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help calculating angle for spine

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Forum topic by JesseTutt posted 11-13-2012 01:25 AM 653 views 0 times favorited 9 replies Add to Favorites Watch
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JesseTutt

811 posts in 829 days


11-13-2012 01:25 AM

Topic tags/keywords: question geometry spline angle

I have a project with two pieces of wood joining at a 150 degree angle. I would like to glue a spine into one of the pieces and have a snug slot in the other that I can slide the spine into. Latter I can pull the two pieces apart for storage.

I am having a “senior” moment and can’t figure out how to cut the groves for the spine and what angle I should set the table saw blade to. Please help.

I tried setting the blade to 90 degrees (0 degrees) and ran the piece through on the face of the joint.

Here is a diagram of what I want to do:

-- Jesse, Saint Louis, Missouri


9 replies so far

View REO's profile

REO

643 posts in 793 days


#1 posted 11-13-2012 02:01 AM

left tilt saw. fence to the right of the blade. tilt set to fifteen degrees. run the edge cuts for width. stand the board on edge and run the inside face of the board against the fence.

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casual1carpenter

353 posts in 1194 days


#2 posted 11-13-2012 02:50 AM

So REO, would you cut the bevel prior to the spline? I thought I would cut the spline groove first and then the bevel in the hopes of preserving the crisp bevel corner. The spline piece coud then be adjusted to suit the dimensions as built. Same angles just different sequence. Also from drawing it I would not center the spline in a temporary / pull apart joint. The joint looks to lose a lot of cross section material towards the deepest grove and the outside corner.

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JesseTutt

811 posts in 829 days


#3 posted 11-13-2012 02:54 AM

REO, thanks for the reply. Would you explain the logic? I need to convert it to a right tilt saw with the fence on the right.

casual1carpenter, the left piece is 4.5” wide by 8.75 high and the right piece is 8.75 wide by 8.75 high. The joint is solely to hold the two pieces as they sit on their edge.

-- Jesse, Saint Louis, Missouri

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casual1carpenter

353 posts in 1194 days


#4 posted 11-13-2012 03:29 AM

Jesse, did I read somewhere that there was a stock size minimum recommended for table saw safety? Another consideration is how well that short piece and bevel edge is going to track on the table saw. If I read REO right and the inside edge is against the fence the the outside edge (sharper bevel) is opposite side of blade. Is your saw blade insert up to the task of maintaining the bevel cut? You may want to consider doing the bevel and spline work on a single say 18” piece and then split for two pieces. I had a kickback once, took a lucky hit and I still have my fingers so I lucked out but I still try to think about shop and tool safety.

View Mosquito's profile

Mosquito

5022 posts in 1011 days


#5 posted 11-13-2012 03:37 AM

I believe this is what REO was describing, except for a right tilt saw.

You set the blade for 15 degrees, and set the fence for the width/length of the board you want to cut.

Then you move the fence closer, retract the blade enough to cut the spline, and leave the angle as it was when you cut the boards to size, and then with the right tilt saw with fence on right, you would run the long side against the fence.

That would ensure that the spline is at 90 degrees to the face of the bevel. Because the blade stays at a constant angle, and you turn the board 90 degrees.

-- Mos - Twin Cities, MN -- Stanley #45 Evangelist - www.youtube.com/MosquitoMods

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JesseTutt

811 posts in 829 days


#6 posted 11-13-2012 02:08 PM

Thanks guys. I will give it a try today.

Mosquito, thanks for the diagrams. They helped me understand what to do.

-- Jesse, Saint Louis, Missouri

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REO

643 posts in 793 days


#7 posted 11-27-2012 04:47 AM

Haven’t been around to answer the questions sorry. Cutting with the fence tilted to toward the fence is not a good practice. in Mosquitos first picture the fence would be on the left of the fence set for width of the material. second picture the material would be the same orientation but again the fence would be on the left.

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Mosquito

5022 posts in 1011 days


#8 posted 11-27-2012 05:08 AM

I don’t disagree with that REO. I was just giving him images of right tilt with fence on the right, because that’s what he asked about.

-- Mos - Twin Cities, MN -- Stanley #45 Evangelist - www.youtube.com/MosquitoMods

View CalgaryGeoff's profile

CalgaryGeoff

937 posts in 1200 days


#9 posted 12-10-2012 07:04 AM

Thanks for all the good info boys, learned a lot reading.

-- If you believe you can or can not do a thing, you are correct.

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