dmjones
I am cutting the 5 truck fleet on my scroll saw using yellow pine. Does anyone know what a good blade is to use? I am finding this wood hard to cut. I managed to cut this one with a #5 blade. 20170908_180011.jpg 
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BadBob
Yellow pine is tough to cut smoothly with any blade. I use a #7 skip tooth for cutting 2x stock but even that would be hard to do with yellow pine.  I made a rocking horse for yellow pine that I cut with a bandsaw and it was hard to do. The combination of very hard and very soft grain can cause the saw blade to jump and wander a bit. Cut very slow and careful and used a new/sharp blade. 
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Doc
I use a #7 or a #9 skip tooth with good results and no sanding required.

As Bob says, the trick is to cut slow but sure keeping an eye on any wondering. You may need to change the blade often depending on how many articles you are cutting.

As a rule of thumb, I start every project bigger than a few small vehicles with a brand new blade, just to ensure a decent cut. Means less sanding and a quicker turnover.

Hope this helps.
Regards
Doc
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