ve gone through all the steps outlined in the blog post http://lumberjocks.com/dewoodwork/blog/2597.. Which is a very good read and good instructions and all.

My problem is that apparently I can’t make a 3/4” square completely square. :-(

the issue is my measuring tools. I have a good square that I use and a good electronic caliper. However, apparently while the calipers are good for most things – they are not as accurate as I thought they were. So while I genuinely thought I had 3/4 exactly – alas—- I did not.

So here’s the question—- what brand of dial calipers do you all use? I obviously need a better set since if you don’t get your material exactly square for this project your lines will be off big time.

Any and all suggestions are welcome. (Just a caveat—- I won’t be back on line for several days—- but please reply and I’ll respond when I get back.)

Thanks in advance.

-- Like a bad penny, I keep coming back!


8 replies so far

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lew

10094 posts in 2445 days


#1 posted 10-22-2010 05:30 AM

Betsy,
My digital caliper is from Rockler.

Lew

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

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fredf

495 posts in 2400 days


#2 posted 10-24-2010 08:03 AM

Betsy

Are you doing ALL of each step at a time or are you doing piecemeal? IE mill ALL stock to same thickness by running each piece through the planer, adjusting the planer doing the other side of each piece, so you are only adjusting to 3/4” ONCE for the complete batch of raw stock

Then after gluing up ALL the rows. Running them through the same way so you are only adjusting the planer to 3/4 ONE time for the glued up strips?

Even if the squares are NOT square, they should line up doing this way as each and every one is the same thickness in the horizontal direction and each is the same in the vertical direction; even tho the horizontal may not equal the vertical, every thing should line up fine. the trick is doing ALL of each operation AT ONCE. it is extremely difficult to set planer twice to the exact same thickness. if you are off by 1/1000 you will be off 17/1000 after 17 blocks. even 1/10000 could be noticeable after that many blocks

fred

-- Fred, Springfield, Ma

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TopamaxSurvivor

14874 posts in 2366 days


#3 posted 10-24-2010 08:28 AM

Betsy, Need to fix the link when you get back. I use quite a variety of measuring instruments. My vernier and dial calipers and micrometer are Craftsman. I have some Starret stuff too. Then there is my rough use stuff, but you don’t care about that ;-))

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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TopamaxSurvivor

14874 posts in 2366 days


#4 posted 10-24-2010 08:30 AM

Oops, forgot to mention, I don’t care for digital calipers measuring in thousanths. With vernier or dial, you can see if it is off and by how much.

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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Vjeko

128 posts in 2105 days


#5 posted 10-24-2010 09:20 AM

Betsy,
I don’t believe your problem is in the calipers/other instruments you use – as fredf mentioned, it’s
to do with making one setup and running everything according to that. The same goes with your cutting / how square you have everything setup. I would recheck / finetune your tools and decide on one measurement and run everything through without changes.

-- Vjeko Balas - Croatia

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Betsy

2914 posts in 2586 days


#6 posted 10-25-2010 05:35 AM

Thanks guys. Fred – I do run everything at one time. I’m one of those folks that won’t run the first piece if I’m not sure I’ll get be able to finish the last piece. Vjeko—- I am going to recheck all my setups again to be sure.

I also did buy a dial caliper this weekend. My dial calipers do not match my digital caliper readouts. It was off quite a lot. My digital calipers says the 3/4 is exact on one side and is off just a tiny hair on the other. The dial calipers says they are both off different amounts.

I’m going to do a through review of my setups, tune ups, etc. and then give this another go.

I did go ahead and glue up the boards despite that fact that they will not be lined up to my satisfaction. I figure I’ll use one board and the other two I can give to friends who don’t mind a little offness, but would still enjoy a solid cutting board.

Thanks for your help guys.

-- Like a bad penny, I keep coming back!

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TopamaxSurvivor

14874 posts in 2366 days


#7 posted 10-25-2010 05:39 AM

You can zero your dial calipers by loosening the screw and setting it to “zero” if it isn’t there already.

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View fredf's profile

fredf

495 posts in 2400 days


#8 posted 10-25-2010 05:47 AM

“3/4 is exact on one side and is off just a tiny hair on the other. “

Do you mean one edge of board is thicker than the other??? there be your problem I bet!!!

fred

-- Fred, Springfield, Ma

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