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convexed miter cuts ?

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Forum topic by eddy posted 12-13-2009 07:12 PM 996 views 0 times favorited 9 replies Add to Favorites Watch
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eddy

936 posts in 2830 days


12-13-2009 07:12 PM

i was making some more boxes yesterday using the same sled i have been using for all my miter cuts.
when i layed the pieces on the bench to start taping them i saw most of the cuts were convex is shape
as much as a 1/16 gap at each end. cked the fence was still square to the blade ? i had to recut 6 of the 10 boards with very small cuts to clean them up ? i have a left tilt saw and i am cutting from the right side.
the sled fits tight in the miter slots i have the blade about 3/8 inch above the work piece the blade is a 50 tooth combo. freud. the box sides are .300 thick. this hasent happened before so i am puzzled

-- self proclaimed copycat


9 replies so far

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Bothus

439 posts in 2642 days


#1 posted 12-13-2009 07:22 PM

Can you post photos?

I think I understand the cut you are making but I’m not sure.

Photos would help, but this is a strange one.

Bothus

-- Jerry Boshear, Professional Kitchen Designer, amature woodworker.

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eddy

936 posts in 2830 days


#2 posted 12-13-2009 07:37 PM

sorry no photos i recut all the boards yesterday i need these done by this week
the cuts are 45 deg. cuts to make the sides of the boxes when looking down at them (board flat on the bench the center of he cut is higher than the sides so it looks rounded lower on the 2 outer sides

-- self proclaimed copycat

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GFYS

711 posts in 2937 days


#3 posted 12-13-2009 08:09 PM

sounds like the material isn’t flat to me.

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cabinetmaster

10874 posts in 3024 days


#4 posted 12-13-2009 08:19 PM

Yea. Sounds like the board may have a very slight cup to it.

-- Jerry--A man can never have enough tools or clamps

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Bothus

439 posts in 2642 days


#5 posted 12-14-2009 01:49 AM

Thanks Eddy, now I understand but I can’t figure out what could have happened that you wouldn’t have noticed.

If the parts moved when you were cutting them, you would have noticed.

If the boards were warped or cupped you would have noticed.

Maybe the tree wasn’t dead yet and decided to grow a little when you weren’t looking.

Glad you got it fixed though. Don’t forget to post pictures of the finished boxes.

Take care,

Bothus

-- Jerry Boshear, Professional Kitchen Designer, amature woodworker.

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eddy

936 posts in 2830 days


#6 posted 12-14-2009 05:10 AM

Jerry, dan,bothus when you say a very slight cup do you mean less than .010 ?
i did ck all my glue ups after planing but that was 3 days ago started cuting yesterday felt flat but didnot ck again. was trying to make up for 3 days the temp here has been going for a low of 30 deg.f to 65 in the middle of the day and we have had some rain so i wonder if i am fighting a humidity issue. shop is very cold when i get there i fire up the hearter when i get started

-- self proclaimed copycat

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GFYS

711 posts in 2937 days


#7 posted 12-14-2009 06:48 AM

yes a 10th of an inch is alot of warp.. depending on the length or width. Certainly enough warp or cup to cause the gap you are seeing.

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a1Jim

115202 posts in 3043 days


#8 posted 12-14-2009 07:31 AM

Sounds like the wood moved. did you leave one side Flatt on a bench over night ? If so you let one side dry and the other side couldn’t dry as fast. even more prevalent when you don’t let you wood acclimate after rough cutting.

-- http://artisticwoodstudio.com Custom furniture

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eddy

936 posts in 2830 days


#9 posted 12-14-2009 03:59 PM

i see said the blind man.
that is exactly what i did jim, i did the first glue up 3/4 by 6 by 29 long let sit over night
cleaned it up next day and resawed cleaned that up with a pass thru the planer and set it on the bench
then i was not able to get back out to the shop for 3 days. so the 2 pieces of wood sat flat on the bench for
all that time and cupped slightly looking at the cuts i had to redo the boards cupped at the ends only
thanks jim i would never figured that out myself sounds like i made a rookie mistake.
today is going to be a good day i learned something new

-- self proclaimed copycat

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